git@vger.kernel.org list mirror (unofficial, one of many)
 help / color / mirror / code / Atom feed
* [PATCH v5 00/44] Make git-am a builtin
@ 2015-07-07 14:20 Paul Tan
  2015-07-07 14:20 ` [PATCH v5 01/44] wrapper: implement xopen() Paul Tan
                   ` (46 more replies)
  0 siblings, 47 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

This patch series depends on pt/pull-builtin.

This is a re-roll of [v4]. Thanks Torsten, Stefan, Junio for the reviews last
round. Interdiff below.

Previous versions:

[WIP v1] http://thread.gmane.org/gmane.comp.version-control.git/270048
[WIP v2] http://thread.gmane.org/gmane.comp.version-control.git/271381
[WIP v3] http://thread.gmane.org/gmane.comp.version-control.git/271967
[v4] http://thread.gmane.org/gmane.comp.version-control.git/272876

git-am is a commonly used command for applying a series of patches from a
mailbox to the current branch. Currently, it is implemented by the shell script
git-am.sh. However, compared to C, shell scripts have certain deficiencies:
they need to spawn a lot of processes, introduce a lot of dependencies and
cannot take advantage of git's internal caches.

This patch series rewrites git-am.sh into optimized C builtin/am.c, and is
part of my GSoC project to rewrite git-pull and git-am into C builtins[1].

[1] https://gist.github.com/pyokagan/1b7b0d1f4dab6ba3cef1


Paul Tan (44):
  wrapper: implement xopen()
  wrapper: implement xfopen()
  builtin-am: implement skeletal builtin am
  builtin-am: implement patch queue mechanism
  builtin-am: split out mbox/maildir patches with git-mailsplit
  builtin-am: auto-detect mbox patches
  builtin-am: extract patch and commit info with git-mailinfo
  builtin-am: apply patch with git-apply
  builtin-am: implement committing applied patch
  builtin-am: refuse to apply patches if index is dirty
  builtin-am: implement --resolved/--continue
  builtin-am: implement --skip
  builtin-am: implement --abort
  builtin-am: reject patches when there's a session in progress
  builtin-am: implement -q/--quiet
  builtin-am: exit with user friendly message on failure
  builtin-am: implement -s/--signoff
  cache-tree: introduce write_index_as_tree()
  builtin-am: implement --3way, am.threeWay
  builtin-am: implement --rebasing mode
  builtin-am: bypass git-mailinfo when --rebasing
  builtin-am: handle stray state directory
  builtin-am: implement -u/--utf8
  builtin-am: implement -k/--keep, --keep-non-patch
  builtin-am: implement --[no-]message-id, am.messageid
  builtin-am: support --keep-cr, am.keepcr
  builtin-am: implement --[no-]scissors
  builtin-am: pass git-apply's options to git-apply
  builtin-am: implement --ignore-date
  builtin-am: implement --committer-date-is-author-date
  builtin-am: implement -S/--gpg-sign, commit.gpgsign
  builtin-am: invoke post-rewrite hook
  builtin-am: support automatic notes copying
  builtin-am: invoke applypatch-msg hook
  builtin-am: invoke pre-applypatch hook
  builtin-am: invoke post-applypatch hook
  builtin-am: rerere support
  builtin-am: support and auto-detect StGit patches
  builtin-am: support and auto-detect StGit series files
  builtin-am: support and auto-detect mercurial patches
  builtin-am: implement -i/--interactive
  builtin-am: implement legacy -b/--binary option
  builtin-am: check for valid committer ident
  builtin-am: remove redirection to git-am.sh

 Makefile                                |    2 +-
 builtin.h                               |    1 +
 builtin/am.c                            | 2331 +++++++++++++++++++++++++++++++
 cache-tree.c                            |   29 +-
 cache-tree.h                            |    1 +
 git-am.sh => contrib/examples/git-am.sh |    0
 git-compat-util.h                       |    2 +
 git.c                                   |    1 +
 wrapper.c                               |   56 +
 9 files changed, 2410 insertions(+), 13 deletions(-)
 create mode 100644 builtin/am.c
 rename git-am.sh => contrib/examples/git-am.sh (100%)

diff --git a/builtin/am.c b/builtin/am.c
index fb91145..c548129 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -71,8 +71,8 @@ static int linelen(const char *msg)
  */
 static int str_isspace(const char *str)
 {
-	while (*str)
-		if (!isspace(*(str)++))
+	for (; *str; str++)
+		if (!isspace(*str))
 			return 0;
 
 	return 1;
@@ -94,8 +94,8 @@ enum keep_type {
 
 enum scissors_type {
 	SCISSORS_UNSET = -1,
-	SCISSORS_TRUE,  /* pass --scissors to git-mailinfo */
-	SCISSORS_FALSE  /* pass --no-scissors to git-mailinfo */
+	SCISSORS_FALSE = 0,  /* pass --no-scissors to git-mailinfo */
+	SCISSORS_TRUE        /* pass --scissors to git-mailinfo */
 };
 
 struct am_state {
@@ -160,8 +160,7 @@ struct am_state {
  */
 static void am_state_init(struct am_state *state, const char *dir)
 {
-	const char *quiet;
-	int sign_commit;
+	int gpgsign;
 
 	memset(state, 0, sizeof(*state));
 
@@ -172,10 +171,6 @@ static void am_state_init(struct am_state *state, const char *dir)
 
 	git_config_get_bool("am.threeway", &state->threeway);
 
-	quiet = getenv("GIT_QUIET");
-	if (quiet && *quiet)
-		state->quiet = 1;
-
 	state->utf8 = 1;
 
 	git_config_get_bool("am.messageid", &state->message_id);
@@ -184,8 +179,8 @@ static void am_state_init(struct am_state *state, const char *dir)
 
 	argv_array_init(&state->git_apply_opts);
 
-	if (!git_config_get_bool("commit.gpgsign", &sign_commit))
-		state->sign_commit = sign_commit ? "" : NULL;
+	if (!git_config_get_bool("commit.gpgsign", &gpgsign))
+		state->sign_commit = gpgsign ? "" : NULL;
 }
 
 /**
@@ -918,7 +913,7 @@ static int hg_patch_to_mail(FILE *out, FILE *in, int keep_cr)
 			fprintf(out, "From: %s\n", str);
 		else if (skip_prefix(sb.buf, "# Date ", &str)) {
 			unsigned long timestamp;
-			long tz;
+			long tz, tz2;
 			char *end;
 
 			errno = 0;
@@ -942,10 +937,11 @@ static int hg_patch_to_mail(FILE *out, FILE *in, int keep_cr)
 			 * however git's timezone is in hours + minutes east of
 			 * UTC. Convert it.
 			 */
-			tz = tz / (60 * 60) * 100 + tz % (60 * 60);
-			tz = -tz;
+			tz2 = labs(tz) / 3600 * 100 + labs(tz) % 3600 / 60;
+			if (tz > 0)
+				tz2 = -tz2;
 
-			fprintf(out, "Date: %s\n", show_date(timestamp, tz, DATE_RFC2822));
+			fprintf(out, "Date: %s\n", show_date(timestamp, tz2, DATE_RFC2822));
 		} else if (starts_with(sb.buf, "# ")) {
 			continue;
 		} else {
@@ -1555,7 +1551,7 @@ static int run_apply(const struct am_state *state, const char *index_file)
 }
 
 /**
- * Builds a index that contains just the blobs needed for a 3way merge.
+ * Builds an index that contains just the blobs needed for a 3way merge.
  */
 static int build_fake_ancestor(const struct am_state *state, const char *index_file)
 {
diff --git a/wrapper.c b/wrapper.c
index f127eb3..e451463 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -197,20 +197,30 @@ int xopen(const char *path, int oflag, ...)
 	mode_t mode = 0;
 	va_list ap;
 
+	/*
+	 * va_arg() will have undefined behavior if the specified type is not
+	 * compatible with the argument type. Since integers are promoted to
+	 * ints, we fetch the next argument as an int, and then cast it to a
+	 * mode_t to avoid undefined behavior.
+	 */
 	va_start(ap, oflag);
 	if (oflag & O_CREAT)
-		mode = va_arg(ap, mode_t);
+		mode = va_arg(ap, int);
 	va_end(ap);
 
-	assert(path);
-
 	for (;;) {
 		int fd = open(path, oflag, mode);
 		if (fd >= 0)
 			return fd;
 		if (errno == EINTR)
 			continue;
-		die_errno(_("could not open '%s'"), path);
+
+		if ((oflag & O_RDWR) == O_RDWR)
+			die_errno(_("could not open '%s' for reading and writing"), path);
+		else if ((oflag & O_WRONLY) == O_WRONLY)
+			die_errno(_("could not open '%s' for writing"), path);
+		else
+			die_errno(_("could not open '%s' for reading"), path);
 	}
 }
 
@@ -341,16 +351,19 @@ int xdup(int fd)
  */
 FILE *xfopen(const char *path, const char *mode)
 {
-	assert(path);
-	assert(mode);
-
 	for (;;) {
 		FILE *fp = fopen(path, mode);
 		if (fp)
 			return fp;
 		if (errno == EINTR)
 			continue;
-		die_errno(_("could not open '%s'"), path);
+
+		if (*mode && mode[1] == '+')
+			die_errno(_("could not open '%s' for reading and writing"), path);
+		else if (*mode == 'w' || *mode == 'a')
+			die_errno(_("could not open '%s' for writing"), path);
+		else
+			die_errno(_("could not open '%s' for reading"), path);
 	}
 }
 

-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 01/44] wrapper: implement xopen()
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 02/44] wrapper: implement xfopen() Paul Tan
                   ` (45 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

A common usage pattern of open() is to check if it was successful, and
die() if it was not:

	int fd = open(path, O_WRONLY | O_CREAT, 0777);
	if (fd < 0)
		die_errno(_("Could not open '%s' for writing."), path);

Implement a wrapper function xopen() that does the above so that we can
save a few lines of code, and make the die() messages consistent.

Helped-by: Torsten Bögershausen <tboegi@web.de>
Helped-by: Jeff King <peff@peff.net>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * Remove assert()s since we do not need to over-zealously check against
      insane code.
    
    * Use va_arg(va, int) instead of va_arg(va, mode_t) to guard against
      undefined behavior if mode_t is incompatible with the promoted integer
      argument (int).
    
    * The read/write error messages have returned as they can be used to
      better diagnose permission errors. Hopefully I got the logic right
      this time.

 git-compat-util.h |  1 +
 wrapper.c         | 35 +++++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/git-compat-util.h b/git-compat-util.h
index c6d391f..e168dfd 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -717,6 +717,7 @@ extern void *xrealloc(void *ptr, size_t size);
 extern void *xcalloc(size_t nmemb, size_t size);
 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
+extern int xopen(const char *path, int flags, ...);
 extern ssize_t xread(int fd, void *buf, size_t len);
 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
diff --git a/wrapper.c b/wrapper.c
index ff49807..0a4502d 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -189,6 +189,41 @@ void *xcalloc(size_t nmemb, size_t size)
 # endif
 #endif
 
+/**
+ * xopen() is the same as open(), but it die()s if the open() fails.
+ */
+int xopen(const char *path, int oflag, ...)
+{
+	mode_t mode = 0;
+	va_list ap;
+
+	/*
+	 * va_arg() will have undefined behavior if the specified type is not
+	 * compatible with the argument type. Since integers are promoted to
+	 * ints, we fetch the next argument as an int, and then cast it to a
+	 * mode_t to avoid undefined behavior.
+	 */
+	va_start(ap, oflag);
+	if (oflag & O_CREAT)
+		mode = va_arg(ap, int);
+	va_end(ap);
+
+	for (;;) {
+		int fd = open(path, oflag, mode);
+		if (fd >= 0)
+			return fd;
+		if (errno == EINTR)
+			continue;
+
+		if ((oflag & O_RDWR) == O_RDWR)
+			die_errno(_("could not open '%s' for reading and writing"), path);
+		else if ((oflag & O_WRONLY) == O_WRONLY)
+			die_errno(_("could not open '%s' for writing"), path);
+		else
+			die_errno(_("could not open '%s' for reading"), path);
+	}
+}
+
 /*
  * xread() is the same a read(), but it automatically restarts read()
  * operations with a recoverable error (EAGAIN and EINTR). xread()
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 02/44] wrapper: implement xfopen()
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
  2015-07-07 14:20 ` [PATCH v5 01/44] wrapper: implement xopen() Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 03/44] builtin-am: implement skeletal builtin am Paul Tan
                   ` (44 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

A common usage pattern of fopen() is to check if it succeeded, and die()
if it failed:

	FILE *fp = fopen(path, "w");
	if (!fp)
		die_errno(_("could not open '%s' for writing"), path);

Implement a wrapper function xfopen() for the above, so that we can save
a few lines of code and make the die() messages consistent.

Helped-by: Jeff King <peff@peff.net>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * Removed assert()s since we do not need to over-zealously guard against
      insane code.
    
    * The read/write error messages have returned as they are useful in
      diagnosing permission errors. Hopefully I got the logic right this
      time.

 git-compat-util.h |  1 +
 wrapper.c         | 21 +++++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/git-compat-util.h b/git-compat-util.h
index e168dfd..392da79 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -722,6 +722,7 @@ extern ssize_t xread(int fd, void *buf, size_t len);
 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 extern int xdup(int fd);
+extern FILE *xfopen(const char *path, const char *mode);
 extern FILE *xfdopen(int fd, const char *mode);
 extern int xmkstemp(char *template);
 extern int xmkstemp_mode(char *template, int mode);
diff --git a/wrapper.c b/wrapper.c
index 0a4502d..e451463 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -346,6 +346,27 @@ int xdup(int fd)
 	return ret;
 }
 
+/**
+ * xfopen() is the same as fopen(), but it die()s if the fopen() fails.
+ */
+FILE *xfopen(const char *path, const char *mode)
+{
+	for (;;) {
+		FILE *fp = fopen(path, mode);
+		if (fp)
+			return fp;
+		if (errno == EINTR)
+			continue;
+
+		if (*mode && mode[1] == '+')
+			die_errno(_("could not open '%s' for reading and writing"), path);
+		else if (*mode == 'w' || *mode == 'a')
+			die_errno(_("could not open '%s' for writing"), path);
+		else
+			die_errno(_("could not open '%s' for reading"), path);
+	}
+}
+
 FILE *xfdopen(int fd, const char *mode)
 {
 	FILE *stream = fdopen(fd, mode);
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 03/44] builtin-am: implement skeletal builtin am
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
  2015-07-07 14:20 ` [PATCH v5 01/44] wrapper: implement xopen() Paul Tan
  2015-07-07 14:20 ` [PATCH v5 02/44] wrapper: implement xfopen() Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 04/44] builtin-am: implement patch queue mechanism Paul Tan
                   ` (43 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

For the purpose of rewriting git-am.sh into a C builtin, implement a
skeletal builtin/am.c that redirects to $GIT_EXEC_PATH/git-am if the
environment variable _GIT_USE_BUILTIN_AM is not defined. Since in the
Makefile git-am.sh takes precedence over builtin/am.c,
$GIT_EXEC_PATH/git-am will contain the shell script git-am.sh, and thus
this allows us to fall back on the functional git-am.sh when running the
test suite for tests that depend on a working git-am implementation.

Since git-am.sh cannot handle any environment modifications by
setup_git_directory(), "am" is declared with no setup flags in git.c. On
the other hand, to re-implement git-am.sh in builtin/am.c, we need to
run all the git dir and work tree setup logic that git.c typically does
for us. As such, we work around this temporarily by copying the logic in
git.c's run_builtin(), which is roughly:

	prefix = setup_git_directory();
	trace_repo_setup(prefix);
	setup_work_tree();

This redirection should be removed when all the features of git-am.sh
have been re-implemented in builtin/am.c.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 Makefile     |  1 +
 builtin.h    |  1 +
 builtin/am.c | 29 +++++++++++++++++++++++++++++
 git.c        |  6 ++++++
 4 files changed, 37 insertions(+)
 create mode 100644 builtin/am.c

diff --git a/Makefile b/Makefile
index 93e4fa2..ff9bdc0 100644
--- a/Makefile
+++ b/Makefile
@@ -811,6 +811,7 @@ LIB_OBJS += xdiff-interface.o
 LIB_OBJS += zlib.o
 
 BUILTIN_OBJS += builtin/add.o
+BUILTIN_OBJS += builtin/am.o
 BUILTIN_OBJS += builtin/annotate.o
 BUILTIN_OBJS += builtin/apply.o
 BUILTIN_OBJS += builtin/archive.o
diff --git a/builtin.h b/builtin.h
index ea3c834..f30cf00 100644
--- a/builtin.h
+++ b/builtin.h
@@ -30,6 +30,7 @@ extern int textconv_object(const char *path, unsigned mode, const unsigned char
 extern int is_builtin(const char *s);
 
 extern int cmd_add(int argc, const char **argv, const char *prefix);
+extern int cmd_am(int argc, const char **argv, const char *prefix);
 extern int cmd_annotate(int argc, const char **argv, const char *prefix);
 extern int cmd_apply(int argc, const char **argv, const char *prefix);
 extern int cmd_archive(int argc, const char **argv, const char *prefix);
diff --git a/builtin/am.c b/builtin/am.c
new file mode 100644
index 0000000..fd32caf
--- /dev/null
+++ b/builtin/am.c
@@ -0,0 +1,29 @@
+/*
+ * Builtin "git am"
+ *
+ * Based on git-am.sh by Junio C Hamano.
+ */
+#include "cache.h"
+#include "builtin.h"
+#include "exec_cmd.h"
+
+int cmd_am(int argc, const char **argv, const char *prefix)
+{
+
+	/*
+	 * NEEDSWORK: Once all the features of git-am.sh have been
+	 * re-implemented in builtin/am.c, this preamble can be removed.
+	 */
+	if (!getenv("_GIT_USE_BUILTIN_AM")) {
+		const char *path = mkpath("%s/git-am", git_exec_path());
+
+		if (sane_execvp(path, (char **)argv) < 0)
+			die_errno("could not exec %s", path);
+	} else {
+		prefix = setup_git_directory();
+		trace_repo_setup(prefix);
+		setup_work_tree();
+	}
+
+	return 0;
+}
diff --git a/git.c b/git.c
index e7a7713..e84e1a1 100644
--- a/git.c
+++ b/git.c
@@ -370,6 +370,12 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 static struct cmd_struct commands[] = {
 	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
+	/*
+	 * NEEDSWORK: Once the redirection to git-am.sh in builtin/am.c has
+	 * been removed, this entry should be changed to
+	 * RUN_SETUP | NEED_WORK_TREE
+	 */
+	{ "am", cmd_am },
 	{ "annotate", cmd_annotate, RUN_SETUP },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
 	{ "archive", cmd_archive },
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 04/44] builtin-am: implement patch queue mechanism
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (2 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 03/44] builtin-am: implement skeletal builtin am Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 05/44] builtin-am: split out mbox/maildir patches with git-mailsplit Paul Tan
                   ` (42 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

git-am applies a series of patches. If the process terminates
abnormally, we want to be able to resume applying the series of patches.
This requires the session state to be saved in a persistent location.

Implement the mechanism of a "patch queue", represented by 2 integers --
the index of the current patch we are applying and the index of the last
patch, as well as its lifecycle through the following functions:

* am_setup(), which will set up the state directory
  $GIT_DIR/rebase-apply. As such, even if the process exits abnormally,
  the last-known state will still persist.

* am_load(), which is called if there is an am session in
  progress, to load the last known state from the state directory so we
  can resume applying patches.

* am_run(), which will do the actual patch application. After applying a
  patch, it calls am_next() to increment the current patch index. The
  logic for applying and committing a patch is not implemented yet.

* am_destroy(), which is finally called when we successfully applied all
  the patches in the queue, to clean up by removing the state directory
  and its contents.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Stefan Beller <sbeller@google.com>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 180 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 180 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index fd32caf..292f793 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -6,9 +6,174 @@
 #include "cache.h"
 #include "builtin.h"
 #include "exec_cmd.h"
+#include "parse-options.h"
+#include "dir.h"
+
+struct am_state {
+	/* state directory path */
+	char *dir;
+
+	/* current and last patch numbers, 1-indexed */
+	int cur;
+	int last;
+};
+
+/**
+ * Initializes am_state with the default values. The state directory is set to
+ * dir.
+ */
+static void am_state_init(struct am_state *state, const char *dir)
+{
+	memset(state, 0, sizeof(*state));
+
+	assert(dir);
+	state->dir = xstrdup(dir);
+}
+
+/**
+ * Releases memory allocated by an am_state.
+ */
+static void am_state_release(struct am_state *state)
+{
+	if (state->dir)
+		free(state->dir);
+}
+
+/**
+ * Returns path relative to the am_state directory.
+ */
+static inline const char *am_path(const struct am_state *state, const char *path)
+{
+	assert(state->dir);
+	assert(path);
+	return mkpath("%s/%s", state->dir, path);
+}
+
+/**
+ * Returns 1 if there is an am session in progress, 0 otherwise.
+ */
+static int am_in_progress(const struct am_state *state)
+{
+	struct stat st;
+
+	if (lstat(state->dir, &st) < 0 || !S_ISDIR(st.st_mode))
+		return 0;
+	if (lstat(am_path(state, "last"), &st) || !S_ISREG(st.st_mode))
+		return 0;
+	if (lstat(am_path(state, "next"), &st) || !S_ISREG(st.st_mode))
+		return 0;
+	return 1;
+}
+
+/**
+ * Reads the contents of `file` in the `state` directory into `sb`. Returns the
+ * number of bytes read on success, -1 if the file does not exist. If `trim` is
+ * set, trailing whitespace will be removed.
+ */
+static int read_state_file(struct strbuf *sb, const struct am_state *state,
+			const char *file, int trim)
+{
+	strbuf_reset(sb);
+
+	if (strbuf_read_file(sb, am_path(state, file), 0) >= 0) {
+		if (trim)
+			strbuf_trim(sb);
+
+		return sb->len;
+	}
+
+	if (errno == ENOENT)
+		return -1;
+
+	die_errno(_("could not read '%s'"), am_path(state, file));
+}
+
+/**
+ * Loads state from disk.
+ */
+static void am_load(struct am_state *state)
+{
+	struct strbuf sb = STRBUF_INIT;
+
+	if (read_state_file(&sb, state, "next", 1) < 0)
+		die("BUG: state file 'next' does not exist");
+	state->cur = strtol(sb.buf, NULL, 10);
+
+	if (read_state_file(&sb, state, "last", 1) < 0)
+		die("BUG: state file 'last' does not exist");
+	state->last = strtol(sb.buf, NULL, 10);
+
+	strbuf_release(&sb);
+}
+
+/**
+ * Removes the am_state directory, forcefully terminating the current am
+ * session.
+ */
+static void am_destroy(const struct am_state *state)
+{
+	struct strbuf sb = STRBUF_INIT;
+
+	strbuf_addstr(&sb, state->dir);
+	remove_dir_recursively(&sb, 0);
+	strbuf_release(&sb);
+}
+
+/**
+ * Setup a new am session for applying patches
+ */
+static void am_setup(struct am_state *state)
+{
+	if (mkdir(state->dir, 0777) < 0 && errno != EEXIST)
+		die_errno(_("failed to create directory '%s'"), state->dir);
+
+	/*
+	 * NOTE: Since the "next" and "last" files determine if an am_state
+	 * session is in progress, they should be written last.
+	 */
+
+	write_file(am_path(state, "next"), 1, "%d", state->cur);
+
+	write_file(am_path(state, "last"), 1, "%d", state->last);
+}
+
+/**
+ * Increments the patch pointer, and cleans am_state for the application of the
+ * next patch.
+ */
+static void am_next(struct am_state *state)
+{
+	state->cur++;
+	write_file(am_path(state, "next"), 1, "%d", state->cur);
+}
+
+/**
+ * Applies all queued mail.
+ */
+static void am_run(struct am_state *state)
+{
+	while (state->cur <= state->last) {
+
+		/* NEEDSWORK: Patch application not implemented yet */
+
+		am_next(state);
+	}
+
+	am_destroy(state);
+}
 
 int cmd_am(int argc, const char **argv, const char *prefix)
 {
+	struct am_state state;
+
+	const char * const usage[] = {
+		N_("git am [options] [(<mbox>|<Maildir>)...]"),
+		NULL
+	};
+
+	struct option options[] = {
+		OPT_END()
+	};
 
 	/*
 	 * NEEDSWORK: Once all the features of git-am.sh have been
@@ -25,5 +190,20 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		setup_work_tree();
 	}
 
+	git_config(git_default_config, NULL);
+
+	am_state_init(&state, git_path("rebase-apply"));
+
+	argc = parse_options(argc, argv, prefix, options, usage, 0);
+
+	if (am_in_progress(&state))
+		am_load(&state);
+	else
+		am_setup(&state);
+
+	am_run(&state);
+
+	am_state_release(&state);
+
 	return 0;
 }
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 05/44] builtin-am: split out mbox/maildir patches with git-mailsplit
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (3 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 04/44] builtin-am: implement patch queue mechanism Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 06/44] builtin-am: auto-detect mbox patches Paul Tan
                   ` (41 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

git-am.sh supports mbox, stgit and mercurial patches. Re-implement
support for splitting out mbox/maildirs using git-mailsplit, while also
implementing the framework required to support other patch formats in
the future.

Re-implement support for the --patch-format option (since a5a6755
(git-am foreign patch support: introduce patch_format, 2009-05-27)) to
allow the user to choose between the different patch formats.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 107 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 104 insertions(+), 3 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 292f793..ae93e0e 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -8,6 +8,12 @@
 #include "exec_cmd.h"
 #include "parse-options.h"
 #include "dir.h"
+#include "run-command.h"
+
+enum patch_format {
+	PATCH_FORMAT_UNKNOWN = 0,
+	PATCH_FORMAT_MBOX
+};
 
 struct am_state {
 	/* state directory path */
@@ -16,6 +22,9 @@ struct am_state {
 	/* current and last patch numbers, 1-indexed */
 	int cur;
 	int last;
+
+	/* number of digits in patch filename */
+	int prec;
 };
 
 /**
@@ -28,6 +37,8 @@ static void am_state_init(struct am_state *state, const char *dir)
 
 	assert(dir);
 	state->dir = xstrdup(dir);
+
+	state->prec = 4;
 }
 
 /**
@@ -120,13 +131,71 @@ static void am_destroy(const struct am_state *state)
 }
 
 /**
+ * Splits out individual email patches from `paths`, where each path is either
+ * a mbox file or a Maildir. Returns 0 on success, -1 on failure.
+ */
+static int split_mail_mbox(struct am_state *state, const char **paths)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	struct strbuf last = STRBUF_INIT;
+
+	cp.git_cmd = 1;
+	argv_array_push(&cp.args, "mailsplit");
+	argv_array_pushf(&cp.args, "-d%d", state->prec);
+	argv_array_pushf(&cp.args, "-o%s", state->dir);
+	argv_array_push(&cp.args, "-b");
+	argv_array_push(&cp.args, "--");
+	argv_array_pushv(&cp.args, paths);
+
+	if (capture_command(&cp, &last, 8))
+		return -1;
+
+	state->cur = 1;
+	state->last = strtol(last.buf, NULL, 10);
+
+	return 0;
+}
+
+/**
+ * Splits a list of files/directories into individual email patches. Each path
+ * in `paths` must be a file/directory that is formatted according to
+ * `patch_format`.
+ *
+ * Once split out, the individual email patches will be stored in the state
+ * directory, with each patch's filename being its index, padded to state->prec
+ * digits.
+ *
+ * state->cur will be set to the index of the first mail, and state->last will
+ * be set to the index of the last mail.
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+static int split_mail(struct am_state *state, enum patch_format patch_format,
+			const char **paths)
+{
+	switch (patch_format) {
+	case PATCH_FORMAT_MBOX:
+		return split_mail_mbox(state, paths);
+	default:
+		die("BUG: invalid patch_format");
+	}
+	return -1;
+}
+
+/**
  * Setup a new am session for applying patches
  */
-static void am_setup(struct am_state *state)
+static void am_setup(struct am_state *state, enum patch_format patch_format,
+			const char **paths)
 {
 	if (mkdir(state->dir, 0777) < 0 && errno != EEXIST)
 		die_errno(_("failed to create directory '%s'"), state->dir);
 
+	if (split_mail(state, patch_format, paths) < 0) {
+		am_destroy(state);
+		die(_("Failed to split patches."));
+	}
+
 	/*
 	 * NOTE: Since the "next" and "last" files determine if an am_state
 	 * session is in progress, they should be written last.
@@ -162,9 +231,25 @@ static void am_run(struct am_state *state)
 	am_destroy(state);
 }
 
+/**
+ * parse_options() callback that validates and sets opt->value to the
+ * PATCH_FORMAT_* enum value corresponding to `arg`.
+ */
+static int parse_opt_patchformat(const struct option *opt, const char *arg, int unset)
+{
+	int *opt_value = opt->value;
+
+	if (!strcmp(arg, "mbox"))
+		*opt_value = PATCH_FORMAT_MBOX;
+	else
+		return error(_("Invalid value for --patch-format: %s"), arg);
+	return 0;
+}
+
 int cmd_am(int argc, const char **argv, const char *prefix)
 {
 	struct am_state state;
+	int patch_format = PATCH_FORMAT_UNKNOWN;
 
 	const char * const usage[] = {
 		N_("git am [options] [(<mbox>|<Maildir>)...]"),
@@ -172,6 +257,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 	};
 
 	struct option options[] = {
+		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
+			N_("format the patch(es) are in"),
+			parse_opt_patchformat),
 		OPT_END()
 	};
 
@@ -198,8 +286,21 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 
 	if (am_in_progress(&state))
 		am_load(&state);
-	else
-		am_setup(&state);
+	else {
+		struct argv_array paths = ARGV_ARRAY_INIT;
+		int i;
+
+		for (i = 0; i < argc; i++) {
+			if (is_absolute_path(argv[i]) || !prefix)
+				argv_array_push(&paths, argv[i]);
+			else
+				argv_array_push(&paths, mkpath("%s/%s", prefix, argv[i]));
+		}
+
+		am_setup(&state, patch_format, paths.argv);
+
+		argv_array_clear(&paths);
+	}
 
 	am_run(&state);
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 06/44] builtin-am: auto-detect mbox patches
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (4 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 05/44] builtin-am: split out mbox/maildir patches with git-mailsplit Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 07/44] builtin-am: extract patch and commit info with git-mailinfo Paul Tan
                   ` (40 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 15ced75 (git-am foreign patch support: autodetect some patch
formats, 2009-05-27), git-am.sh is able to autodetect mbox, stgit and
mercurial patches through heuristics.

Re-implement support for autodetecting mbox/maildir files in
builtin/am.c.

RFC 2822 requires that lines are terminated by "\r\n". To support this,
implement strbuf_getline_crlf(), which will remove both '\n' and "\r\n"
from the end of the line.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index ae93e0e..9422adc 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -10,6 +10,21 @@
 #include "dir.h"
 #include "run-command.h"
 
+/**
+ * Like strbuf_getline(), but treats both '\n' and "\r\n" as line terminators.
+ */
+static int strbuf_getline_crlf(struct strbuf *sb, FILE *fp)
+{
+	if (strbuf_getwholeline(sb, fp, '\n'))
+		return EOF;
+	if (sb->buf[sb->len - 1] == '\n') {
+		strbuf_setlen(sb, sb->len - 1);
+		if (sb->len > 0 && sb->buf[sb->len - 1] == '\r')
+			strbuf_setlen(sb, sb->len - 1);
+	}
+	return 0;
+}
+
 enum patch_format {
 	PATCH_FORMAT_UNKNOWN = 0,
 	PATCH_FORMAT_MBOX
@@ -131,6 +146,92 @@ static void am_destroy(const struct am_state *state)
 }
 
 /**
+ * Determines if the file looks like a piece of RFC2822 mail by grabbing all
+ * non-indented lines and checking if they look like they begin with valid
+ * header field names.
+ *
+ * Returns 1 if the file looks like a piece of mail, 0 otherwise.
+ */
+static int is_mail(FILE *fp)
+{
+	const char *header_regex = "^[!-9;-~]+:";
+	struct strbuf sb = STRBUF_INIT;
+	regex_t regex;
+	int ret = 1;
+
+	if (fseek(fp, 0L, SEEK_SET))
+		die_errno(_("fseek failed"));
+
+	if (regcomp(&regex, header_regex, REG_NOSUB | REG_EXTENDED))
+		die("invalid pattern: %s", header_regex);
+
+	while (!strbuf_getline_crlf(&sb, fp)) {
+		if (!sb.len)
+			break; /* End of header */
+
+		/* Ignore indented folded lines */
+		if (*sb.buf == '\t' || *sb.buf == ' ')
+			continue;
+
+		/* It's a header if it matches header_regex */
+		if (regexec(&regex, sb.buf, 0, NULL, 0)) {
+			ret = 0;
+			goto done;
+		}
+	}
+
+done:
+	regfree(&regex);
+	strbuf_release(&sb);
+	return ret;
+}
+
+/**
+ * Attempts to detect the patch_format of the patches contained in `paths`,
+ * returning the PATCH_FORMAT_* enum value. Returns PATCH_FORMAT_UNKNOWN if
+ * detection fails.
+ */
+static int detect_patch_format(const char **paths)
+{
+	enum patch_format ret = PATCH_FORMAT_UNKNOWN;
+	struct strbuf l1 = STRBUF_INIT;
+	FILE *fp;
+
+	/*
+	 * We default to mbox format if input is from stdin and for directories
+	 */
+	if (!*paths || !strcmp(*paths, "-") || is_directory(*paths))
+		return PATCH_FORMAT_MBOX;
+
+	/*
+	 * Otherwise, check the first few lines of the first patch, starting
+	 * from the first non-blank line, to try to detect its format.
+	 */
+
+	fp = xfopen(*paths, "r");
+
+	while (!strbuf_getline_crlf(&l1, fp)) {
+		if (l1.len)
+			break;
+	}
+
+	if (starts_with(l1.buf, "From ") || starts_with(l1.buf, "From: ")) {
+		ret = PATCH_FORMAT_MBOX;
+		goto done;
+	}
+
+	if (l1.len && is_mail(fp)) {
+		ret = PATCH_FORMAT_MBOX;
+		goto done;
+	}
+
+done:
+	fclose(fp);
+	strbuf_release(&l1);
+	return ret;
+}
+
+/**
  * Splits out individual email patches from `paths`, where each path is either
  * a mbox file or a Maildir. Returns 0 on success, -1 on failure.
  */
@@ -188,6 +289,14 @@ static int split_mail(struct am_state *state, enum patch_format patch_format,
 static void am_setup(struct am_state *state, enum patch_format patch_format,
 			const char **paths)
 {
+	if (!patch_format)
+		patch_format = detect_patch_format(paths);
+
+	if (!patch_format) {
+		fprintf_ln(stderr, _("Patch format detection failed."));
+		exit(128);
+	}
+
 	if (mkdir(state->dir, 0777) < 0 && errno != EEXIST)
 		die_errno(_("failed to create directory '%s'"), state->dir);
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 07/44] builtin-am: extract patch and commit info with git-mailinfo
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (5 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 06/44] builtin-am: auto-detect mbox patches Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 08/44] builtin-am: apply patch with git-apply Paul Tan
                   ` (39 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

For the purpose of applying the patch and committing the results,
implement extracting the patch data, commit message and authorship from
an e-mail message using git-mailinfo.

git-mailinfo is run as a separate process, but ideally in the future,
we should be be able to access its functionality directly without
spawning a new process.

Helped-by: Junio C Hamano <gitster@pobox.com>
Helped-by: Jeff King <peff@peff.net>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 335 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 335 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 9422adc..4897857 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -9,6 +9,23 @@
 #include "parse-options.h"
 #include "dir.h"
 #include "run-command.h"
+#include "quote.h"
+
+/**
+ * Returns 1 if the file is empty or does not exist, 0 otherwise.
+ */
+static int is_empty_file(const char *filename)
+{
+	struct stat st;
+
+	if (stat(filename, &st) < 0) {
+		if (errno == ENOENT)
+			return 1;
+		die_errno(_("could not stat %s"), filename);
+	}
+
+	return !st.st_size;
+}
 
 /**
  * Like strbuf_getline(), but treats both '\n' and "\r\n" as line terminators.
@@ -38,6 +55,13 @@ struct am_state {
 	int cur;
 	int last;
 
+	/* commit metadata and message */
+	char *author_name;
+	char *author_email;
+	char *author_date;
+	char *msg;
+	size_t msg_len;
+
 	/* number of digits in patch filename */
 	int prec;
 };
@@ -63,6 +87,18 @@ static void am_state_release(struct am_state *state)
 {
 	if (state->dir)
 		free(state->dir);
+
+	if (state->author_name)
+		free(state->author_name);
+
+	if (state->author_email)
+		free(state->author_email);
+
+	if (state->author_date)
+		free(state->author_date);
+
+	if (state->msg)
+		free(state->msg);
 }
 
 /**
@@ -115,6 +151,167 @@ static int read_state_file(struct strbuf *sb, const struct am_state *state,
 }
 
 /**
+ * Reads a KEY=VALUE shell variable assignment from `fp`, returning the VALUE
+ * as a newly-allocated string. VALUE must be a quoted string, and the KEY must
+ * match `key`. Returns NULL on failure.
+ *
+ * This is used by read_author_script() to read the GIT_AUTHOR_* variables from
+ * the author-script.
+ */
+static char *read_shell_var(FILE *fp, const char *key)
+{
+	struct strbuf sb = STRBUF_INIT;
+	const char *str;
+
+	if (strbuf_getline(&sb, fp, '\n'))
+		goto fail;
+
+	if (!skip_prefix(sb.buf, key, &str))
+		goto fail;
+
+	if (!skip_prefix(str, "=", &str))
+		goto fail;
+
+	strbuf_remove(&sb, 0, str - sb.buf);
+
+	str = sq_dequote(sb.buf);
+	if (!str)
+		goto fail;
+
+	return strbuf_detach(&sb, NULL);
+
+fail:
+	strbuf_release(&sb);
+	return NULL;
+}
+
+/**
+ * Reads and parses the state directory's "author-script" file, and sets
+ * state->author_name, state->author_email and state->author_date accordingly.
+ * Returns 0 on success, -1 if the file could not be parsed.
+ *
+ * The author script is of the format:
+ *
+ *	GIT_AUTHOR_NAME='$author_name'
+ *	GIT_AUTHOR_EMAIL='$author_email'
+ *	GIT_AUTHOR_DATE='$author_date'
+ *
+ * where $author_name, $author_email and $author_date are quoted. We are strict
+ * with our parsing, as the file was meant to be eval'd in the old git-am.sh
+ * script, and thus if the file differs from what this function expects, it is
+ * better to bail out than to do something that the user does not expect.
+ */
+static int read_author_script(struct am_state *state)
+{
+	const char *filename = am_path(state, "author-script");
+	FILE *fp;
+
+	assert(!state->author_name);
+	assert(!state->author_email);
+	assert(!state->author_date);
+
+	fp = fopen(filename, "r");
+	if (!fp) {
+		if (errno == ENOENT)
+			return 0;
+		die_errno(_("could not open '%s' for reading"), filename);
+	}
+
+	state->author_name = read_shell_var(fp, "GIT_AUTHOR_NAME");
+	if (!state->author_name) {
+		fclose(fp);
+		return -1;
+	}
+
+	state->author_email = read_shell_var(fp, "GIT_AUTHOR_EMAIL");
+	if (!state->author_email) {
+		fclose(fp);
+		return -1;
+	}
+
+	state->author_date = read_shell_var(fp, "GIT_AUTHOR_DATE");
+	if (!state->author_date) {
+		fclose(fp);
+		return -1;
+	}
+
+	if (fgetc(fp) != EOF) {
+		fclose(fp);
+		return -1;
+	}
+
+	fclose(fp);
+	return 0;
+}
+
+/**
+ * Saves state->author_name, state->author_email and state->author_date in the
+ * state directory's "author-script" file.
+ */
+static void write_author_script(const struct am_state *state)
+{
+	struct strbuf sb = STRBUF_INIT;
+
+	assert(state->author_name);
+	assert(state->author_email);
+	assert(state->author_date);
+
+	strbuf_addstr(&sb, "GIT_AUTHOR_NAME=");
+	sq_quote_buf(&sb, state->author_name);
+	strbuf_addch(&sb, '\n');
+
+	strbuf_addstr(&sb, "GIT_AUTHOR_EMAIL=");
+	sq_quote_buf(&sb, state->author_email);
+	strbuf_addch(&sb, '\n');
+
+	strbuf_addstr(&sb, "GIT_AUTHOR_DATE=");
+	sq_quote_buf(&sb, state->author_date);
+	strbuf_addch(&sb, '\n');
+
+	write_file(am_path(state, "author-script"), 1, "%s", sb.buf);
+
+	strbuf_release(&sb);
+}
+
+/**
+ * Reads the commit message from the state directory's "final-commit" file,
+ * setting state->msg to its contents and state->msg_len to the length of its
+ * contents in bytes.
+ *
+ * Returns 0 on success, -1 if the file does not exist.
+ */
+static int read_commit_msg(struct am_state *state)
+{
+	struct strbuf sb = STRBUF_INIT;
+
+	assert(!state->msg);
+
+	if (read_state_file(&sb, state, "final-commit", 0) < 0) {
+		strbuf_release(&sb);
+		return -1;
+	}
+
+	state->msg = strbuf_detach(&sb, &state->msg_len);
+	return 0;
+}
+
+/**
+ * Saves state->msg in the state directory's "final-commit" file.
+ */
+static void write_commit_msg(const struct am_state *state)
+{
+	int fd;
+	const char *filename = am_path(state, "final-commit");
+
+	assert(state->msg);
+
+	fd = xopen(filename, O_WRONLY | O_CREAT, 0666);
+	if (write_in_full(fd, state->msg, state->msg_len) < 0)
+		die_errno(_("could not write to %s"), filename);
+	close(fd);
+}
+
+/**
  * Loads state from disk.
  */
 static void am_load(struct am_state *state)
@@ -129,6 +326,11 @@ static void am_load(struct am_state *state)
 		die("BUG: state file 'last' does not exist");
 	state->last = strtol(sb.buf, NULL, 10);
 
+	if (read_author_script(state) < 0)
+		die(_("could not parse author script"));
+
+	read_commit_msg(state);
+
 	strbuf_release(&sb);
 }
 
@@ -321,19 +523,152 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
  */
 static void am_next(struct am_state *state)
 {
+	if (state->author_name)
+		free(state->author_name);
+	state->author_name = NULL;
+
+	if (state->author_email)
+		free(state->author_email);
+	state->author_email = NULL;
+
+	if (state->author_date)
+		free(state->author_date);
+	state->author_date = NULL;
+
+	if (state->msg)
+		free(state->msg);
+	state->msg = NULL;
+	state->msg_len = 0;
+
+	unlink(am_path(state, "author-script"));
+	unlink(am_path(state, "final-commit"));
+
 	state->cur++;
 	write_file(am_path(state, "next"), 1, "%d", state->cur);
 }
 
 /**
+ * Returns the filename of the current patch email.
+ */
+static const char *msgnum(const struct am_state *state)
+{
+	static struct strbuf sb = STRBUF_INIT;
+
+	strbuf_reset(&sb);
+	strbuf_addf(&sb, "%0*d", state->prec, state->cur);
+
+	return sb.buf;
+}
+
+/**
+ * Parses `mail` using git-mailinfo, extracting its patch and authorship info.
+ * state->msg will be set to the patch message. state->author_name,
+ * state->author_email and state->author_date will be set to the patch author's
+ * name, email and date respectively. The patch body will be written to the
+ * state directory's "patch" file.
+ *
+ * Returns 1 if the patch should be skipped, 0 otherwise.
+ */
+static int parse_mail(struct am_state *state, const char *mail)
+{
+	FILE *fp;
+	struct child_process cp = CHILD_PROCESS_INIT;
+	struct strbuf sb = STRBUF_INIT;
+	struct strbuf msg = STRBUF_INIT;
+	struct strbuf author_name = STRBUF_INIT;
+	struct strbuf author_date = STRBUF_INIT;
+	struct strbuf author_email = STRBUF_INIT;
+	int ret = 0;
+
+	cp.git_cmd = 1;
+	cp.in = xopen(mail, O_RDONLY, 0);
+	cp.out = xopen(am_path(state, "info"), O_WRONLY | O_CREAT, 0777);
+
+	argv_array_push(&cp.args, "mailinfo");
+	argv_array_push(&cp.args, am_path(state, "msg"));
+	argv_array_push(&cp.args, am_path(state, "patch"));
+
+	if (run_command(&cp) < 0)
+		die("could not parse patch");
+
+	close(cp.in);
+	close(cp.out);
+
+	/* Extract message and author information */
+	fp = xfopen(am_path(state, "info"), "r");
+	while (!strbuf_getline(&sb, fp, '\n')) {
+		const char *x;
+
+		if (skip_prefix(sb.buf, "Subject: ", &x)) {
+			if (msg.len)
+				strbuf_addch(&msg, '\n');
+			strbuf_addstr(&msg, x);
+		} else if (skip_prefix(sb.buf, "Author: ", &x))
+			strbuf_addstr(&author_name, x);
+		else if (skip_prefix(sb.buf, "Email: ", &x))
+			strbuf_addstr(&author_email, x);
+		else if (skip_prefix(sb.buf, "Date: ", &x))
+			strbuf_addstr(&author_date, x);
+	}
+	fclose(fp);
+
+	/* Skip pine's internal folder data */
+	if (!strcmp(author_name.buf, "Mail System Internal Data")) {
+		ret = 1;
+		goto finish;
+	}
+
+	if (is_empty_file(am_path(state, "patch"))) {
+		printf_ln(_("Patch is empty. Was it split wrong?"));
+		exit(128);
+	}
+
+	strbuf_addstr(&msg, "\n\n");
+	if (strbuf_read_file(&msg, am_path(state, "msg"), 0) < 0)
+		die_errno(_("could not read '%s'"), am_path(state, "msg"));
+	stripspace(&msg, 0);
+
+	assert(!state->author_name);
+	state->author_name = strbuf_detach(&author_name, NULL);
+
+	assert(!state->author_email);
+	state->author_email = strbuf_detach(&author_email, NULL);
+
+	assert(!state->author_date);
+	state->author_date = strbuf_detach(&author_date, NULL);
+
+	assert(!state->msg);
+	state->msg = strbuf_detach(&msg, &state->msg_len);
+
+finish:
+	strbuf_release(&msg);
+	strbuf_release(&author_date);
+	strbuf_release(&author_email);
+	strbuf_release(&author_name);
+	strbuf_release(&sb);
+	return ret;
+}
+
+/**
  * Applies all queued mail.
  */
 static void am_run(struct am_state *state)
 {
 	while (state->cur <= state->last) {
+		const char *mail = am_path(state, msgnum(state));
+
+		if (!file_exists(mail))
+			goto next;
+
+		if (parse_mail(state, mail))
+			goto next; /* mail should be skipped */
+
+		write_author_script(state);
+		write_commit_msg(state);
 
 		/* NEEDSWORK: Patch application not implemented yet */
 
+next:
 		am_next(state);
 	}
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 08/44] builtin-am: apply patch with git-apply
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (6 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 07/44] builtin-am: extract patch and commit info with git-mailinfo Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 09/44] builtin-am: implement committing applied patch Paul Tan
                   ` (38 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Implement applying the patch to the index using git-apply.

If a file is unchanged but stat-dirty, git-apply may erroneously fail to
apply patches, thinking that they conflict with a dirty working tree.

As such, since 2a6f08a (am: refresh the index at start and --resolved,
2011-08-15), git-am will refresh the index before applying patches.
Re-implement this behavior.

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 72 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index 4897857..9c7a6c8 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -10,6 +10,7 @@
 #include "dir.h"
 #include "run-command.h"
 #include "quote.h"
+#include "lockfile.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -42,6 +43,14 @@ static int strbuf_getline_crlf(struct strbuf *sb, FILE *fp)
 	return 0;
 }
 
+/**
+ * Returns the length of the first line of msg.
+ */
+static int linelen(const char *msg)
+{
+	return strchrnul(msg, '\n') - msg;
+}
+
 enum patch_format {
 	PATCH_FORMAT_UNKNOWN = 0,
 	PATCH_FORMAT_MBOX
@@ -561,6 +570,20 @@ static const char *msgnum(const struct am_state *state)
 }
 
 /**
+ * Refresh and write index.
+ */
+static void refresh_and_write_cache(void)
+{
+	static struct lock_file lock_file;
+
+	hold_locked_index(&lock_file, 1);
+	refresh_cache(REFRESH_QUIET);
+	if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
+		die(_("unable to write index file"));
+	rollback_lock_file(&lock_file);
+}
+
+/**
  * Parses `mail` using git-mailinfo, extracting its patch and authorship info.
  * state->msg will be set to the patch message. state->author_name,
  * state->author_email and state->author_date will be set to the patch author's
@@ -650,10 +673,35 @@ finish:
 }
 
 /**
+ * Applies current patch with git-apply. Returns 0 on success, -1 otherwise.
+ */
+static int run_apply(const struct am_state *state)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	cp.git_cmd = 1;
+
+	argv_array_push(&cp.args, "apply");
+	argv_array_push(&cp.args, "--index");
+	argv_array_push(&cp.args, am_path(state, "patch"));
+
+	if (run_command(&cp))
+		return -1;
+
+	/* Reload index as git-apply will have modified it. */
+	discard_cache();
+	read_cache();
+
+	return 0;
+}
+
+/**
  * Applies all queued mail.
  */
 static void am_run(struct am_state *state)
 {
+	refresh_and_write_cache();
+
 	while (state->cur <= state->last) {
 		const char *mail = am_path(state, msgnum(state));
 
@@ -666,7 +714,27 @@ static void am_run(struct am_state *state)
 		write_author_script(state);
 		write_commit_msg(state);
 
-		/* NEEDSWORK: Patch application not implemented yet */
+		printf_ln(_("Applying: %.*s"), linelen(state->msg), state->msg);
+
+		if (run_apply(state) < 0) {
+			int advice_amworkdir = 1;
+
+			printf_ln(_("Patch failed at %s %.*s"), msgnum(state),
+				linelen(state->msg), state->msg);
+
+			git_config_get_bool("advice.amworkdir", &advice_amworkdir);
+
+			if (advice_amworkdir)
+				printf_ln(_("The copy of the patch that failed is found in: %s"),
+						am_path(state, "patch"));
+
+			exit(128);
+		}
+
+		/*
+		 * NEEDSWORK: After the patch has been applied to the index
+		 * with git-apply, we need to make commit as well.
+		 */
 
 next:
 		am_next(state);
@@ -728,6 +796,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 
 	argc = parse_options(argc, argv, prefix, options, usage, 0);
 
+	if (read_index_preload(&the_index, NULL) < 0)
+		die(_("failed to read the index"));
+
 	if (am_in_progress(&state))
 		am_load(&state);
 	else {
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 09/44] builtin-am: implement committing applied patch
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (7 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 08/44] builtin-am: apply patch with git-apply Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 10/44] builtin-am: refuse to apply patches if index is dirty Paul Tan
                   ` (37 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Implement do_commit(), which commits the index which contains the
results of applying the patch, along with the extracted commit message
and authorship information.

Since 29b6754 (am: remove rebase-apply directory before gc, 2010-02-22),
git gc --auto is also invoked to pack the loose objects that are created
from making the commits.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 51 insertions(+), 4 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 9c7a6c8..bbb540c 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -11,6 +11,9 @@
 #include "run-command.h"
 #include "quote.h"
 #include "lockfile.h"
+#include "cache-tree.h"
+#include "refs.h"
+#include "commit.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -696,10 +699,56 @@ static int run_apply(const struct am_state *state)
 }
 
 /**
+ * Commits the current index with state->msg as the commit message and
+ * state->author_name, state->author_email and state->author_date as the author
+ * information.
+ */
+static void do_commit(const struct am_state *state)
+{
+	unsigned char tree[GIT_SHA1_RAWSZ], parent[GIT_SHA1_RAWSZ],
+		      commit[GIT_SHA1_RAWSZ];
+	unsigned char *ptr;
+	struct commit_list *parents = NULL;
+	const char *reflog_msg, *author;
+	struct strbuf sb = STRBUF_INIT;
+
+	if (write_cache_as_tree(tree, 0, NULL))
+		die(_("git write-tree failed to write a tree"));
+
+	if (!get_sha1_commit("HEAD", parent)) {
+		ptr = parent;
+		commit_list_insert(lookup_commit(parent), &parents);
+	} else {
+		ptr = NULL;
+		fprintf_ln(stderr, _("applying to an empty history"));
+	}
+
+	author = fmt_ident(state->author_name, state->author_email,
+			state->author_date, IDENT_STRICT);
+
+	if (commit_tree(state->msg, state->msg_len, tree, parents, commit,
+				author, NULL))
+		die(_("failed to write commit object"));
+
+	reflog_msg = getenv("GIT_REFLOG_ACTION");
+	if (!reflog_msg)
+		reflog_msg = "am";
+
+	strbuf_addf(&sb, "%s: %.*s", reflog_msg, linelen(state->msg),
+			state->msg);
+
+	update_ref(sb.buf, "HEAD", commit, ptr, 0, UPDATE_REFS_DIE_ON_ERR);
+
+	strbuf_release(&sb);
+}
+
+/**
  * Applies all queued mail.
  */
 static void am_run(struct am_state *state)
 {
+	const char *argv_gc_auto[] = {"gc", "--auto", NULL};
+
 	refresh_and_write_cache();
 
 	while (state->cur <= state->last) {
@@ -731,16 +780,14 @@ static void am_run(struct am_state *state)
 			exit(128);
 		}
 
-		/*
-		 * NEEDSWORK: After the patch has been applied to the index
-		 * with git-apply, we need to make commit as well.
-		 */
+		do_commit(state);
 
 next:
 		am_next(state);
 	}
 
 	am_destroy(state);
+	run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
 }
 
 /**
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 10/44] builtin-am: refuse to apply patches if index is dirty
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (8 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 09/44] builtin-am: implement committing applied patch Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 11/44] builtin-am: implement --resolved/--continue Paul Tan
                   ` (36 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07), git-am
will refuse to apply patches if the index is dirty. Re-implement this
behavior in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index bbb540c..f9a641a 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -14,6 +14,8 @@
 #include "cache-tree.h"
 #include "refs.h"
 #include "commit.h"
+#include "diff.h"
+#include "diffcore.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -587,6 +589,43 @@ static void refresh_and_write_cache(void)
 }
 
 /**
+ * Returns 1 if the index differs from HEAD, 0 otherwise. When on an unborn
+ * branch, returns 1 if there are entries in the index, 0 otherwise. If an
+ * strbuf is provided, the space-separated list of files that differ will be
+ * appended to it.
+ */
+static int index_has_changes(struct strbuf *sb)
+{
+	unsigned char head[GIT_SHA1_RAWSZ];
+	int i;
+
+	if (!get_sha1_tree("HEAD", head)) {
+		struct diff_options opt;
+
+		diff_setup(&opt);
+		DIFF_OPT_SET(&opt, EXIT_WITH_STATUS);
+		if (!sb)
+			DIFF_OPT_SET(&opt, QUICK);
+		do_diff_cache(head, &opt);
+		diffcore_std(&opt);
+		for (i = 0; sb && i < diff_queued_diff.nr; i++) {
+			if (i)
+				strbuf_addch(sb, ' ');
+			strbuf_addstr(sb, diff_queued_diff.queue[i]->two->path);
+		}
+		diff_flush(&opt);
+		return DIFF_OPT_TST(&opt, HAS_CHANGES) != 0;
+	} else {
+		for (i = 0; sb && i < active_nr; i++) {
+			if (i)
+				strbuf_addch(sb, ' ');
+			strbuf_addstr(sb, active_cache[i]->name);
+		}
+		return !!active_nr;
+	}
+}
+
+/**
  * Parses `mail` using git-mailinfo, extracting its patch and authorship info.
  * state->msg will be set to the patch message. state->author_name,
  * state->author_email and state->author_date will be set to the patch author's
@@ -748,9 +787,15 @@ static void do_commit(const struct am_state *state)
 static void am_run(struct am_state *state)
 {
 	const char *argv_gc_auto[] = {"gc", "--auto", NULL};
+	struct strbuf sb = STRBUF_INIT;
 
 	refresh_and_write_cache();
 
+	if (index_has_changes(&sb))
+		die(_("Dirty index: cannot apply patches (dirty: %s)"), sb.buf);
+
+	strbuf_release(&sb);
+
 	while (state->cur <= state->last) {
 		const char *mail = am_path(state, msgnum(state));
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 11/44] builtin-am: implement --resolved/--continue
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (9 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 10/44] builtin-am: refuse to apply patches if index is dirty Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 12/44] builtin-am: implement --skip Paul Tan
                   ` (35 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 0c15cc9 (git-am: --resolved., 2005-11-16), git-am supported
resuming from a failed patch application. The user will manually apply
the patch, and the run git am --resolved which will then commit the
resulting index. Re-implement this feature by introducing am_resolve().

Since it makes no sense for the user to run am --resolved when there is
no session in progress, we error out in this case.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 62 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index f9a641a..f21565b 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -836,6 +836,42 @@ next:
 }
 
 /**
+ * Resume the current am session after patch application failure. The user did
+ * all the hard work, and we do not have to do any patch application. Just
+ * trust and commit what the user has in the index and working tree.
+ */
+static void am_resolve(struct am_state *state)
+{
+	if (!state->msg)
+		die(_("cannot resume: %s does not exist."),
+			am_path(state, "final-commit"));
+
+	if (!state->author_name || !state->author_email || !state->author_date)
+		die(_("cannot resume: %s does not exist."),
+			am_path(state, "author-script"));
+
+	printf_ln(_("Applying: %.*s"), linelen(state->msg), state->msg);
+
+	if (!index_has_changes(NULL)) {
+		printf_ln(_("No changes - did you forget to use 'git add'?\n"
+			"If there is nothing left to stage, chances are that something else\n"
+			"already introduced the same changes; you might want to skip this patch."));
+		exit(128);
+	}
+
+	if (unmerged_cache()) {
+		printf_ln(_("You still have unmerged paths in your index.\n"
+			"Did you forget to use 'git add'?"));
+		exit(128);
+	}
+
+	do_commit(state);
+
+	am_next(state);
+	am_run(state);
+}
+
+/**
  * parse_options() callback that validates and sets opt->value to the
  * PATCH_FORMAT_* enum value corresponding to `arg`.
  */
@@ -850,13 +886,20 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
 	return 0;
 }
 
+enum resume_mode {
+	RESUME_FALSE = 0,
+	RESUME_RESOLVED
+};
+
 int cmd_am(int argc, const char **argv, const char *prefix)
 {
 	struct am_state state;
 	int patch_format = PATCH_FORMAT_UNKNOWN;
+	enum resume_mode resume = RESUME_FALSE;
 
 	const char * const usage[] = {
 		N_("git am [options] [(<mbox>|<Maildir>)...]"),
+		N_("git am [options] --continue"),
 		NULL
 	};
 
@@ -864,6 +907,12 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
+		OPT_CMDMODE(0, "continue", &resume,
+			N_("continue applying patches after resolving a conflict"),
+			RESUME_RESOLVED),
+		OPT_CMDMODE('r', "resolved", &resume,
+			N_("synonyms for --continue"),
+			RESUME_RESOLVED),
 		OPT_END()
 	};
 
@@ -897,6 +946,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		struct argv_array paths = ARGV_ARRAY_INIT;
 		int i;
 
+		if (resume)
+			die(_("Resolve operation not in progress, we are not resuming."));
+
 		for (i = 0; i < argc; i++) {
 			if (is_absolute_path(argv[i]) || !prefix)
 				argv_array_push(&paths, argv[i]);
@@ -909,7 +961,16 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		argv_array_clear(&paths);
 	}
 
-	am_run(&state);
+	switch (resume) {
+	case RESUME_FALSE:
+		am_run(&state);
+		break;
+	case RESUME_RESOLVED:
+		am_resolve(&state);
+		break;
+	default:
+		die("BUG: invalid resume value");
+	}
 
 	am_state_release(&state);
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 12/44] builtin-am: implement --skip
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (10 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 11/44] builtin-am: implement --resolved/--continue Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-13 19:05   ` Stefan Beller
  2015-07-07 14:20 ` [PATCH v5 13/44] builtin-am: implement --abort Paul Tan
                   ` (34 subsequent siblings)
  46 siblings, 1 reply; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07), git-am
supported resuming from a failed patch application by skipping the
current patch. Re-implement this feature by introducing am_skip().

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 119 insertions(+), 2 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index f21565b..5087094 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -16,6 +16,8 @@
 #include "commit.h"
 #include "diff.h"
 #include "diffcore.h"
+#include "unpack-trees.h"
+#include "branch.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -872,6 +874,114 @@ static void am_resolve(struct am_state *state)
 }
 
 /**
+ * Performs a checkout fast-forward from `head` to `remote`. If `reset` is
+ * true, any unmerged entries will be discarded. Returns 0 on success, -1 on
+ * failure.
+ */
+static int fast_forward_to(struct tree *head, struct tree *remote, int reset)
+{
+	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+	struct unpack_trees_options opts;
+	struct tree_desc t[2];
+
+	if (parse_tree(head) || parse_tree(remote))
+		return -1;
+
+	hold_locked_index(lock_file, 1);
+
+	refresh_cache(REFRESH_QUIET);
+
+	memset(&opts, 0, sizeof(opts));
+	opts.head_idx = 1;
+	opts.src_index = &the_index;
+	opts.dst_index = &the_index;
+	opts.update = 1;
+	opts.merge = 1;
+	opts.reset = reset;
+	opts.fn = twoway_merge;
+	init_tree_desc(&t[0], head->buffer, head->size);
+	init_tree_desc(&t[1], remote->buffer, remote->size);
+
+	if (unpack_trees(2, t, &opts)) {
+		rollback_lock_file(lock_file);
+		return -1;
+	}
+
+	if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+		die(_("unable to write new index file"));
+
+	return 0;
+}
+
+/**
+ * Clean the index without touching entries that are not modified between
+ * `head` and `remote`.
+ */
+static int clean_index(const unsigned char *head, const unsigned char *remote)
+{
+	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+	struct tree *head_tree, *remote_tree, *index_tree;
+	unsigned char index[GIT_SHA1_RAWSZ];
+	struct pathspec pathspec;
+
+	head_tree = parse_tree_indirect(head);
+	if (!head_tree)
+		return error(_("Could not parse object '%s'."), sha1_to_hex(head));
+
+	remote_tree = parse_tree_indirect(remote);
+	if (!remote_tree)
+		return error(_("Could not parse object '%s'."), sha1_to_hex(remote));
+
+	read_cache_unmerged();
+
+	if (fast_forward_to(head_tree, head_tree, 1))
+		return -1;
+
+	if (write_cache_as_tree(index, 0, NULL))
+		return -1;
+
+	index_tree = parse_tree_indirect(index);
+	if (!index_tree)
+		return error(_("Could not parse object '%s'."), sha1_to_hex(index));
+
+	if (fast_forward_to(index_tree, remote_tree, 0))
+		return -1;
+
+	memset(&pathspec, 0, sizeof(pathspec));
+
+	hold_locked_index(lock_file, 1);
+
+	if (read_tree(remote_tree, 0, &pathspec)) {
+		rollback_lock_file(lock_file);
+		return -1;
+	}
+
+	if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+		die(_("unable to write new index file"));
+
+	remove_branch_state();
+
+	return 0;
+}
+
+/**
+ * Resume the current am session by skipping the current patch.
+ */
+static void am_skip(struct am_state *state)
+{
+	unsigned char head[GIT_SHA1_RAWSZ];
+
+	if (get_sha1("HEAD", head))
+		hashcpy(head, EMPTY_TREE_SHA1_BIN);
+
+	if (clean_index(head, head))
+		die(_("failed to clean index"));
+
+	am_next(state);
+	am_run(state);
+}
+
+/**
  * parse_options() callback that validates and sets opt->value to the
  * PATCH_FORMAT_* enum value corresponding to `arg`.
  */
@@ -888,7 +998,8 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
 
 enum resume_mode {
 	RESUME_FALSE = 0,
-	RESUME_RESOLVED
+	RESUME_RESOLVED,
+	RESUME_SKIP
 };
 
 int cmd_am(int argc, const char **argv, const char *prefix)
@@ -899,7 +1010,7 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 
 	const char * const usage[] = {
 		N_("git am [options] [(<mbox>|<Maildir>)...]"),
-		N_("git am [options] --continue"),
+		N_("git am [options] (--continue | --skip)"),
 		NULL
 	};
 
@@ -913,6 +1024,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_CMDMODE('r', "resolved", &resume,
 			N_("synonyms for --continue"),
 			RESUME_RESOLVED),
+		OPT_CMDMODE(0, "skip", &resume,
+			N_("skip the current patch"),
+			RESUME_SKIP),
 		OPT_END()
 	};
 
@@ -968,6 +1082,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 	case RESUME_RESOLVED:
 		am_resolve(&state);
 		break;
+	case RESUME_SKIP:
+		am_skip(&state);
+		break;
 	default:
 		die("BUG: invalid resume value");
 	}
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 13/44] builtin-am: implement --abort
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (11 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 12/44] builtin-am: implement --skip Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 14/44] builtin-am: reject patches when there's a session in progress Paul Tan
                   ` (33 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 3e5057a (git am --abort, 2008-07-16), git-am supported the --abort
option that will rewind HEAD back to the original commit. Re-implement
this through am_abort().

Since 7b3b7e3 (am --abort: keep unrelated commits since the last failure
and warn, 2010-12-21), to prevent commits made since the last failure
from being lost, git-am will not rewind HEAD back to the original
commit if HEAD moved since the last failure. Re-implement this through
safe_to_abort().

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 99 insertions(+), 3 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 5087094..1db95f2 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -507,6 +507,8 @@ static int split_mail(struct am_state *state, enum patch_format patch_format,
 static void am_setup(struct am_state *state, enum patch_format patch_format,
 			const char **paths)
 {
+	unsigned char curr_head[GIT_SHA1_RAWSZ];
+
 	if (!patch_format)
 		patch_format = detect_patch_format(paths);
 
@@ -523,6 +525,14 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 		die(_("Failed to split patches."));
 	}
 
+	if (!get_sha1("HEAD", curr_head)) {
+		write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(curr_head));
+		update_ref("am", "ORIG_HEAD", curr_head, NULL, 0, UPDATE_REFS_DIE_ON_ERR);
+	} else {
+		write_file(am_path(state, "abort-safety"), 1, "%s", "");
+		delete_ref("ORIG_HEAD", NULL, 0);
+	}
+
 	/*
 	 * NOTE: Since the "next" and "last" files determine if an am_state
 	 * session is in progress, they should be written last.
@@ -539,6 +549,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
  */
 static void am_next(struct am_state *state)
 {
+	unsigned char head[GIT_SHA1_RAWSZ];
+
 	if (state->author_name)
 		free(state->author_name);
 	state->author_name = NULL;
@@ -559,6 +571,11 @@ static void am_next(struct am_state *state)
 	unlink(am_path(state, "author-script"));
 	unlink(am_path(state, "final-commit"));
 
+	if (!get_sha1("HEAD", head))
+		write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(head));
+	else
+		write_file(am_path(state, "abort-safety"), 1, "%s", "");
+
 	state->cur++;
 	write_file(am_path(state, "next"), 1, "%d", state->cur);
 }
@@ -791,10 +808,14 @@ static void am_run(struct am_state *state)
 	const char *argv_gc_auto[] = {"gc", "--auto", NULL};
 	struct strbuf sb = STRBUF_INIT;
 
+	unlink(am_path(state, "dirtyindex"));
+
 	refresh_and_write_cache();
 
-	if (index_has_changes(&sb))
+	if (index_has_changes(&sb)) {
+		write_file(am_path(state, "dirtyindex"), 1, "t");
 		die(_("Dirty index: cannot apply patches (dirty: %s)"), sb.buf);
+	}
 
 	strbuf_release(&sb);
 
@@ -982,6 +1003,74 @@ static void am_skip(struct am_state *state)
 }
 
 /**
+ * Returns true if it is safe to reset HEAD to the ORIG_HEAD, false otherwise.
+ *
+ * It is not safe to reset HEAD when:
+ * 1. git-am previously failed because the index was dirty.
+ * 2. HEAD has moved since git-am previously failed.
+ */
+static int safe_to_abort(const struct am_state *state)
+{
+	struct strbuf sb = STRBUF_INIT;
+	unsigned char abort_safety[GIT_SHA1_RAWSZ], head[GIT_SHA1_RAWSZ];
+
+	if (file_exists(am_path(state, "dirtyindex")))
+		return 0;
+
+	if (read_state_file(&sb, state, "abort-safety", 1) > 0) {
+		if (get_sha1_hex(sb.buf, abort_safety))
+			die(_("could not parse %s"), am_path(state, "abort_safety"));
+	} else
+		hashclr(abort_safety);
+
+	if (get_sha1("HEAD", head))
+		hashclr(head);
+
+	if (!hashcmp(head, abort_safety))
+		return 1;
+
+	error(_("You seem to have moved HEAD since the last 'am' failure.\n"
+		"Not rewinding to ORIG_HEAD"));
+
+	return 0;
+}
+
+/**
+ * Aborts the current am session if it is safe to do so.
+ */
+static void am_abort(struct am_state *state)
+{
+	unsigned char curr_head[GIT_SHA1_RAWSZ], orig_head[GIT_SHA1_RAWSZ];
+	int has_curr_head, has_orig_head;
+	const char *curr_branch;
+
+	if (!safe_to_abort(state)) {
+		am_destroy(state);
+		return;
+	}
+
+	curr_branch = resolve_refdup("HEAD", 0, curr_head, NULL);
+	has_curr_head = !is_null_sha1(curr_head);
+	if (!has_curr_head)
+		hashcpy(curr_head, EMPTY_TREE_SHA1_BIN);
+
+	has_orig_head = !get_sha1("ORIG_HEAD", orig_head);
+	if (!has_orig_head)
+		hashcpy(orig_head, EMPTY_TREE_SHA1_BIN);
+
+	clean_index(curr_head, orig_head);
+
+	if (has_orig_head)
+		update_ref("am --abort", "HEAD", orig_head,
+				has_curr_head ? curr_head : NULL, 0,
+				UPDATE_REFS_DIE_ON_ERR);
+	else if (curr_branch)
+		delete_ref(curr_branch, NULL, REF_NODEREF);
+
+	am_destroy(state);
+}
+
+/**
  * parse_options() callback that validates and sets opt->value to the
  * PATCH_FORMAT_* enum value corresponding to `arg`.
  */
@@ -999,7 +1088,8 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
 enum resume_mode {
 	RESUME_FALSE = 0,
 	RESUME_RESOLVED,
-	RESUME_SKIP
+	RESUME_SKIP,
+	RESUME_ABORT
 };
 
 int cmd_am(int argc, const char **argv, const char *prefix)
@@ -1010,7 +1100,7 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 
 	const char * const usage[] = {
 		N_("git am [options] [(<mbox>|<Maildir>)...]"),
-		N_("git am [options] (--continue | --skip)"),
+		N_("git am [options] (--continue | --skip | --abort)"),
 		NULL
 	};
 
@@ -1027,6 +1117,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_CMDMODE(0, "skip", &resume,
 			N_("skip the current patch"),
 			RESUME_SKIP),
+		OPT_CMDMODE(0, "abort", &resume,
+			N_("restore the original branch and abort the patching operation."),
+			RESUME_ABORT),
 		OPT_END()
 	};
 
@@ -1085,6 +1178,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 	case RESUME_SKIP:
 		am_skip(&state);
 		break;
+	case RESUME_ABORT:
+		am_abort(&state);
+		break;
 	default:
 		die("BUG: invalid resume value");
 	}
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 14/44] builtin-am: reject patches when there's a session in progress
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (12 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 13/44] builtin-am: implement --abort Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 15/44] builtin-am: implement -q/--quiet Paul Tan
                   ` (32 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07), git-am
would error out if the user gave it mbox(s) on the command-line, but
there was a session in progress.

Since c95b138 (Fix git-am safety checks, 2006-09-15), git-am would
detect if the user attempted to feed it a mbox via stdin, by checking if
stdin is not a tty and there is no resume command given.

Re-implement the above two safety checks.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 1db95f2..e066a97 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1147,9 +1147,24 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 	if (read_index_preload(&the_index, NULL) < 0)
 		die(_("failed to read the index"));
 
-	if (am_in_progress(&state))
+	if (am_in_progress(&state)) {
+		/*
+		 * Catch user error to feed us patches when there is a session
+		 * in progress:
+		 *
+		 * 1. mbox path(s) are provided on the command-line.
+		 * 2. stdin is not a tty: the user is trying to feed us a patch
+		 *    from standard input. This is somewhat unreliable -- stdin
+		 *    could be /dev/null for example and the caller did not
+		 *    intend to feed us a patch but wanted to continue
+		 *    unattended.
+		 */
+		if (argc || (resume == RESUME_FALSE && !isatty(0)))
+			die(_("previous rebase directory %s still exists but mbox given."),
+				state.dir);
+
 		am_load(&state);
-	else {
+	} else {
 		struct argv_array paths = ARGV_ARRAY_INIT;
 		int i;
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 15/44] builtin-am: implement -q/--quiet
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (13 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 14/44] builtin-am: reject patches when there's a session in progress Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 16/44] builtin-am: exit with user friendly message on failure Paul Tan
                   ` (31 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 0e987a1 (am, rebase: teach quiet option, 2009-06-16), git-am
supported the --quiet option, and when told to be quiet, would only
speak on failure. Re-implement this by introducing the say() function,
which works like fprintf_ln(), but would only write to the stream when
state->quiet is false.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * Removed GIT_QUIET environment variable, as it turns out
      git-sh-setup.sh will reset it, which means the user's environment
      cannot affect it.

 builtin/am.c | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index e066a97..61c2ad3 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -80,6 +80,8 @@ struct am_state {
 
 	/* number of digits in patch filename */
 	int prec;
+
+	int quiet;
 };
 
 /**
@@ -128,6 +130,22 @@ static inline const char *am_path(const struct am_state *state, const char *path
 }
 
 /**
+ * If state->quiet is false, calls fprintf(fp, fmt, ...), and appends a newline
+ * at the end.
+ */
+static void say(const struct am_state *state, FILE *fp, const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	if (!state->quiet) {
+		vfprintf(fp, fmt, ap);
+		putc('\n', fp);
+	}
+	va_end(ap);
+}
+
+/**
  * Returns 1 if there is an am session in progress, 0 otherwise.
  */
 static int am_in_progress(const struct am_state *state)
@@ -347,6 +365,9 @@ static void am_load(struct am_state *state)
 
 	read_commit_msg(state);
 
+	read_state_file(&sb, state, "quiet", 1);
+	state->quiet = !strcmp(sb.buf, "t");
+
 	strbuf_release(&sb);
 }
 
@@ -525,6 +546,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 		die(_("Failed to split patches."));
 	}
 
+	write_file(am_path(state, "quiet"), 1, state->quiet ? "t" : "f");
+
 	if (!get_sha1("HEAD", curr_head)) {
 		write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(curr_head));
 		update_ref("am", "ORIG_HEAD", curr_head, NULL, 0, UPDATE_REFS_DIE_ON_ERR);
@@ -778,7 +801,7 @@ static void do_commit(const struct am_state *state)
 		commit_list_insert(lookup_commit(parent), &parents);
 	} else {
 		ptr = NULL;
-		fprintf_ln(stderr, _("applying to an empty history"));
+		say(state, stderr, _("applying to an empty history"));
 	}
 
 	author = fmt_ident(state->author_name, state->author_email,
@@ -831,7 +854,7 @@ static void am_run(struct am_state *state)
 		write_author_script(state);
 		write_commit_msg(state);
 
-		printf_ln(_("Applying: %.*s"), linelen(state->msg), state->msg);
+		say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
 
 		if (run_apply(state) < 0) {
 			int advice_amworkdir = 1;
@@ -873,7 +896,7 @@ static void am_resolve(struct am_state *state)
 		die(_("cannot resume: %s does not exist."),
 			am_path(state, "author-script"));
 
-	printf_ln(_("Applying: %.*s"), linelen(state->msg), state->msg);
+	say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
 
 	if (!index_has_changes(NULL)) {
 		printf_ln(_("No changes - did you forget to use 'git add'?\n"
@@ -1105,6 +1128,7 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 	};
 
 	struct option options[] = {
+		OPT__QUIET(&state.quiet, N_("be quiet")),
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 16/44] builtin-am: exit with user friendly message on failure
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (14 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 15/44] builtin-am: implement -q/--quiet Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 17/44] builtin-am: implement -s/--signoff Paul Tan
                   ` (30 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since ced9456 (Give the user a hint for how to continue in the case that
git-am fails because it requires user intervention, 2006-05-02), git-am
prints additional information on how the user can re-invoke git-am to
resume patch application after resolving the failure. Re-implement this
through the die_user_resolve() function.

Since cc12005 (Make git rebase interactive help match documentation.,
2006-05-13), git-am supports the --resolvemsg option which is used by
git-rebase to override the message printed out when git-am fails.
Re-implement this option.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 61c2ad3..7eb23b9 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -82,6 +82,9 @@ struct am_state {
 	int prec;
 
 	int quiet;
+
+	/* override error message when patch failure occurs */
+	const char *resolvemsg;
 };
 
 /**
@@ -668,6 +671,25 @@ static int index_has_changes(struct strbuf *sb)
 }
 
 /**
+ * Dies with a user-friendly message on how to proceed after resolving the
+ * problem. This message can be overridden with state->resolvemsg.
+ */
+static void NORETURN die_user_resolve(const struct am_state *state)
+{
+	if (state->resolvemsg) {
+		printf_ln("%s", state->resolvemsg);
+	} else {
+		const char *cmdline = "git am";
+
+		printf_ln(_("When you have resolved this problem, run \"%s --continue\"."), cmdline);
+		printf_ln(_("If you prefer to skip this patch, run \"%s --skip\" instead."), cmdline);
+		printf_ln(_("To restore the original branch and stop patching, run \"%s --abort\"."), cmdline);
+	}
+
+	exit(128);
+}
+
+/**
  * Parses `mail` using git-mailinfo, extracting its patch and authorship info.
  * state->msg will be set to the patch message. state->author_name,
  * state->author_email and state->author_date will be set to the patch author's
@@ -727,7 +749,7 @@ static int parse_mail(struct am_state *state, const char *mail)
 
 	if (is_empty_file(am_path(state, "patch"))) {
 		printf_ln(_("Patch is empty. Was it split wrong?"));
-		exit(128);
+		die_user_resolve(state);
 	}
 
 	strbuf_addstr(&msg, "\n\n");
@@ -868,7 +890,7 @@ static void am_run(struct am_state *state)
 				printf_ln(_("The copy of the patch that failed is found in: %s"),
 						am_path(state, "patch"));
 
-			exit(128);
+			die_user_resolve(state);
 		}
 
 		do_commit(state);
@@ -902,13 +924,13 @@ static void am_resolve(struct am_state *state)
 		printf_ln(_("No changes - did you forget to use 'git add'?\n"
 			"If there is nothing left to stage, chances are that something else\n"
 			"already introduced the same changes; you might want to skip this patch."));
-		exit(128);
+		die_user_resolve(state);
 	}
 
 	if (unmerged_cache()) {
 		printf_ln(_("You still have unmerged paths in your index.\n"
 			"Did you forget to use 'git add'?"));
-		exit(128);
+		die_user_resolve(state);
 	}
 
 	do_commit(state);
@@ -1132,6 +1154,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
+		OPT_STRING(0, "resolvemsg", &state.resolvemsg, NULL,
+			N_("override error message when patch failure occurs")),
 		OPT_CMDMODE(0, "continue", &resume,
 			N_("continue applying patches after resolving a conflict"),
 			RESUME_RESOLVED),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 17/44] builtin-am: implement -s/--signoff
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (15 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 16/44] builtin-am: exit with user friendly message on failure Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 18/44] cache-tree: introduce write_index_as_tree() Paul Tan
                   ` (29 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07), git-am
supported the --signoff option which will append a signoff at the end of
the commit messsage. Re-implement this feature in parse_mail() by
calling append_signoff() if the option is set.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 7eb23b9..511e4dd 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -18,6 +18,7 @@
 #include "diffcore.h"
 #include "unpack-trees.h"
 #include "branch.h"
+#include "sequencer.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -83,6 +84,8 @@ struct am_state {
 
 	int quiet;
 
+	int append_signoff;
+
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
 };
@@ -371,6 +374,9 @@ static void am_load(struct am_state *state)
 	read_state_file(&sb, state, "quiet", 1);
 	state->quiet = !strcmp(sb.buf, "t");
 
+	read_state_file(&sb, state, "sign", 1);
+	state->append_signoff = !strcmp(sb.buf, "t");
+
 	strbuf_release(&sb);
 }
 
@@ -551,6 +557,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 
 	write_file(am_path(state, "quiet"), 1, state->quiet ? "t" : "f");
 
+	write_file(am_path(state, "sign"), 1, state->append_signoff ? "t" : "f");
+
 	if (!get_sha1("HEAD", curr_head)) {
 		write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(curr_head));
 		update_ref("am", "ORIG_HEAD", curr_head, NULL, 0, UPDATE_REFS_DIE_ON_ERR);
@@ -757,6 +765,9 @@ static int parse_mail(struct am_state *state, const char *mail)
 		die_errno(_("could not read '%s'"), am_path(state, "msg"));
 	stripspace(&msg, 0);
 
+	if (state->append_signoff)
+		append_signoff(&msg, 0, 0);
+
 	assert(!state->author_name);
 	state->author_name = strbuf_detach(&author_name, NULL);
 
@@ -1151,6 +1162,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 
 	struct option options[] = {
 		OPT__QUIET(&state.quiet, N_("be quiet")),
+		OPT_BOOL('s', "signoff", &state.append_signoff,
+			N_("add a Signed-off-by line to the commit message")),
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 18/44] cache-tree: introduce write_index_as_tree()
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (16 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 17/44] builtin-am: implement -s/--signoff Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 20:10   ` Junio C Hamano
  2015-07-07 14:20 ` [PATCH v5 19/44] builtin-am: implement --3way, am.threeWay Paul Tan
                   ` (28 subsequent siblings)
  46 siblings, 1 reply; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

A caller may wish to write a temporary index as a tree. However,
write_cache_as_tree() assumes that the index was read from, and will
write to, the default index file path. Introduce write_index_as_tree()
which removes this limitation by allowing the caller to specify its own
index_state and index file path.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 cache-tree.c | 29 +++++++++++++++++------------
 cache-tree.h |  1 +
 2 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/cache-tree.c b/cache-tree.c
index 32772b9..feace8b 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -592,7 +592,7 @@ static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *pat
 	return it;
 }
 
-int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix)
+int write_index_as_tree(unsigned char *sha1, struct index_state *index_state, const char *index_path, int flags, const char *prefix)
 {
 	int entries, was_valid, newfd;
 	struct lock_file *lock_file;
@@ -603,23 +603,23 @@ int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix)
 	 */
 	lock_file = xcalloc(1, sizeof(struct lock_file));
 
-	newfd = hold_locked_index(lock_file, 1);
+	newfd = hold_lock_file_for_update(lock_file, index_path, LOCK_DIE_ON_ERROR);
 
-	entries = read_cache();
+	entries = read_index_from(index_state, index_path);
 	if (entries < 0)
 		return WRITE_TREE_UNREADABLE_INDEX;
 	if (flags & WRITE_TREE_IGNORE_CACHE_TREE)
-		cache_tree_free(&(active_cache_tree));
+		cache_tree_free(&index_state->cache_tree);
 
-	if (!active_cache_tree)
-		active_cache_tree = cache_tree();
+	if (!index_state->cache_tree)
+		index_state->cache_tree = cache_tree();
 
-	was_valid = cache_tree_fully_valid(active_cache_tree);
+	was_valid = cache_tree_fully_valid(index_state->cache_tree);
 	if (!was_valid) {
-		if (cache_tree_update(&the_index, flags) < 0)
+		if (cache_tree_update(index_state, flags) < 0)
 			return WRITE_TREE_UNMERGED_INDEX;
 		if (0 <= newfd) {
-			if (!write_locked_index(&the_index, lock_file, COMMIT_LOCK))
+			if (!write_locked_index(index_state, lock_file, COMMIT_LOCK))
 				newfd = -1;
 		}
 		/* Not being able to write is fine -- we are only interested
@@ -631,14 +631,14 @@ int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix)
 	}
 
 	if (prefix) {
-		struct cache_tree *subtree =
-			cache_tree_find(active_cache_tree, prefix);
+		struct cache_tree *subtree;
+		subtree = cache_tree_find(index_state->cache_tree, prefix);
 		if (!subtree)
 			return WRITE_TREE_PREFIX_ERROR;
 		hashcpy(sha1, subtree->sha1);
 	}
 	else
-		hashcpy(sha1, active_cache_tree->sha1);
+		hashcpy(sha1, index_state->cache_tree->sha1);
 
 	if (0 <= newfd)
 		rollback_lock_file(lock_file);
@@ -646,6 +646,11 @@ int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix)
 	return 0;
 }
 
+int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix)
+{
+	return write_index_as_tree(sha1, &the_index, get_index_file(), flags, prefix);
+}
+
 static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
 {
 	struct tree_desc desc;
diff --git a/cache-tree.h b/cache-tree.h
index aa7b3e4..41c5746 100644
--- a/cache-tree.h
+++ b/cache-tree.h
@@ -46,6 +46,7 @@ int update_main_cache_tree(int);
 #define WRITE_TREE_UNMERGED_INDEX (-2)
 #define WRITE_TREE_PREFIX_ERROR (-3)
 
+int write_index_as_tree(unsigned char *sha1, struct index_state *index_state, const char *index_path, int flags, const char *prefix);
 int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix);
 void prime_cache_tree(struct index_state *, struct tree *);
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 19/44] builtin-am: implement --3way, am.threeWay
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (17 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 18/44] cache-tree: introduce write_index_as_tree() Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 20:14   ` Junio C Hamano
  2015-07-07 14:20 ` [PATCH v5 20/44] builtin-am: implement --rebasing mode Paul Tan
                   ` (27 subsequent siblings)
  46 siblings, 1 reply; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07),
git-am.sh supported the --3way option, and if set, would attempt to do a
3-way merge if the initial patch application fails.

Since d96a275 (git-am: add am.threeWay config variable, 2015-06-04), the
setting am.threeWay configures if the --3way option is set by default.

Since 5d86861 (am -3: list the paths that needed 3-way fallback,
2012-03-28), in a 3-way merge git-am.sh would list the paths that needed
3-way fallback, so that the user can review them more carefully to spot
mismerges.

Re-implement the above in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * s/a index/an index/

 builtin/am.c | 157 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 153 insertions(+), 4 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 511e4dd..af22c35 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -19,6 +19,8 @@
 #include "unpack-trees.h"
 #include "branch.h"
 #include "sequencer.h"
+#include "revision.h"
+#include "merge-recursive.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -82,6 +84,8 @@ struct am_state {
 	/* number of digits in patch filename */
 	int prec;
 
+	int threeway;
+
 	int quiet;
 
 	int append_signoff;
@@ -102,6 +106,8 @@ static void am_state_init(struct am_state *state, const char *dir)
 	state->dir = xstrdup(dir);
 
 	state->prec = 4;
+
+	git_config_get_bool("am.threeway", &state->threeway);
 }
 
 /**
@@ -371,6 +377,9 @@ static void am_load(struct am_state *state)
 
 	read_commit_msg(state);
 
+	read_state_file(&sb, state, "threeway", 1);
+	state->threeway = !strcmp(sb.buf, "t");
+
 	read_state_file(&sb, state, "quiet", 1);
 	state->quiet = !strcmp(sb.buf, "t");
 
@@ -555,6 +564,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 		die(_("Failed to split patches."));
 	}
 
+	write_file(am_path(state, "threeway"), 1, state->threeway ? "t" : "f");
+
 	write_file(am_path(state, "quiet"), 1, state->quiet ? "t" : "f");
 
 	write_file(am_path(state, "sign"), 1, state->append_signoff ? "t" : "f");
@@ -790,16 +801,34 @@ finish:
 }
 
 /**
- * Applies current patch with git-apply. Returns 0 on success, -1 otherwise.
+ * Applies current patch with git-apply. Returns 0 on success, -1 otherwise. If
+ * `index_file` is not NULL, the patch will be applied to that index.
  */
-static int run_apply(const struct am_state *state)
+static int run_apply(const struct am_state *state, const char *index_file)
 {
 	struct child_process cp = CHILD_PROCESS_INIT;
 
 	cp.git_cmd = 1;
 
+	if (index_file)
+		argv_array_pushf(&cp.env_array, "GIT_INDEX_FILE=%s", index_file);
+
+	/*
+	 * If we are allowed to fall back on 3-way merge, don't give false
+	 * errors during the initial attempt.
+	 */
+	if (state->threeway && !index_file) {
+		cp.no_stdout = 1;
+		cp.no_stderr = 1;
+	}
+
 	argv_array_push(&cp.args, "apply");
-	argv_array_push(&cp.args, "--index");
+
+	if (index_file)
+		argv_array_push(&cp.args, "--cached");
+	else
+		argv_array_push(&cp.args, "--index");
+
 	argv_array_push(&cp.args, am_path(state, "patch"));
 
 	if (run_command(&cp))
@@ -807,8 +836,106 @@ static int run_apply(const struct am_state *state)
 
 	/* Reload index as git-apply will have modified it. */
 	discard_cache();
+	read_cache_from(index_file ? index_file : get_index_file());
+
+	return 0;
+}
+
+/**
+ * Builds an index that contains just the blobs needed for a 3way merge.
+ */
+static int build_fake_ancestor(const struct am_state *state, const char *index_file)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+
+	cp.git_cmd = 1;
+	argv_array_push(&cp.args, "apply");
+	argv_array_pushf(&cp.args, "--build-fake-ancestor=%s", index_file);
+	argv_array_push(&cp.args, am_path(state, "patch"));
+
+	if (run_command(&cp))
+		return -1;
+
+	return 0;
+}
+
+/**
+ * Attempt a threeway merge, using index_path as the temporary index.
+ */
+static int fall_back_threeway(const struct am_state *state, const char *index_path)
+{
+	unsigned char orig_tree[GIT_SHA1_RAWSZ], his_tree[GIT_SHA1_RAWSZ],
+		      our_tree[GIT_SHA1_RAWSZ];
+	const unsigned char *bases[1] = {orig_tree};
+	struct merge_options o;
+	struct commit *result;
+	char *his_tree_name;
+
+	if (get_sha1("HEAD", our_tree) < 0)
+		hashcpy(our_tree, EMPTY_TREE_SHA1_BIN);
+
+	if (build_fake_ancestor(state, index_path))
+		return error("could not build fake ancestor");
+
+	discard_cache();
+	read_cache_from(index_path);
+
+	if (write_index_as_tree(orig_tree, &the_index, index_path, 0, NULL))
+		return error(_("Repository lacks necessary blobs to fall back on 3-way merge."));
+
+	say(state, stdout, _("Using index info to reconstruct a base tree..."));
+
+	if (!state->quiet) {
+		/*
+		 * List paths that needed 3-way fallback, so that the user can
+		 * review them with extra care to spot mismerges.
+		 */
+		struct rev_info rev_info;
+		const char *diff_filter_str = "--diff-filter=AM";
+
+		init_revisions(&rev_info, NULL);
+		rev_info.diffopt.output_format = DIFF_FORMAT_NAME_STATUS;
+		diff_opt_parse(&rev_info.diffopt, &diff_filter_str, 1);
+		add_pending_sha1(&rev_info, "HEAD", our_tree, 0);
+		diff_setup_done(&rev_info.diffopt);
+		run_diff_index(&rev_info, 1);
+	}
+
+	if (run_apply(state, index_path))
+		return error(_("Did you hand edit your patch?\n"
+				"It does not apply to blobs recorded in its index."));
+
+	if (write_index_as_tree(his_tree, &the_index, index_path, 0, NULL))
+		return error("could not write tree");
+
+	say(state, stdout, _("Falling back to patching base and 3-way merge..."));
+
+	discard_cache();
 	read_cache();
 
+	/*
+	 * This is not so wrong. Depending on which base we picked, orig_tree
+	 * may be wildly different from ours, but his_tree has the same set of
+	 * wildly different changes in parts the patch did not touch, so
+	 * recursive ends up canceling them, saying that we reverted all those
+	 * changes.
+	 */
+
+	init_merge_options(&o);
+
+	o.branch1 = "HEAD";
+	his_tree_name = xstrfmt("%.*s", linelen(state->msg), state->msg);
+	o.branch2 = his_tree_name;
+
+	if (state->quiet)
+		o.verbosity = 0;
+
+	if (merge_recursive_generic(&o, our_tree, his_tree, 1, bases, &result)) {
+		free(his_tree_name);
+		return error(_("Failed to merge in the changes."));
+	}
+
+	free(his_tree_name);
 	return 0;
 }
 
@@ -877,6 +1004,7 @@ static void am_run(struct am_state *state)
 
 	while (state->cur <= state->last) {
 		const char *mail = am_path(state, msgnum(state));
+		int apply_status;
 
 		if (!file_exists(mail))
 			goto next;
@@ -889,7 +1017,26 @@ static void am_run(struct am_state *state)
 
 		say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
 
-		if (run_apply(state) < 0) {
+		apply_status = run_apply(state, NULL);
+
+		if (apply_status && state->threeway) {
+			struct strbuf sb = STRBUF_INIT;
+
+			strbuf_addstr(&sb, am_path(state, "patch-merge-index"));
+			apply_status = fall_back_threeway(state, sb.buf);
+			strbuf_release(&sb);
+
+			/*
+			 * Applying the patch to an earlier tree and merging
+			 * the result may have produced the same tree as ours.
+			 */
+			if (!apply_status && !index_has_changes(NULL)) {
+				say(state, stdout, _("No changes -- Patch already applied."));
+				goto next;
+			}
+		}
+
+		if (apply_status) {
 			int advice_amworkdir = 1;
 
 			printf_ln(_("Patch failed at %s %.*s"), msgnum(state),
@@ -1161,6 +1308,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 	};
 
 	struct option options[] = {
+		OPT_BOOL('3', "3way", &state.threeway,
+			N_("allow fall back on 3way merging if needed")),
 		OPT__QUIET(&state.quiet, N_("be quiet")),
 		OPT_BOOL('s', "signoff", &state.append_signoff,
 			N_("add a Signed-off-by line to the commit message")),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 20/44] builtin-am: implement --rebasing mode
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (18 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 19/44] builtin-am: implement --3way, am.threeWay Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 21/44] builtin-am: bypass git-mailinfo when --rebasing Paul Tan
                   ` (26 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 3041c32 (am: --rebasing, 2008-03-04), git-am.sh supported the
--rebasing option, which is used internally by git-rebase to tell git-am
that it is being used for its purpose. It would create the empty file
$state_dir/rebasing to help "completion" scripts tell if the ongoing
operation is am or rebase.

As of 0fbb95d (am: don't call mailinfo if $rebasing, 2012-06-26),
--rebasing also implies --3way as well.

Since a1549e1 (am: return control to caller, for housekeeping,
2013-05-12), git-am.sh would only clean up the state directory when it
is not --rebasing, instead deferring cleanup to git-rebase.sh.

Re-implement the above in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index af22c35..b68dcc5 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -92,6 +92,8 @@ struct am_state {
 
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
+
+	int rebasing;
 };
 
 /**
@@ -386,6 +388,8 @@ static void am_load(struct am_state *state)
 	read_state_file(&sb, state, "sign", 1);
 	state->append_signoff = !strcmp(sb.buf, "t");
 
+	state->rebasing = !!file_exists(am_path(state, "rebasing"));
+
 	strbuf_release(&sb);
 }
 
@@ -564,18 +568,29 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 		die(_("Failed to split patches."));
 	}
 
+	if (state->rebasing)
+		state->threeway = 1;
+
 	write_file(am_path(state, "threeway"), 1, state->threeway ? "t" : "f");
 
 	write_file(am_path(state, "quiet"), 1, state->quiet ? "t" : "f");
 
 	write_file(am_path(state, "sign"), 1, state->append_signoff ? "t" : "f");
 
+	if (state->rebasing)
+		write_file(am_path(state, "rebasing"), 1, "%s", "");
+	else
+		write_file(am_path(state, "applying"), 1, "%s", "");
+
 	if (!get_sha1("HEAD", curr_head)) {
 		write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(curr_head));
-		update_ref("am", "ORIG_HEAD", curr_head, NULL, 0, UPDATE_REFS_DIE_ON_ERR);
+		if (!state->rebasing)
+			update_ref("am", "ORIG_HEAD", curr_head, NULL, 0,
+					UPDATE_REFS_DIE_ON_ERR);
 	} else {
 		write_file(am_path(state, "abort-safety"), 1, "%s", "");
-		delete_ref("ORIG_HEAD", NULL, 0);
+		if (!state->rebasing)
+			delete_ref("ORIG_HEAD", NULL, 0);
 	}
 
 	/*
@@ -1057,8 +1072,14 @@ next:
 		am_next(state);
 	}
 
-	am_destroy(state);
-	run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
+	/*
+	 * In rebasing mode, it's up to the caller to take care of
+	 * housekeeping.
+	 */
+	if (!state->rebasing) {
+		am_destroy(state);
+		run_command_v_opt(argv_gc_auto, RUN_GIT_CMD);
+	}
 }
 
 /**
@@ -1330,6 +1351,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_CMDMODE(0, "abort", &resume,
 			N_("restore the original branch and abort the patching operation."),
 			RESUME_ABORT),
+		OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
+			N_("(internal use for git-rebase)")),
 		OPT_END()
 	};
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 21/44] builtin-am: bypass git-mailinfo when --rebasing
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (19 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 20/44] builtin-am: implement --rebasing mode Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 22/44] builtin-am: handle stray state directory Paul Tan
                   ` (25 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 5e835ca (rebase: do not munge commit log message, 2008-04-16),
git am --rebasing no longer gets the commit log message from the patch,
but reads it directly from the commit identified by the "From " header
line.

Since 43c2325 (am: use get_author_ident_from_commit instead of mailinfo
when rebasing, 2010-06-16), git am --rebasing also gets the author name,
email and date directly from the commit.

Since 0fbb95d (am: don't call mailinfo if $rebasing, 2012-06-26), git am
--rebasing does not use git-mailinfo to get the patch body, but rather
generates it directly from the commit itself.

The above 3 commits introduced a separate parse_mail() code path in
git-am.sh's --rebasing mode that bypasses git-mailinfo. Re-implement
this code path in builtin/am.c as parse_mail_rebase().

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 132 insertions(+), 2 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index b68dcc5..06ded5d 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -21,6 +21,8 @@
 #include "sequencer.h"
 #include "revision.h"
 #include "merge-recursive.h"
+#include "revision.h"
+#include "log-tree.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -816,6 +818,129 @@ finish:
 }
 
 /**
+ * Sets commit_id to the commit hash where the mail was generated from.
+ * Returns 0 on success, -1 on failure.
+ */
+static int get_mail_commit_sha1(unsigned char *commit_id, const char *mail)
+{
+	struct strbuf sb = STRBUF_INIT;
+	FILE *fp = xfopen(mail, "r");
+	const char *x;
+
+	if (strbuf_getline(&sb, fp, '\n'))
+		return -1;
+
+	if (!skip_prefix(sb.buf, "From ", &x))
+		return -1;
+
+	if (get_sha1_hex(x, commit_id) < 0)
+		return -1;
+
+	strbuf_release(&sb);
+	fclose(fp);
+	return 0;
+}
+
+/**
+ * Sets state->msg, state->author_name, state->author_email, state->author_date
+ * to the commit's respective info.
+ */
+static void get_commit_info(struct am_state *state, struct commit *commit)
+{
+	const char *buffer, *ident_line, *author_date, *msg;
+	size_t ident_len;
+	struct ident_split ident_split;
+	struct strbuf sb = STRBUF_INIT;
+
+	buffer = logmsg_reencode(commit, NULL, get_commit_output_encoding());
+
+	ident_line = find_commit_header(buffer, "author", &ident_len);
+
+	if (split_ident_line(&ident_split, ident_line, ident_len) < 0) {
+		strbuf_add(&sb, ident_line, ident_len);
+		die(_("invalid ident line: %s"), sb.buf);
+	}
+
+	assert(!state->author_name);
+	if (ident_split.name_begin) {
+		strbuf_add(&sb, ident_split.name_begin,
+			ident_split.name_end - ident_split.name_begin);
+		state->author_name = strbuf_detach(&sb, NULL);
+	} else
+		state->author_name = xstrdup("");
+
+	assert(!state->author_email);
+	if (ident_split.mail_begin) {
+		strbuf_add(&sb, ident_split.mail_begin,
+			ident_split.mail_end - ident_split.mail_begin);
+		state->author_email = strbuf_detach(&sb, NULL);
+	} else
+		state->author_email = xstrdup("");
+
+	author_date = show_ident_date(&ident_split, DATE_NORMAL);
+	strbuf_addstr(&sb, author_date);
+	assert(!state->author_date);
+	state->author_date = strbuf_detach(&sb, NULL);
+
+	assert(!state->msg);
+	msg = strstr(buffer, "\n\n");
+	if (!msg)
+		die(_("unable to parse commit %s"), sha1_to_hex(commit->object.sha1));
+	state->msg = xstrdup(msg + 2);
+	state->msg_len = strlen(state->msg);
+}
+
+/**
+ * Writes `commit` as a patch to the state directory's "patch" file.
+ */
+static void write_commit_patch(const struct am_state *state, struct commit *commit)
+{
+	struct rev_info rev_info;
+	FILE *fp;
+
+	fp = xfopen(am_path(state, "patch"), "w");
+	init_revisions(&rev_info, NULL);
+	rev_info.diff = 1;
+	rev_info.abbrev = 0;
+	rev_info.disable_stdin = 1;
+	rev_info.show_root_diff = 1;
+	rev_info.diffopt.output_format = DIFF_FORMAT_PATCH;
+	rev_info.no_commit_id = 1;
+	DIFF_OPT_SET(&rev_info.diffopt, BINARY);
+	DIFF_OPT_SET(&rev_info.diffopt, FULL_INDEX);
+	rev_info.diffopt.use_color = 0;
+	rev_info.diffopt.file = fp;
+	rev_info.diffopt.close_file = 1;
+	add_pending_object(&rev_info, &commit->object, "");
+	diff_setup_done(&rev_info.diffopt);
+	log_tree_commit(&rev_info, commit);
+}
+
+/**
+ * Like parse_mail(), but parses the mail by looking up its commit ID
+ * directly. This is used in --rebasing mode to bypass git-mailinfo's munging
+ * of patches.
+ *
+ * Will always return 0 as the patch should never be skipped.
+ */
+static int parse_mail_rebase(struct am_state *state, const char *mail)
+{
+	struct commit *commit;
+	unsigned char commit_sha1[GIT_SHA1_RAWSZ];
+
+	if (get_mail_commit_sha1(commit_sha1, mail) < 0)
+		die(_("could not parse %s"), mail);
+
+	commit = lookup_commit_or_die(commit_sha1, mail);
+
+	get_commit_info(state, commit);
+
+	write_commit_patch(state, commit);
+
+	return 0;
+}
+
+/**
  * Applies current patch with git-apply. Returns 0 on success, -1 otherwise. If
  * `index_file` is not NULL, the patch will be applied to that index.
  */
@@ -1019,12 +1144,17 @@ static void am_run(struct am_state *state)
 
 	while (state->cur <= state->last) {
 		const char *mail = am_path(state, msgnum(state));
-		int apply_status;
+		int apply_status, skip;
 
 		if (!file_exists(mail))
 			goto next;
 
-		if (parse_mail(state, mail))
+		if (state->rebasing)
+			skip = parse_mail_rebase(state, mail);
+		else
+			skip = parse_mail(state, mail);
+
+		if (skip)
 			goto next; /* mail should be skipped */
 
 		write_author_script(state);
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 22/44] builtin-am: handle stray state directory
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (20 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 21/44] builtin-am: bypass git-mailinfo when --rebasing Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 23/44] builtin-am: implement -u/--utf8 Paul Tan
                   ` (24 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Should git-am terminate unexpectedly between the point where the state
directory is created, but the "next" and "last" files are not written
yet, a stray state directory will be left behind.

As such, since b141f3c (am: handle stray $dotest directory, 2013-06-15),
git-am.sh explicitly recognizes such a stray directory, and allows the
user to remove it with am --abort.

Re-implement this feature in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 06ded5d..c92bff4 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1531,6 +1531,23 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		struct argv_array paths = ARGV_ARRAY_INIT;
 		int i;
 
+		/*
+		 * Handle stray state directory in the independent-run case. In
+		 * the --rebasing case, it is up to the caller to take care of
+		 * stray directories.
+		 */
+		if (file_exists(state.dir) && !state.rebasing) {
+			if (resume == RESUME_ABORT) {
+				am_destroy(&state);
+				am_state_release(&state);
+				return 0;
+			}
+
+			die(_("Stray %s directory found.\n"
+				"Use \"git am --abort\" to remove it."),
+				state.dir);
+		}
+
 		if (resume)
 			die(_("Resolve operation not in progress, we are not resuming."));
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 23/44] builtin-am: implement -u/--utf8
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (21 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 22/44] builtin-am: handle stray state directory Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 24/44] builtin-am: implement -k/--keep, --keep-non-patch Paul Tan
                   ` (23 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07),
git-am.sh supported the -u,--utf8 option. If set, the -u option will be
passed to git-mailinfo to re-code the commit log message and authorship
in the charset specified by i18n.commitencoding. If unset, the -n option
will be passed to git-mailinfo, which disables the re-encoding.

Since d84029b (--utf8 is now default for 'git-am', 2007-01-08), --utf8
is specified by default in git-am.sh.

Re-implement the above in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index c92bff4..0b441fb 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -92,6 +92,8 @@ struct am_state {
 
 	int append_signoff;
 
+	int utf8;
+
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
 
@@ -112,6 +114,8 @@ static void am_state_init(struct am_state *state, const char *dir)
 	state->prec = 4;
 
 	git_config_get_bool("am.threeway", &state->threeway);
+
+	state->utf8 = 1;
 }
 
 /**
@@ -390,6 +394,9 @@ static void am_load(struct am_state *state)
 	read_state_file(&sb, state, "sign", 1);
 	state->append_signoff = !strcmp(sb.buf, "t");
 
+	read_state_file(&sb, state, "utf8", 1);
+	state->utf8 = !strcmp(sb.buf, "t");
+
 	state->rebasing = !!file_exists(am_path(state, "rebasing"));
 
 	strbuf_release(&sb);
@@ -579,6 +586,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 
 	write_file(am_path(state, "sign"), 1, state->append_signoff ? "t" : "f");
 
+	write_file(am_path(state, "utf8"), 1, state->utf8 ? "t" : "f");
+
 	if (state->rebasing)
 		write_file(am_path(state, "rebasing"), 1, "%s", "");
 	else
@@ -750,6 +759,7 @@ static int parse_mail(struct am_state *state, const char *mail)
 	cp.out = xopen(am_path(state, "info"), O_WRONLY | O_CREAT, 0777);
 
 	argv_array_push(&cp.args, "mailinfo");
+	argv_array_push(&cp.args, state->utf8 ? "-u" : "-n");
 	argv_array_push(&cp.args, am_path(state, "msg"));
 	argv_array_push(&cp.args, am_path(state, "patch"));
 
@@ -1464,6 +1474,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT__QUIET(&state.quiet, N_("be quiet")),
 		OPT_BOOL('s', "signoff", &state.append_signoff,
 			N_("add a Signed-off-by line to the commit message")),
+		OPT_BOOL('u', "utf8", &state.utf8,
+			N_("recode into utf8 (default)")),
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 24/44] builtin-am: implement -k/--keep, --keep-non-patch
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (22 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 23/44] builtin-am: implement -u/--utf8 Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 25/44] builtin-am: implement --[no-]message-id, am.messageid Paul Tan
                   ` (22 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07),
git-am.sh supported the -k/--keep option to pass the -k option to
git-mailsplit.

Since f7e5ea1 (am: learn passing -b to mailinfo, 2012-01-16), git-am.sh
supported the --keep-non-patch option to pass the -b option to
git-mailsplit.

Re-implement these two options in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 0b441fb..4e1ee7f 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -68,6 +68,12 @@ enum patch_format {
 	PATCH_FORMAT_MBOX
 };
 
+enum keep_type {
+	KEEP_FALSE = 0,
+	KEEP_TRUE,      /* pass -k flag to git-mailinfo */
+	KEEP_NON_PATCH  /* pass -b flag to git-mailinfo */
+};
+
 struct am_state {
 	/* state directory path */
 	char *dir;
@@ -94,6 +100,9 @@ struct am_state {
 
 	int utf8;
 
+	/* one of the enum keep_type values */
+	int keep;
+
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
 
@@ -397,6 +406,14 @@ static void am_load(struct am_state *state)
 	read_state_file(&sb, state, "utf8", 1);
 	state->utf8 = !strcmp(sb.buf, "t");
 
+	read_state_file(&sb, state, "keep", 1);
+	if (!strcmp(sb.buf, "t"))
+		state->keep = KEEP_TRUE;
+	else if (!strcmp(sb.buf, "b"))
+		state->keep = KEEP_NON_PATCH;
+	else
+		state->keep = KEEP_FALSE;
+
 	state->rebasing = !!file_exists(am_path(state, "rebasing"));
 
 	strbuf_release(&sb);
@@ -560,6 +577,7 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 			const char **paths)
 {
 	unsigned char curr_head[GIT_SHA1_RAWSZ];
+	const char *str;
 
 	if (!patch_format)
 		patch_format = detect_patch_format(paths);
@@ -588,6 +606,22 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 
 	write_file(am_path(state, "utf8"), 1, state->utf8 ? "t" : "f");
 
+	switch (state->keep) {
+	case KEEP_FALSE:
+		str = "f";
+		break;
+	case KEEP_TRUE:
+		str = "t";
+		break;
+	case KEEP_NON_PATCH:
+		str = "b";
+		break;
+	default:
+		die("BUG: invalid value for state->keep");
+	}
+
+	write_file(am_path(state, "keep"), 1, "%s", str);
+
 	if (state->rebasing)
 		write_file(am_path(state, "rebasing"), 1, "%s", "");
 	else
@@ -760,6 +794,20 @@ static int parse_mail(struct am_state *state, const char *mail)
 
 	argv_array_push(&cp.args, "mailinfo");
 	argv_array_push(&cp.args, state->utf8 ? "-u" : "-n");
+
+	switch (state->keep) {
+	case KEEP_FALSE:
+		break;
+	case KEEP_TRUE:
+		argv_array_push(&cp.args, "-k");
+		break;
+	case KEEP_NON_PATCH:
+		argv_array_push(&cp.args, "-b");
+		break;
+	default:
+		die("BUG: invalid value for state->keep");
+	}
+
 	argv_array_push(&cp.args, am_path(state, "msg"));
 	argv_array_push(&cp.args, am_path(state, "patch"));
 
@@ -1476,6 +1524,10 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 			N_("add a Signed-off-by line to the commit message")),
 		OPT_BOOL('u', "utf8", &state.utf8,
 			N_("recode into utf8 (default)")),
+		OPT_SET_INT('k', "keep", &state.keep,
+			N_("pass -k flag to git-mailinfo"), KEEP_TRUE),
+		OPT_SET_INT(0, "keep-non-patch", &state.keep,
+			N_("pass -b flag to git-mailinfo"), KEEP_NON_PATCH),
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 25/44] builtin-am: implement --[no-]message-id, am.messageid
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (23 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 24/44] builtin-am: implement -k/--keep, --keep-non-patch Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 26/44] builtin-am: support --keep-cr, am.keepcr Paul Tan
                   ` (21 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since a078f73 (git-am: add --message-id/--no-message-id, 2014-11-25),
git-am.sh supported the --[no-]message-id options, and the
"am.messageid" setting which specifies the default option.

--[no-]message-id tells git-am whether or not the -m option should be
passed to git-mailinfo.

Re-implement this option in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 4e1ee7f..099c6ed 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -103,6 +103,9 @@ struct am_state {
 	/* one of the enum keep_type values */
 	int keep;
 
+	/* pass -m flag to git-mailinfo */
+	int message_id;
+
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
 
@@ -125,6 +128,8 @@ static void am_state_init(struct am_state *state, const char *dir)
 	git_config_get_bool("am.threeway", &state->threeway);
 
 	state->utf8 = 1;
+
+	git_config_get_bool("am.messageid", &state->message_id);
 }
 
 /**
@@ -414,6 +419,9 @@ static void am_load(struct am_state *state)
 	else
 		state->keep = KEEP_FALSE;
 
+	read_state_file(&sb, state, "messageid", 1);
+	state->message_id = !strcmp(sb.buf, "t");
+
 	state->rebasing = !!file_exists(am_path(state, "rebasing"));
 
 	strbuf_release(&sb);
@@ -622,6 +630,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 
 	write_file(am_path(state, "keep"), 1, "%s", str);
 
+	write_file(am_path(state, "messageid"), 1, state->message_id ? "t" : "f");
+
 	if (state->rebasing)
 		write_file(am_path(state, "rebasing"), 1, "%s", "");
 	else
@@ -808,6 +818,9 @@ static int parse_mail(struct am_state *state, const char *mail)
 		die("BUG: invalid value for state->keep");
 	}
 
+	if (state->message_id)
+		argv_array_push(&cp.args, "-m");
+
 	argv_array_push(&cp.args, am_path(state, "msg"));
 	argv_array_push(&cp.args, am_path(state, "patch"));
 
@@ -1528,6 +1541,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 			N_("pass -k flag to git-mailinfo"), KEEP_TRUE),
 		OPT_SET_INT(0, "keep-non-patch", &state.keep,
 			N_("pass -b flag to git-mailinfo"), KEEP_NON_PATCH),
+		OPT_BOOL('m', "message-id", &state.message_id,
+			N_("pass -m flag to git-mailinfo")),
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 26/44] builtin-am: support --keep-cr, am.keepcr
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (24 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 25/44] builtin-am: implement --[no-]message-id, am.messageid Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 27/44] builtin-am: implement --[no-]scissors Paul Tan
                   ` (20 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since ad2c928 (git-am: Add command line parameter `--keep-cr` passing it
to git-mailsplit, 2010-02-27), git-am.sh supported the --keep-cr option
and would pass it to git-mailsplit.

Since e80d4cb (git-am: Add am.keepcr and --no-keep-cr to override it,
2010-02-27), git-am.sh supported the am.keepcr config setting, which
controls whether --keep-cr is on by default.

Re-implement the above in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/builtin/am.c b/builtin/am.c
index 099c6ed..59a7a2a 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -530,7 +530,7 @@ done:
  * Splits out individual email patches from `paths`, where each path is either
  * a mbox file or a Maildir. Returns 0 on success, -1 on failure.
  */
-static int split_mail_mbox(struct am_state *state, const char **paths)
+static int split_mail_mbox(struct am_state *state, const char **paths, int keep_cr)
 {
 	struct child_process cp = CHILD_PROCESS_INIT;
 	struct strbuf last = STRBUF_INIT;
@@ -540,6 +540,8 @@ static int split_mail_mbox(struct am_state *state, const char **paths)
 	argv_array_pushf(&cp.args, "-d%d", state->prec);
 	argv_array_pushf(&cp.args, "-o%s", state->dir);
 	argv_array_push(&cp.args, "-b");
+	if (keep_cr)
+		argv_array_push(&cp.args, "--keep-cr");
 	argv_array_push(&cp.args, "--");
 	argv_array_pushv(&cp.args, paths);
 
@@ -564,14 +566,22 @@ static int split_mail_mbox(struct am_state *state, const char **paths)
  * state->cur will be set to the index of the first mail, and state->last will
  * be set to the index of the last mail.
  *
+ * Set keep_cr to 0 to convert all lines ending with \r\n to end with \n, 1
+ * to disable this behavior, -1 to use the default configured setting.
+ *
  * Returns 0 on success, -1 on failure.
  */
 static int split_mail(struct am_state *state, enum patch_format patch_format,
-			const char **paths)
+			const char **paths, int keep_cr)
 {
+	if (keep_cr < 0) {
+		keep_cr = 0;
+		git_config_get_bool("am.keepcr", &keep_cr);
+	}
+
 	switch (patch_format) {
 	case PATCH_FORMAT_MBOX:
-		return split_mail_mbox(state, paths);
+		return split_mail_mbox(state, paths, keep_cr);
 	default:
 		die("BUG: invalid patch_format");
 	}
@@ -582,7 +592,7 @@ static int split_mail(struct am_state *state, enum patch_format patch_format,
  * Setup a new am session for applying patches
  */
 static void am_setup(struct am_state *state, enum patch_format patch_format,
-			const char **paths)
+			const char **paths, int keep_cr)
 {
 	unsigned char curr_head[GIT_SHA1_RAWSZ];
 	const char *str;
@@ -598,7 +608,7 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 	if (mkdir(state->dir, 0777) < 0 && errno != EEXIST)
 		die_errno(_("failed to create directory '%s'"), state->dir);
 
-	if (split_mail(state, patch_format, paths) < 0) {
+	if (split_mail(state, patch_format, paths, keep_cr) < 0) {
 		am_destroy(state);
 		die(_("Failed to split patches."));
 	}
@@ -1520,6 +1530,7 @@ enum resume_mode {
 int cmd_am(int argc, const char **argv, const char *prefix)
 {
 	struct am_state state;
+	int keep_cr = -1;
 	int patch_format = PATCH_FORMAT_UNKNOWN;
 	enum resume_mode resume = RESUME_FALSE;
 
@@ -1543,6 +1554,12 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 			N_("pass -b flag to git-mailinfo"), KEEP_NON_PATCH),
 		OPT_BOOL('m', "message-id", &state.message_id,
 			N_("pass -m flag to git-mailinfo")),
+		{ OPTION_SET_INT, 0, "keep-cr", &keep_cr, NULL,
+		  N_("pass --keep-cr flag to git-mailsplit for mbox format"),
+		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 1},
+		{ OPTION_SET_INT, 0, "no-keep-cr", &keep_cr, NULL,
+		  N_("do not pass --keep-cr flag to git-mailsplit independent of am.keepcr"),
+		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 0},
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
@@ -1637,7 +1654,7 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 				argv_array_push(&paths, mkpath("%s/%s", prefix, argv[i]));
 		}
 
-		am_setup(&state, patch_format, paths.argv);
+		am_setup(&state, patch_format, paths.argv, keep_cr);
 
 		argv_array_clear(&paths);
 	}
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 27/44] builtin-am: implement --[no-]scissors
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (25 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 26/44] builtin-am: support --keep-cr, am.keepcr Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 28/44] builtin-am: pass git-apply's options to git-apply Paul Tan
                   ` (19 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 017678b (am/mailinfo: Disable scissors processing by default,
2009-08-26), git-am supported the --[no-]scissors option, passing it to
git-mailinfo.

Re-implement support for this option in builtin/am.c.

Since the default setting of --scissors in git-mailinfo can be
configured with mailinfo.scissors (and perhaps through other settings in
the future), to be safe we make an explicit distinction between
SCISSORS_UNSET, SCISSORS_TRUE and SCISSORS_FALSE.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * Previously, SCISSORS_FALSE was 1 while SCISSORS_TRUE was 0. This
      should be the other way around.

 builtin/am.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 59a7a2a..2e46a06 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -74,6 +74,12 @@ enum keep_type {
 	KEEP_NON_PATCH  /* pass -b flag to git-mailinfo */
 };
 
+enum scissors_type {
+	SCISSORS_UNSET = -1,
+	SCISSORS_FALSE = 0,  /* pass --no-scissors to git-mailinfo */
+	SCISSORS_TRUE        /* pass --scissors to git-mailinfo */
+};
+
 struct am_state {
 	/* state directory path */
 	char *dir;
@@ -106,6 +112,9 @@ struct am_state {
 	/* pass -m flag to git-mailinfo */
 	int message_id;
 
+	/* one of the enum scissors_type values */
+	int scissors;
+
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
 
@@ -130,6 +139,8 @@ static void am_state_init(struct am_state *state, const char *dir)
 	state->utf8 = 1;
 
 	git_config_get_bool("am.messageid", &state->message_id);
+
+	state->scissors = SCISSORS_UNSET;
 }
 
 /**
@@ -422,6 +433,14 @@ static void am_load(struct am_state *state)
 	read_state_file(&sb, state, "messageid", 1);
 	state->message_id = !strcmp(sb.buf, "t");
 
+	read_state_file(&sb, state, "scissors", 1);
+	if (!strcmp(sb.buf, "t"))
+		state->scissors = SCISSORS_TRUE;
+	else if (!strcmp(sb.buf, "f"))
+		state->scissors = SCISSORS_FALSE;
+	else
+		state->scissors = SCISSORS_UNSET;
+
 	state->rebasing = !!file_exists(am_path(state, "rebasing"));
 
 	strbuf_release(&sb);
@@ -642,6 +661,22 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 
 	write_file(am_path(state, "messageid"), 1, state->message_id ? "t" : "f");
 
+	switch (state->scissors) {
+	case SCISSORS_UNSET:
+		str = "";
+		break;
+	case SCISSORS_FALSE:
+		str = "f";
+		break;
+	case SCISSORS_TRUE:
+		str = "t";
+		break;
+	default:
+		die("BUG: invalid value for state->scissors");
+	}
+
+	write_file(am_path(state, "scissors"), 1, "%s", str);
+
 	if (state->rebasing)
 		write_file(am_path(state, "rebasing"), 1, "%s", "");
 	else
@@ -831,6 +866,19 @@ static int parse_mail(struct am_state *state, const char *mail)
 	if (state->message_id)
 		argv_array_push(&cp.args, "-m");
 
+	switch (state->scissors) {
+	case SCISSORS_UNSET:
+		break;
+	case SCISSORS_FALSE:
+		argv_array_push(&cp.args, "--no-scissors");
+		break;
+	case SCISSORS_TRUE:
+		argv_array_push(&cp.args, "--scissors");
+		break;
+	default:
+		die("BUG: invalid value for state->scissors");
+	}
+
 	argv_array_push(&cp.args, am_path(state, "msg"));
 	argv_array_push(&cp.args, am_path(state, "patch"));
 
@@ -1560,6 +1608,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		{ OPTION_SET_INT, 0, "no-keep-cr", &keep_cr, NULL,
 		  N_("do not pass --keep-cr flag to git-mailsplit independent of am.keepcr"),
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 0},
+		OPT_BOOL('c', "scissors", &state.scissors,
+			N_("strip everything before a scissors line")),
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 28/44] builtin-am: pass git-apply's options to git-apply
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (26 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 27/44] builtin-am: implement --[no-]scissors Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 29/44] builtin-am: implement --ignore-date Paul Tan
                   ` (18 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

git-am.sh recognizes some of git-apply's options, and would pass them to
git-apply:

* --whitespace, since 8c31cb8 (git-am: --whitespace=x option.,
  2006-02-28)

* -C, since 67dad68 (add -C[NUM] to git-am, 2007-02-08)

* -p, since 2092a1f (Teach git-am to pass -p option down to git-apply,
  2007-02-11)

* --directory, since b47dfe9 (git-am: add --directory=<dir> option,
  2009-01-11)

* --reject, since b80da42 (git-am: implement --reject option passed to
  git-apply, 2009-01-23)

* --ignore-space-change, --ignore-whitespace, since 86c91f9 (git apply:
  option to ignore whitespace differences, 2009-08-04)

* --exclude, since 77e9e49 (am: pass exclude down to apply, 2011-08-03)

* --include, since 58725ef (am: support --include option, 2012-03-28)

* --reject, since b80da42 (git-am: implement --reject option passed to
  git-apply, 2009-01-23)

Re-implement support for these options in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 2e46a06..6006010 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -115,6 +115,8 @@ struct am_state {
 	/* one of the enum scissors_type values */
 	int scissors;
 
+	struct argv_array git_apply_opts;
+
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
 
@@ -141,6 +143,8 @@ static void am_state_init(struct am_state *state, const char *dir)
 	git_config_get_bool("am.messageid", &state->message_id);
 
 	state->scissors = SCISSORS_UNSET;
+
+	argv_array_init(&state->git_apply_opts);
 }
 
 /**
@@ -162,6 +166,8 @@ static void am_state_release(struct am_state *state)
 
 	if (state->msg)
 		free(state->msg);
+
+	argv_array_clear(&state->git_apply_opts);
 }
 
 /**
@@ -441,6 +447,11 @@ static void am_load(struct am_state *state)
 	else
 		state->scissors = SCISSORS_UNSET;
 
+	read_state_file(&sb, state, "apply-opt", 1);
+	argv_array_clear(&state->git_apply_opts);
+	if (sq_dequote_to_argv_array(sb.buf, &state->git_apply_opts) < 0)
+		die(_("could not parse %s"), am_path(state, "apply-opt"));
+
 	state->rebasing = !!file_exists(am_path(state, "rebasing"));
 
 	strbuf_release(&sb);
@@ -615,6 +626,7 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 {
 	unsigned char curr_head[GIT_SHA1_RAWSZ];
 	const char *str;
+	struct strbuf sb = STRBUF_INIT;
 
 	if (!patch_format)
 		patch_format = detect_patch_format(paths);
@@ -677,6 +689,9 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 
 	write_file(am_path(state, "scissors"), 1, "%s", str);
 
+	sq_quote_argv(&sb, state->git_apply_opts.argv, 0);
+	write_file(am_path(state, "apply-opt"), 1, "%s", sb.buf);
+
 	if (state->rebasing)
 		write_file(am_path(state, "rebasing"), 1, "%s", "");
 	else
@@ -701,6 +716,8 @@ static void am_setup(struct am_state *state, enum patch_format patch_format,
 	write_file(am_path(state, "next"), 1, "%d", state->cur);
 
 	write_file(am_path(state, "last"), 1, "%d", state->last);
+
+	strbuf_release(&sb);
 }
 
 /**
@@ -1093,6 +1110,8 @@ static int run_apply(const struct am_state *state, const char *index_file)
 
 	argv_array_push(&cp.args, "apply");
 
+	argv_array_pushv(&cp.args, state->git_apply_opts.argv);
+
 	if (index_file)
 		argv_array_push(&cp.args, "--cached");
 	else
@@ -1119,6 +1138,7 @@ static int build_fake_ancestor(const struct am_state *state, const char *index_f
 
 	cp.git_cmd = 1;
 	argv_array_push(&cp.args, "apply");
+	argv_array_pushv(&cp.args, state->git_apply_opts.argv);
 	argv_array_pushf(&cp.args, "--build-fake-ancestor=%s", index_file);
 	argv_array_push(&cp.args, am_path(state, "patch"));
 
@@ -1610,9 +1630,36 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		  PARSE_OPT_NOARG | PARSE_OPT_NONEG, NULL, 0},
 		OPT_BOOL('c', "scissors", &state.scissors,
 			N_("strip everything before a scissors line")),
+		OPT_PASSTHRU_ARGV(0, "whitespace", &state.git_apply_opts, N_("action"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV(0, "ignore-space-change", &state.git_apply_opts, NULL,
+			N_("pass it through git-apply"),
+			PARSE_OPT_NOARG),
+		OPT_PASSTHRU_ARGV(0, "ignore-whitespace", &state.git_apply_opts, NULL,
+			N_("pass it through git-apply"),
+			PARSE_OPT_NOARG),
+		OPT_PASSTHRU_ARGV(0, "directory", &state.git_apply_opts, N_("root"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV(0, "exclude", &state.git_apply_opts, N_("path"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV(0, "include", &state.git_apply_opts, N_("path"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV('C', NULL, &state.git_apply_opts, N_("n"),
+			N_("pass it through git-apply"),
+			0),
+		OPT_PASSTHRU_ARGV('p', NULL, &state.git_apply_opts, N_("num"),
+			N_("pass it through git-apply"),
+			0),
 		OPT_CALLBACK(0, "patch-format", &patch_format, N_("format"),
 			N_("format the patch(es) are in"),
 			parse_opt_patchformat),
+		OPT_PASSTHRU_ARGV(0, "reject", &state.git_apply_opts, NULL,
+			N_("pass it through git-apply"),
+			PARSE_OPT_NOARG),
 		OPT_STRING(0, "resolvemsg", &state.resolvemsg, NULL,
 			N_("override error message when patch failure occurs")),
 		OPT_CMDMODE(0, "continue", &resume,
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 29/44] builtin-am: implement --ignore-date
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (27 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 28/44] builtin-am: pass git-apply's options to git-apply Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 30/44] builtin-am: implement --committer-date-is-author-date Paul Tan
                   ` (17 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since a79ec62 (git-am: Add --ignore-date option, 2009-01-24), git-am.sh
supported the --ignore-date option, and would use the current timestamp
instead of the one provided in the patch if the option was set.

Re-implement this option in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index 6006010..e9eacf0 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -120,6 +120,8 @@ struct am_state {
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
 
+	int ignore_date;
+
 	int rebasing;
 };
 
@@ -1254,7 +1256,8 @@ static void do_commit(const struct am_state *state)
 	}
 
 	author = fmt_ident(state->author_name, state->author_email,
-			state->author_date, IDENT_STRICT);
+			state->ignore_date ? NULL : state->author_date,
+			IDENT_STRICT);
 
 	if (commit_tree(state->msg, state->msg_len, tree, parents, commit,
 				author, NULL))
@@ -1674,6 +1677,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_CMDMODE(0, "abort", &resume,
 			N_("restore the original branch and abort the patching operation."),
 			RESUME_ABORT),
+		OPT_BOOL(0, "ignore-date", &state.ignore_date,
+			N_("use current timestamp for author date")),
 		OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
 			N_("(internal use for git-rebase)")),
 		OPT_END()
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 30/44] builtin-am: implement --committer-date-is-author-date
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (28 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 29/44] builtin-am: implement --ignore-date Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 31/44] builtin-am: implement -S/--gpg-sign, commit.gpgsign Paul Tan
                   ` (16 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 3f01ad6 (am: Add --committer-date-is-author-date option,
2009-01-22), git-am.sh implemented the --committer-date-is-author-date
option, which tells git-am to use the timestamp recorded in the email
message as both author and committer date.

Re-implement this option in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index e9eacf0..d7bb159 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -120,6 +120,8 @@ struct am_state {
 	/* override error message when patch failure occurs */
 	const char *resolvemsg;
 
+	int committer_date_is_author_date;
+
 	int ignore_date;
 
 	int rebasing;
@@ -1259,6 +1261,10 @@ static void do_commit(const struct am_state *state)
 			state->ignore_date ? NULL : state->author_date,
 			IDENT_STRICT);
 
+	if (state->committer_date_is_author_date)
+		setenv("GIT_COMMITTER_DATE",
+			state->ignore_date ? "" : state->author_date, 1);
+
 	if (commit_tree(state->msg, state->msg_len, tree, parents, commit,
 				author, NULL))
 		die(_("failed to write commit object"));
@@ -1677,6 +1683,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_CMDMODE(0, "abort", &resume,
 			N_("restore the original branch and abort the patching operation."),
 			RESUME_ABORT),
+		OPT_BOOL(0, "committer-date-is-author-date",
+			&state.committer_date_is_author_date,
+			N_("lie about committer date")),
 		OPT_BOOL(0, "ignore-date", &state.ignore_date,
 			N_("use current timestamp for author date")),
 		OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 31/44] builtin-am: implement -S/--gpg-sign, commit.gpgsign
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (29 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 30/44] builtin-am: implement --committer-date-is-author-date Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 32/44] builtin-am: invoke post-rewrite hook Paul Tan
                   ` (15 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 3b4e395 (am: add the --gpg-sign option, 2014-02-01), git-am.sh
supported the --gpg-sign option, and would pass it to git-commit-tree,
thus GPG-signing the commit object.

Re-implement this option in builtin/am.c.

git-commit-tree would also sign the commit by default if the
commit.gpgsign setting is true. Since we do not run commit-tree, we
re-implement this behavior by handling the commit.gpgsign setting
ourselves.

Helped-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * Renamed local "sign_commit" variable in am_state_init() to "gpgsign"
      to aid code review.

 builtin/am.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index d7bb159..81b3e31 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -124,6 +124,8 @@ struct am_state {
 
 	int ignore_date;
 
+	const char *sign_commit;
+
 	int rebasing;
 };
 
@@ -133,6 +135,8 @@ struct am_state {
  */
 static void am_state_init(struct am_state *state, const char *dir)
 {
+	int gpgsign;
+
 	memset(state, 0, sizeof(*state));
 
 	assert(dir);
@@ -149,6 +153,9 @@ static void am_state_init(struct am_state *state, const char *dir)
 	state->scissors = SCISSORS_UNSET;
 
 	argv_array_init(&state->git_apply_opts);
+
+	if (!git_config_get_bool("commit.gpgsign", &gpgsign))
+		state->sign_commit = gpgsign ? "" : NULL;
 }
 
 /**
@@ -1266,7 +1273,7 @@ static void do_commit(const struct am_state *state)
 			state->ignore_date ? "" : state->author_date, 1);
 
 	if (commit_tree(state->msg, state->msg_len, tree, parents, commit,
-				author, NULL))
+				author, state->sign_commit))
 		die(_("failed to write commit object"));
 
 	reflog_msg = getenv("GIT_REFLOG_ACTION");
@@ -1688,6 +1695,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 			N_("lie about committer date")),
 		OPT_BOOL(0, "ignore-date", &state.ignore_date,
 			N_("use current timestamp for author date")),
+		{ OPTION_STRING, 'S', "gpg-sign", &state.sign_commit, N_("key-id"),
+		  N_("GPG-sign commits"),
+		  PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
 		OPT_HIDDEN_BOOL(0, "rebasing", &state.rebasing,
 			N_("(internal use for git-rebase)")),
 		OPT_END()
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 32/44] builtin-am: invoke post-rewrite hook
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (30 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 31/44] builtin-am: implement -S/--gpg-sign, commit.gpgsign Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 33/44] builtin-am: support automatic notes copying Paul Tan
                   ` (14 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 96e1948 (rebase: invoke post-rewrite hook, 2010-03-12), git-am.sh
will invoke the post-rewrite hook after it successfully finishes
applying all the queued patches.

To do this, when parsing a mail to extract its patch and metadata, in
--rebasing mode git-am.sh will also store the original commit ID in the
$state_dir/original-commit file. Once it applies and commits the patch,
the original commit ID, and the new commit ID, will be appended to the
$state_dir/rewritten file.

Once all of the queued mail have been processed, git-am.sh will then
invoke the post-rewrite hook with the contents of the
$state_dir/rewritten file.

Re-implement this in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 81b3e31..c234ee9 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -95,6 +95,9 @@ struct am_state {
 	char *msg;
 	size_t msg_len;
 
+	/* when --rebasing, records the original commit the patch came from */
+	unsigned char orig_commit[GIT_SHA1_RAWSZ];
+
 	/* number of digits in patch filename */
 	int prec;
 
@@ -427,6 +430,11 @@ static void am_load(struct am_state *state)
 
 	read_commit_msg(state);
 
+	if (read_state_file(&sb, state, "original-commit", 1) < 0)
+		hashclr(state->orig_commit);
+	else if (get_sha1_hex(sb.buf, state->orig_commit) < 0)
+		die(_("could not parse %s"), am_path(state, "original-commit"));
+
 	read_state_file(&sb, state, "threeway", 1);
 	state->threeway = !strcmp(sb.buf, "t");
 
@@ -482,6 +490,30 @@ static void am_destroy(const struct am_state *state)
 }
 
 /**
+ * Runs post-rewrite hook. Returns it exit code.
+ */
+static int run_post_rewrite_hook(const struct am_state *state)
+{
+	struct child_process cp = CHILD_PROCESS_INIT;
+	const char *hook = find_hook("post-rewrite");
+	int ret;
+
+	if (!hook)
+		return 0;
+
+	argv_array_push(&cp.args, hook);
+	argv_array_push(&cp.args, "rebase");
+
+	cp.in = xopen(am_path(state, "rewritten"), O_RDONLY);
+	cp.stdout_to_stderr = 1;
+
+	ret = run_command(&cp);
+
+	close(cp.in);
+	return ret;
+}
+
+/**
  * Determines if the file looks like a piece of RFC2822 mail by grabbing all
  * non-indented lines and checking if they look like they begin with valid
  * header field names.
@@ -759,6 +791,9 @@ static void am_next(struct am_state *state)
 	unlink(am_path(state, "author-script"));
 	unlink(am_path(state, "final-commit"));
 
+	hashclr(state->orig_commit);
+	unlink(am_path(state, "original-commit"));
+
 	if (!get_sha1("HEAD", head))
 		write_file(am_path(state, "abort-safety"), 1, "%s", sha1_to_hex(head));
 	else
@@ -1078,6 +1113,8 @@ static void write_commit_patch(const struct am_state *state, struct commit *comm
  * directly. This is used in --rebasing mode to bypass git-mailinfo's munging
  * of patches.
  *
+ * state->orig_commit will be set to the original commit ID.
+ *
  * Will always return 0 as the patch should never be skipped.
  */
 static int parse_mail_rebase(struct am_state *state, const char *mail)
@@ -1094,6 +1131,10 @@ static int parse_mail_rebase(struct am_state *state, const char *mail)
 
 	write_commit_patch(state, commit);
 
+	hashcpy(state->orig_commit, commit_sha1);
+	write_file(am_path(state, "original-commit"), 1, "%s",
+			sha1_to_hex(commit_sha1));
+
 	return 0;
 }
 
@@ -1285,6 +1326,15 @@ static void do_commit(const struct am_state *state)
 
 	update_ref(sb.buf, "HEAD", commit, ptr, 0, UPDATE_REFS_DIE_ON_ERR);
 
+	if (state->rebasing) {
+		FILE *fp = xfopen(am_path(state, "rewritten"), "a");
+
+		assert(!is_null_sha1(state->orig_commit));
+		fprintf(fp, "%s ", sha1_to_hex(state->orig_commit));
+		fprintf(fp, "%s\n", sha1_to_hex(commit));
+		fclose(fp);
+	}
+
 	strbuf_release(&sb);
 }
 
@@ -1367,6 +1417,11 @@ next:
 		am_next(state);
 	}
 
+	if (!is_empty_file(am_path(state, "rewritten"))) {
+		assert(state->rebasing);
+		run_post_rewrite_hook(state);
+	}
+
 	/*
 	 * In rebasing mode, it's up to the caller to take care of
 	 * housekeeping.
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 33/44] builtin-am: support automatic notes copying
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (31 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 32/44] builtin-am: invoke post-rewrite hook Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 34/44] builtin-am: invoke applypatch-msg hook Paul Tan
                   ` (13 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since eb2151b (rebase: support automatic notes copying, 2010-03-12),
git-am.sh supported automatic notes copying in --rebasing mode by
invoking "git notes copy" once it has finished applying all the patches.

Re-implement this feature in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index c234ee9..2255a1e 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -23,6 +23,7 @@
 #include "merge-recursive.h"
 #include "revision.h"
 #include "log-tree.h"
+#include "notes-utils.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -514,6 +515,64 @@ static int run_post_rewrite_hook(const struct am_state *state)
 }
 
 /**
+ * Reads the state directory's "rewritten" file, and copies notes from the old
+ * commits listed in the file to their rewritten commits.
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+static int copy_notes_for_rebase(const struct am_state *state)
+{
+	struct notes_rewrite_cfg *c;
+	struct strbuf sb = STRBUF_INIT;
+	const char *invalid_line = _("Malformed input line: '%s'.");
+	const char *msg = "Notes added by 'git rebase'";
+	FILE *fp;
+	int ret = 0;
+
+	assert(state->rebasing);
+
+	c = init_copy_notes_for_rewrite("rebase");
+	if (!c)
+		return 0;
+
+	fp = xfopen(am_path(state, "rewritten"), "r");
+
+	while (!strbuf_getline(&sb, fp, '\n')) {
+		unsigned char from_obj[GIT_SHA1_RAWSZ], to_obj[GIT_SHA1_RAWSZ];
+
+		if (sb.len != GIT_SHA1_HEXSZ * 2 + 1) {
+			ret = error(invalid_line, sb.buf);
+			goto finish;
+		}
+
+		if (get_sha1_hex(sb.buf, from_obj)) {
+			ret = error(invalid_line, sb.buf);
+			goto finish;
+		}
+
+		if (sb.buf[GIT_SHA1_HEXSZ] != ' ') {
+			ret = error(invalid_line, sb.buf);
+			goto finish;
+		}
+
+		if (get_sha1_hex(sb.buf + GIT_SHA1_HEXSZ + 1, to_obj)) {
+			ret = error(invalid_line, sb.buf);
+			goto finish;
+		}
+
+		if (copy_note_for_rewrite(c, from_obj, to_obj))
+			ret = error(_("Failed to copy notes from '%s' to '%s'"),
+					sha1_to_hex(from_obj), sha1_to_hex(to_obj));
+	}
+
+finish:
+	finish_copy_notes_for_rewrite(c, msg);
+	fclose(fp);
+	strbuf_release(&sb);
+	return ret;
+}
+
+/**
  * Determines if the file looks like a piece of RFC2822 mail by grabbing all
  * non-indented lines and checking if they look like they begin with valid
  * header field names.
@@ -1419,6 +1478,7 @@ next:
 
 	if (!is_empty_file(am_path(state, "rewritten"))) {
 		assert(state->rebasing);
+		copy_notes_for_rebase(state);
 		run_post_rewrite_hook(state);
 	}
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 34/44] builtin-am: invoke applypatch-msg hook
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (32 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 33/44] builtin-am: support automatic notes copying Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 35/44] builtin-am: invoke pre-applypatch hook Paul Tan
                   ` (12 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07),
git-am.sh will invoke the applypatch-msg hooks just after extracting the
patch message. If the applypatch-msg hook exits with a non-zero status,
git-am.sh abort before even applying the patch to the index.

Re-implement this in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 2255a1e..f856d3b 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -491,6 +491,27 @@ static void am_destroy(const struct am_state *state)
 }
 
 /**
+ * Runs applypatch-msg hook. Returns its exit code.
+ */
+static int run_applypatch_msg_hook(struct am_state *state)
+{
+	int ret;
+
+	assert(state->msg);
+	ret = run_hook_le(NULL, "applypatch-msg", am_path(state, "final-commit"), NULL);
+
+	if (!ret) {
+		free(state->msg);
+		state->msg = NULL;
+		if (read_commit_msg(state) < 0)
+			die(_("'%s' was deleted by the applypatch-msg hook"),
+				am_path(state, "final-commit"));
+	}
+
+	return ret;
+}
+
+/**
  * Runs post-rewrite hook. Returns it exit code.
  */
 static int run_post_rewrite_hook(const struct am_state *state)
@@ -1434,6 +1455,9 @@ static void am_run(struct am_state *state)
 		write_author_script(state);
 		write_commit_msg(state);
 
+		if (run_applypatch_msg_hook(state))
+			exit(1);
+
 		say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
 
 		apply_status = run_apply(state, NULL);
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 35/44] builtin-am: invoke pre-applypatch hook
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (33 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 34/44] builtin-am: invoke applypatch-msg hook Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 36/44] builtin-am: invoke post-applypatch hook Paul Tan
                   ` (11 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07),
git-am.sg will invoke the pre-applypatch hook after applying the patch
to the index, but before a commit is made. Should the hook exit with a
non-zero status, git am will exit.

Re-implement this in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index f856d3b..407775c 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1374,6 +1374,9 @@ static void do_commit(const struct am_state *state)
 	const char *reflog_msg, *author;
 	struct strbuf sb = STRBUF_INIT;
 
+	if (run_hook_le(NULL, "pre-applypatch", NULL))
+		exit(1);
+
 	if (write_cache_as_tree(tree, 0, NULL))
 		die(_("git write-tree failed to write a tree"));
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 36/44] builtin-am: invoke post-applypatch hook
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (34 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 35/44] builtin-am: invoke pre-applypatch hook Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 37/44] builtin-am: rerere support Paul Tan
                   ` (10 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07),
git-am.sh will invoke the post-applypatch hook after the patch is
applied and a commit is made. The exit code of the hook is ignored.

Re-implement this in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 407775c..fdaf0a7 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1418,6 +1418,8 @@ static void do_commit(const struct am_state *state)
 		fclose(fp);
 	}
 
+	run_hook_le(NULL, "post-applypatch", NULL);
+
 	strbuf_release(&sb);
 }
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 37/44] builtin-am: rerere support
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (35 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 36/44] builtin-am: invoke post-applypatch hook Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 38/44] builtin-am: support and auto-detect StGit patches Paul Tan
                   ` (9 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

git-am.sh will call git-rerere at the following events:

* "git rerere" when a three-way merge fails to record the conflicted
  automerge results. Since 8389b52 (git-rerere: reuse recorded resolve.,
  2006-01-28)

  * Since cb6020b (Teach --[no-]rerere-autoupdate option to merge,
    revert and friends, 2009-12-04), git-am.sh supports the
    --[no-]rerere-autoupdate option as well, and would pass it to
    git-rerere.

* "git rerere" when --resolved, to record the hand resolution. Since
  f131dd4 (rerere: record (or avoid misrecording) resolved, skipped or
  aborted rebase/am, 2006-12-08)

* "git rerere clear" when --skip-ing. Since f131dd4 (rerere: record (or
  avoid misrecording) resolved, skipped or aborted rebase/am,
  2006-12-08)

* "git rerere clear" when --abort-ing. Since 3e5057a (git am --abort,
  2008-07-16)

Re-implement the above in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index fdaf0a7..6b388de 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -24,6 +24,7 @@
 #include "revision.h"
 #include "log-tree.h"
 #include "notes-utils.h"
+#include "rerere.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -128,6 +129,8 @@ struct am_state {
 
 	int ignore_date;
 
+	int allow_rerere_autoupdate;
+
 	const char *sign_commit;
 
 	int rebasing;
@@ -1352,6 +1355,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
 		o.verbosity = 0;
 
 	if (merge_recursive_generic(&o, our_tree, his_tree, 1, bases, &result)) {
+		rerere(state->allow_rerere_autoupdate);
 		free(his_tree_name);
 		return error(_("Failed to merge in the changes."));
 	}
@@ -1551,6 +1555,8 @@ static void am_resolve(struct am_state *state)
 		die_user_resolve(state);
 	}
 
+	rerere(0);
+
 	do_commit(state);
 
 	am_next(state);
@@ -1649,12 +1655,29 @@ static int clean_index(const unsigned char *head, const unsigned char *remote)
 }
 
 /**
+ * Resets rerere's merge resolution metadata.
+ */
+static void am_rerere_clear(void)
+{
+	struct string_list merge_rr = STRING_LIST_INIT_DUP;
+	int fd = setup_rerere(&merge_rr, 0);
+
+	if (fd < 0)
+		return;
+
+	rerere_clear(&merge_rr);
+	string_list_clear(&merge_rr, 1);
+}
+
+/**
  * Resume the current am session by skipping the current patch.
  */
 static void am_skip(struct am_state *state)
 {
 	unsigned char head[GIT_SHA1_RAWSZ];
 
+	am_rerere_clear();
+
 	if (get_sha1("HEAD", head))
 		hashcpy(head, EMPTY_TREE_SHA1_BIN);
 
@@ -1712,6 +1735,8 @@ static void am_abort(struct am_state *state)
 		return;
 	}
 
+	am_rerere_clear();
+
 	curr_branch = resolve_refdup("HEAD", 0, curr_head, NULL);
 	has_curr_head = !is_null_sha1(curr_head);
 	if (!has_curr_head)
@@ -1839,6 +1864,7 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 			N_("lie about committer date")),
 		OPT_BOOL(0, "ignore-date", &state.ignore_date,
 			N_("use current timestamp for author date")),
+		OPT_RERERE_AUTOUPDATE(&state.allow_rerere_autoupdate),
 		{ OPTION_STRING, 'S', "gpg-sign", &state.sign_commit, N_("key-id"),
 		  N_("GPG-sign commits"),
 		  PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 38/44] builtin-am: support and auto-detect StGit patches
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (36 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 37/44] builtin-am: rerere support Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 39/44] builtin-am: support and auto-detect StGit series files Paul Tan
                   ` (8 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since c574e68 (git-am foreign patch support: StGIT support, 2009-05-27),
git-am.sh supported converting StGit patches into RFC2822 mail patches
that can be parsed with git-mailinfo.

Implement this by introducing two functions in builtin/am.c:
stgit_patch_to_mail() and split_mail_conv().

stgit_patch_to_mail() is a callback function for split_mail_conv(), and
contains the logic for converting an StGit patch into an RFC2822 mail
patch.

split_mail_conv() implements the logic to go through each file in the
`paths` list, reading from stdin where specified, and calls the callback
function to write the converted patch to the corresponding output file
in the state directory. This interface should be generic enough to
support other foreign patch formats in the future.

Since 15ced75 (git-am foreign patch support: autodetect some patch
formats, 2009-05-27), git-am.sh is able to auto-detect StGit patches.
Re-implement this in builtin/am.c.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * Rewrite of the loop in str_isspace() to be clearer.

 builtin/am.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 131 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index 6b388de..0bb1875 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -65,9 +65,22 @@ static int linelen(const char *msg)
 	return strchrnul(msg, '\n') - msg;
 }
 
+/**
+ * Returns true if `str` consists of only whitespace, false otherwise.
+ */
+static int str_isspace(const char *str)
+{
+	for (; *str; str++)
+		if (!isspace(*str))
+			return 0;
+
+	return 1;
+}
+
 enum patch_format {
 	PATCH_FORMAT_UNKNOWN = 0,
-	PATCH_FORMAT_MBOX
+	PATCH_FORMAT_MBOX,
+	PATCH_FORMAT_STGIT
 };
 
 enum keep_type {
@@ -646,6 +659,8 @@ static int detect_patch_format(const char **paths)
 {
 	enum patch_format ret = PATCH_FORMAT_UNKNOWN;
 	struct strbuf l1 = STRBUF_INIT;
+	struct strbuf l2 = STRBUF_INIT;
+	struct strbuf l3 = STRBUF_INIT;
 	FILE *fp;
 
 	/*
@@ -671,6 +686,23 @@ static int detect_patch_format(const char **paths)
 		goto done;
 	}
 
+	strbuf_reset(&l2);
+	strbuf_getline_crlf(&l2, fp);
+	strbuf_reset(&l3);
+	strbuf_getline_crlf(&l3, fp);
+
+	/*
+	 * If the second line is empty and the third is a From, Author or Date
+	 * entry, this is likely an StGit patch.
+	 */
+	if (l1.len && !l2.len &&
+		(starts_with(l3.buf, "From:") ||
+		 starts_with(l3.buf, "Author:") ||
+		 starts_with(l3.buf, "Date:"))) {
+		ret = PATCH_FORMAT_STGIT;
+		goto done;
+	}
+
 	if (l1.len && is_mail(fp)) {
 		ret = PATCH_FORMAT_MBOX;
 		goto done;
@@ -711,6 +743,100 @@ static int split_mail_mbox(struct am_state *state, const char **paths, int keep_
 }
 
 /**
+ * Callback signature for split_mail_conv(). The foreign patch should be
+ * read from `in`, and the converted patch (in RFC2822 mail format) should be
+ * written to `out`. Return 0 on success, or -1 on failure.
+ */
+typedef int (*mail_conv_fn)(FILE *out, FILE *in, int keep_cr);
+
+/**
+ * Calls `fn` for each file in `paths` to convert the foreign patch to the
+ * RFC2822 mail format suitable for parsing with git-mailinfo.
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+static int split_mail_conv(mail_conv_fn fn, struct am_state *state,
+			const char **paths, int keep_cr)
+{
+	static const char *stdin_only[] = {"-", NULL};
+	int i;
+
+	if (!*paths)
+		paths = stdin_only;
+
+	for (i = 0; *paths; paths++, i++) {
+		FILE *in, *out;
+		const char *mail;
+		int ret;
+
+		if (!strcmp(*paths, "-"))
+			in = stdin;
+		else
+			in = fopen(*paths, "r");
+
+		if (!in)
+			return error(_("could not open '%s' for reading: %s"),
+					*paths, strerror(errno));
+
+		mail = mkpath("%s/%0*d", state->dir, state->prec, i + 1);
+
+		out = fopen(mail, "w");
+		if (!out)
+			return error(_("could not open '%s' for writing: %s"),
+					mail, strerror(errno));
+
+		ret = fn(out, in, keep_cr);
+
+		fclose(out);
+		fclose(in);
+
+		if (ret)
+			return error(_("could not parse patch '%s'"), *paths);
+	}
+
+	state->cur = 1;
+	state->last = i;
+	return 0;
+}
+
+/**
+ * A split_mail_conv() callback that converts an StGit patch to an RFC2822
+ * message suitable for parsing with git-mailinfo.
+ */
+static int stgit_patch_to_mail(FILE *out, FILE *in, int keep_cr)
+{
+	struct strbuf sb = STRBUF_INIT;
+	int subject_printed = 0;
+
+	while (!strbuf_getline(&sb, in, '\n')) {
+		const char *str;
+
+		if (str_isspace(sb.buf))
+			continue;
+		else if (skip_prefix(sb.buf, "Author:", &str))
+			fprintf(out, "From:%s\n", str);
+		else if (starts_with(sb.buf, "From") || starts_with(sb.buf, "Date"))
+			fprintf(out, "%s\n", sb.buf);
+		else if (!subject_printed) {
+			fprintf(out, "Subject: %s\n", sb.buf);
+			subject_printed = 1;
+		} else {
+			fprintf(out, "\n%s\n", sb.buf);
+			break;
+		}
+	}
+
+	strbuf_reset(&sb);
+	while (strbuf_fread(&sb, 8192, in) > 0) {
+		fwrite(sb.buf, 1, sb.len, out);
+		strbuf_reset(&sb);
+	}
+
+	strbuf_release(&sb);
+	return 0;
+}
+
+/**
  * Splits a list of files/directories into individual email patches. Each path
  * in `paths` must be a file/directory that is formatted according to
  * `patch_format`.
@@ -738,6 +864,8 @@ static int split_mail(struct am_state *state, enum patch_format patch_format,
 	switch (patch_format) {
 	case PATCH_FORMAT_MBOX:
 		return split_mail_mbox(state, paths, keep_cr);
+	case PATCH_FORMAT_STGIT:
+		return split_mail_conv(stgit_patch_to_mail, state, paths, keep_cr);
 	default:
 		die("BUG: invalid patch_format");
 	}
@@ -1768,6 +1896,8 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
 
 	if (!strcmp(arg, "mbox"))
 		*opt_value = PATCH_FORMAT_MBOX;
+	else if (!strcmp(arg, "stgit"))
+		*opt_value = PATCH_FORMAT_STGIT;
 	else
 		return error(_("Invalid value for --patch-format: %s"), arg);
 	return 0;
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 39/44] builtin-am: support and auto-detect StGit series files
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (37 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 38/44] builtin-am: support and auto-detect StGit patches Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 40/44] builtin-am: support and auto-detect mercurial patches Paul Tan
                   ` (7 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since c574e68 (git-am foreign patch support: StGIT support, 2009-05-27),
git-am.sh is able to read a single StGit series file and, for each StGit
patch listed in the file, convert the StGit patch into a RFC2822 mail
patch suitable for parsing with git-mailinfo, and queue them in the
state directory for applying.

Since 15ced75 (git-am foreign patch support: autodetect some patch
formats, 2009-05-27), git-am.sh is able to auto-detect StGit series
files by checking to see if the file starts with the string:

	# This series applies on GIT commit

Re-implement the above in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index 0bb1875..7a56005 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -80,7 +80,8 @@ static int str_isspace(const char *str)
 enum patch_format {
 	PATCH_FORMAT_UNKNOWN = 0,
 	PATCH_FORMAT_MBOX,
-	PATCH_FORMAT_STGIT
+	PATCH_FORMAT_STGIT,
+	PATCH_FORMAT_STGIT_SERIES
 };
 
 enum keep_type {
@@ -686,6 +687,11 @@ static int detect_patch_format(const char **paths)
 		goto done;
 	}
 
+	if (starts_with(l1.buf, "# This series applies on GIT commit")) {
+		ret = PATCH_FORMAT_STGIT_SERIES;
+		goto done;
+	}
+
 	strbuf_reset(&l2);
 	strbuf_getline_crlf(&l2, fp);
 	strbuf_reset(&l3);
@@ -837,6 +843,53 @@ static int stgit_patch_to_mail(FILE *out, FILE *in, int keep_cr)
 }
 
 /**
+ * This function only supports a single StGit series file in `paths`.
+ *
+ * Given an StGit series file, converts the StGit patches in the series into
+ * RFC2822 messages suitable for parsing with git-mailinfo, and queues them in
+ * the state directory.
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+static int split_mail_stgit_series(struct am_state *state, const char **paths,
+					int keep_cr)
+{
+	const char *series_dir;
+	char *series_dir_buf;
+	FILE *fp;
+	struct argv_array patches = ARGV_ARRAY_INIT;
+	struct strbuf sb = STRBUF_INIT;
+	int ret;
+
+	if (!paths[0] || paths[1])
+		return error(_("Only one StGIT patch series can be applied at once"));
+
+	series_dir_buf = xstrdup(*paths);
+	series_dir = dirname(series_dir_buf);
+
+	fp = fopen(*paths, "r");
+	if (!fp)
+		return error(_("could not open '%s' for reading: %s"), *paths,
+				strerror(errno));
+
+	while (!strbuf_getline(&sb, fp, '\n')) {
+		if (*sb.buf == '#')
+			continue; /* skip comment lines */
+
+		argv_array_push(&patches, mkpath("%s/%s", series_dir, sb.buf));
+	}
+
+	fclose(fp);
+	strbuf_release(&sb);
+	free(series_dir_buf);
+
+	ret = split_mail_conv(stgit_patch_to_mail, state, patches.argv, keep_cr);
+
+	argv_array_clear(&patches);
+	return ret;
+}
+
+/**
  * Splits a list of files/directories into individual email patches. Each path
  * in `paths` must be a file/directory that is formatted according to
  * `patch_format`.
@@ -866,6 +919,8 @@ static int split_mail(struct am_state *state, enum patch_format patch_format,
 		return split_mail_mbox(state, paths, keep_cr);
 	case PATCH_FORMAT_STGIT:
 		return split_mail_conv(stgit_patch_to_mail, state, paths, keep_cr);
+	case PATCH_FORMAT_STGIT_SERIES:
+		return split_mail_stgit_series(state, paths, keep_cr);
 	default:
 		die("BUG: invalid patch_format");
 	}
@@ -1898,6 +1953,8 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
 		*opt_value = PATCH_FORMAT_MBOX;
 	else if (!strcmp(arg, "stgit"))
 		*opt_value = PATCH_FORMAT_STGIT;
+	else if (!strcmp(arg, "stgit-series"))
+		*opt_value = PATCH_FORMAT_STGIT_SERIES;
 	else
 		return error(_("Invalid value for --patch-format: %s"), arg);
 	return 0;
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 40/44] builtin-am: support and auto-detect mercurial patches
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (38 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 39/44] builtin-am: support and auto-detect StGit series files Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:20 ` [PATCH v5 41/44] builtin-am: implement -i/--interactive Paul Tan
                   ` (6 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since 0cfd112 (am: preliminary support for hg patches, 2011-08-29),
git-am.sh could convert mercurial patches to an RFC2822 mail patch
suitable for parsing with git-mailinfo, and queue them in the state
directory for application.

Since 15ced75 (git-am foreign patch support: autodetect some patch
formats, 2009-05-27), git-am.sh was able to auto-detect mercurial
patches by checking if the file begins with the line:

	# HG changeset patch

Re-implement the above in builtin/am.c.

Helped-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * v4 had a math fail in the timestamp conversion. Fixed the math.
    
    * In C89, it is implementation defined whether integer division rounds
      towards 0 or towards negative infinity. To be safe, we do the
      timestamp conversion with positive integers only, and then negate the
      result appropriately.

 builtin/am.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 73 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index 7a56005..55962c6 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -81,7 +81,8 @@ enum patch_format {
 	PATCH_FORMAT_UNKNOWN = 0,
 	PATCH_FORMAT_MBOX,
 	PATCH_FORMAT_STGIT,
-	PATCH_FORMAT_STGIT_SERIES
+	PATCH_FORMAT_STGIT_SERIES,
+	PATCH_FORMAT_HG
 };
 
 enum keep_type {
@@ -692,6 +693,11 @@ static int detect_patch_format(const char **paths)
 		goto done;
 	}
 
+	if (!strcmp(l1.buf, "# HG changeset patch")) {
+		ret = PATCH_FORMAT_HG;
+		goto done;
+	}
+
 	strbuf_reset(&l2);
 	strbuf_getline_crlf(&l2, fp);
 	strbuf_reset(&l3);
@@ -890,6 +896,68 @@ static int split_mail_stgit_series(struct am_state *state, const char **paths,
 }
 
 /**
+ * A split_patches_conv() callback that converts a mercurial patch to a RFC2822
+ * message suitable for parsing with git-mailinfo.
+ */
+static int hg_patch_to_mail(FILE *out, FILE *in, int keep_cr)
+{
+	struct strbuf sb = STRBUF_INIT;
+
+	while (!strbuf_getline(&sb, in, '\n')) {
+		const char *str;
+
+		if (skip_prefix(sb.buf, "# User ", &str))
+			fprintf(out, "From: %s\n", str);
+		else if (skip_prefix(sb.buf, "# Date ", &str)) {
+			unsigned long timestamp;
+			long tz, tz2;
+			char *end;
+
+			errno = 0;
+			timestamp = strtoul(str, &end, 10);
+			if (errno)
+				return error(_("invalid timestamp"));
+
+			if (!skip_prefix(end, " ", &str))
+				return error(_("invalid Date line"));
+
+			errno = 0;
+			tz = strtol(str, &end, 10);
+			if (errno)
+				return error(_("invalid timezone offset"));
+
+			if (*end)
+				return error(_("invalid Date line"));
+
+			/*
+			 * mercurial's timezone is in seconds west of UTC,
+			 * however git's timezone is in hours + minutes east of
+			 * UTC. Convert it.
+			 */
+			tz2 = labs(tz) / 3600 * 100 + labs(tz) % 3600 / 60;
+			if (tz > 0)
+				tz2 = -tz2;
+
+			fprintf(out, "Date: %s\n", show_date(timestamp, tz2, DATE_RFC2822));
+		} else if (starts_with(sb.buf, "# ")) {
+			continue;
+		} else {
+			fprintf(out, "\n%s\n", sb.buf);
+			break;
+		}
+	}
+
+	strbuf_reset(&sb);
+	while (strbuf_fread(&sb, 8192, in) > 0) {
+		fwrite(sb.buf, 1, sb.len, out);
+		strbuf_reset(&sb);
+	}
+
+	strbuf_release(&sb);
+	return 0;
+}
+
+/**
  * Splits a list of files/directories into individual email patches. Each path
  * in `paths` must be a file/directory that is formatted according to
  * `patch_format`.
@@ -921,6 +989,8 @@ static int split_mail(struct am_state *state, enum patch_format patch_format,
 		return split_mail_conv(stgit_patch_to_mail, state, paths, keep_cr);
 	case PATCH_FORMAT_STGIT_SERIES:
 		return split_mail_stgit_series(state, paths, keep_cr);
+	case PATCH_FORMAT_HG:
+		return split_mail_conv(hg_patch_to_mail, state, paths, keep_cr);
 	default:
 		die("BUG: invalid patch_format");
 	}
@@ -1955,6 +2025,8 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
 		*opt_value = PATCH_FORMAT_STGIT;
 	else if (!strcmp(arg, "stgit-series"))
 		*opt_value = PATCH_FORMAT_STGIT_SERIES;
+	else if (!strcmp(arg, "hg"))
+		*opt_value = PATCH_FORMAT_HG;
 	else
 		return error(_("Invalid value for --patch-format: %s"), arg);
 	return 0;
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 41/44] builtin-am: implement -i/--interactive
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (39 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 40/44] builtin-am: support and auto-detect mercurial patches Paul Tan
@ 2015-07-07 14:20 ` Paul Tan
  2015-07-07 14:21 ` [PATCH v5 42/44] builtin-am: implement legacy -b/--binary option Paul Tan
                   ` (5 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:20 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07),
git-am.sh supported the --interactive mode. After parsing the patch mail
and extracting the patch, commit message and authorship info, an
interactive session will begin that allows the user to choose between:

* applying the patch

* applying the patch and all subsequent patches (by disabling
  interactive mode in subsequent patches)

* skipping the patch

* editing the commit message

Since f89ad67 (Add [v]iew patch in git-am interactive., 2005-10-25),
git-am.sh --interactive also supported viewing the patch to be applied.

When --resolved-ing in --interactive mode, we need to take care to
update the patch with the contents of the index, such that the correct
patch will be displayed when the patch is viewed in interactive mode.

Re-implement the above in builtin/am.c

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    Can't be tested because even with test_terminal isatty(0) still returns
    false.

 builtin/am.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 105 insertions(+), 1 deletion(-)

diff --git a/builtin/am.c b/builtin/am.c
index 55962c6..2866328 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -25,6 +25,7 @@
 #include "log-tree.h"
 #include "notes-utils.h"
 #include "rerere.h"
+#include "prompt.h"
 
 /**
  * Returns 1 if the file is empty or does not exist, 0 otherwise.
@@ -118,6 +119,8 @@ struct am_state {
 	/* number of digits in patch filename */
 	int prec;
 
+	int interactive;
+
 	int threeway;
 
 	int quiet;
@@ -1212,7 +1215,7 @@ static void NORETURN die_user_resolve(const struct am_state *state)
 	if (state->resolvemsg) {
 		printf_ln("%s", state->resolvemsg);
 	} else {
-		const char *cmdline = "git am";
+		const char *cmdline = state->interactive ? "git am -i" : "git am";
 
 		printf_ln(_("When you have resolved this problem, run \"%s --continue\"."), cmdline);
 		printf_ln(_("If you prefer to skip this patch, run \"%s --skip\" instead."), cmdline);
@@ -1445,6 +1448,36 @@ static void write_commit_patch(const struct am_state *state, struct commit *comm
 }
 
 /**
+ * Writes the diff of the index against HEAD as a patch to the state
+ * directory's "patch" file.
+ */
+static void write_index_patch(const struct am_state *state)
+{
+	struct tree *tree;
+	unsigned char head[GIT_SHA1_RAWSZ];
+	struct rev_info rev_info;
+	FILE *fp;
+
+	if (!get_sha1_tree("HEAD", head))
+		tree = lookup_tree(head);
+	else
+		tree = lookup_tree(EMPTY_TREE_SHA1_BIN);
+
+	fp = xfopen(am_path(state, "patch"), "w");
+	init_revisions(&rev_info, NULL);
+	rev_info.diff = 1;
+	rev_info.disable_stdin = 1;
+	rev_info.no_commit_id = 1;
+	rev_info.diffopt.output_format = DIFF_FORMAT_PATCH;
+	rev_info.diffopt.use_color = 0;
+	rev_info.diffopt.file = fp;
+	rev_info.diffopt.close_file = 1;
+	add_pending_object(&rev_info, &tree->object, "");
+	diff_setup_done(&rev_info.diffopt);
+	run_diff_index(&rev_info, 1);
+}
+
+/**
  * Like parse_mail(), but parses the mail by looking up its commit ID
  * directly. This is used in --rebasing mode to bypass git-mailinfo's munging
  * of patches.
@@ -1681,6 +1714,65 @@ static void do_commit(const struct am_state *state)
 }
 
 /**
+ * Interactively prompt the user on whether the current patch should be
+ * applied.
+ *
+ * Returns 0 if the user chooses to apply the patch, 1 if the user chooses to
+ * skip it.
+ */
+static int do_interactive(struct am_state *state)
+{
+	assert(state->msg);
+
+	if (!isatty(0))
+		die(_("cannot be interactive without stdin connected to a terminal."));
+
+	for (;;) {
+		const char *reply;
+
+		puts(_("Commit Body is:"));
+		puts("--------------------------");
+		printf("%s", state->msg);
+		puts("--------------------------");
+
+		/*
+		 * TRANSLATORS: Make sure to include [y], [n], [e], [v] and [a]
+		 * in your translation. The program will only accept English
+		 * input at this point.
+		 */
+		reply = git_prompt(_("Apply? [y]es/[n]o/[e]dit/[v]iew patch/[a]ccept all: "), PROMPT_ECHO);
+
+		if (!reply) {
+			continue;
+		} else if (*reply == 'y' || *reply == 'Y') {
+			return 0;
+		} else if (*reply == 'a' || *reply == 'A') {
+			state->interactive = 0;
+			return 0;
+		} else if (*reply == 'n' || *reply == 'N') {
+			return 1;
+		} else if (*reply == 'e' || *reply == 'E') {
+			struct strbuf msg = STRBUF_INIT;
+
+			if (!launch_editor(am_path(state, "final-commit"), &msg, NULL)) {
+				free(state->msg);
+				state->msg = strbuf_detach(&msg, &state->msg_len);
+			}
+			strbuf_release(&msg);
+		} else if (*reply == 'v' || *reply == 'V') {
+			const char *pager = git_pager(1);
+			struct child_process cp = CHILD_PROCESS_INIT;
+
+			if (!pager)
+				pager = "cat";
+			argv_array_push(&cp.args, pager);
+			argv_array_push(&cp.args, am_path(state, "patch"));
+			run_command(&cp);
+		}
+	}
+}
+
+/**
  * Applies all queued mail.
  */
 static void am_run(struct am_state *state)
@@ -1717,6 +1809,9 @@ static void am_run(struct am_state *state)
 		write_author_script(state);
 		write_commit_msg(state);
 
+		if (state->interactive && do_interactive(state))
+			goto next;
+
 		if (run_applypatch_msg_hook(state))
 			exit(1);
 
@@ -1808,10 +1903,17 @@ static void am_resolve(struct am_state *state)
 		die_user_resolve(state);
 	}
 
+	if (state->interactive) {
+		write_index_patch(state);
+		if (do_interactive(state))
+			goto next;
+	}
+
 	rerere(0);
 
 	do_commit(state);
 
+next:
 	am_next(state);
 	am_run(state);
 }
@@ -2053,6 +2155,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 	};
 
 	struct option options[] = {
+		OPT_BOOL('i', "interactive", &state.interactive,
+			N_("run interactively")),
 		OPT_BOOL('3', "3way", &state.threeway,
 			N_("allow fall back on 3way merging if needed")),
 		OPT__QUIET(&state.quiet, N_("be quiet")),
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 42/44] builtin-am: implement legacy -b/--binary option
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (40 preceding siblings ...)
  2015-07-07 14:20 ` [PATCH v5 41/44] builtin-am: implement -i/--interactive Paul Tan
@ 2015-07-07 14:21 ` Paul Tan
  2015-07-07 14:21 ` [PATCH v5 43/44] builtin-am: check for valid committer ident Paul Tan
                   ` (4 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:21 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

The -b/--binary option was initially implemented in 087b674 (git-am:
--binary; document --resume and --binary., 2005-11-16). The option will
pass the --binary flag to git-apply to allow it to apply binary patches.

However, in 2b6eef9 (Make apply --binary a no-op., 2006-09-06), --binary
was been made a no-op in git-apply. Following that, since cb3a160
(git-am: ignore --binary option, 2008-08-09), the --binary option in
git-am is ignored as well.

In 6c15a1c (am: officially deprecate -b/--binary option, 2012-03-13),
the --binary option was tweaked to its present behavior: when set, the
message:

	The -b/--binary option has been a no-op for long time, and it
	will be removed. Please do not use it anymore.

will be printed.

Re-implement this in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 builtin/am.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index 2866328..ad07ba4 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2144,6 +2144,7 @@ enum resume_mode {
 int cmd_am(int argc, const char **argv, const char *prefix)
 {
 	struct am_state state;
+	int binary = -1;
 	int keep_cr = -1;
 	int patch_format = PATCH_FORMAT_UNKNOWN;
 	enum resume_mode resume = RESUME_FALSE;
@@ -2157,6 +2158,8 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 	struct option options[] = {
 		OPT_BOOL('i', "interactive", &state.interactive,
 			N_("run interactively")),
+		OPT_HIDDEN_BOOL('b', "binary", &binary,
+			N_("(historical option -- no-op")),
 		OPT_BOOL('3', "3way", &state.threeway,
 			N_("allow fall back on 3way merging if needed")),
 		OPT__QUIET(&state.quiet, N_("be quiet")),
@@ -2257,6 +2260,10 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 
 	argc = parse_options(argc, argv, prefix, options, usage, 0);
 
+	if (binary >= 0)
+		fprintf_ln(stderr, _("The -b/--binary option has been a no-op for long time, and\n"
+				"it will be removed. Please do not use it anymore."));
+
 	if (read_index_preload(&the_index, NULL) < 0)
 		die(_("failed to read the index"));
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 43/44] builtin-am: check for valid committer ident
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (41 preceding siblings ...)
  2015-07-07 14:21 ` [PATCH v5 42/44] builtin-am: implement legacy -b/--binary option Paul Tan
@ 2015-07-07 14:21 ` Paul Tan
  2015-07-07 14:21 ` [PATCH v5 44/44] builtin-am: remove redirection to git-am.sh Paul Tan
                   ` (3 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:21 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

When commit_tree() is called, if the user does not have an explicit
committer ident configured, it will attempt to construct a default
committer ident based on the user's and system's info (e.g. gecos field,
hostname etc.) However, if a default committer ident is unable to be
constructed, commit_tree() will die(), but at this point of git-am's
execution, there will already be changes made to the index and work
tree.

This can be confusing to new users, and as such since d64e6b0 (Keep
Porcelainish from failing by broken ident after making changes.,
2006-02-18) git-am.sh will check to see if the committer ident has been
configured, or a default one can be constructed, before even starting to
apply patches.

Re-implement this in builtin/am.c.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v5
    
    * modified commit message

 builtin/am.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/builtin/am.c b/builtin/am.c
index ad07ba4..a0982d9 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2264,6 +2264,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		fprintf_ln(stderr, _("The -b/--binary option has been a no-op for long time, and\n"
 				"it will be removed. Please do not use it anymore."));
 
+	/* Ensure a valid committer ident can be constructed */
+	git_committer_info(IDENT_STRICT);
+
 	if (read_index_preload(&the_index, NULL) < 0)
 		die(_("failed to read the index"));
 
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* [PATCH v5 44/44] builtin-am: remove redirection to git-am.sh
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (42 preceding siblings ...)
  2015-07-07 14:21 ` [PATCH v5 43/44] builtin-am: check for valid committer ident Paul Tan
@ 2015-07-07 14:21 ` Paul Tan
  2015-07-07 18:52 ` [PATCH v5 00/44] Make git-am a builtin Junio C Hamano
                   ` (2 subsequent siblings)
  46 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 14:21 UTC (permalink / raw)
  To: git; +Cc: Johannes Schindelin, Stefan Beller, Paul Tan

At the beginning of the rewrite of git-am.sh to C, in order to not break
existing test scripts that depended on a functional git-am, a
redirection to git-am.sh was introduced that would activate if the
environment variable _GIT_USE_BUILTIN_AM was not defined.

Now that all of git-am.sh's functionality has been re-implemented in
builtin/am.c, remove this redirection, and retire git-am.sh into
contrib/examples/.

Signed-off-by: Paul Tan <pyokagan@gmail.com>
---
 Makefile                                |  1 -
 builtin/am.c                            | 15 ---------------
 git-am.sh => contrib/examples/git-am.sh |  0
 git.c                                   |  7 +------
 4 files changed, 1 insertion(+), 22 deletions(-)
 rename git-am.sh => contrib/examples/git-am.sh (100%)

diff --git a/Makefile b/Makefile
index ff9bdc0..005d771 100644
--- a/Makefile
+++ b/Makefile
@@ -466,7 +466,6 @@ TEST_PROGRAMS_NEED_X =
 # interactive shell sessions without exporting it.
 unexport CDPATH
 
-SCRIPT_SH += git-am.sh
 SCRIPT_SH += git-bisect.sh
 SCRIPT_SH += git-difftool--helper.sh
 SCRIPT_SH += git-filter-branch.sh
diff --git a/builtin/am.c b/builtin/am.c
index a0982d9..c548129 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2239,21 +2239,6 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 		OPT_END()
 	};
 
-	/*
-	 * NEEDSWORK: Once all the features of git-am.sh have been
-	 * re-implemented in builtin/am.c, this preamble can be removed.
-	 */
-	if (!getenv("_GIT_USE_BUILTIN_AM")) {
-		const char *path = mkpath("%s/git-am", git_exec_path());
-
-		if (sane_execvp(path, (char **)argv) < 0)
-			die_errno("could not exec %s", path);
-	} else {
-		prefix = setup_git_directory();
-		trace_repo_setup(prefix);
-		setup_work_tree();
-	}
-
 	git_config(git_default_config, NULL);
 
 	am_state_init(&state, git_path("rebase-apply"));
diff --git a/git-am.sh b/contrib/examples/git-am.sh
similarity index 100%
rename from git-am.sh
rename to contrib/examples/git-am.sh
diff --git a/git.c b/git.c
index e84e1a1..8420e43 100644
--- a/git.c
+++ b/git.c
@@ -370,12 +370,7 @@ static int run_builtin(struct cmd_struct *p, int argc, const char **argv)
 
 static struct cmd_struct commands[] = {
 	{ "add", cmd_add, RUN_SETUP | NEED_WORK_TREE },
-	/*
-	 * NEEDSWORK: Once the redirection to git-am.sh in builtin/am.c has
-	 * been removed, this entry should be changed to
-	 * RUN_SETUP | NEED_WORK_TREE
-	 */
-	{ "am", cmd_am },
+	{ "am", cmd_am, RUN_SETUP | NEED_WORK_TREE },
 	{ "annotate", cmd_annotate, RUN_SETUP },
 	{ "apply", cmd_apply, RUN_SETUP_GENTLY },
 	{ "archive", cmd_archive },
-- 
2.5.0.rc1.76.gf60a929

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (43 preceding siblings ...)
  2015-07-07 14:21 ` [PATCH v5 44/44] builtin-am: remove redirection to git-am.sh Paul Tan
@ 2015-07-07 18:52 ` Junio C Hamano
  2015-07-07 19:25   ` Paul Tan
  2015-07-08  7:31 ` Junio C Hamano
  2015-07-13 22:31 ` Junio C Hamano
  46 siblings, 1 reply; 63+ messages in thread
From: Junio C Hamano @ 2015-07-07 18:52 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin, Stefan Beller

Paul Tan <pyokagan@gmail.com> writes:

> This patch series depends on pt/pull-builtin.
>
> This is a re-roll of [v4]. Thanks Torsten, Stefan, Junio for the reviews last
> round. Interdiff below.
>
> Previous versions:
>
> [WIP v1] http://thread.gmane.org/gmane.comp.version-control.git/270048
> [WIP v2] http://thread.gmane.org/gmane.comp.version-control.git/271381
> [WIP v3] http://thread.gmane.org/gmane.comp.version-control.git/271967
> [v4] http://thread.gmane.org/gmane.comp.version-control.git/272876
>
> git-am is a commonly used command for applying a series of patches from a
> mailbox to the current branch. Currently, it is implemented by the shell script
> git-am.sh. However, compared to C, shell scripts have certain deficiencies:
> they need to spawn a lot of processes, introduce a lot of dependencies and
> cannot take advantage of git's internal caches.
>
> This patch series rewrites git-am.sh into optimized C builtin/am.c, and is
> part of my GSoC project to rewrite git-pull and git-am into C builtins[1].
>
> [1] https://gist.github.com/pyokagan/1b7b0d1f4dab6ba3cef1

Is it really a rewrite into "optimized C", or just "C"?  I suspect
it is the latter.

This seems to apply cleanly to 'master' but fails to compile, as it
depends on some new stuff that are not even in 'next' yet, e.g.
argv_array_pushv() that is from pt/pull-builtin, and it does not
apply cleanly on top of that branch, either.

I'll see what's the cleanest way to queue this would be.  Perhaps
merge pt/builtin-pull on a copy of 'master' and then apply these, or
something like that.

Thanks.

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-07 18:52 ` [PATCH v5 00/44] Make git-am a builtin Junio C Hamano
@ 2015-07-07 19:25   ` Paul Tan
  0 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-07 19:25 UTC (permalink / raw)
  To: Junio C Hamano; +Cc: Git List, Johannes Schindelin, Stefan Beller

On Wed, Jul 8, 2015 at 2:52 AM, Junio C Hamano <gitster@pobox.com> wrote:
> Paul Tan <pyokagan@gmail.com> writes:
>> This patch series rewrites git-am.sh into optimized C builtin/am.c, and is
>> part of my GSoC project to rewrite git-pull and git-am into C builtins[1].
>>
>> [1] https://gist.github.com/pyokagan/1b7b0d1f4dab6ba3cef1
>
> Is it really a rewrite into "optimized C", or just "C"?  I suspect
> it is the latter.

Well, "optimized" in comparison to the shell script ;-) We don't
replicate the shell script in its entirety, but optimize the code
where it is obvious and sensible. It's not the "most optimized" (and I
will gladly accept any suggestions where there are obvious
optimizations to be made), but I do consider it an improvement in
terms of efficiency, while keeping the overall structure of the code
close to the shell script for easy review.

I'll remove the word though, because it's true that the main purpose
of this patch series is to "make it work" first.

> This seems to apply cleanly to 'master' but fails to compile, as it
> depends on some new stuff that are not even in 'next' yet, e.g.
> argv_array_pushv() that is from pt/pull-builtin, and it does not
> apply cleanly on top of that branch, either.

I tried applying the series, and yeah it conflicts with 1570856
(config.c: avoid xmmap error messages, 2015-05-28) because the
pt/pull-builtin branch in pu is based on an old version of master.
That's the only conflict though, it applies cleanly otherwise.

> I'll see what's the cleanest way to queue this would be.  Perhaps
> merge pt/builtin-pull on a copy of 'master' and then apply these, or
> something like that.

Thanks.

Regards,
Paul

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 18/44] cache-tree: introduce write_index_as_tree()
  2015-07-07 14:20 ` [PATCH v5 18/44] cache-tree: introduce write_index_as_tree() Paul Tan
@ 2015-07-07 20:10   ` Junio C Hamano
  0 siblings, 0 replies; 63+ messages in thread
From: Junio C Hamano @ 2015-07-07 20:10 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin, Stefan Beller

Paul Tan <pyokagan@gmail.com> writes:

> A caller may wish to write a temporary index as a tree. However,
> write_cache_as_tree() assumes that the index was read from, and will
> write to, the default index file path. Introduce write_index_as_tree()
> which removes this limitation by allowing the caller to specify its own
> index_state and index file path.
>
> Signed-off-by: Paul Tan <pyokagan@gmail.com>
> ---
>  cache-tree.c | 29 +++++++++++++++++------------
>  cache-tree.h |  1 +
>  2 files changed, 18 insertions(+), 12 deletions(-)

Makes sense; thanks.

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 19/44] builtin-am: implement --3way, am.threeWay
  2015-07-07 14:20 ` [PATCH v5 19/44] builtin-am: implement --3way, am.threeWay Paul Tan
@ 2015-07-07 20:14   ` Junio C Hamano
  2015-07-14  9:32     ` Paul Tan
  0 siblings, 1 reply; 63+ messages in thread
From: Junio C Hamano @ 2015-07-07 20:14 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin, Stefan Beller

Paul Tan <pyokagan@gmail.com> writes:

> @@ -82,6 +84,8 @@ struct am_state {
>  	/* number of digits in patch filename */
>  	int prec;
>  
> +	int threeway;
> +
>  	int quiet;
>  
>  	int append_signoff;

These "one line surrounded by blank on both sides" starts to get
irritating, and the structure looksq horrifying after you apply all
these patches.  Perhaps have a clean-up patch at the end to make
them look more like this?

struct am_state {
	/* state directory path */
	char *dir;

	/* current and last patch numbers, 1-indexed */
	int cur;
	int last;

	/* commit metadata and message */
	char *author_name;
	char *author_email;
	char *author_date;
	char *msg;
	size_t msg_len;

	/* when --rebasing, records the original commit the patch came from */
	unsigned char orig_commit[GIT_SHA1_RAWSZ];

	/* number of digits in patch filename */
	int prec;

	/* various operating modes and command line options */
	int interactive;
	int threeway;
	int quiet;
	int append_signoff;
	int utf8;
	int committer_date_is_author_date;
	int ignore_date;
	int allow_rerere_autoupdate;
	const char *sign_commit;
	int rebasing;

	/* one of the enum keep_type values */
	int keep;

	/* pass -m flag to git-mailinfo */
	int message_id;

	/* one of the enum scissors_type values */
	int scissors;

        /* used when spawning "git apply" via run_command() */
	struct argv_array git_apply_opts;

	/* override error message when patch failure occurs */
	const char *resolvemsg;
};

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (44 preceding siblings ...)
  2015-07-07 18:52 ` [PATCH v5 00/44] Make git-am a builtin Junio C Hamano
@ 2015-07-08  7:31 ` Junio C Hamano
  2015-07-08  7:44   ` Paul Tan
  2015-07-08  7:48   ` Junio C Hamano
  2015-07-13 22:31 ` Junio C Hamano
  46 siblings, 2 replies; 63+ messages in thread
From: Junio C Hamano @ 2015-07-08  7:31 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin, Stefan Beller

Paul Tan <pyokagan@gmail.com> writes:

> This patch series rewrites git-am.sh into optimized C builtin/am.c, and is
> part of my GSoC project to rewrite git-pull and git-am into C builtins[1].

I merged this to 'jch' (that is somewhere in between 'next' and
'pu', which is what I use for everyday work) and tried it to apply
the 8-patch series that starts at $gmane/273622 on top of 912bd49.

It appears that your builtin version makes "am -3s" barf at the
[PATCH 7/8] in that series, complaining about lack of author
identity.

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-08  7:31 ` Junio C Hamano
@ 2015-07-08  7:44   ` Paul Tan
  2015-07-08  7:48   ` Junio C Hamano
  1 sibling, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-08  7:44 UTC (permalink / raw)
  To: Junio C Hamano; +Cc: Git List, Johannes Schindelin, Stefan Beller

On Wed, Jul 8, 2015 at 3:31 PM, Junio C Hamano <gitster@pobox.com> wrote:
> Paul Tan <pyokagan@gmail.com> writes:
>
>> This patch series rewrites git-am.sh into optimized C builtin/am.c, and is
>> part of my GSoC project to rewrite git-pull and git-am into C builtins[1].
>
> I merged this to 'jch' (that is somewhere in between 'next' and
> 'pu', which is what I use for everyday work) and tried it to apply
> the 8-patch series that starts at $gmane/273622 on top of 912bd49.
>
> It appears that your builtin version makes "am -3s" barf at the
> [PATCH 7/8] in that series, complaining about lack of author
> identity.

Hmm? I compiled jch, and tried to reproduce the problem, but could not
do so. Here's what I did:

git checkout 912bd49
git am -3s mbox
Applying: refs.c: add err arguments to reflog functions
Applying: cherry-pick: treat CHERRY_PICK_HEAD and REVERT_HEAD as refs
Applying: bisect: treat BISECT_HEAD as a ref
Applying: refs: Break out check for reflog autocreation
Applying: refs: new public ref function: safe_create_reflog
Applying: git-reflog: add exists command
Applying: update-ref and tag: add --create-reflog arg
Using index info to reconstruct a base tree...
M    builtin/update-ref.c
Falling back to patching base and 3-way merge...
Auto-merging builtin/update-ref.c
CONFLICT (content): Merge conflict in builtin/update-ref.c
error: Failed to merge in the changes.
Patch failed at 0007 update-ref and tag: add --create-reflog arg
The copy of the patch that failed is found in: .git/rebase-apply/patch
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

... after resolving the conflict ...

git add builtin/update-ref.c
git am --continue
Applying: update-ref and tag: add --create-reflog arg
Applying: git-stash: use update-ref --create-reflog instead of creating files

And it completes successfully.

Thanks,
Paul

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-08  7:31 ` Junio C Hamano
  2015-07-08  7:44   ` Paul Tan
@ 2015-07-08  7:48   ` Junio C Hamano
  2015-07-08  8:19     ` Paul Tan
  1 sibling, 1 reply; 63+ messages in thread
From: Junio C Hamano @ 2015-07-08  7:48 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin, Stefan Beller

Junio C Hamano <gitster@pobox.com> writes:

> Paul Tan <pyokagan@gmail.com> writes:
>
>> This patch series rewrites git-am.sh into optimized C builtin/am.c, and is
>> part of my GSoC project to rewrite git-pull and git-am into C builtins[1].
>
> I merged this to 'jch' (that is somewhere in between 'next' and
> 'pu', which is what I use for everyday work) and tried it to apply
> the 8-patch series that starts at $gmane/273622 on top of 912bd49.
>
> It appears that your builtin version makes "am -3s" barf at the
> [PATCH 7/8] in that series, complaining about lack of author
> identity.

$ git am -s ./+dt
...
error: patch failed: builtin/update-ref.c:421
error: builtin/update-ref.c: patch does not apply
Patch failed at 0007 update-ref and tag: add --create-reflog arg
The copy of the patch that failed is found in:.git/rebase-apply/patch
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
$ git am -3
git: builtin/am.c:1332: parse_mail: Assertion `!state->author_name'
failed.
Aborted (core dumped)

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-08  7:48   ` Junio C Hamano
@ 2015-07-08  8:19     ` Paul Tan
  2015-07-09  6:00       ` Junio C Hamano
  0 siblings, 1 reply; 63+ messages in thread
From: Paul Tan @ 2015-07-08  8:19 UTC (permalink / raw)
  To: Junio C Hamano; +Cc: git, Johannes Schindelin, Stefan Beller

On Wed, Jul 08, 2015 at 12:48:06AM -0700, Junio C Hamano wrote:
> Junio C Hamano <gitster@pobox.com> writes:
> $ git am -s ./+dt
> ...
> error: patch failed: builtin/update-ref.c:421
> error: builtin/update-ref.c: patch does not apply
> Patch failed at 0007 update-ref and tag: add --create-reflog arg
> The copy of the patch that failed is found in:.git/rebase-apply/patch
> When you have resolved this problem, run "git am --continue".
> If you prefer to skip this patch, run "git am --skip" instead.
> To restore the original branch and stop patching, run "git am --abort".
> $ git am -3
> git: builtin/am.c:1332: parse_mail: Assertion `!state->author_name'
> failed.
> Aborted (core dumped)

Ah, it's because parse_mail() does not expect to be called while the
authorship and commit msg fields have been filled up. This is a wrong
assumption, of course.

So the fix would be to remove the assert()s, as follows:

diff --git a/builtin/am.c b/builtin/am.c
index c548129..ab560ab 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1327,16 +1327,20 @@ static int parse_mail(struct am_state *state, const char *mail)
 	if (state->append_signoff)
 		append_signoff(&msg, 0, 0);
 
-	assert(!state->author_name);
+	if (state->author_name)
+		free(state->author_name);
 	state->author_name = strbuf_detach(&author_name, NULL);
 
-	assert(!state->author_email);
+	if (state->author_email)
+		free(state->author_email);
 	state->author_email = strbuf_detach(&author_email, NULL);
 
-	assert(!state->author_date);
+	if (state->author_date)
+		free(state->author_date);
 	state->author_date = strbuf_detach(&author_date, NULL);
 
-	assert(!state->msg);
+	if (state->msg)
+		free(state->msg);
 	state->msg = strbuf_detach(&msg, &state->msg_len);
 
 finish:
@@ -1392,7 +1396,9 @@ static void get_commit_info(struct am_state *state, struct commit *commit)
 		die(_("invalid ident line: %s"), sb.buf);
 	}
 
-	assert(!state->author_name);
+	if (state->author_name)
+		free(state->author_name);
+
 	if (ident_split.name_begin) {
 		strbuf_add(&sb, ident_split.name_begin,
 			ident_split.name_end - ident_split.name_begin);
@@ -1400,7 +1406,9 @@ static void get_commit_info(struct am_state *state, struct commit *commit)
 	} else
 		state->author_name = xstrdup("");
 
-	assert(!state->author_email);
+	if (state->author_email)
+		free(state->author_email);
+
 	if (ident_split.mail_begin) {
 		strbuf_add(&sb, ident_split.mail_begin,
 			ident_split.mail_end - ident_split.mail_begin);
@@ -1410,13 +1418,17 @@ static void get_commit_info(struct am_state *state, struct commit *commit)
 
 	author_date = show_ident_date(&ident_split, DATE_NORMAL);
 	strbuf_addstr(&sb, author_date);
-	assert(!state->author_date);
+
+	if (state->author_date)
+		free(state->author_date);
 	state->author_date = strbuf_detach(&sb, NULL);
 
-	assert(!state->msg);
 	msg = strstr(buffer, "\n\n");
 	if (!msg)
 		die(_("unable to parse commit %s"), sha1_to_hex(commit->object.sha1));
+
+	if (state->msg)
+		free(state->msg);
 	state->msg = xstrdup(msg + 2);
 	state->msg_len = strlen(state->msg);
 }

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-08  8:19     ` Paul Tan
@ 2015-07-09  6:00       ` Junio C Hamano
  2015-07-12 12:29         ` Paul Tan
  0 siblings, 1 reply; 63+ messages in thread
From: Junio C Hamano @ 2015-07-09  6:00 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin, Stefan Beller

Paul Tan <pyokagan@gmail.com> writes:

> So the fix would be to remove the assert()s, as follows:

What I pushed out tonight should have SQUASH??? (or fixup!) that
splits this into appropriate steps in your series.  Please check.

Note that you do not have to say "if the variable has something,
then free it".  free(NULL) is perfectly fine and we can read

	free(var);
        var = compute_new_value();

just fine.

However, I am reluctant to blindly replace assert(!state->field)
with free(state->field).  Are there cases where we _must_ call a
function that sets these fields at most once?

On the other hand, assert() like this is more or less useless.

	assert(state->field);
        ...
        printf("%s", state->field); /* or other uses */

"The caller must have filled the field" can be seen by unconditional
use of "state->field" without such an assert().

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-09  6:00       ` Junio C Hamano
@ 2015-07-12 12:29         ` Paul Tan
  2015-07-12 17:32           ` Junio C Hamano
  0 siblings, 1 reply; 63+ messages in thread
From: Paul Tan @ 2015-07-12 12:29 UTC (permalink / raw)
  To: Junio C Hamano; +Cc: Git List, Johannes Schindelin, Stefan Beller

Hi,

(Sorry for the late reply. Caught a nasty stomach bug that kept me in
bed for a while ><)

On Thu, Jul 9, 2015 at 2:00 PM, Junio C Hamano <gitster@pobox.com> wrote:
> What I pushed out tonight should have SQUASH??? (or fixup!) that
> splits this into appropriate steps in your series.  Please check.

Yeah they look good.

> Note that you do not have to say "if the variable h2as something,
> then free it".  free(NULL) is perfectly fine and we can read
>
>         free(var);
>         var = compute_new_value();
>
> just fine.

OK. There are other places where I used "if (x) free(x)" though (such
as in am_state_release()), so I will fix them in a re-roll as well.

> However, I am reluctant to blindly replace assert(!state->field)
> with free(state->field).  Are there cases where we _must_ call a
> function that sets these fields at most once?

I wouldn't say we are "blindly" replacing them. The purpose of the
assert(!state->field) is to ensure that we are not overwriting any
commit metadata already stored in the state directory. And in almost
all cases, this holds true. However, as you have just shown, running
"git am" again while there is a session in progress will override the
commit metadata stored in the state directory, so I believe the
replacement with free() is reasonable.

> On the other hand, assert() like this is more or less useless.
>
>         assert(state->field);
>         ...
>         printf("%s", state->field); /* or other uses */
>
> "The caller must have filled the field" can be seen by unconditional
> use of "state->field" without such an assert().

OK. Will remove them as well.

Thanks,
Paul

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-12 12:29         ` Paul Tan
@ 2015-07-12 17:32           ` Junio C Hamano
  0 siblings, 0 replies; 63+ messages in thread
From: Junio C Hamano @ 2015-07-12 17:32 UTC (permalink / raw)
  To: Paul Tan; +Cc: Git List, Johannes Schindelin, Stefan Beller

Paul Tan <pyokagan@gmail.com> writes:

>> However, I am reluctant to blindly replace assert(!state->field)
>> with free(state->field).  Are there cases where we _must_ call a
>> function that sets these fields at most once?
>
> I wouldn't say we are "blindly" replacing them.

I said "I was", not "you and me".  If there was a case where we
should never call into a codepath once these fields are already
initialized, then we need to keep assert(!state->field) in such a
codepath.  I didn't know if that were the case, hence I would have
been blindly replacing, which I didn't want to do.  And that is why
I asked _you_ ;-)

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 12/44] builtin-am: implement --skip
  2015-07-07 14:20 ` [PATCH v5 12/44] builtin-am: implement --skip Paul Tan
@ 2015-07-13 19:05   ` Stefan Beller
  2015-07-14  9:34     ` Paul Tan
  0 siblings, 1 reply; 63+ messages in thread
From: Stefan Beller @ 2015-07-13 19:05 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin

On Tue, Jul 7, 2015 at 7:20 AM, Paul Tan <pyokagan@gmail.com> wrote:
> Since d1c5f2a (Add git-am, applymbox replacement., 2005-10-07), git-am
> supported resuming from a failed patch application by skipping the
> current patch. Re-implement this feature by introducing am_skip().
>
> Signed-off-by: Paul Tan <pyokagan@gmail.com>
> ---
>  builtin/am.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 119 insertions(+), 2 deletions(-)
>
> diff --git a/builtin/am.c b/builtin/am.c
> index f21565b..5087094 100644
> --- a/builtin/am.c
> +++ b/builtin/am.c
> @@ -16,6 +16,8 @@
>  #include "commit.h"
>  #include "diff.h"
>  #include "diffcore.h"
> +#include "unpack-trees.h"
> +#include "branch.h"
>
>  /**
>   * Returns 1 if the file is empty or does not exist, 0 otherwise.
> @@ -872,6 +874,114 @@ static void am_resolve(struct am_state *state)
>  }
>
>  /**
> + * Performs a checkout fast-forward from `head` to `remote`. If `reset` is
> + * true, any unmerged entries will be discarded. Returns 0 on success, -1 on
> + * failure.
> + */
> +static int fast_forward_to(struct tree *head, struct tree *remote, int reset)
> +{
> +       struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
> +       struct unpack_trees_options opts;
> +       struct tree_desc t[2];
> +
> +       if (parse_tree(head) || parse_tree(remote))
> +               return -1;
> +
> +       hold_locked_index(lock_file, 1);
> +
> +       refresh_cache(REFRESH_QUIET);
> +
> +       memset(&opts, 0, sizeof(opts));
> +       opts.head_idx = 1;
> +       opts.src_index = &the_index;
> +       opts.dst_index = &the_index;
> +       opts.update = 1;
> +       opts.merge = 1;
> +       opts.reset = reset;
> +       opts.fn = twoway_merge;
> +       init_tree_desc(&t[0], head->buffer, head->size);
> +       init_tree_desc(&t[1], remote->buffer, remote->size);
> +
> +       if (unpack_trees(2, t, &opts)) {
> +               rollback_lock_file(lock_file);
> +               return -1;
> +       }
> +
> +       if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
> +               die(_("unable to write new index file"));
> +
> +       return 0;
> +}
> +
> +/**
> + * Clean the index without touching entries that are not modified between
> + * `head` and `remote`.
> + */
> +static int clean_index(const unsigned char *head, const unsigned char *remote)
> +{
> +       struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
> +       struct tree *head_tree, *remote_tree, *index_tree;
> +       unsigned char index[GIT_SHA1_RAWSZ];
> +       struct pathspec pathspec;
> +
> +       head_tree = parse_tree_indirect(head);
> +       if (!head_tree)
> +               return error(_("Could not parse object '%s'."), sha1_to_hex(head));
> +
> +       remote_tree = parse_tree_indirect(remote);
> +       if (!remote_tree)
> +               return error(_("Could not parse object '%s'."), sha1_to_hex(remote));
> +
> +       read_cache_unmerged();
> +
> +       if (fast_forward_to(head_tree, head_tree, 1))
> +               return -1;
> +
> +       if (write_cache_as_tree(index, 0, NULL))
> +               return -1;
> +
> +       index_tree = parse_tree_indirect(index);
> +       if (!index_tree)
> +               return error(_("Could not parse object '%s'."), sha1_to_hex(index));
> +
> +       if (fast_forward_to(index_tree, remote_tree, 0))
> +               return -1;
> +
> +       memset(&pathspec, 0, sizeof(pathspec));
> +

All returns before this point leak the memory of `lock_file`.

> +       hold_locked_index(lock_file, 1);
> +
> +       if (read_tree(remote_tree, 0, &pathspec)) {
> +               rollback_lock_file(lock_file);
> +               return -1;
> +       }
> +
> +       if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
> +               die(_("unable to write new index file"));
> +
> +       remove_branch_state();
> +
> +       return 0;
> +}
> +
> +/**
> + * Resume the current am session by skipping the current patch.
> + */
> +static void am_skip(struct am_state *state)
> +{
> +       unsigned char head[GIT_SHA1_RAWSZ];
> +
> +       if (get_sha1("HEAD", head))
> +               hashcpy(head, EMPTY_TREE_SHA1_BIN);
> +
> +       if (clean_index(head, head))
> +               die(_("failed to clean index"));
> +
> +       am_next(state);
> +       am_run(state);
> +}
> +
> +/**
>   * parse_options() callback that validates and sets opt->value to the
>   * PATCH_FORMAT_* enum value corresponding to `arg`.
>   */
> @@ -888,7 +998,8 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
>
>  enum resume_mode {
>         RESUME_FALSE = 0,
> -       RESUME_RESOLVED
> +       RESUME_RESOLVED,
> +       RESUME_SKIP
>  };
>
>  int cmd_am(int argc, const char **argv, const char *prefix)
> @@ -899,7 +1010,7 @@ int cmd_am(int argc, const char **argv, const char *prefix)
>
>         const char * const usage[] = {
>                 N_("git am [options] [(<mbox>|<Maildir>)...]"),
> -               N_("git am [options] --continue"),
> +               N_("git am [options] (--continue | --skip)"),
>                 NULL
>         };
>
> @@ -913,6 +1024,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
>                 OPT_CMDMODE('r', "resolved", &resume,
>                         N_("synonyms for --continue"),
>                         RESUME_RESOLVED),
> +               OPT_CMDMODE(0, "skip", &resume,
> +                       N_("skip the current patch"),
> +                       RESUME_SKIP),
>                 OPT_END()
>         };
>
> @@ -968,6 +1082,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
>         case RESUME_RESOLVED:
>                 am_resolve(&state);
>                 break;
> +       case RESUME_SKIP:
> +               am_skip(&state);
> +               break;
>         default:
>                 die("BUG: invalid resume value");
>         }
> --
> 2.5.0.rc1.76.gf60a929
>

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
                   ` (45 preceding siblings ...)
  2015-07-08  7:31 ` Junio C Hamano
@ 2015-07-13 22:31 ` Junio C Hamano
  2015-07-14 10:08   ` Paul Tan
  46 siblings, 1 reply; 63+ messages in thread
From: Junio C Hamano @ 2015-07-13 22:31 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin, Stefan Beller

While using this series for real work today, I found another bug
that is unfortunately a show-stopper for my workflow.

Store 7 patches from David Turner to a file, ./+dt-7, starting at
http://thread.gmane.org/gmane.comp.version-control.git/273786 and
then:

  $ git checkout master...dt/refs-backend-preamble
	... "git checkout 912bd49" is also fine ...
  $ git am -s ./+dt-7

This stops while applying 6th patch, like so:

  Applying: update-ref and tag: add --create-reflog arg
  error: patch failed: builtin/update-ref.c:431
  error: builtin/update-ref.c: patch does not apply
  Patch failed at 0006 update-ref and tag: add --create-reflog arg
  The copy of the patch that failed is found in:
     /usr/local/google/home/jch/w/git.git/.git/rebase-apply/patch
  When you have resolved this problem, run "git am --continue".
  If you prefer to skip this patch, run "git am --skip" instead.
  To restore the original branch and stop patching, run "git am --abort".

This is expected, but the recovery from this state is what goes
wrong.  At this point, one of the usual thing to do is to

  $ edit .git/rebase-apply/patch

and match the offending preimage to what the working tree has.

In this case, the conflict is found near the end of
builtin/update-ref.c, where the call to delete_ref() in the
pre-context of the hunk at around ll.413,+10 was

	return delete_ref(refname, oldval ? oldsha1 : NULL, flags);

but in the newer codebase, the line is split further and the
pre-context would show just

	flags);

the latter of which is what $gmane/273793 expects.  

A fix is to edit the patch to replace that "flags);" line with full
"return delete_ref()" line and save it.  Then running

  $ git am

(no argument) is supposed to read from the corrected patch file and
continue the application.

This no longer works with the version with this series, it seems.

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 19/44] builtin-am: implement --3way, am.threeWay
  2015-07-07 20:14   ` Junio C Hamano
@ 2015-07-14  9:32     ` Paul Tan
  0 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-14  9:32 UTC (permalink / raw)
  To: Junio C Hamano; +Cc: Git List, Johannes Schindelin, Stefan Beller

On Wed, Jul 8, 2015 at 4:14 AM, Junio C Hamano <gitster@pobox.com> wrote:
> Paul Tan <pyokagan@gmail.com> writes:
>
>> @@ -82,6 +84,8 @@ struct am_state {
>>       /* number of digits in patch filename */
>>       int prec;
>>
>> +     int threeway;
>> +
>>       int quiet;
>>
>>       int append_signoff;
>
> These "one line surrounded by blank on both sides" starts to get
> irritating, and the structure looksq horrifying after you apply all
> these patches.  Perhaps have a clean-up patch at the end to make
> them look more like this?
>
> struct am_state {
>         /* state directory path */
>         char *dir;
>
>         /* current and last patch numbers, 1-indexed */
>         int cur;
>         int last;
>
>         /* commit metadata and message */
>         char *author_name;
>         char *author_email;
>         char *author_date;
>         char *msg;
>         size_t msg_len;
>
>         /* when --rebasing, records the original commit the patch came from */
>         unsigned char orig_commit[GIT_SHA1_RAWSZ];
>
>         /* number of digits in patch filename */
>         int prec;
>
>         /* various operating modes and command line options */
>         int interactive;
>         int threeway;
>         int quiet;
>         int append_signoff;
>         int utf8;
>         int committer_date_is_author_date;
>         int ignore_date;
>         int allow_rerere_autoupdate;
>         const char *sign_commit;
>         int rebasing;
>
>         /* one of the enum keep_type values */
>         int keep;
>
>         /* pass -m flag to git-mailinfo */
>         int message_id;
>
>         /* one of the enum scissors_type values */
>         int scissors;
>
>         /* used when spawning "git apply" via run_command() */
>         struct argv_array git_apply_opts;
>
>         /* override error message when patch failure occurs */
>         const char *resolvemsg;

Okay. I would prefer to keep the above fields all in the same block
though, as they are all "various operating modes and command line
options". And in retrospect, the comments don't really add much value,
with the exception of the "enum" comments to make it explicit that we
expect an enum value in that field. So, something like this, perhaps?

struct am_state {
    /* state directory path */
    char *dir;

    /* current and last patch numbers, 1-indexed */
    int cur;
    int last;

    /* commit metadata and message */
    char *author_name;
    char *author_email;
    char *author_date;
    char *msg;
    size_t msg_len;

    /* when --rebasing, records the original commit the patch came from */
    unsigned char orig_commit[GIT_SHA1_RAWSZ];

    /* number of digits in patch filename */
    int prec;

    /* various operating modes and command line options */
    int interactive;
    int threeway;
    int quiet;
    int append_signoff;
    int utf8;
    int keep; /* enum keep_type */
    int message_id;
    int scissors; /* enum scissors_type */
    struct argv_array git_apply_opts;
    const char *resolvemsg;
    int committer_date_is_author_date;
    int ignore_date;
    int allow_rerere_autoupdate;
    const char *sign_commit;
    int rebasing;
};

Thanks,
Paul

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 12/44] builtin-am: implement --skip
  2015-07-13 19:05   ` Stefan Beller
@ 2015-07-14  9:34     ` Paul Tan
  2015-07-14 16:54       ` Stefan Beller
  0 siblings, 1 reply; 63+ messages in thread
From: Paul Tan @ 2015-07-14  9:34 UTC (permalink / raw)
  To: Stefan Beller; +Cc: git, Johannes Schindelin

On Tue, Jul 14, 2015 at 3:05 AM, Stefan Beller <sbeller@google.com> wrote:
> All returns before this point leak the memory of `lock_file`.

Yeah, it's intentional. From Documentation/technical/api-lockfile.txt:

* Allocates a `struct lock_file` either as a static variable or on the
  heap, initialized to zeros. Once you use the structure to call the
  `hold_lock_file_*` family of functions, it belongs to the lockfile
  subsystem and its storage must remain valid throughout the life of
  the program (i.e. you cannot use an on-stack variable to hold this
  structure).

Thanks,
Paul

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 00/44] Make git-am a builtin
  2015-07-13 22:31 ` Junio C Hamano
@ 2015-07-14 10:08   ` Paul Tan
  0 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-14 10:08 UTC (permalink / raw)
  To: Junio C Hamano; +Cc: git, Johannes Schindelin, Stefan Beller

On Mon, Jul 13, 2015 at 03:31:37PM -0700, Junio C Hamano wrote:
> A fix is to edit the patch to replace that "flags);" line with full
> "return delete_ref()" line and save it.  Then running
> 
>   $ git am
> 
> (no argument) is supposed to read from the corrected patch file and
> continue the application.
> 
> This no longer works with the version with this series, it seems.

Ah, this is actually the same bug as the previous one, and it actually
all stems from the fact that I completely overlooked the code path
change introduced by 271440e (git-am: make it easier after fixing up an
unapplicable patch., 2005-10-25). When "git am" is run again while
paused, the mail message should not be re-parsed at all.

So, I'm thinking of something like the following as a separate patch in
this series to re-implement the feature:

diff a/builtin/am.c b/builtin/am.c
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1714,6 +1692,21 @@ static void do_commit(const struct am_state *state)
 }
 
 /**
+ * Validates the am_state for resuming -- the "msg" and authorship fields must
+ * be filled up.
+ */
+static void validate_resume_state(const struct am_state *state)
+{
+	if (!state->msg)
+		die(_("cannot resume: %s does not exist."),
+			am_path(state, "final-commit"));
+
+	if (!state->author_name || !state->author_email || !state->author_date)
+		die(_("cannot resume: %s does not exist."),
+			am_path(state, "author-script"));
+}
+
+/**
  * Interactively prompt the user on whether the current patch should be
  * applied.
  *
@@ -1774,8 +1767,12 @@ static int do_interactive(struct am_state *state)
 
 /**
  * Applies all queued mail.
+ *
+ * If `resume` is true, we are "resuming". The "msg" and authorship fields, as
+ * well as the state directory's "patch" file is used as-is for applying the
+ * patch and committing it.
  */
-static void am_run(struct am_state *state)
+static void am_run(struct am_state *state, int resume)
 {
 	const char *argv_gc_auto[] = {"gc", "--auto", NULL};
 	struct strbuf sb = STRBUF_INIT;
@@ -1793,21 +1790,28 @@ static void am_run(struct am_state *state)
 
 	while (state->cur <= state->last) {
 		const char *mail = am_path(state, msgnum(state));
-		int apply_status, skip;
+		int apply_status;
 
 		if (!file_exists(mail))
 			goto next;
 
-		if (state->rebasing)
-			skip = parse_mail_rebase(state, mail);
-		else
-			skip = parse_mail(state, mail);
+		if (resume) {
+			validate_resume_state(state);
+			resume = 0;
+		} else {
+			int skip;
+
+			if (state->rebasing)
+				skip = parse_mail_rebase(state, mail);
+			else
+				skip = parse_mail(state, mail);
 
-		if (skip)
-			goto next; /* mail should be skipped */
+			if (skip)
+				goto next; /* mail should be skipped */
 
-		write_author_script(state);
-		write_commit_msg(state);
+			write_author_script(state);
+			write_commit_msg(state);
+		}
 
 		if (state->interactive && do_interactive(state))
 			goto next;
@@ -1880,13 +1884,7 @@ next:
  */
 static void am_resolve(struct am_state *state)
 {
-	if (!state->msg)
-		die(_("cannot resume: %s does not exist."),
-			am_path(state, "final-commit"));
-
-	if (!state->author_name || !state->author_email || !state->author_date)
-		die(_("cannot resume: %s does not exist."),
-			am_path(state, "author-script"));
+	validate_resume_state(state);
 
 	say(state, stdout, _("Applying: %.*s"), linelen(state->msg), state->msg);
 
@@ -1915,7 +1913,7 @@ static void am_resolve(struct am_state *state)
 
 next:
 	am_next(state);
-	am_run(state);
+	am_run(state, 0);
 }
 
 /**
@@ -2040,7 +2038,7 @@ static void am_skip(struct am_state *state)
 		die(_("failed to clean index"));
 
 	am_next(state);
-	am_run(state);
+	am_run(state, 0);
 }
 
 /**
@@ -2136,6 +2134,7 @@ static int parse_opt_patchformat(const struct option *opt, const char *arg, int
 
 enum resume_mode {
 	RESUME_FALSE = 0,
+	RESUME_APPLY,
 	RESUME_RESOLVED,
 	RESUME_SKIP,
 	RESUME_ABORT
@@ -2271,6 +2270,9 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 			die(_("previous rebase directory %s still exists but mbox given."),
 				state.dir);
 
+		if (resume == RESUME_FALSE)
+			resume = RESUME_APPLY;
+
 		am_load(&state);
 	} else {
 		struct argv_array paths = ARGV_ARRAY_INIT;
@@ -2310,7 +2312,10 @@ int cmd_am(int argc, const char **argv, const char *prefix)
 
 	switch (resume) {
 	case RESUME_FALSE:
-		am_run(&state);
+		am_run(&state, 0);
+		break;
+	case RESUME_APPLY:
+		am_run(&state, 1);
 		break;
 	case RESUME_RESOLVED:
 		am_resolve(&state);

At this point I've accumulated a lot of changes on my end so I'll do a
re-roll.

Thanks,
Paul

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 12/44] builtin-am: implement --skip
  2015-07-14  9:34     ` Paul Tan
@ 2015-07-14 16:54       ` Stefan Beller
  2015-07-18 15:22         ` Paul Tan
  0 siblings, 1 reply; 63+ messages in thread
From: Stefan Beller @ 2015-07-14 16:54 UTC (permalink / raw)
  To: Paul Tan; +Cc: git, Johannes Schindelin

On Tue, Jul 14, 2015 at 2:34 AM, Paul Tan <pyokagan@gmail.com> wrote:
> On Tue, Jul 14, 2015 at 3:05 AM, Stefan Beller <sbeller@google.com> wrote:
>> All returns before this point leak the memory of `lock_file`.
>
> Yeah, it's intentional. From Documentation/technical/api-lockfile.txt:
>
> * Allocates a `struct lock_file` either as a static variable or on the
>   heap, initialized to zeros. Once you use the structure to call the
>   `hold_lock_file_*` family of functions, it belongs to the lockfile
>   subsystem and its storage must remain valid throughout the life of
>   the program (i.e. you cannot use an on-stack variable to hold this
>   structure).
>
> Thanks,
> Paul

So what I meant to suggest, was to only allocate the memory if we really need it
by moving the allocation further down.

static int clean_index(const unsigned char *head, const unsigned char *remote)
{
       struct lock_file *lock_file;
...
... // includes return -1, which would not leak the memory already allocated
...
       lock_file = xalloc (...);
       hold_locked_index(lock_file, 1);

^ permalink raw reply	[flat|nested] 63+ messages in thread

* Re: [PATCH v5 12/44] builtin-am: implement --skip
  2015-07-14 16:54       ` Stefan Beller
@ 2015-07-18 15:22         ` Paul Tan
  0 siblings, 0 replies; 63+ messages in thread
From: Paul Tan @ 2015-07-18 15:22 UTC (permalink / raw)
  To: Stefan Beller; +Cc: git, Johannes Schindelin

On Tue, Jul 14, 2015 at 09:54:10AM -0700, Stefan Beller wrote:
> So what I meant to suggest, was to only allocate the memory if we really need it
> by moving the allocation further down.
> 
> static int clean_index(const unsigned char *head, const unsigned char *remote)
> {
>        struct lock_file *lock_file;
> ...
> ... // includes return -1, which would not leak the memory already allocated
> ...
>        lock_file = xalloc (...);
>        hold_locked_index(lock_file, 1);

Ah, sorry, I misinterpreted your message ><. Thanks for catching this.

I've moved all the lock file memory allocation to just before the
hold_locked_index() calls on my end.

diff --git a/builtin/am.c b/builtin/am.c
index c597325..dc8e862 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1138,13 +1138,12 @@ static const char *msgnum(const struct am_state *state)
  */
 static void refresh_and_write_cache(void)
 {
-	static struct lock_file lock_file;
+	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
 
-	hold_locked_index(&lock_file, 1);
+	hold_locked_index(lock_file, 1);
 	refresh_cache(REFRESH_QUIET);
-	if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
+	if (write_locked_index(&the_index, lock_file, COMMIT_LOCK))
 		die(_("unable to write index file"));
-	rollback_lock_file(&lock_file);
 }
 
 /**
@@ -1923,13 +1922,14 @@ next:
  */
 static int fast_forward_to(struct tree *head, struct tree *remote, int reset)
 {
-	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+	struct lock_file *lock_file;
 	struct unpack_trees_options opts;
 	struct tree_desc t[2];
 
 	if (parse_tree(head) || parse_tree(remote))
 		return -1;
 
+	lock_file = xcalloc(1, sizeof(struct lock_file));
 	hold_locked_index(lock_file, 1);
 
 	refresh_cache(REFRESH_QUIET);
@@ -1962,7 +1962,7 @@ static int fast_forward_to(struct tree *head, struct tree *remote, int reset)
  */
 static int clean_index(const unsigned char *head, const unsigned char *remote)
 {
-	struct lock_file *lock_file = xcalloc(1, sizeof(struct lock_file));
+	struct lock_file *lock_file;
 	struct tree *head_tree, *remote_tree, *index_tree;
 	unsigned char index[GIT_SHA1_RAWSZ];
 	struct pathspec pathspec;
@@ -1992,6 +1992,7 @@ static int clean_index(const unsigned char *head, const unsigned char *remote)
 
 	memset(&pathspec, 0, sizeof(pathspec));
 
+	lock_file = xcalloc(1, sizeof(struct lock_file));
 	hold_locked_index(lock_file, 1);
 
 	if (read_tree(remote_tree, 0, &pathspec)) {

Thanks,
Paul

^ permalink raw reply	[flat|nested] 63+ messages in thread

end of thread, other threads:[~2015-07-18 15:23 UTC | newest]

Thread overview: 63+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-07-07 14:20 [PATCH v5 00/44] Make git-am a builtin Paul Tan
2015-07-07 14:20 ` [PATCH v5 01/44] wrapper: implement xopen() Paul Tan
2015-07-07 14:20 ` [PATCH v5 02/44] wrapper: implement xfopen() Paul Tan
2015-07-07 14:20 ` [PATCH v5 03/44] builtin-am: implement skeletal builtin am Paul Tan
2015-07-07 14:20 ` [PATCH v5 04/44] builtin-am: implement patch queue mechanism Paul Tan
2015-07-07 14:20 ` [PATCH v5 05/44] builtin-am: split out mbox/maildir patches with git-mailsplit Paul Tan
2015-07-07 14:20 ` [PATCH v5 06/44] builtin-am: auto-detect mbox patches Paul Tan
2015-07-07 14:20 ` [PATCH v5 07/44] builtin-am: extract patch and commit info with git-mailinfo Paul Tan
2015-07-07 14:20 ` [PATCH v5 08/44] builtin-am: apply patch with git-apply Paul Tan
2015-07-07 14:20 ` [PATCH v5 09/44] builtin-am: implement committing applied patch Paul Tan
2015-07-07 14:20 ` [PATCH v5 10/44] builtin-am: refuse to apply patches if index is dirty Paul Tan
2015-07-07 14:20 ` [PATCH v5 11/44] builtin-am: implement --resolved/--continue Paul Tan
2015-07-07 14:20 ` [PATCH v5 12/44] builtin-am: implement --skip Paul Tan
2015-07-13 19:05   ` Stefan Beller
2015-07-14  9:34     ` Paul Tan
2015-07-14 16:54       ` Stefan Beller
2015-07-18 15:22         ` Paul Tan
2015-07-07 14:20 ` [PATCH v5 13/44] builtin-am: implement --abort Paul Tan
2015-07-07 14:20 ` [PATCH v5 14/44] builtin-am: reject patches when there's a session in progress Paul Tan
2015-07-07 14:20 ` [PATCH v5 15/44] builtin-am: implement -q/--quiet Paul Tan
2015-07-07 14:20 ` [PATCH v5 16/44] builtin-am: exit with user friendly message on failure Paul Tan
2015-07-07 14:20 ` [PATCH v5 17/44] builtin-am: implement -s/--signoff Paul Tan
2015-07-07 14:20 ` [PATCH v5 18/44] cache-tree: introduce write_index_as_tree() Paul Tan
2015-07-07 20:10   ` Junio C Hamano
2015-07-07 14:20 ` [PATCH v5 19/44] builtin-am: implement --3way, am.threeWay Paul Tan
2015-07-07 20:14   ` Junio C Hamano
2015-07-14  9:32     ` Paul Tan
2015-07-07 14:20 ` [PATCH v5 20/44] builtin-am: implement --rebasing mode Paul Tan
2015-07-07 14:20 ` [PATCH v5 21/44] builtin-am: bypass git-mailinfo when --rebasing Paul Tan
2015-07-07 14:20 ` [PATCH v5 22/44] builtin-am: handle stray state directory Paul Tan
2015-07-07 14:20 ` [PATCH v5 23/44] builtin-am: implement -u/--utf8 Paul Tan
2015-07-07 14:20 ` [PATCH v5 24/44] builtin-am: implement -k/--keep, --keep-non-patch Paul Tan
2015-07-07 14:20 ` [PATCH v5 25/44] builtin-am: implement --[no-]message-id, am.messageid Paul Tan
2015-07-07 14:20 ` [PATCH v5 26/44] builtin-am: support --keep-cr, am.keepcr Paul Tan
2015-07-07 14:20 ` [PATCH v5 27/44] builtin-am: implement --[no-]scissors Paul Tan
2015-07-07 14:20 ` [PATCH v5 28/44] builtin-am: pass git-apply's options to git-apply Paul Tan
2015-07-07 14:20 ` [PATCH v5 29/44] builtin-am: implement --ignore-date Paul Tan
2015-07-07 14:20 ` [PATCH v5 30/44] builtin-am: implement --committer-date-is-author-date Paul Tan
2015-07-07 14:20 ` [PATCH v5 31/44] builtin-am: implement -S/--gpg-sign, commit.gpgsign Paul Tan
2015-07-07 14:20 ` [PATCH v5 32/44] builtin-am: invoke post-rewrite hook Paul Tan
2015-07-07 14:20 ` [PATCH v5 33/44] builtin-am: support automatic notes copying Paul Tan
2015-07-07 14:20 ` [PATCH v5 34/44] builtin-am: invoke applypatch-msg hook Paul Tan
2015-07-07 14:20 ` [PATCH v5 35/44] builtin-am: invoke pre-applypatch hook Paul Tan
2015-07-07 14:20 ` [PATCH v5 36/44] builtin-am: invoke post-applypatch hook Paul Tan
2015-07-07 14:20 ` [PATCH v5 37/44] builtin-am: rerere support Paul Tan
2015-07-07 14:20 ` [PATCH v5 38/44] builtin-am: support and auto-detect StGit patches Paul Tan
2015-07-07 14:20 ` [PATCH v5 39/44] builtin-am: support and auto-detect StGit series files Paul Tan
2015-07-07 14:20 ` [PATCH v5 40/44] builtin-am: support and auto-detect mercurial patches Paul Tan
2015-07-07 14:20 ` [PATCH v5 41/44] builtin-am: implement -i/--interactive Paul Tan
2015-07-07 14:21 ` [PATCH v5 42/44] builtin-am: implement legacy -b/--binary option Paul Tan
2015-07-07 14:21 ` [PATCH v5 43/44] builtin-am: check for valid committer ident Paul Tan
2015-07-07 14:21 ` [PATCH v5 44/44] builtin-am: remove redirection to git-am.sh Paul Tan
2015-07-07 18:52 ` [PATCH v5 00/44] Make git-am a builtin Junio C Hamano
2015-07-07 19:25   ` Paul Tan
2015-07-08  7:31 ` Junio C Hamano
2015-07-08  7:44   ` Paul Tan
2015-07-08  7:48   ` Junio C Hamano
2015-07-08  8:19     ` Paul Tan
2015-07-09  6:00       ` Junio C Hamano
2015-07-12 12:29         ` Paul Tan
2015-07-12 17:32           ` Junio C Hamano
2015-07-13 22:31 ` Junio C Hamano
2015-07-14 10:08   ` Paul Tan

Code repositories for project(s) associated with this inbox:

	https://80x24.org/mirrors/git.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).