From: Paul Tan <pyokagan@gmail.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Git List <git@vger.kernel.org>,
Johannes Schindelin <johannes.schindelin@gmx.de>,
Stefan Beller <sbeller@google.com>
Subject: Re: [PATCH/WIP v3 07/31] am: extract patch, message and authorship with git-mailinfo
Date: Wed, 24 Jun 2015 15:54:46 +0800 [thread overview]
Message-ID: <20150624075446.GA1964@yoshi.chippynet.com> (raw)
In-Reply-To: <xmqq1th7brsj.fsf@gitster.dls.corp.google.com>
Okay, let's focus only on the API design issues.
For the record, I'm not completely satisfied with the current code
organization and API, however I don't have really good ideas at hand to
improve it, so any ideas with examples would be appreciated.
On Fri, Jun 19, 2015 at 09:13:00AM -0700, Junio C Hamano wrote:
> Paul Tan <pyokagan@gmail.com> writes:
> With the above fields, it is clear that the above fields are
> per-message thing. So the loop to process multiple messages is
> conceptually:
>
>
> set up the entire am_state (for things like cur=1, last=N)
> for each message {
> update per-message fields like cur, author, msg, etc.
> process the single message
> clean up per-message fileds like cur++, free(msg), etc.
> }
> tear down the entire am_state
>
> Reusing the same strbuf and rely on them to clean up after
> themselves is simply a bad taste.
Hmm, reading "reusing the same strbuf" makes me wonder if I'm
misunderstanding something. Do you mean that:
1. We should release the memory in state->msg, state->author_* after
processing each message? Because that is what am_next() already does.
Granted, it does strbuf_reset(), but it could just as well be
strbuf_release().
or
2. The per-message fields (state->msg, state->author_*) should become
local variables in am_run()?
or
3. I'm over-thinking this and you just want the "struct strbufs" in the
struct am_state to be switched to "char*"s? If that is so, I've
attached a sample patch below.
For (2), my idea is that am_state represents the contents of the state
directory at any point in time -- a design feature carried over from
git-am.sh. This is why parse_patch() modifies the am_state struct
directly -- the "msg" and "author_*" fields would be written to the
"final-commit" and "author-script" files directly after.
I think it would be confusing if we don't update the am_state struct
directly, as we will never know if the "am_state struct" contains the
actual current state of the patch application session.
(On a somewhat related thought, currently we do write_file() all over
the place, which is really ugly. I'm leaning heavily on introducing an
am_save() function, for "I don't care how it is done but just update the
contents of the am state directory so that it matches the contents of
the struct am_state". To save pointless writes, we can compare the
am_state with the last-written/loaded am_state, so we only write the
files that have changed. What do others think?)
> More importantly, we'd want to make sure that people who will be
> touching the "process the single message" part in the above loop to
> think twice before mucking with read-only fields like author.
Okay, I understand and agree with your reasoning.
However, note that this "process the single message" part consists
solely of run_apply() and do_commit(). Both of them take a
"const struct am_state*", which means that the compiler will warn/fail
if anybody tries to touch any of the fields in the am_state. This
extends to strbufs as well. Isn't this already safe enough? Or do you
want this safety to extend throughout am_run() as well?
> If they are "char *", they would need to allocate new storage
> themselves, format a new value into there, free the original, and
> replace the field with the new value. It takes a conscious effort
> and very much visible code and would be clear to reviewers what is
> going on, and gives them a chance to question if it is a good idea
> to update things in-place in the first place.
Okay, although personally I think reviewers may tend to miss out that a
single line like:
state->msg = strbuf_detach(&sb, NULL);
introduces a memory leak.
> If you left it in strbuf, that invites "let's extend it temporarily
> with strbuf_add() and then return to the original once I am done
> with this single step", which is an entry to a slippery slope to
> "let's extend it with strbuf_add() for my purpose, and I do not even
> bother to clean up because I know I am the last person to touch
> this".
>
> So, no, please don't leave a field that won't change during the bulk
> of the processing in strbuf, unless you have a compelling reason to
> do so (and "compelling reasons" are pretty much limited to "after
> all, that field we originally thought it won't change is something
> we need to change very often").
Anyway, assuming that you just want the strbufs in the am_state struct
to be switched to "char*"s, here's a quick diff of the result. Can I
confirm that this is the direction that you want to take? (since the
changes are throughout the entire patch series)
Regards,
Paul
--- >8 ---
builtin/am.c | 202 ++++++++++++++++++++++++++++++++++++++---------------------
1 file changed, 131 insertions(+), 71 deletions(-)
diff --git a/builtin/am.c b/builtin/am.c
index f55dd14..944e35a 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -98,10 +98,10 @@ struct am_state {
int last;
/* commit message and metadata */
- struct strbuf author_name;
- struct strbuf author_email;
- struct strbuf author_date;
- struct strbuf msg;
+ char *author_name;
+ char *author_email;
+ char *author_date;
+ char *msg;
/* number of digits in patch filename */
int prec;
@@ -148,10 +148,10 @@ static void am_state_init(struct am_state *state, const char *dir)
state->dir = xstrdup_or_null(dir);
- strbuf_init(&state->author_name, 0);
- strbuf_init(&state->author_email, 0);
- strbuf_init(&state->author_date, 0);
- strbuf_init(&state->msg, 0);
+ state->author_name = NULL;
+ state->author_email = NULL;
+ state->author_date = NULL;
+ state->msg = NULL;
state->prec = 4;
@@ -177,10 +177,17 @@ static void am_state_release(struct am_state *state)
if (state->dir)
free(state->dir);
- strbuf_release(&state->author_name);
- strbuf_release(&state->author_email);
- strbuf_release(&state->author_date);
- strbuf_release(&state->msg);
+ 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);
argv_array_clear(&state->git_apply_opts);
}
@@ -250,37 +257,32 @@ static int read_state_file(struct strbuf *sb, const char *file, size_t hint, int
}
/**
- * Reads a KEY=VALUE shell variable assignment from fp, and returns the VALUE
- * in `value`. VALUE must be a quoted string, and the KEY must match `key`.
- * Returns 0 on success, -1 on failure.
+ * 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 int read_shell_var(struct strbuf *value, FILE *fp, const char *key)
+static char *read_shell_var(FILE *fp, const char *key)
{
struct strbuf sb = STRBUF_INIT;
char *str;
if (strbuf_getline(&sb, fp, '\n'))
- return -1;
+ return NULL;
if (!skip_prefix(sb.buf, key, (const char **)&str))
- return -1;
+ return NULL;
if (!skip_prefix(str, "=", (const char **)&str))
- return -1;
+ return NULL;
str = sq_dequote(str);
if (!str)
- return -1;
-
- strbuf_reset(value);
- strbuf_addstr(value, str);
+ return NULL;
- strbuf_release(&sb);
-
- return 0;
+ return strbuf_detach(&sb, NULL);
}
/**
@@ -307,13 +309,25 @@ static int read_author_script(struct am_state *state)
die_errno(_("could not open '%s' for reading"), filename);
}
- if (read_shell_var(&state->author_name, fp, "GIT_AUTHOR_NAME"))
+ if (state->author_name)
+ free(state->author_name);
+
+ state->author_name = read_shell_var(fp, "GIT_AUTHOR_NAME");
+ if (!state->author_name)
return -1;
- if (read_shell_var(&state->author_email, fp, "GIT_AUTHOR_EMAIL"))
+ if (state->author_email)
+ free(state->author_email);
+
+ state->author_email = read_shell_var(fp, "GIT_AUTHOR_EMAIL");
+ if (!state->author_email)
return -1;
- if (read_shell_var(&state->author_date, fp, "GIT_AUTHOR_DATE"))
+ if (state->author_date)
+ free(state->author_date);
+
+ state->author_date = read_shell_var(fp, "GIT_AUTHOR_DATE");
+ if (!state->author_date)
return -1;
if (fgetc(fp) != EOF)
@@ -336,9 +350,9 @@ static void write_author_script(const struct am_state *state)
struct strbuf author_email = STRBUF_INIT;
struct strbuf author_date = STRBUF_INIT;
- sq_quote_buf(&author_name, state->author_name.buf);
- sq_quote_buf(&author_email, state->author_email.buf);
- sq_quote_buf(&author_date, state->author_date.buf);
+ sq_quote_buf(&author_name, state->author_name);
+ sq_quote_buf(&author_email, state->author_email);
+ sq_quote_buf(&author_date, state->author_date);
write_file(am_path(state, "author-script"), 1, fmt,
author_name.buf, author_email.buf, author_date.buf);
@@ -364,7 +378,10 @@ static void am_load(struct am_state *state)
if (read_author_script(state) < 0)
die(_("could not parse author script"));
- read_state_file(&state->msg, am_path(state, "final-commit"), 0, 0);
+ read_state_file(&sb, am_path(state, "final-commit"), 0, 0);
+ if (state->msg)
+ free(state->msg);
+ state->msg = strbuf_detach(&sb, NULL);
read_state_file(&sb, am_path(state, "threeway"), 2, 1);
state->threeway = !strcmp(sb.buf, "t");
@@ -670,12 +687,24 @@ static void am_next(struct am_state *state)
state->cur++;
write_file(am_path(state, "next"), 1, "%d", state->cur);
- strbuf_reset(&state->author_name);
- strbuf_reset(&state->author_email);
- strbuf_reset(&state->author_date);
+ 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;
+
unlink(am_path(state, "author-script"));
- strbuf_reset(&state->msg);
+ if (state->msg)
+ free(state->msg);
+ state->msg = NULL;
+
unlink(am_path(state, "final-commit"));
if (!get_sha1("HEAD", head))
@@ -762,6 +791,10 @@ static int parse_patch(struct am_state *state, const char *patch)
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;
cp.git_cmd = 1;
cp.in = xopen(patch, O_RDONLY, 0);
@@ -813,20 +846,32 @@ static int parse_patch(struct am_state *state, const char *patch)
const char *x;
if (skip_prefix(sb.buf, "Subject: ", &x)) {
- if (state->msg.len)
- strbuf_addch(&state->msg, '\n');
- strbuf_addstr(&state->msg, x);
+ if (msg.len)
+ strbuf_addch(&msg, '\n');
+ strbuf_addstr(&msg, x);
} else if (skip_prefix(sb.buf, "Author: ", &x))
- strbuf_addstr(&state->author_name, x);
+ strbuf_addstr(&author_name, x);
else if (skip_prefix(sb.buf, "Email: ", &x))
- strbuf_addstr(&state->author_email, x);
+ strbuf_addstr(&author_email, x);
else if (skip_prefix(sb.buf, "Date: ", &x))
- strbuf_addstr(&state->author_date, x);
+ strbuf_addstr(&author_date, x);
}
fclose(fp);
+ if (state->author_name)
+ free(state->author_name);
+ state->author_name = strbuf_detach(&author_name, NULL);
+
+ if (state->author_email)
+ free(state->author_email);
+ state->author_email = strbuf_detach(&author_email, NULL);
+
+ if (state->author_date)
+ free(state->author_date);
+ state->author_date = strbuf_detach(&author_date, NULL);
+
/* Skip pine's internal folder data */
- if (!strcmp(state->author_name.buf, "Mail System Internal Data"))
+ if (!strcmp(state->author_name, "Mail System Internal Data"))
return 1;
if (is_empty_file(am_path(state, "patch")))
@@ -834,13 +879,17 @@ static int parse_patch(struct am_state *state, const char *patch)
"If you would prefer to skip this patch, instead run \"git am --skip\".\n"
"To restore the original branch and stop patching run \"git am --abort\"."));
- strbuf_addstr(&state->msg, "\n\n");
- if (strbuf_read_file(&state->msg, am_path(state, "msg"), 0) < 0)
+ 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(&state->msg, 0);
+ stripspace(&msg, 0);
if (state->sign)
- append_signoff(&state->msg, 0, 0);
+ append_signoff(&msg, 0, 0);
+
+ if (state->msg)
+ free(state->msg);
+ state->msg = strbuf_detach(&msg, NULL);
return 0;
}
@@ -876,6 +925,9 @@ static int get_patch_commit_sha1(unsigned char *commit_id, const char *patch)
static void get_commit_info(struct am_state *state, struct commit *commit)
{
const char *buf, *begin, *end;
+ struct strbuf author_name = STRBUF_INIT;
+ struct strbuf author_email = STRBUF_INIT;
+ struct strbuf author_date = STRBUF_INIT;
buf = logmsg_reencode(commit, NULL, get_commit_output_encoding());
begin = end = buf;
@@ -895,24 +947,36 @@ static void get_commit_info(struct am_state *state, struct commit *commit)
}
if (split.name_begin)
- strbuf_add(&state->author_name,
- split.name_begin,
+ strbuf_add(&author_name, split.name_begin,
split.name_end - split.name_begin);
if (split.mail_begin)
- strbuf_add(&state->author_email,
- split.mail_begin,
+ strbuf_add(&author_email, split.mail_begin,
split.mail_end - split.mail_begin);
date = show_ident_date(&split, DATE_NORMAL);
- strbuf_addstr(&state->author_date, date);
+ strbuf_addstr(&author_date, date);
} else if (begin == end) {
end++;
break;
}
}
- strbuf_addstr(&state->msg, end);
+ if (state->author_name)
+ free(state->author_name);
+ state->author_name = strbuf_detach(&author_name, NULL);
+
+ if (state->author_email)
+ free(state->author_email);
+ state->author_email = strbuf_detach(&author_email, NULL);
+
+ if (state->author_date)
+ free(state->author_date);
+ state->author_date = strbuf_detach(&author_date, NULL);
+
+ if (state->msg)
+ free(state->msg);
+ state->msg = xstrdup(end);
}
/**
@@ -1107,7 +1171,7 @@ static int fall_back_threeway(const struct am_state *state, const char *index_pa
init_merge_options(&o);
o.branch1 = "HEAD";
- his_tree_name = xstrfmt("%.*s", linelen(state->msg.buf), state->msg.buf);
+ his_tree_name = xstrfmt("%.*s", linelen(state->msg), state->msg);
o.branch2 = his_tree_name;
if (state->quiet)
@@ -1147,15 +1211,15 @@ static void do_commit(const struct am_state *state)
say(state, stderr, _("applying to an empty history"));
}
- author = fmt_ident(state->author_name.buf, state->author_email.buf,
- state->ignore_date ? NULL : state->author_date.buf,
+ author = fmt_ident(state->author_name, state->author_email,
+ 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.buf, 1);
+ state->ignore_date ? "" : state->author_date, 1);
- if (commit_tree(state->msg.buf, state->msg.len, tree, parents, commit,
+ if (commit_tree(state->msg, strlen(state->msg), tree, parents, commit,
author, state->sign_commit))
die(_("failed to write commit object"));
@@ -1163,8 +1227,8 @@ static void do_commit(const struct am_state *state)
if (!reflog_msg)
reflog_msg = "am";
- strbuf_addf(&sb, "%s: %.*s", reflog_msg, linelen(state->msg.buf),
- state->msg.buf);
+ 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);
@@ -1191,7 +1255,7 @@ static void am_run(struct am_state *state)
strbuf_release(&sb);
while (state->cur <= state->last) {
- const char *patch, *msg;
+ const char *patch;
int apply_status, skip;
patch = am_path(state, msgnum(state));
@@ -1208,10 +1272,10 @@ static void am_run(struct am_state *state)
goto next; /* patch should be skipped */
write_author_script(state);
- write_file(am_path(state, "final-commit"), 1, "%s", state->msg.buf);
+ write_file(am_path(state, "final-commit"), 1, "%s", state->msg);
- msg = state->msg.buf;
- say(state, stdout, _("Applying: %.*s"), linelen(msg), msg);
+ say(state, stdout, _("Applying: %.*s"), linelen(state->msg),
+ state->msg);
apply_status = run_apply(state, NULL);
@@ -1235,9 +1299,8 @@ static void am_run(struct am_state *state)
if (apply_status) {
int advice_amworkdir = 1;
- msg = state->msg.buf;
printf_ln(_("Patch failed at %s %.*s"), msgnum(state),
- linelen(msg), msg);
+ linelen(state->msg), state->msg);
git_config_get_bool("advice.amworkdir", &advice_amworkdir);
@@ -1267,10 +1330,7 @@ next:
*/
static void am_resolve(struct am_state *state)
{
- const char *msg;
-
- msg = state->msg.buf;
- say(state, stdout, _("Applying: %.*s"), linelen(msg), 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"
next prev parent reply other threads:[~2015-06-24 7:55 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-18 11:25 [PATCH/WIP v3 00/31] Make git-am a builtin Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 01/31] wrapper: implement xopen() Paul Tan
2015-06-24 16:28 ` Johannes Schindelin
2015-06-24 16:59 ` Stefan Beller
2015-06-24 18:39 ` Johannes Schindelin
2015-07-01 9:41 ` Paul Tan
2015-07-01 9:53 ` Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 02/31] wrapper: implement xfopen() Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 03/31] am: implement skeletal builtin am Paul Tan
2015-06-18 20:26 ` Junio C Hamano
2015-06-19 9:56 ` Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 04/31] am: implement patch queue mechanism Paul Tan
2015-06-18 17:47 ` Stefan Beller
2015-06-18 20:43 ` Junio C Hamano
2015-06-19 12:49 ` Paul Tan
2015-06-24 14:59 ` Johannes Schindelin
2015-06-25 15:16 ` Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 05/31] am: split out mbox/maildir patches with git-mailsplit Paul Tan
2015-06-18 20:52 ` Junio C Hamano
2015-06-18 11:25 ` [PATCH/WIP v3 06/31] am: detect mbox patches Paul Tan
2015-06-18 21:02 ` Junio C Hamano
2015-06-24 8:41 ` Paul Tan
2015-06-24 15:10 ` Johannes Schindelin
2015-06-25 13:40 ` Paul Tan
2015-06-26 7:42 ` Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 07/31] am: extract patch, message and authorship with git-mailinfo Paul Tan
2015-06-18 21:10 ` Junio C Hamano
2015-06-19 9:22 ` Paul Tan
2015-06-19 16:13 ` Junio C Hamano
2015-06-24 7:54 ` Paul Tan [this message]
2015-06-24 15:59 ` Junio C Hamano
2015-06-25 11:54 ` Paul Tan
[not found] ` <CAPc5daVbpB_T4cY1xvLrBKPUZw0JNMXqNAOsKE-R7NPO2nrnZA@mail.gmail.com>
2015-06-19 16:15 ` Paul Tan
2015-06-19 20:12 ` Johannes Schindelin
2015-06-24 16:36 ` Johannes Schindelin
2015-06-26 8:11 ` Paul Tan
2015-06-26 20:41 ` Junio C Hamano
2015-06-18 11:25 ` [PATCH/WIP v3 08/31] am: apply patch with git-apply Paul Tan
2015-06-18 21:23 ` Junio C Hamano
2015-06-18 11:25 ` [PATCH/WIP v3 09/31] am: commit applied patch Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 10/31] am: refresh the index at start Paul Tan
2015-06-18 21:28 ` Junio C Hamano
2015-06-19 8:07 ` Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 11/31] am: refuse to apply patches if index is dirty Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 12/31] am: implement --resolved/--continue Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 13/31] am: implement --skip Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 14/31] am: implement --abort Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 15/31] am: don't accept patches when there's a session in progress Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 16/31] am: implement quiet option Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 17/31] am: exit with user friendly message on patch failure Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 18/31] am: implement am --signoff Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 19/31] cache-tree: introduce write_index_as_tree() Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 20/31] am: implement 3-way merge Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 21/31] am: --rebasing Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 22/31] am: don't use git-mailinfo if --rebasing Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 23/31] am: handle stray state directory Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 24/31] am: implement -k/--keep, --keep-non-patch Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 25/31] am: implement --[no-]message-id, am.messageid Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 26/31] am: support --keep-cr, am.keepcr Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 27/31] am: implement --[no-]scissors Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 28/31] am: pass git-apply's options to git-apply Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 29/31] am: implement --ignore-date Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 30/31] am: implement --committer-date-is-author-date Paul Tan
2015-06-18 11:25 ` [PATCH/WIP v3 31/31] am: implement -S/--gpg-sign, commit.gpgsign Paul Tan
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