* [PATCH v9 01/14] convert: quote filter names in error messages
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 02/14] convert: modernize tests larsxschneider
` (13 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
Git filter driver commands with spaces (e.g. `filter.sh foo`) are hard
to read in error messages. Quote them to improve the readability.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
convert.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/convert.c b/convert.c
index 077f5e6..986c239 100644
--- a/convert.c
+++ b/convert.c
@@ -412,7 +412,7 @@ static int filter_buffer_or_fd(int in, int out, void *data)
child_process.out = out;
if (start_command(&child_process))
- return error("cannot fork to run external filter %s", params->cmd);
+ return error("cannot fork to run external filter '%s'", params->cmd);
sigchain_push(SIGPIPE, SIG_IGN);
@@ -430,13 +430,13 @@ static int filter_buffer_or_fd(int in, int out, void *data)
if (close(child_process.in))
write_err = 1;
if (write_err)
- error("cannot feed the input to external filter %s", params->cmd);
+ error("cannot feed the input to external filter '%s'", params->cmd);
sigchain_pop(SIGPIPE);
status = finish_command(&child_process);
if (status)
- error("external filter %s failed %d", params->cmd, status);
+ error("external filter '%s' failed %d", params->cmd, status);
strbuf_release(&cmd);
return (write_err || status);
@@ -477,15 +477,15 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
return 0; /* error was already reported */
if (strbuf_read(&nbuf, async.out, len) < 0) {
- error("read from external filter %s failed", cmd);
+ error("read from external filter '%s' failed", cmd);
ret = 0;
}
if (close(async.out)) {
- error("read from external filter %s failed", cmd);
+ error("read from external filter '%s' failed", cmd);
ret = 0;
}
if (finish_async(&async)) {
- error("external filter %s failed", cmd);
+ error("external filter '%s' failed", cmd);
ret = 0;
}
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 02/14] convert: modernize tests
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
2016-10-04 12:59 ` [PATCH v9 01/14] convert: quote filter names in error messages larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 03/14] run-command: move check_pipe() from write_or_die to run_command larsxschneider
` (12 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
Use `test_config` to set the config, check that files are empty with
`test_must_be_empty`, compare files with `test_cmp`, and remove spaces
after ">" and "<".
Please note that the "rot13" filter configured in "setup" keeps using
`git config` instead of `test_config` because subsequent tests might
depend on it.
Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
t/t0021-conversion.sh | 58 +++++++++++++++++++++++++--------------------------
1 file changed, 29 insertions(+), 29 deletions(-)
diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index e799e59..dc50938 100755
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -38,8 +38,8 @@ script='s/^\$Id: \([0-9a-f]*\) \$/\1/p'
test_expect_success check '
- cmp test.o test &&
- cmp test.o test.t &&
+ test_cmp test.o test &&
+ test_cmp test.o test.t &&
# ident should be stripped in the repository
git diff --raw --exit-code :test :test.i &&
@@ -47,10 +47,10 @@ test_expect_success check '
embedded=$(sed -ne "$script" test.i) &&
test "z$id" = "z$embedded" &&
- git cat-file blob :test.t > test.r &&
+ git cat-file blob :test.t >test.r &&
- ./rot13.sh < test.o > test.t &&
- cmp test.r test.t
+ ./rot13.sh <test.o >test.t &&
+ test_cmp test.r test.t
'
# If an expanded ident ever gets into the repository, we want to make sure that
@@ -130,7 +130,7 @@ test_expect_success 'filter shell-escaped filenames' '
# delete the files and check them out again, using a smudge filter
# that will count the args and echo the command-line back to us
- git config filter.argc.smudge "sh ./argc.sh %f" &&
+ test_config filter.argc.smudge "sh ./argc.sh %f" &&
rm "$normal" "$special" &&
git checkout -- "$normal" "$special" &&
@@ -141,7 +141,7 @@ test_expect_success 'filter shell-escaped filenames' '
test_cmp expect "$special" &&
# do the same thing, but with more args in the filter expression
- git config filter.argc.smudge "sh ./argc.sh %f --my-extra-arg" &&
+ test_config filter.argc.smudge "sh ./argc.sh %f --my-extra-arg" &&
rm "$normal" "$special" &&
git checkout -- "$normal" "$special" &&
@@ -154,9 +154,9 @@ test_expect_success 'filter shell-escaped filenames' '
'
test_expect_success 'required filter should filter data' '
- git config filter.required.smudge ./rot13.sh &&
- git config filter.required.clean ./rot13.sh &&
- git config filter.required.required true &&
+ test_config filter.required.smudge ./rot13.sh &&
+ test_config filter.required.clean ./rot13.sh &&
+ test_config filter.required.required true &&
echo "*.r filter=required" >.gitattributes &&
@@ -165,17 +165,17 @@ test_expect_success 'required filter should filter data' '
rm -f test.r &&
git checkout -- test.r &&
- cmp test.o test.r &&
+ test_cmp test.o test.r &&
./rot13.sh <test.o >expected &&
git cat-file blob :test.r >actual &&
- cmp expected actual
+ test_cmp expected actual
'
test_expect_success 'required filter smudge failure' '
- git config filter.failsmudge.smudge false &&
- git config filter.failsmudge.clean cat &&
- git config filter.failsmudge.required true &&
+ test_config filter.failsmudge.smudge false &&
+ test_config filter.failsmudge.clean cat &&
+ test_config filter.failsmudge.required true &&
echo "*.fs filter=failsmudge" >.gitattributes &&
@@ -186,9 +186,9 @@ test_expect_success 'required filter smudge failure' '
'
test_expect_success 'required filter clean failure' '
- git config filter.failclean.smudge cat &&
- git config filter.failclean.clean false &&
- git config filter.failclean.required true &&
+ test_config filter.failclean.smudge cat &&
+ test_config filter.failclean.clean false &&
+ test_config filter.failclean.required true &&
echo "*.fc filter=failclean" >.gitattributes &&
@@ -197,8 +197,8 @@ test_expect_success 'required filter clean failure' '
'
test_expect_success 'filtering large input to small output should use little memory' '
- git config filter.devnull.clean "cat >/dev/null" &&
- git config filter.devnull.required true &&
+ test_config filter.devnull.clean "cat >/dev/null" &&
+ test_config filter.devnull.required true &&
for i in $(test_seq 1 30); do printf "%1048576d" 1; done >30MB &&
echo "30MB filter=devnull" >.gitattributes &&
GIT_MMAP_LIMIT=1m GIT_ALLOC_LIMIT=1m git add 30MB
@@ -207,7 +207,7 @@ test_expect_success 'filtering large input to small output should use little mem
test_expect_success 'filter that does not read is fine' '
test-genrandom foo $((128 * 1024 + 1)) >big &&
echo "big filter=epipe" >.gitattributes &&
- git config filter.epipe.clean "echo xyzzy" &&
+ test_config filter.epipe.clean "echo xyzzy" &&
git add big &&
git cat-file blob :big >actual &&
echo xyzzy >expect &&
@@ -215,20 +215,20 @@ test_expect_success 'filter that does not read is fine' '
'
test_expect_success EXPENSIVE 'filter large file' '
- git config filter.largefile.smudge cat &&
- git config filter.largefile.clean cat &&
+ test_config filter.largefile.smudge cat &&
+ test_config filter.largefile.clean cat &&
for i in $(test_seq 1 2048); do printf "%1048576d" 1; done >2GB &&
echo "2GB filter=largefile" >.gitattributes &&
git add 2GB 2>err &&
- ! test -s err &&
+ test_must_be_empty err &&
rm -f 2GB &&
git checkout -- 2GB 2>err &&
- ! test -s err
+ test_must_be_empty err
'
test_expect_success "filter: clean empty file" '
- git config filter.in-repo-header.clean "echo cleaned && cat" &&
- git config filter.in-repo-header.smudge "sed 1d" &&
+ test_config filter.in-repo-header.clean "echo cleaned && cat" &&
+ test_config filter.in-repo-header.smudge "sed 1d" &&
echo "empty-in-worktree filter=in-repo-header" >>.gitattributes &&
>empty-in-worktree &&
@@ -240,8 +240,8 @@ test_expect_success "filter: clean empty file" '
'
test_expect_success "filter: smudge empty file" '
- git config filter.empty-in-repo.clean "cat >/dev/null" &&
- git config filter.empty-in-repo.smudge "echo smudged && cat" &&
+ test_config filter.empty-in-repo.clean "cat >/dev/null" &&
+ test_config filter.empty-in-repo.smudge "echo smudged && cat" &&
echo "empty-in-repo filter=empty-in-repo" >>.gitattributes &&
echo dead data walking >empty-in-repo &&
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 03/14] run-command: move check_pipe() from write_or_die to run_command
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
2016-10-04 12:59 ` [PATCH v9 01/14] convert: quote filter names in error messages larsxschneider
2016-10-04 12:59 ` [PATCH v9 02/14] convert: modernize tests larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 04/14] run-command: add wait_on_exit larsxschneider
` (11 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
Move check_pipe() to run_command and make it public. This is necessary
to call the function from pkt-line in a subsequent patch.
While at it, make async_exit() static to run_command.c as it is no
longer used from outside.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
run-command.c | 17 +++++++++++++++--
run-command.h | 2 +-
write_or_die.c | 13 -------------
3 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/run-command.c b/run-command.c
index 5a4dbb6..3269362 100644
--- a/run-command.c
+++ b/run-command.c
@@ -634,7 +634,7 @@ int in_async(void)
return !pthread_equal(main_thread, pthread_self());
}
-void NORETURN async_exit(int code)
+static void NORETURN async_exit(int code)
{
pthread_exit((void *)(intptr_t)code);
}
@@ -684,13 +684,26 @@ int in_async(void)
return process_is_async;
}
-void NORETURN async_exit(int code)
+static void NORETURN async_exit(int code)
{
exit(code);
}
#endif
+void check_pipe(int err)
+{
+ if (err == EPIPE) {
+ if (in_async())
+ async_exit(141);
+
+ signal(SIGPIPE, SIG_DFL);
+ raise(SIGPIPE);
+ /* Should never happen, but just in case... */
+ exit(141);
+ }
+}
+
int start_async(struct async *async)
{
int need_in, need_out;
diff --git a/run-command.h b/run-command.h
index 5066649..cf29a31 100644
--- a/run-command.h
+++ b/run-command.h
@@ -139,7 +139,7 @@ struct async {
int start_async(struct async *async);
int finish_async(struct async *async);
int in_async(void);
-void NORETURN async_exit(int code);
+void check_pipe(int err);
/**
* This callback should initialize the child process and preload the
diff --git a/write_or_die.c b/write_or_die.c
index 0734432..eab8c8d 100644
--- a/write_or_die.c
+++ b/write_or_die.c
@@ -1,19 +1,6 @@
#include "cache.h"
#include "run-command.h"
-static void check_pipe(int err)
-{
- if (err == EPIPE) {
- if (in_async())
- async_exit(141);
-
- signal(SIGPIPE, SIG_DFL);
- raise(SIGPIPE);
- /* Should never happen, but just in case... */
- exit(141);
- }
-}
-
/*
* Some cases use stdio, but want to flush after the write
* to get error handling (and to get better interactive
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 04/14] run-command: add wait_on_exit
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (2 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 03/14] run-command: move check_pipe() from write_or_die to run_command larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 19:30 ` Junio C Hamano
2016-10-04 12:59 ` [PATCH v9 05/14] pkt-line: rename packet_write() to packet_write_fmt() larsxschneider
` (10 subsequent siblings)
14 siblings, 1 reply; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
The flag 'clean_on_exit' kills child processes spawned by Git on exit.
A hard kill like this might not be desired in all cases.
Add 'wait_on_exit' which closes the child's stdin on Git exit and waits
until the child process has terminated.
The flag is used in a subsequent patch.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
---
run-command.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++--------
run-command.h | 3 +++
2 files changed, 50 insertions(+), 8 deletions(-)
diff --git a/run-command.c b/run-command.c
index 3269362..96c54fe 100644
--- a/run-command.c
+++ b/run-command.c
@@ -21,6 +21,9 @@ void child_process_clear(struct child_process *child)
struct child_to_clean {
pid_t pid;
+ char *name;
+ int stdin;
+ int wait;
struct child_to_clean *next;
};
static struct child_to_clean *children_to_clean;
@@ -28,12 +31,33 @@ static int installed_child_cleanup_handler;
static void cleanup_children(int sig, int in_signal)
{
+ int status;
+ struct child_to_clean *p = children_to_clean;
+
+ /* Close the the child's stdin as indicator that Git will exit soon */
+ while (p) {
+ if (p->wait)
+ if (p->stdin > 0)
+ close(p->stdin);
+ p = p->next;
+ }
+
while (children_to_clean) {
- struct child_to_clean *p = children_to_clean;
+ p = children_to_clean;
children_to_clean = p->next;
+
+ if (p->wait) {
+ fprintf(stderr, _("Waiting for '%s' to finish..."), p->name);
+ while ((waitpid(p->pid, &status, 0)) < 0 && errno == EINTR)
+ ; /* nothing */
+ fprintf(stderr, _("done!\n"));
+ }
+
kill(p->pid, sig);
- if (!in_signal)
+ if (!in_signal) {
+ free(p->name);
free(p);
+ }
}
}
@@ -49,10 +73,16 @@ static void cleanup_children_on_exit(void)
cleanup_children(SIGTERM, 0);
}
-static void mark_child_for_cleanup(pid_t pid)
+static void mark_child_for_cleanup(pid_t pid, const char *name, int stdin, int wait)
{
struct child_to_clean *p = xmalloc(sizeof(*p));
p->pid = pid;
+ p->wait = wait;
+ p->stdin = stdin;
+ if (name)
+ p->name = xstrdup(name);
+ else
+ p->name = "process";
p->next = children_to_clean;
children_to_clean = p;
@@ -63,6 +93,13 @@ static void mark_child_for_cleanup(pid_t pid)
}
}
+#ifdef NO_PTHREADS
+static void mark_child_for_cleanup_no_wait(pid_t pid, const char *name, int timeout, int stdin)
+{
+ mark_child_for_cleanup(pid, NULL, 0, 0);
+}
+#endif
+
static void clear_child_for_cleanup(pid_t pid)
{
struct child_to_clean **pp;
@@ -421,8 +458,9 @@ int start_command(struct child_process *cmd)
}
if (cmd->pid < 0)
error_errno("cannot fork() for %s", cmd->argv[0]);
- else if (cmd->clean_on_exit)
- mark_child_for_cleanup(cmd->pid);
+ else if (cmd->clean_on_exit || cmd->wait_on_exit)
+ mark_child_for_cleanup(
+ cmd->pid, cmd->argv[0], cmd->in, cmd->wait_on_exit);
/*
* Wait for child's execvp. If the execvp succeeds (or if fork()
@@ -482,8 +520,9 @@ int start_command(struct child_process *cmd)
failed_errno = errno;
if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
error_errno("cannot spawn %s", cmd->argv[0]);
- if (cmd->clean_on_exit && cmd->pid >= 0)
- mark_child_for_cleanup(cmd->pid);
+ if ((cmd->clean_on_exit || cmd->wait_on_exit) && cmd->pid >= 0)
+ mark_child_for_cleanup(
+ cmd->pid, cmd->argv[0], cmd->in, cmd->clean_on_exit_timeout);
argv_array_clear(&nargv);
cmd->argv = sargv;
@@ -765,7 +804,7 @@ int start_async(struct async *async)
exit(!!async->proc(proc_in, proc_out, async->data));
}
- mark_child_for_cleanup(async->pid);
+ mark_child_for_cleanup_no_wait(async->pid);
if (need_in)
close(fdin[0]);
diff --git a/run-command.h b/run-command.h
index cf29a31..f7b9907 100644
--- a/run-command.h
+++ b/run-command.h
@@ -42,7 +42,10 @@ struct child_process {
unsigned silent_exec_failure:1;
unsigned stdout_to_stderr:1;
unsigned use_shell:1;
+ /* kill the child on Git exit */
unsigned clean_on_exit:1;
+ /* close the child's stdin on Git exit and wait until it terminates */
+ unsigned wait_on_exit:1;
};
#define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT }
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v9 04/14] run-command: add wait_on_exit
2016-10-04 12:59 ` [PATCH v9 04/14] run-command: add wait_on_exit larsxschneider
@ 2016-10-04 19:30 ` Junio C Hamano
2016-10-05 20:57 ` Lars Schneider
0 siblings, 1 reply; 28+ messages in thread
From: Junio C Hamano @ 2016-10-04 19:30 UTC (permalink / raw)
To: larsxschneider; +Cc: git, ramsay, jnareb, j6t, tboegi, peff, mlbright
larsxschneider@gmail.com writes:
> From: Lars Schneider <larsxschneider@gmail.com>
>
> The flag 'clean_on_exit' kills child processes spawned by Git on exit.
> A hard kill like this might not be desired in all cases.
>
> Add 'wait_on_exit' which closes the child's stdin on Git exit and waits
> until the child process has terminated.
>
> The flag is used in a subsequent patch.
>
> Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
> ---
> run-command.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++--------
> run-command.h | 3 +++
> 2 files changed, 50 insertions(+), 8 deletions(-)
>
> diff --git a/run-command.c b/run-command.c
> index 3269362..96c54fe 100644
> --- a/run-command.c
> +++ b/run-command.c
> @@ -21,6 +21,9 @@ void child_process_clear(struct child_process *child)
>
> struct child_to_clean {
> pid_t pid;
> + char *name;
> + int stdin;
> + int wait;
> struct child_to_clean *next;
> };
> static struct child_to_clean *children_to_clean;
> @@ -28,12 +31,33 @@ static int installed_child_cleanup_handler;
>
> static void cleanup_children(int sig, int in_signal)
> {
> + int status;
> + struct child_to_clean *p = children_to_clean;
> +
> + /* Close the the child's stdin as indicator that Git will exit soon */
> + while (p) {
> + if (p->wait)
> + if (p->stdin > 0)
> + close(p->stdin);
> + p = p->next;
> + }
This part and the "stdin" field feels a bit too specific to the
caller you are adding. Allowing the user of the API to specify what
clean-up cation needs to be taken in the form of a callback function
may not be that much more effort and would be more flexible and
useful, I would imagine?
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v9 04/14] run-command: add wait_on_exit
2016-10-04 19:30 ` Junio C Hamano
@ 2016-10-05 20:57 ` Lars Schneider
2016-10-05 21:12 ` Junio C Hamano
0 siblings, 1 reply; 28+ messages in thread
From: Lars Schneider @ 2016-10-05 20:57 UTC (permalink / raw)
To: Junio C Hamano; +Cc: git, ramsay, jnareb, j6t, tboegi, peff, mlbright
> On 04 Oct 2016, at 21:30, Junio C Hamano <gitster@pobox.com> wrote:
>
> larsxschneider@gmail.com writes:
>
>> From: Lars Schneider <larsxschneider@gmail.com>
>>
>> The flag 'clean_on_exit' kills child processes spawned by Git on exit.
>> A hard kill like this might not be desired in all cases.
>>
>> Add 'wait_on_exit' which closes the child's stdin on Git exit and waits
>> until the child process has terminated.
>>
>> The flag is used in a subsequent patch.
>>
>> Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
>> ---
>> ...
>> static void cleanup_children(int sig, int in_signal)
>> {
>> + int status;
>> + struct child_to_clean *p = children_to_clean;
>> +
>> + /* Close the the child's stdin as indicator that Git will exit soon */
>> + while (p) {
>> + if (p->wait)
>> + if (p->stdin > 0)
>> + close(p->stdin);
>> + p = p->next;
>> + }
>
> This part and the "stdin" field feels a bit too specific to the
> caller you are adding. Allowing the user of the API to specify what
> clean-up cation needs to be taken in the form of a callback function
> may not be that much more effort and would be more flexible and
> useful, I would imagine?
OK. Something like the patch below would work nicely.
Does this look acceptable?
Thanks,
Lars
diff --git a/run-command.c b/run-command.c
index 3269362..a0256a6 100644
--- a/run-command.c
+++ b/run-command.c
@@ -21,6 +21,7 @@ void child_process_clear(struct child_process *child)
struct child_to_clean {
pid_t pid;
+ void (*clean_on_exit_handler)(pid_t, int);
struct child_to_clean *next;
};
static struct child_to_clean *children_to_clean;
@@ -31,6 +32,11 @@ static void cleanup_children(int sig, int in_signal)
while (children_to_clean) {
struct child_to_clean *p = children_to_clean;
children_to_clean = p->next;
+
+ if (p->clean_on_exit_handler) {
+ p->clean_on_exit_handler(p->pid, in_signal);
+ }
+
kill(p->pid, sig);
if (!in_signal)
free(p);
@@ -49,10 +55,11 @@ static void cleanup_children_on_exit(void)
cleanup_children(SIGTERM, 0);
}
-static void mark_child_for_cleanup(pid_t pid)
+static void mark_child_for_cleanup(pid_t pid, void (*clean_on_exit_handler)(pid_t, int))
{
struct child_to_clean *p = xmalloc(sizeof(*p));
p->pid = pid;
+ p->clean_on_exit_handler = clean_on_exit_handler;
p->next = children_to_clean;
children_to_clean = p;
@@ -421,8 +428,8 @@ int start_command(struct child_process *cmd)
}
if (cmd->pid < 0)
error_errno("cannot fork() for %s", cmd->argv[0]);
- else if (cmd->clean_on_exit)
- mark_child_for_cleanup(cmd->pid);
+ else if (cmd->clean_on_exit || cmd->clean_on_exit_handler)
+ mark_child_for_cleanup(cmd->pid, cmd->clean_on_exit_handler);
/*
* Wait for child's execvp. If the execvp succeeds (or if fork()
@@ -482,8 +489,8 @@ int start_command(struct child_process *cmd)
failed_errno = errno;
if (cmd->pid < 0 && (!cmd->silent_exec_failure || errno != ENOENT))
error_errno("cannot spawn %s", cmd->argv[0]);
- if (cmd->clean_on_exit && cmd->pid >= 0)
- mark_child_for_cleanup(cmd->pid);
+ if ((cmd->clean_on_exit || cmd->clean_on_exit_handler) && cmd->pid >= 0)
+ mark_child_for_cleanup(cmd->pid, cmd->clean_on_exit_handler);
argv_array_clear(&nargv);
cmd->argv = sargv;
@@ -765,7 +772,7 @@ int start_async(struct async *async)
exit(!!async->proc(proc_in, proc_out, async->data));
}
- mark_child_for_cleanup(async->pid);
+ mark_child_for_cleanup(async->pid, NULL);
if (need_in)
close(fdin[0]);
diff --git a/run-command.h b/run-command.h
index cf29a31..3630733 100644
--- a/run-command.h
+++ b/run-command.h
@@ -43,6 +43,7 @@ struct child_process {
unsigned stdout_to_stderr:1;
unsigned use_shell:1;
unsigned clean_on_exit:1;
+ void (*clean_on_exit_handler)(pid_t, int);
};
#define CHILD_PROCESS_INIT { NULL, ARGV_ARRAY_INIT, ARGV_ARRAY_INIT }
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v9 04/14] run-command: add wait_on_exit
2016-10-05 20:57 ` Lars Schneider
@ 2016-10-05 21:12 ` Junio C Hamano
2016-10-06 9:32 ` Johannes Schindelin
0 siblings, 1 reply; 28+ messages in thread
From: Junio C Hamano @ 2016-10-05 21:12 UTC (permalink / raw)
To: Lars Schneider; +Cc: git, ramsay, jnareb, j6t, tboegi, peff, mlbright
Lars Schneider <larsxschneider@gmail.com> writes:
> OK. Something like the patch below would work nicely.
Yeah, something along that line; it would eliminate the need to
worry about a field named "stdin" ;-)
But ...
> while (children_to_clean) {
> struct child_to_clean *p = children_to_clean;
> children_to_clean = p->next;
> +
> + if (p->clean_on_exit_handler) {
> + p->clean_on_exit_handler(p->pid, in_signal);
> + }
... the application that used run_command() API would want to be
able to pass extra piece of data that is appliation-specific for the
child being killed, so it may make sense to extend the function
signature to take a pointer to "struct child_process" for the child
process being killed, together with a new field added to "struct
child_process" that is "void *exit_handler_cbdata;", perhaps?
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v9 04/14] run-command: add wait_on_exit
2016-10-05 21:12 ` Junio C Hamano
@ 2016-10-06 9:32 ` Johannes Schindelin
2016-10-06 9:35 ` Lars Schneider
2016-10-06 15:53 ` Junio C Hamano
0 siblings, 2 replies; 28+ messages in thread
From: Johannes Schindelin @ 2016-10-06 9:32 UTC (permalink / raw)
To: Junio C Hamano
Cc: Lars Schneider, git, ramsay, jnareb, j6t, tboegi, peff, mlbright
Hi Junio & Lars,
On Wed, 5 Oct 2016, Junio C Hamano wrote:
> Lars Schneider <larsxschneider@gmail.com> writes:
>
> > OK. Something like the patch below would work nicely.
>
> Yeah, something along that line; it would eliminate the need to
> worry about a field named "stdin" ;-)
Not only a need to worry. Git for Windows' SDK's headers define
#define stdin (&__iob_func()[0])
leading to the compile error
In file included from git-compat-util.h:159:0,
from cache.h:4,
from run-command.c:1:
run-command.c:25:6: error: expected identifier or '(' before '&' token
int stdin;
^
I meant to investigate this build failure of `pu` earlier but only got
around to do it today.
Ciao,
Dscho
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v9 04/14] run-command: add wait_on_exit
2016-10-06 9:32 ` Johannes Schindelin
@ 2016-10-06 9:35 ` Lars Schneider
2016-10-06 15:53 ` Junio C Hamano
1 sibling, 0 replies; 28+ messages in thread
From: Lars Schneider @ 2016-10-06 9:35 UTC (permalink / raw)
To: Johannes Schindelin, Ramsay Jones, Torsten Bögershausen
Cc: Junio C Hamano, git
> On 06 Oct 2016, at 11:32, Johannes Schindelin <johannes.schindelin@gmx.de> wrote:
>
> Hi Junio & Lars,
>
> On Wed, 5 Oct 2016, Junio C Hamano wrote:
>
>> Lars Schneider <larsxschneider@gmail.com> writes:
>>
>>> OK. Something like the patch below would work nicely.
>>
>> Yeah, something along that line; it would eliminate the need to
>> worry about a field named "stdin" ;-)
>
> Not only a need to worry. Git for Windows' SDK's headers define
>
> #define stdin (&__iob_func()[0])
>
> leading to the compile error
>
> In file included from git-compat-util.h:159:0,
> from cache.h:4,
> from run-command.c:1:
> run-command.c:25:6: error: expected identifier or '(' before '&' token
> int stdin;
> ^
>
> I meant to investigate this build failure of `pu` earlier but only got
> around to do it today.
>
> Ciao,
> Dscho
Sorry for the trouble. The "stdin" will go away in the next round
as we agreed on a more generic solution:
http://public-inbox.org/git/1FD7FB64-0F40-47F0-A047-25B91B170E66@gmail.com/
- Lars
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v9 04/14] run-command: add wait_on_exit
2016-10-06 9:32 ` Johannes Schindelin
2016-10-06 9:35 ` Lars Schneider
@ 2016-10-06 15:53 ` Junio C Hamano
1 sibling, 0 replies; 28+ messages in thread
From: Junio C Hamano @ 2016-10-06 15:53 UTC (permalink / raw)
To: Johannes Schindelin
Cc: Lars Schneider, git, ramsay, jnareb, j6t, tboegi, peff, mlbright
Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:
> Hi Junio & Lars,
>
> On Wed, 5 Oct 2016, Junio C Hamano wrote:
>
>> Lars Schneider <larsxschneider@gmail.com> writes:
>>
>> > OK. Something like the patch below would work nicely.
>>
>> Yeah, something along that line; it would eliminate the need to
>> worry about a field named "stdin" ;-)
>
> Not only a need to worry....
Thanks, but I (and more importantly Lars, too) knew that stdin is
problematic when I sent the message you are responding to, as raised
by Ramsay in a separate thread:
<f9b6abf6-8305-4a32-29af-765f08fee94b@ramsayjones.plus.com>
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v9 05/14] pkt-line: rename packet_write() to packet_write_fmt()
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (3 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 04/14] run-command: add wait_on_exit larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 06/14] pkt-line: extract set_packet_header() larsxschneider
` (9 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
packet_write() should be called packet_write_fmt() because it is a
printf-like function that takes a format string as first parameter.
packet_write_fmt() should be used for text strings only. Arbitrary
binary data should use a new packet_write() function that is introduced
in a subsequent patch.
Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
builtin/archive.c | 4 ++--
builtin/receive-pack.c | 4 ++--
builtin/remote-ext.c | 4 ++--
builtin/upload-archive.c | 4 ++--
connect.c | 2 +-
daemon.c | 2 +-
http-backend.c | 2 +-
pkt-line.c | 2 +-
pkt-line.h | 2 +-
shallow.c | 2 +-
upload-pack.c | 30 +++++++++++++++---------------
11 files changed, 29 insertions(+), 29 deletions(-)
diff --git a/builtin/archive.c b/builtin/archive.c
index a1e3b94..49f4914 100644
--- a/builtin/archive.c
+++ b/builtin/archive.c
@@ -47,10 +47,10 @@ static int run_remote_archiver(int argc, const char **argv,
if (name_hint) {
const char *format = archive_format_from_filename(name_hint);
if (format)
- packet_write(fd[1], "argument --format=%s\n", format);
+ packet_write_fmt(fd[1], "argument --format=%s\n", format);
}
for (i = 1; i < argc; i++)
- packet_write(fd[1], "argument %s\n", argv[i]);
+ packet_write_fmt(fd[1], "argument %s\n", argv[i]);
packet_flush(fd[1]);
buf = packet_read_line(fd[0], NULL);
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 011db00..1ce7682 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -218,7 +218,7 @@ static int receive_pack_config(const char *var, const char *value, void *cb)
static void show_ref(const char *path, const unsigned char *sha1)
{
if (sent_capabilities) {
- packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
+ packet_write_fmt(1, "%s %s\n", sha1_to_hex(sha1), path);
} else {
struct strbuf cap = STRBUF_INIT;
@@ -233,7 +233,7 @@ static void show_ref(const char *path, const unsigned char *sha1)
if (advertise_push_options)
strbuf_addstr(&cap, " push-options");
strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
- packet_write(1, "%s %s%c%s\n",
+ packet_write_fmt(1, "%s %s%c%s\n",
sha1_to_hex(sha1), path, 0, cap.buf);
strbuf_release(&cap);
sent_capabilities = 1;
diff --git a/builtin/remote-ext.c b/builtin/remote-ext.c
index 88eb8f9..11b48bf 100644
--- a/builtin/remote-ext.c
+++ b/builtin/remote-ext.c
@@ -128,9 +128,9 @@ static void send_git_request(int stdin_fd, const char *serv, const char *repo,
const char *vhost)
{
if (!vhost)
- packet_write(stdin_fd, "%s %s%c", serv, repo, 0);
+ packet_write_fmt(stdin_fd, "%s %s%c", serv, repo, 0);
else
- packet_write(stdin_fd, "%s %s%chost=%s%c", serv, repo, 0,
+ packet_write_fmt(stdin_fd, "%s %s%chost=%s%c", serv, repo, 0,
vhost, 0);
}
diff --git a/builtin/upload-archive.c b/builtin/upload-archive.c
index 2caedf1..dc872f6 100644
--- a/builtin/upload-archive.c
+++ b/builtin/upload-archive.c
@@ -88,11 +88,11 @@ int cmd_upload_archive(int argc, const char **argv, const char *prefix)
writer.git_cmd = 1;
if (start_command(&writer)) {
int err = errno;
- packet_write(1, "NACK unable to spawn subprocess\n");
+ packet_write_fmt(1, "NACK unable to spawn subprocess\n");
die("upload-archive: %s", strerror(err));
}
- packet_write(1, "ACK\n");
+ packet_write_fmt(1, "ACK\n");
packet_flush(1);
while (1) {
diff --git a/connect.c b/connect.c
index 722dc3f..5330d9c 100644
--- a/connect.c
+++ b/connect.c
@@ -730,7 +730,7 @@ struct child_process *git_connect(int fd[2], const char *url,
* Note: Do not add any other headers here! Doing so
* will cause older git-daemon servers to crash.
*/
- packet_write(fd[1],
+ packet_write_fmt(fd[1],
"%s %s%chost=%s%c",
prog, path, 0,
target_host, 0);
diff --git a/daemon.c b/daemon.c
index 425aad0..afce1b9 100644
--- a/daemon.c
+++ b/daemon.c
@@ -281,7 +281,7 @@ static int daemon_error(const char *dir, const char *msg)
{
if (!informative_errors)
msg = "access denied or repository not exported";
- packet_write(1, "ERR %s: %s", msg, dir);
+ packet_write_fmt(1, "ERR %s: %s", msg, dir);
return -1;
}
diff --git a/http-backend.c b/http-backend.c
index adc8c8c..eef0a36 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -464,7 +464,7 @@ static void get_info_refs(struct strbuf *hdr, char *arg)
hdr_str(hdr, content_type, buf.buf);
end_headers(hdr);
- packet_write(1, "# service=git-%s\n", svc->name);
+ packet_write_fmt(1, "# service=git-%s\n", svc->name);
packet_flush(1);
argv[0] = svc->name;
diff --git a/pkt-line.c b/pkt-line.c
index 62fdb37..0a9b61c 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -118,7 +118,7 @@ static void format_packet(struct strbuf *out, const char *fmt, va_list args)
packet_trace(out->buf + orig_len + 4, n - 4, 1);
}
-void packet_write(int fd, const char *fmt, ...)
+void packet_write_fmt(int fd, const char *fmt, ...)
{
static struct strbuf buf = STRBUF_INIT;
va_list args;
diff --git a/pkt-line.h b/pkt-line.h
index 3cb9d91..1902fb3 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -20,7 +20,7 @@
* side can't, we stay with pure read/write interfaces.
*/
void packet_flush(int fd);
-void packet_write(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
+void packet_write_fmt(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
void packet_buf_flush(struct strbuf *buf);
void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
diff --git a/shallow.c b/shallow.c
index 54e2db7..d666e24 100644
--- a/shallow.c
+++ b/shallow.c
@@ -260,7 +260,7 @@ static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *c
{
int fd = *(int *)cb;
if (graft->nr_parent == -1)
- packet_write(fd, "shallow %s\n", oid_to_hex(&graft->oid));
+ packet_write_fmt(fd, "shallow %s\n", oid_to_hex(&graft->oid));
return 0;
}
diff --git a/upload-pack.c b/upload-pack.c
index ca7f941..cd47de6 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -393,13 +393,13 @@ static int get_common_commits(void)
if (multi_ack == 2 && got_common
&& !got_other && ok_to_give_up()) {
sent_ready = 1;
- packet_write(1, "ACK %s ready\n", last_hex);
+ packet_write_fmt(1, "ACK %s ready\n", last_hex);
}
if (have_obj.nr == 0 || multi_ack)
- packet_write(1, "NAK\n");
+ packet_write_fmt(1, "NAK\n");
if (no_done && sent_ready) {
- packet_write(1, "ACK %s\n", last_hex);
+ packet_write_fmt(1, "ACK %s\n", last_hex);
return 0;
}
if (stateless_rpc)
@@ -416,20 +416,20 @@ static int get_common_commits(void)
const char *hex = sha1_to_hex(sha1);
if (multi_ack == 2) {
sent_ready = 1;
- packet_write(1, "ACK %s ready\n", hex);
+ packet_write_fmt(1, "ACK %s ready\n", hex);
} else
- packet_write(1, "ACK %s continue\n", hex);
+ packet_write_fmt(1, "ACK %s continue\n", hex);
}
break;
default:
got_common = 1;
memcpy(last_hex, sha1_to_hex(sha1), 41);
if (multi_ack == 2)
- packet_write(1, "ACK %s common\n", last_hex);
+ packet_write_fmt(1, "ACK %s common\n", last_hex);
else if (multi_ack)
- packet_write(1, "ACK %s continue\n", last_hex);
+ packet_write_fmt(1, "ACK %s continue\n", last_hex);
else if (have_obj.nr == 1)
- packet_write(1, "ACK %s\n", last_hex);
+ packet_write_fmt(1, "ACK %s\n", last_hex);
break;
}
continue;
@@ -437,10 +437,10 @@ static int get_common_commits(void)
if (!strcmp(line, "done")) {
if (have_obj.nr > 0) {
if (multi_ack)
- packet_write(1, "ACK %s\n", last_hex);
+ packet_write_fmt(1, "ACK %s\n", last_hex);
return 0;
}
- packet_write(1, "NAK\n");
+ packet_write_fmt(1, "NAK\n");
return -1;
}
die("git upload-pack: expected SHA1 list, got '%s'", line);
@@ -650,7 +650,7 @@ static void receive_needs(void)
while (result) {
struct object *object = &result->item->object;
if (!(object->flags & (CLIENT_SHALLOW|NOT_SHALLOW))) {
- packet_write(1, "shallow %s",
+ packet_write_fmt(1, "shallow %s",
oid_to_hex(&object->oid));
register_shallow(object->oid.hash);
shallow_nr++;
@@ -662,7 +662,7 @@ static void receive_needs(void)
struct object *object = shallows.objects[i].item;
if (object->flags & NOT_SHALLOW) {
struct commit_list *parents;
- packet_write(1, "unshallow %s",
+ packet_write_fmt(1, "unshallow %s",
oid_to_hex(&object->oid));
object->flags &= ~CLIENT_SHALLOW;
/* make sure the real parents are parsed */
@@ -741,7 +741,7 @@ static int send_ref(const char *refname, const struct object_id *oid,
struct strbuf symref_info = STRBUF_INIT;
format_symref_info(&symref_info, cb_data);
- packet_write(1, "%s %s%c%s%s%s%s%s agent=%s\n",
+ packet_write_fmt(1, "%s %s%c%s%s%s%s%s agent=%s\n",
oid_to_hex(oid), refname_nons,
0, capabilities,
(allow_unadvertised_object_request & ALLOW_TIP_SHA1) ?
@@ -753,11 +753,11 @@ static int send_ref(const char *refname, const struct object_id *oid,
git_user_agent_sanitized());
strbuf_release(&symref_info);
} else {
- packet_write(1, "%s %s\n", oid_to_hex(oid), refname_nons);
+ packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), refname_nons);
}
capabilities = NULL;
if (!peel_ref(refname, peeled.hash))
- packet_write(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
+ packet_write_fmt(1, "%s %s^{}\n", oid_to_hex(&peeled), refname_nons);
return 0;
}
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 06/14] pkt-line: extract set_packet_header()
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (4 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 05/14] pkt-line: rename packet_write() to packet_write_fmt() larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 07/14] pkt-line: add packet_write_fmt_gently() larsxschneider
` (8 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
Extracted set_packet_header() function converts an integer to a 4 byte
hex string. Make this function locally available so that other pkt-line
functions could use it.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pkt-line.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/pkt-line.c b/pkt-line.c
index 0a9b61c..e8adc0f 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -97,10 +97,20 @@ void packet_buf_flush(struct strbuf *buf)
strbuf_add(buf, "0000", 4);
}
-#define hex(a) (hexchar[(a) & 15])
-static void format_packet(struct strbuf *out, const char *fmt, va_list args)
+static void set_packet_header(char *buf, const int size)
{
static char hexchar[] = "0123456789abcdef";
+
+ #define hex(a) (hexchar[(a) & 15])
+ buf[0] = hex(size >> 12);
+ buf[1] = hex(size >> 8);
+ buf[2] = hex(size >> 4);
+ buf[3] = hex(size);
+ #undef hex
+}
+
+static void format_packet(struct strbuf *out, const char *fmt, va_list args)
+{
size_t orig_len, n;
orig_len = out->len;
@@ -111,10 +121,7 @@ static void format_packet(struct strbuf *out, const char *fmt, va_list args)
if (n > LARGE_PACKET_MAX)
die("protocol error: impossibly long line");
- out->buf[orig_len + 0] = hex(n >> 12);
- out->buf[orig_len + 1] = hex(n >> 8);
- out->buf[orig_len + 2] = hex(n >> 4);
- out->buf[orig_len + 3] = hex(n);
+ set_packet_header(&out->buf[orig_len], n);
packet_trace(out->buf + orig_len + 4, n - 4, 1);
}
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 07/14] pkt-line: add packet_write_fmt_gently()
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (5 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 06/14] pkt-line: extract set_packet_header() larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 08/14] pkt-line: add packet_flush_gently() larsxschneider
` (7 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
packet_write_fmt() would die in case of a write error even though for
some callers an error would be acceptable. Add packet_write_fmt_gently()
which writes a formatted pkt-line like packet_write_fmt() but does not
die in case of an error. The function is used in a subsequent patch.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pkt-line.c | 34 ++++++++++++++++++++++++++++++----
pkt-line.h | 1 +
2 files changed, 31 insertions(+), 4 deletions(-)
diff --git a/pkt-line.c b/pkt-line.c
index e8adc0f..56915f0 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -125,16 +125,42 @@ static void format_packet(struct strbuf *out, const char *fmt, va_list args)
packet_trace(out->buf + orig_len + 4, n - 4, 1);
}
+static int packet_write_fmt_1(int fd, int gently,
+ const char *fmt, va_list args)
+{
+ struct strbuf buf = STRBUF_INIT;
+ ssize_t count;
+
+ format_packet(&buf, fmt, args);
+ count = write_in_full(fd, buf.buf, buf.len);
+ if (count == buf.len)
+ return 0;
+
+ if (!gently) {
+ check_pipe(errno);
+ die_errno("packet write with format failed");
+ }
+ return error("packet write with format failed");
+}
+
void packet_write_fmt(int fd, const char *fmt, ...)
{
- static struct strbuf buf = STRBUF_INIT;
va_list args;
- strbuf_reset(&buf);
va_start(args, fmt);
- format_packet(&buf, fmt, args);
+ packet_write_fmt_1(fd, 0, fmt, args);
+ va_end(args);
+}
+
+int packet_write_fmt_gently(int fd, const char *fmt, ...)
+{
+ int status;
+ va_list args;
+
+ va_start(args, fmt);
+ status = packet_write_fmt_1(fd, 1, fmt, args);
va_end(args);
- write_or_die(fd, buf.buf, buf.len);
+ return status;
}
void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
diff --git a/pkt-line.h b/pkt-line.h
index 1902fb3..3caea77 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -23,6 +23,7 @@ void packet_flush(int fd);
void packet_write_fmt(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
void packet_buf_flush(struct strbuf *buf);
void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
+int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
/*
* Read a packetized line into the buffer, which must be at least size bytes
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 08/14] pkt-line: add packet_flush_gently()
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (6 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 07/14] pkt-line: add packet_write_fmt_gently() larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 09/14] pkt-line: add packet_write_gently() larsxschneider
` (6 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
packet_flush() would die in case of a write error even though for some
callers an error would be acceptable. Add packet_flush_gently() which
writes a pkt-line flush packet like packet_flush() but does not die in
case of an error. The function is used in a subsequent patch.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pkt-line.c | 8 ++++++++
pkt-line.h | 1 +
2 files changed, 9 insertions(+)
diff --git a/pkt-line.c b/pkt-line.c
index 56915f0..286eb09 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -91,6 +91,14 @@ void packet_flush(int fd)
write_or_die(fd, "0000", 4);
}
+int packet_flush_gently(int fd)
+{
+ packet_trace("0000", 4, 1);
+ if (write_in_full(fd, "0000", 4) == 4)
+ return 0;
+ return error("flush packet write failed");
+}
+
void packet_buf_flush(struct strbuf *buf)
{
packet_trace("0000", 4, 1);
diff --git a/pkt-line.h b/pkt-line.h
index 3caea77..3fa0899 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -23,6 +23,7 @@ void packet_flush(int fd);
void packet_write_fmt(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
void packet_buf_flush(struct strbuf *buf);
void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
+int packet_flush_gently(int fd);
int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
/*
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 09/14] pkt-line: add packet_write_gently()
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (7 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 08/14] pkt-line: add packet_flush_gently() larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 19:33 ` Junio C Hamano
2016-10-04 12:59 ` [PATCH v9 10/14] pkt-line: add functions to read/write flush terminated packet streams larsxschneider
` (5 subsequent siblings)
14 siblings, 1 reply; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
packet_write_fmt_gently() uses format_packet() which lets the caller
only send string data via "%s". That means it cannot be used for
arbitrary data that may contain NULs.
Add packet_write_gently() which writes arbitrary data and does not die
in case of an error. The function is used by other pkt-line functions in
a subsequent patch.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pkt-line.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/pkt-line.c b/pkt-line.c
index 286eb09..3fd4dc0 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -171,6 +171,22 @@ int packet_write_fmt_gently(int fd, const char *fmt, ...)
return status;
}
+static int packet_write_gently(const int fd_out, const char *buf, size_t size)
+{
+ static char packet_write_buffer[LARGE_PACKET_MAX];
+ const size_t packet_size = size + 4;
+
+ if (packet_size > sizeof(packet_write_buffer))
+ return error("packet write failed - data exceeds max packet size");
+
+ packet_trace(buf, size, 1);
+ set_packet_header(packet_write_buffer, packet_size);
+ memcpy(packet_write_buffer + 4, buf, size);
+ if (write_in_full(fd_out, packet_write_buffer, packet_size) == packet_size)
+ return 0;
+ return error("packet write failed");
+}
+
void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
{
va_list args;
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v9 09/14] pkt-line: add packet_write_gently()
2016-10-04 12:59 ` [PATCH v9 09/14] pkt-line: add packet_write_gently() larsxschneider
@ 2016-10-04 19:33 ` Junio C Hamano
2016-10-05 19:06 ` Lars Schneider
0 siblings, 1 reply; 28+ messages in thread
From: Junio C Hamano @ 2016-10-04 19:33 UTC (permalink / raw)
To: larsxschneider; +Cc: git, ramsay, jnareb, j6t, tboegi, peff, mlbright
larsxschneider@gmail.com writes:
> From: Lars Schneider <larsxschneider@gmail.com>
>
> packet_write_fmt_gently() uses format_packet() which lets the caller
> only send string data via "%s". That means it cannot be used for
> arbitrary data that may contain NULs.
>
> Add packet_write_gently() which writes arbitrary data and does not die
> in case of an error. The function is used by other pkt-line functions in
> a subsequent patch.
>
> Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> ---
> pkt-line.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/pkt-line.c b/pkt-line.c
> index 286eb09..3fd4dc0 100644
> --- a/pkt-line.c
> +++ b/pkt-line.c
> @@ -171,6 +171,22 @@ int packet_write_fmt_gently(int fd, const char *fmt, ...)
> return status;
> }
>
> +static int packet_write_gently(const int fd_out, const char *buf, size_t size)
> +{
> + static char packet_write_buffer[LARGE_PACKET_MAX];
> + const size_t packet_size = size + 4;
> +
> + if (packet_size > sizeof(packet_write_buffer))
> + return error("packet write failed - data exceeds max packet size");
Hmph, in the previous round, this used to be "is the size larger
than sizeof(..) - 4?", which avoided integer overflow issue rather
nicely and more idiomatic. If size is near the size_t's max,
packet_size may wrap around to become very small, and we won't hit
this error, will we?
> + packet_trace(buf, size, 1);
> + set_packet_header(packet_write_buffer, packet_size);
> + memcpy(packet_write_buffer + 4, buf, size);
> + if (write_in_full(fd_out, packet_write_buffer, packet_size) == packet_size)
> + return 0;
> + return error("packet write failed");
> +}
> +
> void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
> {
> va_list args;
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v9 09/14] pkt-line: add packet_write_gently()
2016-10-04 19:33 ` Junio C Hamano
@ 2016-10-05 19:06 ` Lars Schneider
2016-10-06 17:25 ` Junio C Hamano
0 siblings, 1 reply; 28+ messages in thread
From: Lars Schneider @ 2016-10-05 19:06 UTC (permalink / raw)
To: Junio C Hamano; +Cc: git, ramsay, jnareb, j6t, tboegi, peff, mlbright
> On 04 Oct 2016, at 21:33, Junio C Hamano <gitster@pobox.com> wrote:
>
> larsxschneider@gmail.com writes:
>
>> From: Lars Schneider <larsxschneider@gmail.com>
>>
>>
>> +static int packet_write_gently(const int fd_out, const char *buf, size_t size)
>> +{
>> + static char packet_write_buffer[LARGE_PACKET_MAX];
>> + const size_t packet_size = size + 4;
>> +
>> + if (packet_size > sizeof(packet_write_buffer))
>> + return error("packet write failed - data exceeds max packet size");
>
> Hmph, in the previous round, this used to be "is the size larger
> than sizeof(..) - 4?", which avoided integer overflow issue rather
> nicely and more idiomatic. If size is near the size_t's max,
> packet_size may wrap around to become very small, and we won't hit
> this error, will we?
You are right. Would the solution below be acceptable?
I would like to keep the `packet_size` variable as it eases the rest
of the function.
const size_t packet_size = size + 4;
- if (packet_size > sizeof(packet_write_buffer))
+ if (size > sizeof(packet_write_buffer) - 4)
return error("packet write failed - data exceeds max packet size");
Thanks,
Lars
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v9 09/14] pkt-line: add packet_write_gently()
2016-10-05 19:06 ` Lars Schneider
@ 2016-10-06 17:25 ` Junio C Hamano
0 siblings, 0 replies; 28+ messages in thread
From: Junio C Hamano @ 2016-10-06 17:25 UTC (permalink / raw)
To: Lars Schneider; +Cc: git, ramsay, jnareb, j6t, tboegi, peff, mlbright
Lars Schneider <larsxschneider@gmail.com> writes:
> You are right. Would the solution below be acceptable?
> I would like to keep the `packet_size` variable as it eases the rest
> of the function.
>
>
> const size_t packet_size = size + 4;
>
> - if (packet_size > sizeof(packet_write_buffer))
> + if (size > sizeof(packet_write_buffer) - 4)
> return error("packet write failed - data exceeds max packet size");
Sounds fine; packet_size may have invalid value if size is large
enough but in such a case the function would return without using
it, so no harm is expected, I would say. I'd prefer to see the
definition of packet_size separate from the assignment of size + 4
to it in a case like this, though.
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v9 10/14] pkt-line: add functions to read/write flush terminated packet streams
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (8 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 09/14] pkt-line: add packet_write_gently() larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 19:53 ` Junio C Hamano
2016-10-04 12:59 ` [PATCH v9 11/14] convert: make apply_filter() adhere to standard Git error handling larsxschneider
` (4 subsequent siblings)
14 siblings, 1 reply; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
write_packetized_from_fd() and write_packetized_from_buf() write a
stream of packets. All content packets use the maximal packet size
except for the last one. After the last content packet a `flush` control
packet is written.
read_packetized_to_strbuf() reads arbitrary sized packets until it
detects a `flush` packet.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
pkt-line.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
pkt-line.h | 8 ++++++++
2 files changed, 77 insertions(+)
diff --git a/pkt-line.c b/pkt-line.c
index 3fd4dc0..8ffde22 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -196,6 +196,47 @@ void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
va_end(args);
}
+int write_packetized_from_fd(int fd_in, int fd_out)
+{
+ static char buf[LARGE_PACKET_DATA_MAX];
+ int err = 0;
+ ssize_t bytes_to_write;
+
+ while (!err) {
+ bytes_to_write = xread(fd_in, buf, sizeof(buf));
+ if (bytes_to_write < 0)
+ return COPY_READ_ERROR;
+ if (bytes_to_write == 0)
+ break;
+ err = packet_write_gently(fd_out, buf, bytes_to_write);
+ }
+ if (!err)
+ err = packet_flush_gently(fd_out);
+ return err;
+}
+
+int write_packetized_from_buf(const char *src_in, size_t len, int fd_out)
+{
+ static char buf[LARGE_PACKET_DATA_MAX];
+ int err = 0;
+ size_t bytes_written = 0;
+ size_t bytes_to_write;
+
+ while (!err) {
+ if ((len - bytes_written) > sizeof(buf))
+ bytes_to_write = sizeof(buf);
+ else
+ bytes_to_write = len - bytes_written;
+ if (bytes_to_write == 0)
+ break;
+ err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write);
+ bytes_written += bytes_to_write;
+ }
+ if (!err)
+ err = packet_flush_gently(fd_out);
+ return err;
+}
+
static int get_packet_data(int fd, char **src_buf, size_t *src_size,
void *dst, unsigned size, int options)
{
@@ -305,3 +346,31 @@ char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len)
{
return packet_read_line_generic(-1, src, src_len, dst_len);
}
+
+ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out)
+{
+ int packet_len;
+
+ size_t orig_len = sb_out->len;
+ size_t orig_alloc = sb_out->alloc;
+
+ for (;;) {
+ strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX);
+ packet_len = packet_read(fd_in, NULL, NULL,
+ // TODO: explain + 1
+ sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1,
+ PACKET_READ_GENTLE_ON_EOF);
+ if (packet_len <= 0)
+ break;
+ sb_out->len += packet_len;
+ }
+
+ if (packet_len < 0) {
+ if (orig_alloc == 0)
+ strbuf_release(sb_out);
+ else
+ strbuf_setlen(sb_out, orig_len);
+ return packet_len;
+ }
+ return sb_out->len - orig_len;
+}
diff --git a/pkt-line.h b/pkt-line.h
index 3fa0899..18eac64 100644
--- a/pkt-line.h
+++ b/pkt-line.h
@@ -25,6 +25,8 @@ void packet_buf_flush(struct strbuf *buf);
void packet_buf_write(struct strbuf *buf, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
int packet_flush_gently(int fd);
int packet_write_fmt_gently(int fd, const char *fmt, ...) __attribute__((format (printf, 2, 3)));
+int write_packetized_from_fd(int fd_in, int fd_out);
+int write_packetized_from_buf(const char *src_in, size_t len, int fd_out);
/*
* Read a packetized line into the buffer, which must be at least size bytes
@@ -77,8 +79,14 @@ char *packet_read_line(int fd, int *size);
*/
char *packet_read_line_buf(char **src_buf, size_t *src_len, int *size);
+/*
+ * Reads a stream of variable sized packets until a flush packet is detected.
+ */
+ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out);
+
#define DEFAULT_PACKET_MAX 1000
#define LARGE_PACKET_MAX 65520
+#define LARGE_PACKET_DATA_MAX (LARGE_PACKET_MAX - 4)
extern char packet_buffer[LARGE_PACKET_MAX];
#endif
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v9 10/14] pkt-line: add functions to read/write flush terminated packet streams
2016-10-04 12:59 ` [PATCH v9 10/14] pkt-line: add functions to read/write flush terminated packet streams larsxschneider
@ 2016-10-04 19:53 ` Junio C Hamano
2016-10-04 19:58 ` Junio C Hamano
2016-10-05 17:35 ` Lars Schneider
0 siblings, 2 replies; 28+ messages in thread
From: Junio C Hamano @ 2016-10-04 19:53 UTC (permalink / raw)
To: larsxschneider; +Cc: git, ramsay, jnareb, j6t, tboegi, peff, mlbright
larsxschneider@gmail.com writes:
> From: Lars Schneider <larsxschneider@gmail.com>
>
> write_packetized_from_fd() and write_packetized_from_buf() write a
> stream of packets. All content packets use the maximal packet size
> except for the last one. After the last content packet a `flush` control
> packet is written.
>
> read_packetized_to_strbuf() reads arbitrary sized packets until it
> detects a `flush` packet.
>
> Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
> Signed-off-by: Junio C Hamano <gitster@pobox.com>
> ---
> pkt-line.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> pkt-line.h | 8 ++++++++
> 2 files changed, 77 insertions(+)
>
> diff --git a/pkt-line.c b/pkt-line.c
> index 3fd4dc0..8ffde22 100644
> --- a/pkt-line.c
> +++ b/pkt-line.c
> @@ -196,6 +196,47 @@ void packet_buf_write(struct strbuf *buf, const char *fmt, ...)
> va_end(args);
> }
>
> +int write_packetized_from_fd(int fd_in, int fd_out)
> +{
> + static char buf[LARGE_PACKET_DATA_MAX];
> + int err = 0;
> + ssize_t bytes_to_write;
> +
> + while (!err) {
> + bytes_to_write = xread(fd_in, buf, sizeof(buf));
> + if (bytes_to_write < 0)
> + return COPY_READ_ERROR;
> + if (bytes_to_write == 0)
> + break;
> + err = packet_write_gently(fd_out, buf, bytes_to_write);
> + }
> + if (!err)
> + err = packet_flush_gently(fd_out);
> + return err;
> +}
OK.
> +int write_packetized_from_buf(const char *src_in, size_t len, int fd_out)
> +{
> + static char buf[LARGE_PACKET_DATA_MAX];
> + int err = 0;
> + size_t bytes_written = 0;
> + size_t bytes_to_write;
> +
> + while (!err) {
> + if ((len - bytes_written) > sizeof(buf))
> + bytes_to_write = sizeof(buf);
> + else
> + bytes_to_write = len - bytes_written;
> + if (bytes_to_write == 0)
> + break;
> + err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write);
> + bytes_written += bytes_to_write;
> + }
> + if (!err)
> + err = packet_flush_gently(fd_out);
> + return err;
> +}
Hmph, what is buf[] used for, other than its sizeof() taken to yield
a constant LARGE_PACKET_DATA_MAX?
> @@ -305,3 +346,31 @@ char *packet_read_line_buf(char **src, size_t *src_len, int *dst_len)
> {
> return packet_read_line_generic(-1, src, src_len, dst_len);
> }
> +
> +ssize_t read_packetized_to_strbuf(int fd_in, struct strbuf *sb_out)
> +{
> + int packet_len;
> +
> + size_t orig_len = sb_out->len;
> + size_t orig_alloc = sb_out->alloc;
> +
> + for (;;) {
> + strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX);
> + packet_len = packet_read(fd_in, NULL, NULL,
> + // TODO: explain + 1
No // C99 comment please.
And I agree that the +1 needs to be explained.
> + sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1,
> + PACKET_READ_GENTLE_ON_EOF);
> + if (packet_len <= 0)
> + break;
Hmph. So at the end of a data stream, we ask packet_read() to read
64kB or so, packet_read() gets the packet length by calling
get_packet_data() and then another get_packet_data() reads that much
and return. What happens during the next round? The first call to
get_packet_data() in packet_read() will find that the stream has
ended and returns -1, which is stored in packet_len here? But then
the data is discarded after the loop when packet_len is negative.
I must be missing something. Is the other side always supposed to
give a flush packet or something? Perhaps that is what is happening
here. If so, I am OK with that, even though it somehow sounds a bit
wasteful.
^ permalink raw reply [flat|nested] 28+ messages in thread* Re: [PATCH v9 10/14] pkt-line: add functions to read/write flush terminated packet streams
2016-10-04 19:53 ` Junio C Hamano
@ 2016-10-04 19:58 ` Junio C Hamano
2016-10-05 17:35 ` Lars Schneider
1 sibling, 0 replies; 28+ messages in thread
From: Junio C Hamano @ 2016-10-04 19:58 UTC (permalink / raw)
To: larsxschneider; +Cc: git, ramsay, jnareb, j6t, tboegi, peff, mlbright
Junio C Hamano <gitster@pobox.com> writes:
> I must be missing something. Is the other side always supposed to
> give a flush packet or something? Perhaps that is what is happening
> here. If so, I am OK with that, even though it somehow sounds a bit
> wasteful.
Ah, scratch that. What I was missing was that this channel is
designed to carry multiple interactions and delimiting with EOF
which by definition can happen only once cannot be a norm.
Expecting a flush to declare the current stream terminated is
perfectly fine.
^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH v9 10/14] pkt-line: add functions to read/write flush terminated packet streams
2016-10-04 19:53 ` Junio C Hamano
2016-10-04 19:58 ` Junio C Hamano
@ 2016-10-05 17:35 ` Lars Schneider
1 sibling, 0 replies; 28+ messages in thread
From: Lars Schneider @ 2016-10-05 17:35 UTC (permalink / raw)
To: Junio C Hamano
Cc: git, Ramsay Jones, Jakub Narębski, Johannes Sixt,
Torsten Bögershausen, Jeff King, mlbright
> On 04 Oct 2016, at 21:53, Junio C Hamano <gitster@pobox.com> wrote:
>
> larsxschneider@gmail.com writes:
>
>> From: Lars Schneider <larsxschneider@gmail.com>
>>
>
>> +int write_packetized_from_buf(const char *src_in, size_t len, int fd_out)
>> +{
>> + static char buf[LARGE_PACKET_DATA_MAX];
>> + int err = 0;
>> + size_t bytes_written = 0;
>> + size_t bytes_to_write;
>> +
>> + while (!err) {
>> + if ((len - bytes_written) > sizeof(buf))
>> + bytes_to_write = sizeof(buf);
>> + else
>> + bytes_to_write = len - bytes_written;
>> + if (bytes_to_write == 0)
>> + break;
>> + err = packet_write_gently(fd_out, src_in + bytes_written, bytes_to_write);
>> + bytes_written += bytes_to_write;
>> + }
>> + if (!err)
>> + err = packet_flush_gently(fd_out);
>> + return err;
>> +}
>
> Hmph, what is buf[] used for, other than its sizeof() taken to yield
> a constant LARGE_PACKET_DATA_MAX?
Agreed. This is stupid. I will fix it.
>>
>> + for (;;) {
>> + strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX);
>> + packet_len = packet_read(fd_in, NULL, NULL,
>> + // TODO: explain + 1
>
> No // C99 comment please.
>
> And I agree that the +1 needs to be explained.
Oh. I did not send the very latest version :-(
Is this explanation OK?
+ strbuf_grow(sb_out, LARGE_PACKET_DATA_MAX);
+ packet_len = packet_read(fd_in, NULL, NULL,
+ /* strbuf_grow() above always allocates one extra byte to
+ * store a '\0' at the end of the string. packet_read()
+ * writes a '\0' extra byte at the end, too. Let it know
+ * that there is already room for the extra byte.
+ */
+ sb_out->buf + sb_out->len, LARGE_PACKET_DATA_MAX+1,
+ PACKET_READ_GENTLE_ON_EOF);
Thanks,
Lars
^ permalink raw reply [flat|nested] 28+ messages in thread
* [PATCH v9 11/14] convert: make apply_filter() adhere to standard Git error handling
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (9 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 10/14] pkt-line: add functions to read/write flush terminated packet streams larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 12/14] convert: prepare filter.<driver>.process option larsxschneider
` (3 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
apply_filter() returns a boolean that tells the caller if it
"did convert or did not convert". The variable `ret` was used throughout
the function to track errors whereas `1` denoted success and `0`
failure. This is unusual for the Git source where `0` denotes success.
Rename the variable and flip its value to make the function easier
readable for Git developers.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
convert.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
diff --git a/convert.c b/convert.c
index 986c239..597f561 100644
--- a/convert.c
+++ b/convert.c
@@ -451,7 +451,7 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
*
* (child --> cmd) --> us
*/
- int ret = 1;
+ int err = 0;
struct strbuf nbuf = STRBUF_INIT;
struct async async;
struct filter_params params;
@@ -477,23 +477,20 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
return 0; /* error was already reported */
if (strbuf_read(&nbuf, async.out, len) < 0) {
- error("read from external filter '%s' failed", cmd);
- ret = 0;
+ err = error("read from external filter '%s' failed", cmd);
}
if (close(async.out)) {
- error("read from external filter '%s' failed", cmd);
- ret = 0;
+ err = error("read from external filter '%s' failed", cmd);
}
if (finish_async(&async)) {
- error("external filter '%s' failed", cmd);
- ret = 0;
+ err = error("external filter '%s' failed", cmd);
}
- if (ret) {
+ if (!err) {
strbuf_swap(dst, &nbuf);
}
strbuf_release(&nbuf);
- return ret;
+ return !err;
}
static struct convert_driver {
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 12/14] convert: prepare filter.<driver>.process option
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (10 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 11/14] convert: make apply_filter() adhere to standard Git error handling larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 13/14] convert: add " larsxschneider
` (2 subsequent siblings)
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
Refactor the existing 'single shot filter mechanism' and prepare the
new 'long running filter mechanism'.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
---
convert.c | 60 ++++++++++++++++++++++++++++++++++--------------------------
1 file changed, 34 insertions(+), 26 deletions(-)
diff --git a/convert.c b/convert.c
index 597f561..71e11ff 100644
--- a/convert.c
+++ b/convert.c
@@ -442,7 +442,7 @@ static int filter_buffer_or_fd(int in, int out, void *data)
return (write_err || status);
}
-static int apply_filter(const char *path, const char *src, size_t len, int fd,
+static int apply_single_file_filter(const char *path, const char *src, size_t len, int fd,
struct strbuf *dst, const char *cmd)
{
/*
@@ -456,12 +456,6 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
struct async async;
struct filter_params params;
- if (!cmd || !*cmd)
- return 0;
-
- if (!dst)
- return 1;
-
memset(&async, 0, sizeof(async));
async.proc = filter_buffer_or_fd;
async.data = ¶ms;
@@ -493,6 +487,9 @@ static int apply_filter(const char *path, const char *src, size_t len, int fd,
return !err;
}
+#define CAP_CLEAN (1u<<0)
+#define CAP_SMUDGE (1u<<1)
+
static struct convert_driver {
const char *name;
struct convert_driver *next;
@@ -501,6 +498,29 @@ static struct convert_driver {
int required;
} *user_convert, **user_convert_tail;
+static int apply_filter(const char *path, const char *src, size_t len,
+ int fd, struct strbuf *dst, struct convert_driver *drv,
+ const unsigned int wanted_capability)
+{
+ const char *cmd = NULL;
+
+ if (!drv)
+ return 0;
+
+ if (!dst)
+ return 1;
+
+ if ((CAP_CLEAN & wanted_capability) && drv->clean)
+ cmd = drv->clean;
+ else if ((CAP_SMUDGE & wanted_capability) && drv->smudge)
+ cmd = drv->smudge;
+
+ if (cmd && *cmd)
+ return apply_single_file_filter(path, src, len, fd, dst, cmd);
+
+ return 0;
+}
+
static int read_convert_config(const char *var, const char *value, void *cb)
{
const char *key, *name;
@@ -839,7 +859,7 @@ int would_convert_to_git_filter_fd(const char *path)
if (!ca.drv->required)
return 0;
- return apply_filter(path, NULL, 0, -1, NULL, ca.drv->clean);
+ return apply_filter(path, NULL, 0, -1, NULL, ca.drv, CAP_CLEAN);
}
const char *get_convert_attr_ascii(const char *path)
@@ -872,18 +892,12 @@ int convert_to_git(const char *path, const char *src, size_t len,
struct strbuf *dst, enum safe_crlf checksafe)
{
int ret = 0;
- const char *filter = NULL;
- int required = 0;
struct conv_attrs ca;
convert_attrs(&ca, path);
- if (ca.drv) {
- filter = ca.drv->clean;
- required = ca.drv->required;
- }
- ret |= apply_filter(path, src, len, -1, dst, filter);
- if (!ret && required)
+ ret |= apply_filter(path, src, len, -1, dst, ca.drv, CAP_CLEAN);
+ if (!ret && ca.drv && ca.drv->required)
die("%s: clean filter '%s' failed", path, ca.drv->name);
if (ret && dst) {
@@ -907,7 +921,7 @@ void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst,
assert(ca.drv);
assert(ca.drv->clean);
- if (!apply_filter(path, NULL, 0, fd, dst, ca.drv->clean))
+ if (!apply_filter(path, NULL, 0, fd, dst, ca.drv, CAP_CLEAN))
die("%s: clean filter '%s' failed", path, ca.drv->name);
crlf_to_git(path, dst->buf, dst->len, dst, ca.crlf_action, checksafe);
@@ -919,15 +933,9 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
int normalizing)
{
int ret = 0, ret_filter = 0;
- const char *filter = NULL;
- int required = 0;
struct conv_attrs ca;
convert_attrs(&ca, path);
- if (ca.drv) {
- filter = ca.drv->smudge;
- required = ca.drv->required;
- }
ret |= ident_to_worktree(path, src, len, dst, ca.ident);
if (ret) {
@@ -938,7 +946,7 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
* CRLF conversion can be skipped if normalizing, unless there
* is a smudge filter. The filter might expect CRLFs.
*/
- if (filter || !normalizing) {
+ if ((ca.drv && ca.drv->smudge) || !normalizing) {
ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action);
if (ret) {
src = dst->buf;
@@ -946,8 +954,8 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
}
}
- ret_filter = apply_filter(path, src, len, -1, dst, filter);
- if (!ret_filter && required)
+ ret_filter = apply_filter(path, src, len, -1, dst, ca.drv, CAP_SMUDGE);
+ if (!ret_filter && ca.drv && ca.drv->required)
die("%s: smudge filter %s failed", path, ca.drv->name);
return ret | ret_filter;
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 13/14] convert: add filter.<driver>.process option
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (11 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 12/14] convert: prepare filter.<driver>.process option larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-04 12:59 ` [PATCH v9 14/14] contrib/long-running-filter: add long running filter example larsxschneider
2016-10-05 22:31 ` [PATCH v9 00/14] Git filter protocol Jakub Narębski
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
Git's clean/smudge mechanism invokes an external filter process for
every single blob that is affected by a filter. If Git filters a lot of
blobs then the startup time of the external filter processes can become
a significant part of the overall Git execution time.
In a preliminary performance test this developer used a clean/smudge
filter written in golang to filter 12,000 files. This process took 364s
with the existing filter mechanism and 5s with the new mechanism. See
details here: https://github.com/github/git-lfs/pull/1382
This patch adds the `filter.<driver>.process` string option which, if
used, keeps the external filter process running and processes all blobs
with the packet format (pkt-line) based protocol over standard input and
standard output. The full protocol is explained in detail in
`Documentation/gitattributes.txt`.
A few key decisions:
* The long running filter process is referred to as filter protocol
version 2 because the existing single shot filter invocation is
considered version 1.
* Git sends a welcome message and expects a response right after the
external filter process has started. This ensures that Git will not
hang if a version 1 filter is incorrectly used with the
filter.<driver>.process option for version 2 filters. In addition,
Git can detect this kind of error and warn the user.
* The status of a filter operation (e.g. "success" or "error) is set
before the actual response and (if necessary!) re-set after the
response. The advantage of this two step status response is that if
the filter detects an error early, then the filter can communicate
this and Git does not even need to create structures to read the
response.
* All status responses are pkt-line lists terminated with a flush
packet. This allows us to send other status fields with the same
protocol in the future.
Helped-by: Martin-Louis Bright <mlbright@gmail.com>
Reviewed-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
Documentation/gitattributes.txt | 157 +++++++++++++-
convert.c | 295 +++++++++++++++++++++++++-
t/t0021-conversion.sh | 447 +++++++++++++++++++++++++++++++++++++++-
t/t0021/rot13-filter.pl | 191 +++++++++++++++++
4 files changed, 1080 insertions(+), 10 deletions(-)
create mode 100755 t/t0021/rot13-filter.pl
diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 7aff940..5868f00 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -293,7 +293,13 @@ checkout, when the `smudge` command is specified, the command is
fed the blob object from its standard input, and its standard
output is used to update the worktree file. Similarly, the
`clean` command is used to convert the contents of worktree file
-upon checkin.
+upon checkin. By default these commands process only a single
+blob and terminate. If a long running `process` filter is used
+in place of `clean` and/or `smudge` filters, then Git can process
+all blobs with a single filter command invocation for the entire
+life of a single Git command, for example `git add --all`. See
+section below for the description of the protocol used to
+communicate with a `process` filter.
One use of the content filtering is to massage the content into a shape
that is more convenient for the platform, filesystem, and the user to use.
@@ -373,6 +379,155 @@ not exist, or may have different contents. So, smudge and clean commands
should not try to access the file on disk, but only act as filters on the
content provided to them on standard input.
+Long Running Filter Process
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If the filter command (a string value) is defined via
+`filter.<driver>.process` then Git can process all blobs with a
+single filter invocation for the entire life of a single Git
+command. This is achieved by using a packet format (pkt-line,
+see technical/protocol-common.txt) based protocol over standard
+input and standard output as follows. All packets, except for the
+"*CONTENT" packets and the "0000" flush packet, are considered
+text and therefore are terminated by a LF.
+
+Git starts the filter when it encounters the first file
+that needs to be cleaned or smudged. After the filter started
+Git sends a welcome message ("git-filter-client"), a list of
+supported protocol version numbers, and a flush packet. Git expects
+to read a welcome response message ("git-filter-server") and exactly
+one protocol version number from the previously sent list. All further
+communication will be based on the selected version. The remaining
+protocol description below documents "version=2". Please note that
+"version=42" in the example below does not exist and is only there
+to illustrate how the protocol would look like with more than one
+version.
+
+After the version negotiation Git sends a list of all capabilities that
+it supports and a flush packet. Git expects to read a list of desired
+capabilities, which must be a subset of the supported capabilities list,
+and a flush packet as response:
+------------------------
+packet: git> git-filter-client
+packet: git> version=2
+packet: git> version=42
+packet: git> 0000
+packet: git< git-filter-server
+packet: git< version=2
+packet: git> clean=true
+packet: git> smudge=true
+packet: git> not-yet-invented=true
+packet: git> 0000
+packet: git< clean=true
+packet: git< smudge=true
+packet: git< 0000
+------------------------
+Supported filter capabilities in version 2 are "clean" and
+"smudge".
+
+Afterwards Git sends a list of "key=value" pairs terminated with
+a flush packet. The list will contain at least the filter command
+(based on the supported capabilities) and the pathname of the file
+to filter relative to the repository root. Right after these packets
+Git sends the content split in zero or more pkt-line packets and a
+flush packet to terminate content. Please note, that the filter
+must not send any response before it received the content and the
+final flush packet.
+------------------------
+packet: git> command=smudge
+packet: git> pathname=path/testfile.dat
+packet: git> 0000
+packet: git> CONTENT
+packet: git> 0000
+------------------------
+
+The filter is expected to respond with a list of "key=value" pairs
+terminated with a flush packet. If the filter does not experience
+problems then the list must contain a "success" status. Right after
+these packets the filter is expected to send the content in zero
+or more pkt-line packets and a flush packet at the end. Finally, a
+second list of "key=value" pairs terminated with a flush packet
+is expected. The filter can change the status in the second list.
+------------------------
+packet: git< status=success
+packet: git< 0000
+packet: git< SMUDGED_CONTENT
+packet: git< 0000
+packet: git< 0000 # empty list, keep "status=success" unchanged!
+------------------------
+
+If the result content is empty then the filter is expected to respond
+with a "success" status and an empty list.
+------------------------
+packet: git< status=success
+packet: git< 0000
+packet: git< 0000 # empty content!
+packet: git< 0000 # empty list, keep "status=success" unchanged!
+------------------------
+
+In case the filter cannot or does not want to process the content,
+it is expected to respond with an "error" status. Depending on the
+`filter.<driver>.required` flag Git will interpret that as error
+but it will not stop or restart the filter process.
+------------------------
+packet: git< status=error
+packet: git< 0000
+------------------------
+
+If the filter experiences an error during processing, then it can
+send the status "error" after the content was (partially or
+completely) sent. Depending on the `filter.<driver>.required` flag
+Git will interpret that as error but it will not stop or restart the
+filter process.
+------------------------
+packet: git< status=success
+packet: git< 0000
+packet: git< HALF_WRITTEN_ERRONEOUS_CONTENT
+packet: git< 0000
+packet: git< status=error
+packet: git< 0000
+------------------------
+
+If the filter dies during the communication or does not adhere to
+the protocol then Git will stop the filter process and restart it
+with the next file that needs to be processed. Depending on the
+`filter.<driver>.required` flag Git will interpret that as error.
+
+The error handling for all cases above mimic the behavior of
+the `filter.<driver>.clean` / `filter.<driver>.smudge` error
+handling.
+
+In case the filter cannot or does not want to process the content
+as well as any future content for the lifetime of the Git process,
+it is expected to respond with an "abort" status at any point in
+the protocol. Depending on the `filter.<driver>.required` flag Git
+will interpret that as error for the content as well as any future
+content for the lifetime of the Git process but it will not stop or
+restart the filter process.
+------------------------
+packet: git< status=abort
+packet: git< 0000
+------------------------
+
+After the filter has processed a blob it is expected to wait for
+the next "key=value" list containing a command. Git will close
+the command pipe on exit. The filter is expected to detect EOF
+and exit gracefully on its own.
+
+If you develop your own long running filter
+process then the `GIT_TRACE_PACKET` environment variables can be
+very helpful for debugging (see linkgit:git[1]).
+
+If a `filter.<driver>.process` command is configured then it
+always takes precedence over a configured `filter.<driver>.clean`
+or `filter.<driver>.smudge` command.
+
+Please note that you cannot use an existing `filter.<driver>.clean`
+or `filter.<driver>.smudge` command with `filter.<driver>.process`
+because the former two use a different inter process communication
+protocol than the latter one.
+
+
Interaction between checkin/checkout attributes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/convert.c b/convert.c
index 71e11ff..88581d6 100644
--- a/convert.c
+++ b/convert.c
@@ -3,6 +3,7 @@
#include "run-command.h"
#include "quote.h"
#include "sigchain.h"
+#include "pkt-line.h"
/*
* convert.c - convert a file when checking it out and checking it in.
@@ -490,11 +491,287 @@ static int apply_single_file_filter(const char *path, const char *src, size_t le
#define CAP_CLEAN (1u<<0)
#define CAP_SMUDGE (1u<<1)
+struct cmd2process {
+ struct hashmap_entry ent; /* must be the first member! */
+ unsigned int supported_capabilities;
+ const char *cmd;
+ struct child_process process;
+};
+
+static int cmd_process_map_initialized;
+static struct hashmap cmd_process_map;
+
+static int cmd2process_cmp(const struct cmd2process *e1,
+ const struct cmd2process *e2,
+ const void *unused)
+{
+ return strcmp(e1->cmd, e2->cmd);
+}
+
+static struct cmd2process *find_multi_file_filter_entry(struct hashmap *hashmap, const char *cmd)
+{
+ struct cmd2process key;
+ hashmap_entry_init(&key, strhash(cmd));
+ key.cmd = cmd;
+ return hashmap_get(hashmap, &key, NULL);
+}
+
+static void kill_multi_file_filter(struct hashmap *hashmap, struct cmd2process *entry)
+{
+ if (!entry)
+ return;
+ sigchain_push(SIGPIPE, SIG_IGN);
+ /*
+ * We kill the filter most likely because an error happened already.
+ * That's why we are not interested in any error code here.
+ */
+ close(entry->process.in);
+ close(entry->process.out);
+ sigchain_pop(SIGPIPE);
+ finish_command(&entry->process);
+ hashmap_remove(hashmap, entry, NULL);
+ free(entry);
+}
+
+static int packet_write_list(int fd, const char *line, ...)
+{
+ va_list args;
+ int err;
+ va_start(args, line);
+ for (;;) {
+ if (!line)
+ break;
+ if (strlen(line) > LARGE_PACKET_DATA_MAX)
+ return -1;
+ err = packet_write_fmt_gently(fd, "%s\n", line);
+ if (err)
+ return err;
+ line = va_arg(args, const char*);
+ }
+ va_end(args);
+ return packet_flush_gently(fd);
+}
+
+static struct cmd2process *start_multi_file_filter(struct hashmap *hashmap, const char *cmd)
+{
+ int err;
+ struct cmd2process *entry;
+ struct child_process *process;
+ const char *argv[] = { cmd, NULL };
+ struct string_list cap_list = STRING_LIST_INIT_NODUP;
+ char *cap_buf;
+ const char *cap_name;
+
+ entry = xmalloc(sizeof(*entry));
+ hashmap_entry_init(entry, strhash(cmd));
+ entry->cmd = cmd;
+ entry->supported_capabilities = 0;
+ process = &entry->process;
+
+ child_process_init(process);
+ process->argv = argv;
+ process->use_shell = 1;
+ process->in = -1;
+ process->out = -1;
+ process->wait_on_exit = 1;
+
+ if (start_command(process)) {
+ error("cannot fork to run external filter '%s'", cmd);
+ kill_multi_file_filter(hashmap, entry);
+ return NULL;
+ }
+
+ sigchain_push(SIGPIPE, SIG_IGN);
+
+ err = packet_write_list(process->in, "git-filter-client", "version=2", NULL);
+ if (err)
+ goto done;
+
+ err = strcmp(packet_read_line(process->out, NULL), "git-filter-server");
+ if (err) {
+ error("external filter '%s' does not support filter protocol version 2", cmd);
+ goto done;
+ }
+ err = strcmp(packet_read_line(process->out, NULL), "version=2");
+ if (err)
+ goto done;
+
+ err = packet_write_list(process->in, "clean=true", "smudge=true", NULL);
+
+ for (;;) {
+ cap_buf = packet_read_line(process->out, NULL);
+ if (!cap_buf)
+ break;
+ string_list_split_in_place(&cap_list, cap_buf, '=', 1);
+
+ if (cap_list.nr != 2 || strcmp(cap_list.items[1].string, "true"))
+ continue;
+
+ cap_name = cap_list.items[0].string;
+ if (!strcmp(cap_name, "clean")) {
+ entry->supported_capabilities |= CAP_CLEAN;
+ } else if (!strcmp(cap_name, "smudge")) {
+ entry->supported_capabilities |= CAP_SMUDGE;
+ } else {
+ warning(
+ "external filter '%s' requested unsupported filter capability '%s'",
+ cmd, cap_name
+ );
+ }
+
+ string_list_clear(&cap_list, 0);
+ }
+
+done:
+ sigchain_pop(SIGPIPE);
+
+ if (err || errno == EPIPE) {
+ error("initialization for external filter '%s' failed", cmd);
+ kill_multi_file_filter(hashmap, entry);
+ return NULL;
+ }
+
+ hashmap_add(hashmap, entry);
+ return entry;
+}
+
+static void read_multi_file_filter_status(int fd, struct strbuf *status) {
+ struct strbuf **pair;
+ char *line;
+ for (;;) {
+ line = packet_read_line(fd, NULL);
+ if (!line)
+ break;
+ pair = strbuf_split_str(line, '=', 2);
+ if (pair[0] && pair[0]->len && pair[1]) {
+ if (!strcmp(pair[0]->buf, "status=")) {
+ strbuf_reset(status);
+ strbuf_addbuf(status, pair[1]);
+ }
+ }
+ strbuf_list_free(pair);
+ }
+}
+
+static int apply_multi_file_filter(const char *path, const char *src, size_t len,
+ int fd, struct strbuf *dst, const char *cmd,
+ const unsigned int wanted_capability)
+{
+ int err;
+ struct cmd2process *entry;
+ struct child_process *process;
+ struct stat file_stat;
+ struct strbuf nbuf = STRBUF_INIT;
+ struct strbuf filter_status = STRBUF_INIT;
+ char *filter_type;
+
+ if (!cmd_process_map_initialized) {
+ cmd_process_map_initialized = 1;
+ hashmap_init(&cmd_process_map, (hashmap_cmp_fn) cmd2process_cmp, 0);
+ entry = NULL;
+ } else {
+ entry = find_multi_file_filter_entry(&cmd_process_map, cmd);
+ }
+
+ fflush(NULL);
+
+ if (!entry) {
+ entry = start_multi_file_filter(&cmd_process_map, cmd);
+ if (!entry)
+ return 0;
+ }
+ process = &entry->process;
+
+ if (!(wanted_capability & entry->supported_capabilities))
+ return 0;
+
+ if (CAP_CLEAN & wanted_capability)
+ filter_type = "clean";
+ else if (CAP_SMUDGE & wanted_capability)
+ filter_type = "smudge";
+ else
+ die("unexpected filter type");
+
+ if (fd >= 0 && !src) {
+ if (fstat(fd, &file_stat) == -1)
+ return 0;
+ len = xsize_t(file_stat.st_size);
+ }
+
+ sigchain_push(SIGPIPE, SIG_IGN);
+
+ assert(strlen(filter_type) < LARGE_PACKET_DATA_MAX - strlen("command=\n"));
+ err = packet_write_fmt_gently(process->in, "command=%s\n", filter_type);
+ if (err)
+ goto done;
+
+ err = strlen(path) > LARGE_PACKET_DATA_MAX - strlen("pathname=\n");
+ if (err) {
+ error("path name too long for external filter");
+ goto done;
+ }
+
+ err = packet_write_fmt_gently(process->in, "pathname=%s\n", path);
+ if (err)
+ goto done;
+
+ err = packet_flush_gently(process->in);
+ if (err)
+ goto done;
+
+ if (fd >= 0)
+ err = write_packetized_from_fd(fd, process->in);
+ else
+ err = write_packetized_from_buf(src, len, process->in);
+ if (err)
+ goto done;
+
+ read_multi_file_filter_status(process->out, &filter_status);
+ err = strcmp(filter_status.buf, "success");
+ if (err)
+ goto done;
+
+ err = read_packetized_to_strbuf(process->out, &nbuf) < 0;
+ if (err)
+ goto done;
+
+ read_multi_file_filter_status(process->out, &filter_status);
+ err = strcmp(filter_status.buf, "success");
+
+done:
+ sigchain_pop(SIGPIPE);
+
+ if (err || errno == EPIPE) {
+ if (!strcmp(filter_status.buf, "error")) {
+ /* The filter signaled a problem with the file. */
+ } else if (!strcmp(filter_status.buf, "abort")) {
+ /*
+ * The filter signaled a permanent problem. Don't try to filter
+ * files with the same command for the lifetime of the current
+ * Git process.
+ */
+ entry->supported_capabilities &= ~wanted_capability;
+ } else {
+ /*
+ * Something went wrong with the protocol filter.
+ * Force shutdown and restart if another blob requires filtering.
+ */
+ error("external filter '%s' failed", cmd);
+ kill_multi_file_filter(&cmd_process_map, entry);
+ }
+ } else {
+ strbuf_swap(dst, &nbuf);
+ }
+ strbuf_release(&nbuf);
+ return !err;
+}
+
static struct convert_driver {
const char *name;
struct convert_driver *next;
const char *smudge;
const char *clean;
+ const char *process;
int required;
} *user_convert, **user_convert_tail;
@@ -510,13 +787,15 @@ static int apply_filter(const char *path, const char *src, size_t len,
if (!dst)
return 1;
- if ((CAP_CLEAN & wanted_capability) && drv->clean)
+ if ((CAP_CLEAN & wanted_capability) && !drv->process && drv->clean)
cmd = drv->clean;
- else if ((CAP_SMUDGE & wanted_capability) && drv->smudge)
+ else if ((CAP_SMUDGE & wanted_capability) && !drv->process && drv->smudge)
cmd = drv->smudge;
if (cmd && *cmd)
return apply_single_file_filter(path, src, len, fd, dst, cmd);
+ else if (drv->process && *drv->process)
+ return apply_multi_file_filter(path, src, len, fd, dst, drv->process, wanted_capability);
return 0;
}
@@ -558,6 +837,9 @@ static int read_convert_config(const char *var, const char *value, void *cb)
if (!strcmp("clean", key))
return git_config_string(&drv->clean, var, value);
+ if (!strcmp("process", key))
+ return git_config_string(&drv->process, var, value);
+
if (!strcmp("required", key)) {
drv->required = git_config_bool(var, value);
return 0;
@@ -919,7 +1201,7 @@ void convert_to_git_filter_fd(const char *path, int fd, struct strbuf *dst,
convert_attrs(&ca, path);
assert(ca.drv);
- assert(ca.drv->clean);
+ assert(ca.drv->clean || ca.drv->process);
if (!apply_filter(path, NULL, 0, fd, dst, ca.drv, CAP_CLEAN))
die("%s: clean filter '%s' failed", path, ca.drv->name);
@@ -944,9 +1226,10 @@ static int convert_to_working_tree_internal(const char *path, const char *src,
}
/*
* CRLF conversion can be skipped if normalizing, unless there
- * is a smudge filter. The filter might expect CRLFs.
+ * is a smudge or process filter (even if the process filter doesn't
+ * support smudge). The filters might expect CRLFs.
*/
- if ((ca.drv && ca.drv->smudge) || !normalizing) {
+ if ((ca.drv && (ca.drv->smudge || ca.drv->process)) || !normalizing) {
ret |= crlf_to_worktree(path, src, len, dst, ca.crlf_action);
if (ret) {
src = dst->buf;
@@ -1407,7 +1690,7 @@ struct stream_filter *get_stream_filter(const char *path, const unsigned char *s
struct stream_filter *filter = NULL;
convert_attrs(&ca, path);
- if (ca.drv && (ca.drv->smudge || ca.drv->clean))
+ if (ca.drv && (ca.drv->process || ca.drv->smudge || ca.drv->clean))
return NULL;
if (ca.crlf_action == CRLF_AUTO || ca.crlf_action == CRLF_AUTO_CRLF)
diff --git a/t/t0021-conversion.sh b/t/t0021-conversion.sh
index dc50938..52b7fe9 100755
--- a/t/t0021-conversion.sh
+++ b/t/t0021-conversion.sh
@@ -4,13 +4,77 @@ test_description='blob conversion via gitattributes'
. ./test-lib.sh
-cat <<EOF >rot13.sh
+TEST_ROOT="$(pwd)"
+
+cat <<EOF >"$TEST_ROOT/rot13.sh"
#!$SHELL_PATH
tr \
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' \
'nopqrstuvwxyzabcdefghijklmNOPQRSTUVWXYZABCDEFGHIJKLM'
EOF
-chmod +x rot13.sh
+chmod +x "$TEST_ROOT/rot13.sh"
+
+generate_random_characters () {
+ LEN=$1
+ NAME=$2
+ test-genrandom some-seed $LEN |
+ perl -pe "s/./chr((ord($&) % 26) + ord('a'))/sge" >"$TEST_ROOT/$NAME"
+}
+
+file_size () {
+ cat "$1" | wc -c | sed "s/^[ ]*//"
+}
+
+filter_git () {
+ rm -f rot13-filter.log &&
+ git "$@" 2>git-stderr.log &&
+ sed '/Waiting for/d' git-stderr.log >git-stderr-clean.log &&
+ test_must_be_empty git-stderr-clean.log &&
+ rm -f git-stderr.log git-stderr-clean.log
+}
+
+# Count unique lines in two files and compare them.
+test_cmp_count () {
+ for FILE in $@
+ do
+ sort $FILE | uniq -c | sed "s/^[ ]*//" >$FILE.tmp
+ cat $FILE.tmp >$FILE
+ done &&
+ test_cmp $@
+}
+
+# Count unique lines except clean invocations in two files and compare
+# them. Clean invocations are not counted because their number can vary.
+# c.f. http://public-inbox.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
+test_cmp_count_except_clean () {
+ for FILE in $@
+ do
+ sort $FILE | uniq -c | sed "s/^[ ]*//" |
+ sed "s/^\([0-9]\) IN: clean/x IN: clean/" >$FILE.tmp
+ cat $FILE.tmp >$FILE
+ done &&
+ test_cmp $@
+}
+
+# Compare two files but exclude clean invocations because they can vary.
+# c.f. http://public-inbox.org/git/xmqqshv18i8i.fsf@gitster.mtv.corp.google.com/
+test_cmp_exclude_clean () {
+ for FILE in $@
+ do
+ grep -v "IN: clean" $FILE >$FILE.tmp
+ cat $FILE.tmp >$FILE
+ done &&
+ test_cmp $@
+}
+
+# Check that the contents of two files are equal and that their rot13 version
+# is equal to the committed content.
+test_cmp_committed_rot13 () {
+ test_cmp "$1" "$2" &&
+ "$TEST_ROOT/rot13.sh" <"$1" >expected &&
+ git cat-file blob :"$2" >actual &&
+ test_cmp expected actual
+}
test_expect_success setup '
git config filter.rot13.smudge ./rot13.sh &&
@@ -31,7 +95,10 @@ test_expect_success setup '
cat test >test.i &&
git add test test.t test.i &&
rm -f test test.t test.i &&
- git checkout -- test test.t test.i
+ git checkout -- test test.t test.i &&
+
+ echo "content-test2" >test2.o &&
+ echo "content-test3 - filename with special characters" >"test3 '\''sq'\'',\$x.o"
'
script='s/^\$Id: \([0-9a-f]*\) \$/\1/p'
@@ -279,4 +346,378 @@ test_expect_success 'diff does not reuse worktree files that need cleaning' '
test_line_count = 0 count
'
+test_expect_success PERL 'required process filter should filter data' '
+ test_config_global filter.protocol.process "$TEST_DIRECTORY/t0021/rot13-filter.pl clean smudge" &&
+ test_config_global filter.protocol.required true &&
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ echo "git-stderr.log" >.gitignore &&
+ echo "*.r filter=protocol" >.gitattributes &&
+ git add . &&
+ git commit . -m "test commit 1" &&
+ git branch empty-branch &&
+
+ cp "$TEST_ROOT/test.o" test.r &&
+ cp "$TEST_ROOT/test2.o" test2.r &&
+ mkdir testsubdir &&
+ cp "$TEST_ROOT/test3 '\''sq'\'',\$x.o" "testsubdir/test3 '\''sq'\'',\$x.r" &&
+ >test4-empty.r &&
+
+ S=$(file_size test.r) &&
+ S2=$(file_size test2.r) &&
+ S3=$(file_size "testsubdir/test3 '\''sq'\'',\$x.r") &&
+
+ filter_git add . &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: clean test.r $S [OK] -- OUT: $S . [OK]
+ IN: clean test2.r $S2 [OK] -- OUT: $S2 . [OK]
+ IN: clean test4-empty.r 0 [OK] -- OUT: 0 [OK]
+ IN: clean testsubdir/test3 '\''sq'\'',\$x.r $S3 [OK] -- OUT: $S3 . [OK]
+ STOP
+ EOF
+ test_cmp_count expected.log rot13-filter.log &&
+
+ filter_git commit . -m "test commit 2" &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: clean test.r $S [OK] -- OUT: $S . [OK]
+ IN: clean test2.r $S2 [OK] -- OUT: $S2 . [OK]
+ IN: clean test4-empty.r 0 [OK] -- OUT: 0 [OK]
+ IN: clean testsubdir/test3 '\''sq'\'',\$x.r $S3 [OK] -- OUT: $S3 . [OK]
+ IN: clean test.r $S [OK] -- OUT: $S . [OK]
+ IN: clean test2.r $S2 [OK] -- OUT: $S2 . [OK]
+ IN: clean test4-empty.r 0 [OK] -- OUT: 0 [OK]
+ IN: clean testsubdir/test3 '\''sq'\'',\$x.r $S3 [OK] -- OUT: $S3 . [OK]
+ STOP
+ EOF
+ test_cmp_count_except_clean expected.log rot13-filter.log &&
+
+ rm -f test2.r "testsubdir/test3 '\''sq'\'',\$x.r" &&
+
+ filter_git checkout --quiet --no-progress . &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
+ IN: smudge testsubdir/test3 '\''sq'\'',\$x.r $S3 [OK] -- OUT: $S3 . [OK]
+ STOP
+ EOF
+ test_cmp_exclude_clean expected.log rot13-filter.log &&
+
+ filter_git checkout --quiet --no-progress empty-branch &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: clean test.r $S [OK] -- OUT: $S . [OK]
+ STOP
+ EOF
+ test_cmp_exclude_clean expected.log rot13-filter.log &&
+
+ filter_git checkout --quiet --no-progress master &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: smudge test.r $S [OK] -- OUT: $S . [OK]
+ IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
+ IN: smudge test4-empty.r 0 [OK] -- OUT: 0 [OK]
+ IN: smudge testsubdir/test3 '\''sq'\'',\$x.r $S3 [OK] -- OUT: $S3 . [OK]
+ STOP
+ EOF
+ test_cmp_exclude_clean expected.log rot13-filter.log &&
+
+ test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
+ test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&
+ test_cmp_committed_rot13 "$TEST_ROOT/test3 '\''sq'\'',\$x.o" "testsubdir/test3 '\''sq'\'',\$x.r"
+ )
+'
+
+test_expect_success PERL 'required process filter takes precedence' '
+ test_config_global filter.protocol.clean false &&
+ test_config_global filter.protocol.process "$TEST_DIRECTORY/t0021/rot13-filter.pl clean" &&
+ test_config_global filter.protocol.required true &&
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ echo "*.r filter=protocol" >.gitattributes &&
+ cp "$TEST_ROOT/test.o" test.r &&
+ S=$(file_size test.r) &&
+
+ # Check that the process filter is invoked here
+ filter_git add . &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: clean test.r $S [OK] -- OUT: $S . [OK]
+ STOP
+ EOF
+ test_cmp_count expected.log rot13-filter.log
+ )
+'
+
+test_expect_success PERL 'required process filter should be used only for "clean" operation only' '
+ test_config_global filter.protocol.process "$TEST_DIRECTORY/t0021/rot13-filter.pl clean" &&
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ echo "*.r filter=protocol" >.gitattributes &&
+ cp "$TEST_ROOT/test.o" test.r &&
+ S=$(file_size test.r) &&
+
+ filter_git add . &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: clean test.r $S [OK] -- OUT: $S . [OK]
+ STOP
+ EOF
+ test_cmp_count expected.log rot13-filter.log &&
+
+ rm test.r &&
+
+ filter_git checkout --quiet --no-progress . &&
+ # If the filter would be used for "smudge", too, we would see
+ # "IN: smudge test.r 57 [OK] -- OUT: 57 . [OK]" here
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ STOP
+ EOF
+ test_cmp_exclude_clean expected.log rot13-filter.log
+ )
+'
+
+test_expect_success PERL 'required process filter should process multiple packets' '
+ test_config_global filter.protocol.process "$TEST_DIRECTORY/t0021/rot13-filter.pl clean smudge" &&
+ test_config_global filter.protocol.required true &&
+
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ # Generate data requiring 1, 2, 3 packets
+ S=65516 && # PKTLINE_DATA_MAXLEN -> Maximal size of a packet
+ generate_random_characters $(($S )) 1pkt_1__.file &&
+ generate_random_characters $(($S +1)) 2pkt_1+1.file &&
+ generate_random_characters $(($S*2-1)) 2pkt_2-1.file &&
+ generate_random_characters $(($S*2 )) 2pkt_2__.file &&
+ generate_random_characters $(($S*2+1)) 3pkt_2+1.file &&
+
+ for FILE in "$TEST_ROOT"/*.file
+ do
+ cp "$FILE" . &&
+ "$TEST_ROOT/rot13.sh" <"$FILE" >"$FILE.rot13"
+ done &&
+
+ echo "*.file filter=protocol" >.gitattributes &&
+ filter_git add *.file .gitattributes &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: clean 1pkt_1__.file $(($S )) [OK] -- OUT: $(($S )) . [OK]
+ IN: clean 2pkt_1+1.file $(($S +1)) [OK] -- OUT: $(($S +1)) .. [OK]
+ IN: clean 2pkt_2-1.file $(($S*2-1)) [OK] -- OUT: $(($S*2-1)) .. [OK]
+ IN: clean 2pkt_2__.file $(($S*2 )) [OK] -- OUT: $(($S*2 )) .. [OK]
+ IN: clean 3pkt_2+1.file $(($S*2+1)) [OK] -- OUT: $(($S*2+1)) ... [OK]
+ STOP
+ EOF
+ test_cmp_count expected.log rot13-filter.log &&
+
+ rm -f *.file &&
+
+ filter_git checkout --quiet --no-progress -- *.file &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: smudge 1pkt_1__.file $(($S )) [OK] -- OUT: $(($S )) . [OK]
+ IN: smudge 2pkt_1+1.file $(($S +1)) [OK] -- OUT: $(($S +1)) .. [OK]
+ IN: smudge 2pkt_2-1.file $(($S*2-1)) [OK] -- OUT: $(($S*2-1)) .. [OK]
+ IN: smudge 2pkt_2__.file $(($S*2 )) [OK] -- OUT: $(($S*2 )) .. [OK]
+ IN: smudge 3pkt_2+1.file $(($S*2+1)) [OK] -- OUT: $(($S*2+1)) ... [OK]
+ STOP
+ EOF
+ test_cmp_exclude_clean expected.log rot13-filter.log &&
+
+ for FILE in *.file
+ do
+ test_cmp_committed_rot13 "$TEST_ROOT/$FILE" $FILE
+ done
+ )
+'
+
+test_expect_success PERL 'required process filter with clean error should fail' '
+ test_config_global filter.protocol.process "$TEST_DIRECTORY/t0021/rot13-filter.pl clean smudge" &&
+ test_config_global filter.protocol.required true &&
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ echo "*.r filter=protocol" >.gitattributes &&
+
+ cp "$TEST_ROOT/test.o" test.r &&
+ echo "this is going to fail" >clean-write-fail.r &&
+ echo "content-test3-subdir" >test3.r &&
+
+ test_must_fail git add .
+ )
+'
+
+test_expect_success PERL 'process filter should restart after unexpected write failure' '
+ test_config_global filter.protocol.process "$TEST_DIRECTORY/t0021/rot13-filter.pl clean smudge" &&
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ echo "*.r filter=protocol" >.gitattributes &&
+
+ cp "$TEST_ROOT/test.o" test.r &&
+ cp "$TEST_ROOT/test2.o" test2.r &&
+ echo "this is going to fail" >smudge-write-fail.o &&
+ cp smudge-write-fail.o smudge-write-fail.r &&
+
+ S=$(file_size test.r) &&
+ S2=$(file_size test2.r) &&
+ SF=$(file_size smudge-write-fail.r) &&
+
+ git add . &&
+ rm -f *.r &&
+
+ rm -f rot13-filter.log &&
+ git checkout --quiet --no-progress . 2>git-stderr.log &&
+
+ grep "smudge write error at" git-stderr.log &&
+ grep "error: external filter" git-stderr.log &&
+
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: smudge smudge-write-fail.r $SF [OK] -- OUT: $SF [WRITE FAIL]
+ START
+ init handshake complete
+ IN: smudge test.r $S [OK] -- OUT: $S . [OK]
+ IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
+ STOP
+ EOF
+ test_cmp_exclude_clean expected.log rot13-filter.log &&
+
+ test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
+ test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&
+
+ # Smudge failed
+ ! test_cmp smudge-write-fail.o smudge-write-fail.r &&
+ "$TEST_ROOT/rot13.sh" <smudge-write-fail.o >expected &&
+ git cat-file blob :smudge-write-fail.r >actual &&
+ test_cmp expected actual
+ )
+'
+
+test_expect_success PERL 'process filter should not be restarted if it signals an error' '
+ test_config_global filter.protocol.process "$TEST_DIRECTORY/t0021/rot13-filter.pl clean smudge" &&
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ echo "*.r filter=protocol" >.gitattributes &&
+
+ cp "$TEST_ROOT/test.o" test.r &&
+ cp "$TEST_ROOT/test2.o" test2.r &&
+ echo "this will cause an error" >error.o &&
+ cp error.o error.r &&
+
+ S=$(file_size test.r) &&
+ S2=$(file_size test2.r) &&
+ SE=$(file_size error.r) &&
+
+ git add . &&
+ rm -f *.r &&
+
+ filter_git checkout --quiet --no-progress . &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: smudge error.r $SE [OK] -- OUT: 0 [ERROR]
+ IN: smudge test.r $S [OK] -- OUT: $S . [OK]
+ IN: smudge test2.r $S2 [OK] -- OUT: $S2 . [OK]
+ STOP
+ EOF
+ test_cmp_exclude_clean expected.log rot13-filter.log &&
+
+ test_cmp_committed_rot13 "$TEST_ROOT/test.o" test.r &&
+ test_cmp_committed_rot13 "$TEST_ROOT/test2.o" test2.r &&
+ test_cmp error.o error.r
+ )
+'
+
+test_expect_success PERL 'process filter signals abort once to abort processing of all future files' '
+ test_config_global filter.protocol.process "$TEST_DIRECTORY/t0021/rot13-filter.pl clean smudge" &&
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ echo "*.r filter=protocol" >.gitattributes &&
+
+ cp "$TEST_ROOT/test.o" test.r &&
+ cp "$TEST_ROOT/test2.o" test2.r &&
+ echo "error this blob and all future blobs" >abort.o &&
+ cp abort.o abort.r &&
+
+ SA=$(file_size abort.r) &&
+
+ git add . &&
+ rm -f *.r &&
+
+ filter_git checkout --quiet --no-progress . &&
+ cat >expected.log <<-EOF &&
+ START
+ init handshake complete
+ IN: smudge abort.r $SA [OK] -- OUT: 0 [ABORT]
+ STOP
+ EOF
+ test_cmp_exclude_clean expected.log rot13-filter.log &&
+
+ test_cmp "$TEST_ROOT/test.o" test.r &&
+ test_cmp "$TEST_ROOT/test2.o" test2.r &&
+ test_cmp abort.o abort.r
+ )
+'
+
+test_expect_success PERL 'invalid process filter must fail (and not hang!)' '
+ test_config_global filter.protocol.process cat &&
+ test_config_global filter.protocol.required true &&
+ rm -rf repo &&
+ mkdir repo &&
+ (
+ cd repo &&
+ git init &&
+
+ echo "*.r filter=protocol" >.gitattributes &&
+
+ cp "$TEST_ROOT/test.o" test.r &&
+ test_must_fail git add . 2>git-stderr.log &&
+ grep "does not support filter protocol version" git-stderr.log
+ )
+'
+
test_done
diff --git a/t/t0021/rot13-filter.pl b/t/t0021/rot13-filter.pl
new file mode 100755
index 0000000..1a6959c
--- /dev/null
+++ b/t/t0021/rot13-filter.pl
@@ -0,0 +1,191 @@
+#!/usr/bin/perl
+#
+# Example implementation for the Git filter protocol version 2
+# See Documentation/gitattributes.txt, section "Filter Protocol"
+#
+# The script takes the list of supported protocol capabilities as
+# arguments ("clean", "smudge", etc).
+#
+# This implementation supports special test cases:
+# (1) If data with the pathname "clean-write-fail.r" is processed with
+# a "clean" operation then the write operation will die.
+# (2) If data with the pathname "smudge-write-fail.r" is processed with
+# a "smudge" operation then the write operation will die.
+# (3) If data with the pathname "error.r" is processed with any
+# operation then the filter signals that it cannot or does not want
+# to process the file.
+# (4) If data with the pathname "abort.r" is processed with any
+# operation then the filter signals that it cannot or does not want
+# to process the file and any file after that is processed with the
+# same command.
+#
+
+use strict;
+use warnings;
+
+my $MAX_PACKET_CONTENT_SIZE = 65516;
+my @capabilities = @ARGV;
+
+open my $debug, ">>", "rot13-filter.log" or die "cannot open log file: $!";
+
+sub rot13 {
+ my $str = shift;
+ $str =~ y/A-Za-z/N-ZA-Mn-za-m/;
+ return $str;
+}
+
+sub packet_bin_read {
+ my $buffer;
+ my $bytes_read = read STDIN, $buffer, 4;
+ if ( $bytes_read == 0 ) {
+ # EOF - Git stopped talking to us!
+ print $debug "STOP\n";
+ exit();
+ }
+ elsif ( $bytes_read != 4 ) {
+ die "invalid packet: '$buffer'";
+ }
+ my $pkt_size = hex($buffer);
+ if ( $pkt_size == 0 ) {
+ return ( 1, "" );
+ }
+ elsif ( $pkt_size > 4 ) {
+ my $content_size = $pkt_size - 4;
+ $bytes_read = read STDIN, $buffer, $content_size;
+ if ( $bytes_read != $content_size ) {
+ die "invalid packet ($content_size bytes expected; $bytes_read bytes read)";
+ }
+ return ( 0, $buffer );
+ }
+ else {
+ die "invalid packet size: $pkt_size";
+ }
+}
+
+sub packet_txt_read {
+ my ( $res, $buf ) = packet_bin_read();
+ unless ( $buf =~ s/\n$// ) {
+ die "A non-binary line MUST be terminated by an LF.";
+ }
+ return ( $res, $buf );
+}
+
+sub packet_bin_write {
+ my $buf = shift;
+ print STDOUT sprintf( "%04x", length($buf) + 4 );
+ print STDOUT $buf;
+ STDOUT->flush();
+}
+
+sub packet_txt_write {
+ packet_bin_write( $_[0] . "\n" );
+}
+
+sub packet_flush {
+ print STDOUT sprintf( "%04x", 0 );
+ STDOUT->flush();
+}
+
+print $debug "START\n";
+$debug->flush();
+
+( packet_txt_read() eq ( 0, "git-filter-client" ) ) || die "bad initialize";
+( packet_txt_read() eq ( 0, "version=2" ) ) || die "bad version";
+( packet_bin_read() eq ( 1, "" ) ) || die "bad version end";
+
+packet_txt_write("git-filter-server");
+packet_txt_write("version=2");
+
+( packet_txt_read() eq ( 0, "clean=true" ) ) || die "bad capability";
+( packet_txt_read() eq ( 0, "smudge=true" ) ) || die "bad capability";
+( packet_bin_read() eq ( 1, "" ) ) || die "bad capability end";
+
+foreach (@capabilities) {
+ packet_txt_write( $_ . "=true" );
+}
+packet_flush();
+print $debug "init handshake complete\n";
+$debug->flush();
+
+while (1) {
+ my ($command) = packet_txt_read() =~ /^command=([^=]+)$/;
+ print $debug "IN: $command";
+ $debug->flush();
+
+ my ($pathname) = packet_txt_read() =~ /^pathname=([^=]+)$/;
+ print $debug " $pathname";
+ $debug->flush();
+
+ # Flush
+ packet_bin_read();
+
+ my $input = "";
+ {
+ binmode(STDIN);
+ my $buffer;
+ my $done = 0;
+ while ( !$done ) {
+ ( $done, $buffer ) = packet_bin_read();
+ $input .= $buffer;
+ }
+ print $debug " " . length($input) . " [OK] -- ";
+ $debug->flush();
+ }
+
+ my $output;
+ if ( $pathname eq "error.r" or $pathname eq "abort.r" ) {
+ $output = "";
+ }
+ elsif ( $command eq "clean" and grep( /^clean$/, @capabilities ) ) {
+ $output = rot13($input);
+ }
+ elsif ( $command eq "smudge" and grep( /^smudge$/, @capabilities ) ) {
+ $output = rot13($input);
+ }
+ else {
+ die "bad command '$command'";
+ }
+
+ print $debug "OUT: " . length($output) . " ";
+ $debug->flush();
+
+ if ( $pathname eq "error.r" ) {
+ print $debug "[ERROR]\n";
+ $debug->flush();
+ packet_txt_write("status=error");
+ packet_flush();
+ }
+ elsif ( $pathname eq "abort.r" ) {
+ print $debug "[ABORT]\n";
+ $debug->flush();
+ packet_txt_write("status=abort");
+ packet_flush();
+ }
+ else {
+ packet_txt_write("status=success");
+ packet_flush();
+
+ if ( $pathname eq "${command}-write-fail.r" ) {
+ print $debug "[WRITE FAIL]\n";
+ $debug->flush();
+ die "${command} write error";
+ }
+
+ while ( length($output) > 0 ) {
+ my $packet = substr( $output, 0, $MAX_PACKET_CONTENT_SIZE );
+ packet_bin_write($packet);
+ # dots represent the number of packets
+ print $debug ".";
+ if ( length($output) > $MAX_PACKET_CONTENT_SIZE ) {
+ $output = substr( $output, $MAX_PACKET_CONTENT_SIZE );
+ }
+ else {
+ $output = "";
+ }
+ }
+ packet_flush();
+ print $debug " [OK]\n";
+ $debug->flush();
+ packet_flush();
+ }
+}
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* [PATCH v9 14/14] contrib/long-running-filter: add long running filter example
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (12 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 13/14] convert: add " larsxschneider
@ 2016-10-04 12:59 ` larsxschneider
2016-10-05 22:31 ` [PATCH v9 00/14] Git filter protocol Jakub Narębski
14 siblings, 0 replies; 28+ messages in thread
From: larsxschneider @ 2016-10-04 12:59 UTC (permalink / raw)
To: git; +Cc: ramsay, jnareb, gitster, j6t, tboegi, peff, mlbright,
Lars Schneider
From: Lars Schneider <larsxschneider@gmail.com>
Add a simple pass-thru filter as example implementation for the Git
filter protocol version 2. See Documentation/gitattributes.txt, section
"Filter Protocol" for more info.
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
---
Documentation/gitattributes.txt | 4 +-
contrib/long-running-filter/example.pl | 127 +++++++++++++++++++++++++++++++++
2 files changed, 130 insertions(+), 1 deletion(-)
create mode 100755 contrib/long-running-filter/example.pl
diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 5868f00..a182ef2 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -514,7 +514,9 @@ the next "key=value" list containing a command. Git will close
the command pipe on exit. The filter is expected to detect EOF
and exit gracefully on its own.
-If you develop your own long running filter
+A long running filter demo implementation can be found in
+`contrib/long-running-filter/example.pl` located in the Git
+core repository. If you develop your own long running filter
process then the `GIT_TRACE_PACKET` environment variables can be
very helpful for debugging (see linkgit:git[1]).
diff --git a/contrib/long-running-filter/example.pl b/contrib/long-running-filter/example.pl
new file mode 100755
index 0000000..f4102d2
--- /dev/null
+++ b/contrib/long-running-filter/example.pl
@@ -0,0 +1,127 @@
+#!/usr/bin/perl
+#
+# Example implementation for the Git filter protocol version 2
+# See Documentation/gitattributes.txt, section "Filter Protocol"
+#
+# Please note, this pass-thru filter is a minimal skeleton. No proper
+# error handling was implemented.
+#
+
+use strict;
+use warnings;
+
+my $MAX_PACKET_CONTENT_SIZE = 65516;
+
+sub packet_bin_read {
+ my $buffer;
+ my $bytes_read = read STDIN, $buffer, 4;
+ if ( $bytes_read == 0 ) {
+
+ # EOF - Git stopped talking to us!
+ exit();
+ }
+ elsif ( $bytes_read != 4 ) {
+ die "invalid packet: '$buffer'";
+ }
+ my $pkt_size = hex($buffer);
+ if ( $pkt_size == 0 ) {
+ return ( 1, "" );
+ }
+ elsif ( $pkt_size > 4 ) {
+ my $content_size = $pkt_size - 4;
+ $bytes_read = read STDIN, $buffer, $content_size;
+ if ( $bytes_read != $content_size ) {
+ die "invalid packet ($content_size bytes expected; $bytes_read bytes read)";
+ }
+ return ( 0, $buffer );
+ }
+ else {
+ die "invalid packet size: $pkt_size";
+ }
+}
+
+sub packet_txt_read {
+ my ( $res, $buf ) = packet_bin_read();
+ unless ( $buf =~ s/\n$// ) {
+ die "A non-binary line MUST be terminated by an LF.";
+ }
+ return ( $res, $buf );
+}
+
+sub packet_bin_write {
+ my $buf = shift;
+ print STDOUT sprintf( "%04x", length($buf) + 4 );
+ print STDOUT $buf;
+ STDOUT->flush();
+}
+
+sub packet_txt_write {
+ packet_bin_write( $_[0] . "\n" );
+}
+
+sub packet_flush {
+ print STDOUT sprintf( "%04x", 0 );
+ STDOUT->flush();
+}
+
+( packet_txt_read() eq ( 0, "git-filter-client" ) ) || die "bad initialize";
+( packet_txt_read() eq ( 0, "version=2" ) ) || die "bad version";
+( packet_bin_read() eq ( 1, "" ) ) || die "bad version end";
+
+packet_txt_write("git-filter-server");
+packet_txt_write("version=2");
+
+( packet_txt_read() eq ( 0, "clean=true" ) ) || die "bad capability";
+( packet_txt_read() eq ( 0, "smudge=true" ) ) || die "bad capability";
+( packet_bin_read() eq ( 1, "" ) ) || die "bad capability end";
+
+packet_txt_write("clean=true");
+packet_txt_write("smudge=true");
+packet_flush();
+
+while (1) {
+ my ($command) = packet_txt_read() =~ /^command=([^=]+)$/;
+ my ($pathname) = packet_txt_read() =~ /^pathname=([^=]+)$/;
+
+ packet_bin_read();
+
+ my $input = "";
+ {
+ binmode(STDIN);
+ my $buffer;
+ my $done = 0;
+ while ( !$done ) {
+ ( $done, $buffer ) = packet_bin_read();
+ $input .= $buffer;
+ }
+ }
+
+ my $output;
+ if ( $command eq "clean" ) {
+ ### Perform clean here ###
+ $output = $input;
+ }
+ elsif ( $command eq "smudge" ) {
+ ### Perform smudge here ###
+ $output = $input;
+ }
+ else {
+ die "bad command '$command'";
+ }
+
+ packet_txt_write("status=success");
+ packet_flush();
+ while ( length($output) > 0 ) {
+ my $packet = substr( $output, 0, $MAX_PACKET_CONTENT_SIZE );
+ packet_bin_write($packet);
+ if ( length($output) > $MAX_PACKET_CONTENT_SIZE ) {
+ $output = substr( $output, $MAX_PACKET_CONTENT_SIZE );
+ }
+ else {
+ $output = "";
+ }
+ }
+ packet_flush(); # flush content!
+ packet_flush(); # empty list, keep "status=success" unchanged!
+
+}
--
2.10.0
^ permalink raw reply related [flat|nested] 28+ messages in thread* Re: [PATCH v9 00/14] Git filter protocol
2016-10-04 12:59 [PATCH v9 00/14] Git filter protocol larsxschneider
` (13 preceding siblings ...)
2016-10-04 12:59 ` [PATCH v9 14/14] contrib/long-running-filter: add long running filter example larsxschneider
@ 2016-10-05 22:31 ` Jakub Narębski
14 siblings, 0 replies; 28+ messages in thread
From: Jakub Narębski @ 2016-10-05 22:31 UTC (permalink / raw)
To: larsxschneider, git; +Cc: ramsay, gitster, j6t, tboegi, peff, mlbright
W dniu 04.10.2016 o 14:59, larsxschneider@gmail.com pisze:
> From: Lars Schneider <larsxschneider@gmail.com>
>
> The goal of this series is to avoid launching a new clean/smudge filter
> process for each file that is filtered.
>
> A short summary about v1 to v5 can be found here:
> https://git.github.io/rev_news/2016/08/17/edition-18/
>
> This series is also published on web:
> https://github.com/larsxschneider/git/pull/13
>
> Patches 1 and 2 are cleanups and not strictly necessary for the series.
> Patches 3 to 12 are required preparation. Patch 13 is the main patch.
> Patch 14 adds an example how to use the Git filter protocol in contrib.
>
> Thanks a lot to
> Ramsay, Jakub, Junio, Johannes, Torsten, and Peff
> for very helpful reviews,
> Lars
I'll try to review it before the end of the week.
--
Jakub Narębski
^ permalink raw reply [flat|nested] 28+ messages in thread