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common-main: call restore_sigpipe_to_default()

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This is another safety/sanity setup that should be in force
everywhere, but which we only applied in git.c. This did
catch most cases, since even external commands are typically
run via "git ..." (and the restoration applies to
sub-processes, too). But there were cases we missed, such as
somebody calling git-upload-pack directly via ssh, or
scripts which use dashed external commands directly.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2016-07-01 02:06:35 -04:00 committed by Junio C Hamano
parent 57f5d52a94
commit 12e0437f23
2 changed files with 23 additions and 23 deletions
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23
common-main.c
View File

@ -1,6 +1,27 @@
#include "cache.h"
#include "exec_cmd.h"
/*
* Many parts of Git have subprograms communicate via pipe, expect the
* upstream of a pipe to die with SIGPIPE when the downstream of a
* pipe does not need to read all that is written. Some third-party
* programs that ignore or block SIGPIPE for their own reason forget
* to restore SIGPIPE handling to the default before spawning Git and
* break this carefully orchestrated machinery.
*
* Restore the way SIGPIPE is handled to default, which is what we
* expect.
*/
static void restore_sigpipe_to_default(void)
{
sigset_t unblock;
sigemptyset(&unblock);
sigaddset(&unblock, SIGPIPE);
sigprocmask(SIG_UNBLOCK, &unblock, NULL);
signal(SIGPIPE, SIG_DFL);
}
int main(int argc, char **av)
{
/*
@ -18,5 +39,7 @@ int main(int argc, char **av)
argv[0] = git_extract_argv0_path(argv[0]);
restore_sigpipe_to_default();
return cmd_main(argc, argv);
}

23
git.c
View File

@ -609,27 +609,6 @@ static int run_argv(int *argcp, const char ***argv)
return done_alias;
}
/*
* Many parts of Git have subprograms communicate via pipe, expect the
* upstream of a pipe to die with SIGPIPE when the downstream of a
* pipe does not need to read all that is written. Some third-party
* programs that ignore or block SIGPIPE for their own reason forget
* to restore SIGPIPE handling to the default before spawning Git and
* break this carefully orchestrated machinery.
*
* Restore the way SIGPIPE is handled to default, which is what we
* expect.
*/
static void restore_sigpipe_to_default(void)
{
sigset_t unblock;
sigemptyset(&unblock);
sigaddset(&unblock, SIGPIPE);
sigprocmask(SIG_UNBLOCK, &unblock, NULL);
signal(SIGPIPE, SIG_DFL);
}
int cmd_main(int argc, const char **argv)
{
const char *cmd;
@ -639,8 +618,6 @@ int cmd_main(int argc, const char **argv)
if (!cmd)
cmd = "git-help";
restore_sigpipe_to_default();
git_setup_gettext();
trace_command_performance(argv);