Re: [PATCH] allow hooks to ignore their standard input stream
- From
Clemens Buchacher <clemens.buchacher@intel.com>
- Date
- Nov 16, 2015, 08:05 UTC
- Message-ID
- <20151116080558.GA23851@musxeris015.imu.intel.com>
- In-Reply-To
- <20151113232320.GB16173@sigill.intra.peff.net>
Hi Junio,
I believe we have finalized the discussion on this patch. Please apply
On Fri, Nov 13, 2015 at 06:23:20PM -0500, Jeff King wrote:
Show 11 quoted lines
> > > +test_expect_success 'filling pipe buffer does not cause failure' ' > > + git push parent1 "refs/heads/b/*:refs/heads/b/*" && > > + test_cmp expected actual > > +' > > It actually _does_ read all of the input, but I guess is making sure we > call write() in a loop. I don't know if this is even worth keeping. > > Can you think of a good reason that it is checking something > interesting?
No, I also cannot think of a good reason to keep it. Here is the patch with the test above removed.
Best regards, Clemens
--o<-- Since ec7dbd145 (receive-pack: allow hooks to ignore its standard input stream) the pre-receive and post-receive hooks ignore SIGPIPE. Do the same for the remaining hooks pre-push and post-rewrite, which read from standard input. The same arguments for ignoring SIGPIPE apply.
Include test by Jeff King which checks that SIGPIPE does not cause pre-push hook failure. With the use of git update-ref --stdin it is fast enough to be enabled by default.
Signed-off-by: Clemens Buchacher <clemens.buchacher@intel.com> --- builtin/commit.c | 3 +++ t/t5571-pre-push-hook.sh | 33 +++++++++++++++------------------ transport.c | 11 +++++++++-- 3 files changed, 27 insertions(+), 20 deletions(-)
diff --git a/builtin/commit.c b/builtin/commit.c index dca09e2..f2a8b78 100644 --- a/builtin/commit.c +++ b/builtin/commit.c @@ -32,6 +32,7 @@ #include "sequencer.h" #include "notes-utils.h" #include "mailmap.h" +#include "sigchain.h" static const char * const builtin_commit_usage[] = { N_("git commit [<options>] [--] <pathspec>..."), @@ -1537,8 +1538,10 @@ static int run_rewrite_hook(const unsigned char *oldsha1, return code; n = snprintf(buf, sizeof(buf), "%s %s\n", sha1_to_hex(oldsha1), sha1_to_hex(newsha1)); + sigchain_push(SIGPIPE, SIG_IGN); write_in_full(proc.in, buf, n); close(proc.in); + sigchain_pop(SIGPIPE); return finish_command(&proc); } diff --git a/t/t5571-pre-push-hook.sh b/t/t5571-pre-push-hook.sh index 6f9916a..ba975bb 100755 --- a/t/t5571-pre-push-hook.sh +++ b/t/t5571-pre-push-hook.sh @@ -109,23 +109,20 @@ test_expect_success 'push to URL' ' diff expected actual ' -# Test that filling pipe buffers doesn't cause failure -# Too slow to leave enabled for general use -if false -then - printf 'parent1\nrepo1\n' >expected - nr=1000 - while test $nr -lt 2000 - do - nr=$(( $nr + 1 )) - git branch b/$nr $COMMIT3 - echo "refs/heads/b/$nr $COMMIT3 refs/heads/b/$nr $_z40" >>expected - done - - test_expect_success 'push many refs' ' - git push parent1 "refs/heads/b/*:refs/heads/b/*" && - diff expected actual - ' -fi +test_expect_success 'set up many-ref tests' ' + { + nr=1000 + while test $nr -lt 2000 + do + nr=$(( $nr + 1 )) + echo "create refs/heads/b/$nr $COMMIT3" + done + } | git update-ref --stdin +' + +test_expect_success 'sigpipe does not cause pre-push hook failure' ' + echo "exit 0" | write_script "$HOOK" && + git push parent1 "refs/heads/b/*:refs/heads/b/*" +' test_done diff --git a/transport.c b/transport.c index 23b2ed6..e34ab92 100644 --- a/transport.c +++ b/transport.c @@ -15,6 +15,7 @@ #include "submodule.h" #include "string-list.h" #include "sha1-array.h" +#include "sigchain.h" /* rsync support */ @@ -1127,6 +1128,8 @@ static int run_pre_push_hook(struct transport *transport, return -1; } + sigchain_push(SIGPIPE, SIG_IGN); + strbuf_init(&buf, 256); for (r = remote_refs; r; r = r->next) { @@ -1140,8 +1143,10 @@ static int run_pre_push_hook(struct transport *transport, r->peer_ref->name, sha1_to_hex(r->new_sha1), r->name, sha1_to_hex(r->old_sha1)); - if (write_in_full(proc.in, buf.buf, buf.len) != buf.len) { - ret = -1; + if (write_in_full(proc.in, buf.buf, buf.len) < 0) { + /* We do not mind if a hook does not read all refs. */ + if (errno != EPIPE) + ret = -1; break; } } @@ -1152,6 +1157,8 @@ static int run_pre_push_hook(struct transport *transport, if (!ret) ret = x; + sigchain_pop(SIGPIPE); + x = finish_command(&proc); if (!ret) ret = x;
-- 1.9.4