[PATCH/RFC 1/2] send-pack --stateless-rpc: properly close the outgoing channel

[Johannes Sixt <j6t@kdbg.org>]

In the non-stateless-rpc case, the writable end of the channel to the
remote repo is closed by the start_command() call that runs the
pack-objects process (after pack-objects inherited a copy). But in the
--stateless-rpc case, where send-pack takes care of writing data to the
channel, this was missed.

Signed-off-by: Johannes Sixt <j6t@kdbg.org>
---
Am 14.04.2011 23:21, schrieb Junio C Hamano:
> Jeff King <peff@peff.net> writes:
> 
>> I think I am leaning a bit towards (2a). It's simple, and it's not like
>> this is library code with a million unknown callers; fixing it simply
>> and cleanly with a nice commit message is probably sufficient.
> 
> This really sounds like a plan.  Even if we _might_ later want to go to
> 2b. or some other solution, we will know what pattern to grep for.

Here's a 2-patch series that implements this plan. The patches go on top of
38a81b4e (receive-pack: Wrap status reports inside side-band-64k) just like
Jeff's series (jk/maint-push-async-hang).

Warning: This patch is untested. Furthermore, it does not even fix a resource
leak because the fd that is now closed in pack_objects() would be closed
later in cmd_send_pack. However, without closing the fd earlier like this,
a --stateless-rpc invocation could theoretically dead-lock just like a regular
invocation in a NO_PTHREADS build. But I also don't know how to test-drive
send-pack --stateless-rpc to construct such a case. Any hints how to do that
would be appreciated.

-- Hannes

 builtin-send-pack.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/builtin-send-pack.c b/builtin-send-pack.c
index 2478e18..089058b 100644
--- a/builtin-send-pack.c
+++ b/builtin-send-pack.c
@@ -97,6 +97,7 @@ static int pack_objects(int fd, struct ref *refs, struct extra_have_objects *ext
 		free(buf);
 		close(po.out);
 		po.out = -1;
+		close(fd);
 	}
 
 	if (finish_command(&po))
-- 
1.7.5.rc1.97.ge0653