remote-curl: Fix push status report when all branches fail

The protocol between transport-helper.c and remote-curl requires
remote-curl to always print a blank line after the push command
has run. If the blank line is ommitted, transport-helper kills its
container process (the git push the user started) with exit(128)
and no message indicating a problem, assuming the helper already
printed reasonable error text to the console.

However if the remote rejects all branches with "ng" commands in the
report-status reply, send-pack terminates with non-zero status, and
in turn remote-curl exited with non-zero status before outputting
the blank line after the helper status printed by send-pack. No
error messages reach the user.

This caused users to see the following from git push over HTTP
when the remote side's update hook rejected the branch:

  $ git push http://... master
  Counting objects: 4, done.
  Delta compression using up to 6 threads.
  Compressing objects: 100% (2/2), done.
  Writing objects: 100% (3/3), 301 bytes, done.
  Total 3 (delta 0), reused 0 (delta 0)
  $

Always print a blank line after the send-pack process terminates,
ensuring the helper status report (if it was output) will be
correctly parsed by the calling transport-helper.c. This ensures
the helper doesn't abort before the status report can be shown to
the user.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/remote-curl.c b/remote-curl.c
index 69831e9..f484859 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -797,7 +797,7 @@ static int push(int nr_spec, char **specs)
 static void parse_push(struct strbuf *buf)
 {
 	char **specs = NULL;
-	int alloc_spec = 0, nr_spec = 0, i;
+	int alloc_spec = 0, nr_spec = 0, i, ret;
 
 	do {
 		if (!prefixcmp(buf->buf, "push ")) {
@@ -814,12 +814,13 @@ static void parse_push(struct strbuf *buf)
 			break;
 	} while (1);
 
-	if (push(nr_spec, specs))
-		exit(128); /* error already reported */
-
+	ret = push(nr_spec, specs);
 	printf("\n");
 	fflush(stdout);
 
+	if (ret)
+		exit(128); /* error already reported */
+
  free_specs:
 	for (i = 0; i < nr_spec; i++)
 		free(specs[i]);