send-pack: fix inconsistent porcelain output

The porcelain output of a failed `git-push` command is inconsistent for
different protocols.  For example, the following `git-push` command
may fail due to the failure of the `pre-receive` hook.

    git push --porcelain origin HEAD:refs/heads/master

For SSH protocol, the porcelain output does not end with a "Done"
message:

	To <URL/of/upstream.git>
	!  HEAD:refs/heads/master  [remote rejected] (pre-receive hook declined)

While for HTTP protocol, the porcelain output does end with a "Done"
message:

	To <URL/of/upstream.git>
	!  HEAD:refs/heads/master  [remote rejected] (pre-receive hook declined)
	Done

The following code at the end of function `send_pack()` indicates that
`send_pack()` should not return an error if some references are rejected
in porcelain mode.

    int send_pack(...)
        ... ...

        if (args->porcelain)
            return 0;

        for (ref = remote_refs; ref; ref = ref->next) {
            switch (ref->status) {
            case REF_STATUS_NONE:
            case REF_STATUS_UPTODATE:
            case REF_STATUS_OK:
                break;
            default:
                return -1;
            }
        }
        return 0;
    }

So if atomic push failed, must check the porcelain mode before return
an error.  And `receive_status()` should not return an error for a
failed updated reference, because `send_pack()` will check them instead.

Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/send-pack.c b/send-pack.c
index 0407841ae8..1835cd5582 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -190,10 +190,8 @@ static int receive_status(struct packet_reader *reader, struct ref *refs)
 
 		if (reader->line[0] == 'o' && reader->line[1] == 'k')
 			hint->status = REF_STATUS_OK;
-		else {
+		else
 			hint->status = REF_STATUS_REMOTE_REJECT;
-			ret = -1;
-		}
 		hint->remote_status = xstrdup_or_null(msg);
 		/* start our next search from the next ref */
 		hint = hint->next;
@@ -489,7 +487,8 @@ int send_pack(struct send_pack_args *args,
 			if (use_atomic) {
 				strbuf_release(&req_buf);
 				strbuf_release(&cap_buf);
-				return atomic_push_failure(args, remote_refs, ref);
+				atomic_push_failure(args, remote_refs, ref);
+				return args->porcelain ? 0 : -1;
 			}
 			/* else fallthrough */
 		default: