connect.c: add a way for git-daemon to pass an error back to client

The current behavior of git-daemon is to simply close the connection on
any error condition. This leaves the client without any information as
to the cause of the failed fetch/push/etc.

This patch allows get_remote_heads to accept a line prefixed with "ERR"
that it can display to the user in an informative fashion. Once clients
can understand this ERR line, git-daemon can be made to properly report
"repository not found", "permission denied", or other errors.

Example

S: ERR No matching repository.
C: fatal: remote error: No matching repository.

Signed-off-by: Tom Preston-Werner <tom@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/connect.c b/connect.c
index 0c50d0a26a493f4505eee16812d14c5d7d1b7392..584e04c217da4ea8943e33c77fea56ce64547ed1 100644 (file)
--- a/connect.c
+++ b/connect.c
@@ -70,6 +70,9 @@ struct ref **get_remote_heads(int in, struct ref **list,
                if (buffer[len-1] == '\n')
                        buffer[--len] = 0;
 
                if (buffer[len-1] == '\n')
                        buffer[--len] = 0;
 

+               if (len > 4 && !prefixcmp(buffer, "ERR "))
+                       die("remote error: %s", buffer + 4);
+

                if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
                        die("protocol error: expected sha/ref, got '%s'", buffer);
                name = buffer + 41;
                if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
                        die("protocol error: expected sha/ref, got '%s'", buffer);
                name = buffer + 41;