refs: make rev-parse --quiet actually quiet

When a reflog is deleted, e.g. when "git stash" clears its stashes,
"git rev-parse --verify --quiet" dies:

	fatal: Log for refs/stash is empty.

The reason is that the get_sha1() code path does not allow us
to suppress this message.

Pass the flags bitfield through get_sha1_with_context() so that
read_ref_at() can suppress the message.

Use get_sha1_with_context1() instead of get_sha1() in rev-parse
so that the --quiet flag is honored.

Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/refs.c b/refs.c
index 2ce5d69..9e405f9 100644
--- a/refs.c
+++ b/refs.c
@@ -3108,7 +3108,7 @@ static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1,
 	return 1;
 }
 
-int read_ref_at(const char *refname, unsigned long at_time, int cnt,
+int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt,
 		unsigned char *sha1, char **msg,
 		unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
 {
@@ -3126,8 +3126,12 @@ int read_ref_at(const char *refname, unsigned long at_time, int cnt,
 
 	for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
 
-	if (!cb.reccnt)
-		die("Log for %s is empty.", refname);
+	if (!cb.reccnt) {
+		if (flags & GET_SHA1_QUIETLY)
+			exit(128);
+		else
+			die("Log for %s is empty.", refname);
+	}
 	if (cb.found_it)
 		return 0;