[RFC PATCH 3/6] refs.c: Teach `read_ref_at()` to accept `GET_OID_GENTLY` flag

[Paul-Sebastian Ungureanu <ungureanupaulsebastian@xxxxxxxxx>]

This commit introduces a way to call `read_ref_at()` without
exiting on failure.

Signed-off-by: Paul-Sebastian Ungureanu <ungureanupaulsebastian@xxxxxxxxx>
---
 refs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/refs.c b/refs.c
index 0eb379f93..4a470158e 100644
--- a/refs.c
+++ b/refs.c
@@ -932,6 +932,8 @@ int read_ref_at(const char *refname, unsigned int flags, timestamp_t at_time, in
 	for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb);
 
 	if (!cb.reccnt) {
+		if (flags & GET_OID_GENTLY)
+			return -1;
 		if (flags & GET_OID_QUIETLY)
 			exit(128);
 		else
-- 
2.18.0.rc2.184.ga79db55c2.dirty