In the case where a non-existent oid is given as the <src> for a
refspec and the destination is unqualified, we end up hitting the BUG in
show_push_unqualified_ref_name_error().

This is because before hitting this advise message, the <src> is passed
through repo_get_oid() which, upon receiving a fully qualified oid,
doesn't actually check the existence of the object and just returns
found. This means that it's actually possible for the
odb_read_object_info() call to return not found under normal usage and
thus, it's not actually a bug.

Replace the BUG() with an advise() displaying a helpful message about
the oid possibly not existing.

Signed-off-by: Denton Liu <redacted>
---
 remote.c              | 5 +++--
 t/t5516-fetch-push.sh | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/remote.c b/remote.c
index e965f022f1..9fb76049d2 100644
--- a/remote.c
+++ b/remote.c

@@ -1218,8 +1218,9 @@ static void show_push_unqualified_ref_name_error(const char *dst_value,
 			 "'%s:refs/tags/%s'?"),
 		       matched_src_name, dst_value);
 	} else {
-		BUG("'%s' should be commit/tag/tree/blob, is '%d'",
-		    matched_src_name, type);
+		advise(_("The <src> part of the refspec is an oid that doesn't exist.\n"
+			 "Please ensure that the oid '%s' is correct."),
+		       matched_src_name);
 	}
 }
 

diff --git a/t/t5516-fetch-push.sh b/t/t5516-fetch-push.sh
index c2fcfeca92..e064ea7433 100755
--- a/t/t5516-fetch-push.sh
+++ b/t/t5516-fetch-push.sh

@@ -509,7 +509,7 @@ test_expect_success 'push ref expression with non-existent, incomplete dest' '
 
 '
 
-test_expect_failure 'push ref expression with non-existent oid src' '
+test_expect_success 'push ref expression with non-existent oid src' '
 
 	mk_test testrepo &&
 	test_must_fail git push testrepo $(test_oid 001):branch

-- 
2.50.1