Merge branch 'mh/update-ref-verify'

"git update-ref --stdin"'s verify command did not work well when
<oldvalue>, which is documented as optional, was missing.

* mh/update-ref-verify:
  update-ref: fix "verify" command with missing <oldvalue>
  t1400: add some more tests of "update-ref --stdin"'s verify command

2 files changed, 97 insertions, 9 deletions

diff --git a/builtin/update-ref.c b/builtin/update-ref.c
index 6c9be05128..1993529521 100644
--- a/builtin/update-ref.c
+++ b/builtin/update-ref.c
@@ -282,26 +282,22 @@ static const char *parse_cmd_verify(struct ref_transaction *transaction,
 	char *refname;
 	unsigned char new_sha1[20];
 	unsigned char old_sha1[20];
-	int have_old;
 
 	refname = parse_refname(input, &next);
 	if (!refname)
 		die("verify: missing <ref>");
 
 	if (parse_next_sha1(input, &next, old_sha1, "verify", refname,
-			    PARSE_SHA1_OLD)) {
-		hashclr(new_sha1);
-		have_old = 0;
-	} else {
-		hashcpy(new_sha1, old_sha1);
-		have_old = 1;
-	}
+			    PARSE_SHA1_OLD))
+		hashclr(old_sha1);
+
+	hashcpy(new_sha1, old_sha1);
 
 	if (*next != line_termination)
 		die("verify %s: extra input: %s", refname, next);
 
 	if (ref_transaction_update(transaction, refname, new_sha1, old_sha1,
-				   update_flags, have_old, msg, &err))
+				   update_flags, 1, msg, &err))
 		die("%s", err.buf);
 
 	update_flags = 0;
diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index 7b4707b776..6805b9e6bb 100755
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -619,6 +619,52 @@ test_expect_success 'stdin update/create/verify combination works' '
 	test_must_fail git rev-parse --verify -q $c
 '
 
+test_expect_success 'stdin verify succeeds for correct value' '
+	git rev-parse $m >expect &&
+	echo "verify $m $m" >stdin &&
+	git update-ref --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin verify succeeds for missing reference' '
+	echo "verify refs/heads/missing $Z" >stdin &&
+	git update-ref --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q refs/heads/missing
+'
+
+test_expect_success 'stdin verify treats no value as missing' '
+	echo "verify refs/heads/missing" >stdin &&
+	git update-ref --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q refs/heads/missing
+'
+
+test_expect_success 'stdin verify fails for wrong value' '
+	git rev-parse $m >expect &&
+	echo "verify $m $m~1" >stdin &&
+	test_must_fail git update-ref --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin verify fails for mistaken null value' '
+	git rev-parse $m >expect &&
+	echo "verify $m $Z" >stdin &&
+	test_must_fail git update-ref --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin verify fails for mistaken empty value' '
+	M=$(git rev-parse $m) &&
+	test_when_finished "git update-ref $m $M" &&
+	git rev-parse $m >expect &&
+	echo "verify $m" >stdin &&
+	test_must_fail git update-ref --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'stdin update refs works with identity updates' '
 	cat >stdin <<-EOF &&
 	update $a $m $m
@@ -938,6 +984,52 @@ test_expect_success 'stdin -z update/create/verify combination works' '
 	test_must_fail git rev-parse --verify -q $c
 '
 
+test_expect_success 'stdin -z verify succeeds for correct value' '
+	git rev-parse $m >expect &&
+	printf $F "verify $m" "$m" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z verify succeeds for missing reference' '
+	printf $F "verify refs/heads/missing" "$Z" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q refs/heads/missing
+'
+
+test_expect_success 'stdin -z verify treats no value as missing' '
+	printf $F "verify refs/heads/missing" "" >stdin &&
+	git update-ref -z --stdin <stdin &&
+	test_must_fail git rev-parse --verify -q refs/heads/missing
+'
+
+test_expect_success 'stdin -z verify fails for wrong value' '
+	git rev-parse $m >expect &&
+	printf $F "verify $m" "$m~1" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z verify fails for mistaken null value' '
+	git rev-parse $m >expect &&
+	printf $F "verify $m" "$Z" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success 'stdin -z verify fails for mistaken empty value' '
+	M=$(git rev-parse $m) &&
+	test_when_finished "git update-ref $m $M" &&
+	git rev-parse $m >expect &&
+	printf $F "verify $m" "" >stdin &&
+	test_must_fail git update-ref -z --stdin <stdin &&
+	git rev-parse $m >actual &&
+	test_cmp expect actual
+'
+
 test_expect_success 'stdin -z update refs works with identity updates' '
 	printf $F "update $a" "$m" "$m" "update $b" "$m" "$m" "update $c" "$Z" "" >stdin &&
 	git update-ref -z --stdin <stdin &&