rev-parse --verify: do not output anything on error

Before this patch, when "git rev-parse --verify" was passed at least one
good rev and then anything, it would output something for the good rev
even if it would latter exit on error.

With this patch, we only output something if everything is ok.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-rev-parse.c

@@ -28,8 +28,6 @@ static int symbolic;
 static int abbrev;
 static int output_sq;
 
-static int revs_count;
-
 /*
  * Some arguments are relevant "revision" arguments,
  * others are about output format or other details.
@@ -102,7 +100,6 @@ static void show_rev(int type, const unsigned char *sha1, const char *name)
 	if (!(filter & DO_REVS))
 		return;
 	def = NULL;
-	revs_count++;
 
 	if (type != show_type)
 		putchar('^');
@@ -150,7 +147,7 @@ static int show_flag(const char *arg)
 	return 0;
 }
 
-static void show_default(void)
+static int show_default(void)
 {
 	const char *s = def;
 
@@ -160,9 +157,10 @@ static void show_default(void)
 		def = NULL;
 		if (!get_sha1(s, sha1)) {
 			show_rev(NORMAL, sha1, s);
-			return;
+			return 1;
 		}
 	}
+	return 0;
 }
 
 static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
@@ -375,8 +373,9 @@ static void die_no_single_rev(int quiet)
 
 int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 {
-	int i, as_is = 0, verify = 0, quiet = 0;
+	int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
 	unsigned char sha1[20];
+	const char *name = NULL;
 
 	if (argc > 1 && !strcmp("--parseopt", argv[1]))
 		return cmd_parseopt(argc - 1, argv + 1, prefix);
@@ -568,12 +567,17 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 		/* Not a flag argument */
 		if (try_difference(arg))
 			continue;
-		if (!get_sha1(arg, sha1)) {
-			show_rev(NORMAL, sha1, arg);
-			continue;
+		name = arg;
+		type = NORMAL;
+		if (*arg == '^') {
+			name++;
+			type = REVERSED;
 		}
-		if (*arg == '^' && !get_sha1(arg+1, sha1)) {
-			show_rev(REVERSED, sha1, arg+1);
+		if (!get_sha1(name, sha1)) {
+			if (verify)
+				revs_count++;
+			else
+				show_rev(type, sha1, name);
 			continue;
 		}
 		if (verify)
@@ -583,10 +587,14 @@ int cmd_rev_parse(int argc, const char **argv, const char *prefix)
 			continue;
 		verify_filename(prefix, arg);
 	}
-	if (verify && revs_count == 1)
-		return 0;
-	show_default();
-	if (verify && revs_count != 1)
+	if (verify) {
+		if (revs_count == 1) {
+			show_rev(type, sha1, name);
+			return 0;
+		} else if (revs_count == 0 && show_default())
+			return 0;
 		die_no_single_rev(quiet);
+	} else
+		show_default();
 	return 0;
 }

t/t1503-rev-parse-verify.sh

@@ -83,17 +83,11 @@ test_expect_success 'fails silently when using -q' '
 	test -z "$(cat error)"
 '
 
-test_expect_success '1 no stdout output on error' '
+test_expect_success 'no stdout output on error' '
 	test -z "$(git rev-parse --verify)" &&
 	test -z "$(git rev-parse --verify foo)" &&
-	test -z "$(git rev-parse --verify baz HEAD)"
-'
-
-test_expect_failure '2 no stdout output on error' '
-	test -z "$(git rev-parse --verify HEAD bar)"
-'
-
-test_expect_failure '3 no stdout output on error' '
+	test -z "$(git rev-parse --verify baz HEAD)" &&
+	test -z "$(git rev-parse --verify HEAD bar)" &&
 	test -z "$(git rev-parse --verify $HASH2 HEAD)"
 '