Merge branch 'jk/am-rerere-lock-fix'

Recent "git am" introduced a double-locking failure when used with
the "--3way" option that invokes rerere machinery.

* jk/am-rerere-lock-fix:
  rerere: release lockfile in non-writing functions

2 files changed, 9 insertions, 14 deletions

diff --git a/builtin/am.c b/builtin/am.c
index 27165a6730..83b3d86e67 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -2057,11 +2057,6 @@ static int clean_index(const unsigned char *head, const unsigned char *remote)
 static void am_rerere_clear(void)
 {
 	struct string_list merge_rr = STRING_LIST_INIT_DUP;
-	int fd = setup_rerere(&merge_rr, 0);
-
-	if (fd < 0)
-		return;
-
 	rerere_clear(&merge_rr);
 	string_list_clear(&merge_rr, 1);
 }
diff --git a/builtin/rerere.c b/builtin/rerere.c
index 7afadd2ead..12535c9b4f 100644
--- a/builtin/rerere.c
+++ b/builtin/rerere.c
@@ -50,7 +50,7 @@ static int diff_two(const char *file1, const char *label1,
 int cmd_rerere(int argc, const char **argv, const char *prefix)
 {
 	struct string_list merge_rr = STRING_LIST_INIT_DUP;
-	int i, fd, autoupdate = -1, flags = 0;
+	int i, autoupdate = -1, flags = 0;
 
 	struct option options[] = {
 		OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
@@ -79,18 +79,16 @@ int cmd_rerere(int argc, const char **argv, const char *prefix)
 		return rerere_forget(&pathspec);
 	}
 
-	fd = setup_rerere(&merge_rr, flags);
-	if (fd < 0)
-		return 0;
-
 	if (!strcmp(argv[0], "clear")) {
 		rerere_clear(&merge_rr);
 	} else if (!strcmp(argv[0], "gc"))
 		rerere_gc(&merge_rr);
-	else if (!strcmp(argv[0], "status"))
+	else if (!strcmp(argv[0], "status")) {
+		if (setup_rerere(&merge_rr, flags | RERERE_READONLY) < 0)
+			return 0;
 		for (i = 0; i < merge_rr.nr; i++)
 			printf("%s\n", merge_rr.items[i].string);
-	else if (!strcmp(argv[0], "remaining")) {
+	} else if (!strcmp(argv[0], "remaining")) {
 		rerere_remaining(&merge_rr);
 		for (i = 0; i < merge_rr.nr; i++) {
 			if (merge_rr.items[i].util != RERERE_RESOLVED)
@@ -100,13 +98,15 @@ int cmd_rerere(int argc, const char **argv, const char *prefix)
 				 * string_list_clear() */
 				merge_rr.items[i].util = NULL;
 		}
-	} else if (!strcmp(argv[0], "diff"))
+	} else if (!strcmp(argv[0], "diff")) {
+		if (setup_rerere(&merge_rr, flags | RERERE_READONLY) < 0)
+			return 0;
 		for (i = 0; i < merge_rr.nr; i++) {
 			const char *path = merge_rr.items[i].string;
 			const char *name = (const char *)merge_rr.items[i].util;
 			diff_two(rerere_path(name, "preimage"), path, path, path);
 		}
-	else
+	} else
 		usage_with_options(rerere_usage, options);
 
 	string_list_clear(&merge_rr, 1);