avoid accessing _all_ loose refs in git-show-ref --verify

If you want to verify a ref, it is overkill to first read all loose refs
into a linked list, and then check if the desired ref is there.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Acked-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>

diff --git a/builtin-show-ref.c b/builtin-show-ref.c
index b36f15eeaa1d8ab4416f4716eda9149ef60ca763..23e0ff8fbfea1ca29e4beb18c95475dd8bdae05b 100644 (file)
--- a/builtin-show-ref.c
+++ b/builtin-show-ref.c
@@ -213,6 +213,23 @@ int cmd_show_ref(int argc, const char **argv, const char *prefix)
                        return exclude_existing(arg + 19);
                usage(show_ref_usage);
        }
+
+       if (verify) {
+               unsigned char sha1[20];
+
+               while (*pattern) {
+                       if (resolve_ref(*pattern, sha1, 1, NULL))
+                               printf("%s %s\n", sha1_to_hex(sha1),
+                                      *pattern);
+                       else if (!quiet)
+                               die("'%s' - not a valid ref", *pattern);
+                       else
+                               return 1;
+                       pattern++;
+               }
+               return 0;
+       }
+
        if (show_head)
                head_ref(show_ref, NULL);
        for_each_ref(show_ref, NULL);