Document git read-tree --trivial

diff --git a/builtin-show-ref.c b/builtin-show-ref.c
index ae0edddac1ad63b849dc341c8dd6519181c1e18e..9463ff0e69b15fc0e544259e64960bc942a98368 100644 (file)
--- a/builtin-show-ref.c
+++ b/builtin-show-ref.c
@@ -221,9 +221,11 @@ int cmd_show_ref(int argc, const char **argv, const char *prefix)
        }
 
        if (verify) {
-               unsigned char sha1[20];
-
+               if (!pattern)
+                       die("--verify requires a reference");
                while (*pattern) {
+                       unsigned char sha1[20];
+
                        if (!prefixcmp(*pattern, "refs/") &&
                            resolve_ref(*pattern, sha1, 1, NULL)) {
                                if (!quiet)