git-svn: pass an unambiguous ref to rev-list when grafting-branches

diff --git a/builtin-diff-index.c b/builtin-diff-index.c
index eeeee93fb77cc39351d071060cce9fc87f9a0216..95a3db156bda2d1e8d2ad7bdf72a9f9a821c6f51 100644 (file)
--- a/builtin-diff-index.c
+++ b/builtin-diff-index.c
@@ -9,13 +9,13 @@ static const char diff_cache_usage[] =
 "[<common diff options>] <tree-ish> [<path>...]"
 COMMON_DIFF_OPTIONS_HELP;
 
-int cmd_diff_index(int argc, const char **argv, char **envp)
+int cmd_diff_index(int argc, const char **argv, const char *prefix)
 {
        struct rev_info rev;
        int cached = 0;
        int i;
 
-       init_revisions(&rev, setup_git_directory());
+       init_revisions(&rev, prefix);
        git_config(git_default_config); /* no "diff" UI options */
        rev.abbrev = 0;