sha1_file: set whence in storage-specific info fn

diff --git a/builtin/diff-index.c b/builtin/diff-index.c
index e3d418361c7db8b4206019898d4373f31169652f..185e6f9b582fdcf15072038b570463a0cfb1bbf2 100644 (file)
--- a/builtin/diff-index.c
+++ b/builtin/diff-index.c
@@ -18,9 +18,12 @@ int cmd_diff_index(int argc, const char **argv, const char *prefix)
        int i;
        int result;
 
+       if (argc == 2 && !strcmp(argv[1], "-h"))
+               usage(diff_cache_usage);
+
+       git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        init_revisions(&rev, prefix);
        gitmodules_config();
-       git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
        rev.abbrev = 0;
        precompose_argv(argc, argv);