reset $sha1 $pathspec: require $sha1 only to be treeish

diff --git a/builtin/diff.c b/builtin/diff.c
index 9650be2c50e6f79dbe033fae39f490d49c6318da..8c2af6cb43ca62f253e07903a8e3cce1080e335b 100644 (file)
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -130,8 +130,6 @@ static int builtin_diff_index(struct rev_info *revs,
                        usage(builtin_diff_usage);
                argv++; argc--;
        }
-       if (!cached)
-               setup_work_tree();
        /*
         * Make sure there is one revision (i.e. pending object),
         * and there is no revision filtering parameters.
@@ -140,8 +138,14 @@ static int builtin_diff_index(struct rev_info *revs,
            revs->max_count != -1 || revs->min_age != -1 ||
            revs->max_age != -1)
                usage(builtin_diff_usage);
-       if (read_cache_preload(revs->diffopt.pathspec.raw) < 0) {
-               perror("read_cache_preload");
+       if (!cached) {
+               setup_work_tree();
+               if (read_cache_preload(revs->diffopt.pathspec.raw) < 0) {
+                       perror("read_cache_preload");
+                       return -1;
+               }
+       } else if (read_cache() < 0) {
+               perror("read_cache");
                return -1;
        }
        return run_diff_index(revs, cached);
@@ -418,19 +422,3 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                refresh_index_quietly();
        return result;
 }
-
-void setup_diff_pager(struct diff_options *opt)
-{
-       /*
-        * If the user asked for our exit code, then either they want --quiet
-        * or --exit-code. We should definitely not bother with a pager in the
-        * former case, as we will generate no output. Since we still properly
-        * report our exit code even when a pager is run, we _could_ run a
-        * pager with --exit-code. But since we have not done so historically,
-        * and because it is easy to find people oneline advising "git diff
-        * --exit-code" in hooks and other scripts, we do not do so.
-        */
-       if (!DIFF_OPT_TST(opt, EXIT_WITH_STATUS) &&
-           check_pager_config("diff") != 0)
-               setup_pager();
-}