- /*
- * Commit object? Just return it, we'll do all the complex
- * reachability crud.
- */
- if (object->type == commit_type) {
- struct commit *commit = (struct commit *)object;
- object->flags |= flags;
- if (parse_commit(commit) < 0)
- die("unable to parse commit %s", name);
- if (flags & UNINTERESTING)
- mark_parents_uninteresting(commit);
- return commit;
+static void file_change(struct diff_options *options,
+ unsigned old_mode, unsigned new_mode,
+ const unsigned char *old_sha1,
+ const unsigned char *new_sha1,
+ const char *base, const char *path)
+{
+ tree_difference = TREE_DIFFERENT;
+}
+
+static struct diff_options diff_opt = {
+ .recursive = 1,
+ .add_remove = file_add_remove,
+ .change = file_change,
+};
+
+static int compare_tree(struct tree *t1, struct tree *t2)
+{
+ if (!t1)
+ return TREE_NEW;
+ if (!t2)
+ return TREE_DIFFERENT;
+ tree_difference = TREE_SAME;
+ if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "", &diff_opt) < 0)
+ return TREE_DIFFERENT;
+ return tree_difference;
+}
+
+static int same_tree_as_empty(struct tree *t1)
+{
+ int retval;
+ void *tree;
+ struct tree_desc empty, real;
+
+ if (!t1)
+ return 0;
+
+ tree = read_object_with_reference(t1->object.sha1, "tree", &real.size, NULL);
+ if (!tree)
+ return 0;
+ real.buf = tree;
+
+ empty.buf = "";
+ empty.size = 0;
+
+ tree_difference = 0;
+ retval = diff_tree(&empty, &real, "", &diff_opt);
+ free(tree);
+
+ return retval >= 0 && !tree_difference;
+}
+
+static void try_to_simplify_commit(struct commit *commit)
+{
+ struct commit_list **pp, *parent;
+
+ if (!commit->tree)
+ return;
+
+ if (!commit->parents) {
+ if (!same_tree_as_empty(commit->tree))
+ commit->object.flags |= TREECHANGE;
+ return;