Merge pull request libgit2#4369 from libgit2/ethomson/checkout_typechange

Checkout typechange-only deltas

Author: pks-t

src/checkout.c

@@ -159,6 +159,19 @@ GIT_INLINE(bool) is_workdir_base_or_new(
 		git_oid__cmp(&newitem->id, workdir_id) == 0);
 }
 
+GIT_INLINE(bool) is_file_mode_changed(git_filemode_t a, git_filemode_t b)
+{
+#ifdef GIT_WIN32
+	/*
+	 * On Win32 we do not support the executable bit; the file will
+	 * always be 0100644 on disk, don't bother doing a test.
+	 */
+	return false;
+#else
+	return (S_ISREG(a) && S_ISREG(b) && a != b);
+#endif
+}
+
 static bool checkout_is_workdir_modified(
 	checkout_data *data,
 	const git_diff_file *baseitem,
@@ -200,7 +213,8 @@ static bool checkout_is_workdir_modified(
 	 */
 	if ((ie = git_index_get_bypath(data->index, wditem->path, 0)) != NULL) {
 		if (git_index_time_eq(&wditem->mtime, &ie->mtime) &&
-			wditem->file_size == ie->file_size)
+			wditem->file_size == ie->file_size &&
+			!is_file_mode_changed(wditem->mode, ie->mode))
 			return !is_workdir_base_or_new(&ie->id, baseitem, newitem);
 	}
 
@@ -214,6 +228,9 @@ static bool checkout_is_workdir_modified(
 	if (S_ISDIR(wditem->mode))
 		return false;
 
+	if (is_file_mode_changed(baseitem->mode, wditem->mode))
+		return true;
+
 	if (git_diff__oid_for_entry(&oid, data->diff, wditem, wditem->mode, NULL) < 0)
 		return false;
 

tests/checkout/tree.c

@@ -1514,6 +1514,51 @@ void test_checkout_tree__baseline_is_empty_when_no_index(void)
 	git_reference_free(head);
 }
 
+void test_checkout_tree__mode_change_is_force_updated(void)
+{
+	git_index *index;
+	git_reference *head;
+	git_object *obj;
+	git_status_list *status;
+
+	if (!cl_is_chmod_supported())
+		clar__skip();
+
+	assert_on_branch(g_repo, "master");
+	cl_git_pass(git_repository_index(&index, g_repo));
+	cl_git_pass(git_repository_head(&head, g_repo));
+	cl_git_pass(git_reference_peel(&obj, head, GIT_OBJ_COMMIT));
+
+	cl_git_pass(git_reset(g_repo, obj, GIT_RESET_HARD, NULL));
+
+	cl_git_pass(git_status_list_new(&status, g_repo, NULL));
+	cl_assert_equal_i(0, git_status_list_entrycount(status));
+	git_status_list_free(status);
+
+	/* update the mode on-disk */
+	cl_must_pass(p_chmod("testrepo/README", 0755));
+
+	cl_git_pass(git_checkout_tree(g_repo, obj, &g_opts));
+
+	cl_git_pass(git_status_list_new(&status, g_repo, NULL));
+	cl_assert_equal_i(0, git_status_list_entrycount(status));
+	git_status_list_free(status);
+
+	/* update the mode on-disk and in the index */
+	cl_must_pass(p_chmod("testrepo/README", 0755));
+	cl_must_pass(git_index_add_bypath(index, "README"));
+
+	cl_git_pass(git_checkout_tree(g_repo, obj, &g_opts));
+
+	cl_git_pass(git_status_list_new(&status, g_repo, NULL));
+	cl_assert_equal_i(0, git_status_list_entrycount(status));
+	git_status_list_free(status);
+
+	git_object_free(obj);
+	git_reference_free(head);
+	git_index_free(index);
+}
+
 void test_checkout_tree__nullopts(void)
 {
 	cl_git_pass(git_checkout_tree(g_repo, NULL, NULL));