commit-graph: show usage on "commit-graph [write|verify] garbage"

avar · gitster · commit 6d209a01f89f · 2021-08-30T17:06:18.000-07:00
Change the parse_options() invocation in the commit-graph code to
error on unknown leftover argv elements, in addition to the existing
and implicit erroring via parse_options() on unknown options.

We'd already error in cmd_commit_graph() on e.g.:

    git commit-graph unknown verify
    git commit-graph --unknown verify

But here we're calling parse_options() twice more for the "write" and
"verify" subcommands. We did not do the same checking for leftover
argv elements there. As a result we'd silently accept garbage in these
subcommands, let's not do that.

Signed-off-by: Ævar Arnfjörð Bjarmason &lt;avarab@gmail.com&gt;
Reviewed-by: Taylor Blau &lt;me@ttaylorr.com&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git a/builtin/commit-graph.c b/builtin/commit-graph.c
@@ -105,6 +105,8 @@ static int graph_verify(int argc, const char **argv)
 	argc = parse_options(argc, argv, NULL,
 			     options,
 			     builtin_commit_graph_verify_usage, 0);
+	if (argc)
+		usage_with_options(builtin_commit_graph_verify_usage, options);
 
 	if (!opts.obj_dir)
 		opts.obj_dir = get_object_directory();
@@ -262,6 +264,8 @@ static int graph_write(int argc, const char **argv)
 	argc = parse_options(argc, argv, NULL,
 			     options,
 			     builtin_commit_graph_write_usage, 0);
+	if (argc)
+		usage_with_options(builtin_commit_graph_write_usage, options);
 
 	if (opts.reachable + opts.stdin_packs + opts.stdin_commits > 1)
 		die(_("use at most one of --reachable, --stdin-commits, or --stdin-packs"));
diff --git a/t/t5318-commit-graph.sh b/t/t5318-commit-graph.sh
@@ -5,6 +5,11 @@ test_description='commit graph'
 
 GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS=0
 
+test_expect_success 'usage' '
+	test_expect_code 129 git commit-graph write blah &&
+	test_expect_code 129 git commit-graph write verify
+'
+
 test_expect_success 'setup full repo' '
 	mkdir full &&
 	cd "$TRASH_DIRECTORY/full" &&
