config: respect includes in protected config

Protected config is implemented by reading a fixed set of paths,
which ignores config [include]-s. Replace this implementation with a
call to config_with_options(), which handles [include]-s and saves us
from duplicating the logic of 1) identifying which paths to read and 2)
reading command line config.

As a result, git_configset_add_parameters() is unused, so remove it. It
was introduced alongside protected config in 5b3c650777 (config: learn
`git_protected_config()`, 2022-07-14) as a way to handle command line
config.

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

config.c

@@ -2391,11 +2391,6 @@ int git_configset_add_file(struct config_set *cs, const char *filename)
 	return git_config_from_file(config_set_callback, filename, cs);
 }
 
-int git_configset_add_parameters(struct config_set *cs)
-{
-	return git_config_from_parameters(config_set_callback, cs);
-}
-
 int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
 {
 	const struct string_list *values = NULL;
@@ -2640,24 +2635,15 @@ int repo_config_get_pathname(struct repository *repo,
 /* Read values into protected_config. */
 static void read_protected_config(void)
 {
-	char *xdg_config = NULL, *user_config = NULL, *system_config = NULL;
+	struct config_options opts = {
-
+		.respect_includes = 1,
+		.ignore_repo = 1,
+		.ignore_worktree = 1,
+		.system_gently = 1,
+	};
 	git_configset_init(&protected_config);
-
+	config_with_options(config_set_callback, &protected_config,
-	system_config = git_system_config();
+			    NULL, &opts);
-	git_global_config(&user_config, &xdg_config);
-
-	if (system_config)
-		git_configset_add_file(&protected_config, system_config);
-	if (xdg_config)
-		git_configset_add_file(&protected_config, xdg_config);
-	if (user_config)
-		git_configset_add_file(&protected_config, user_config);
-	git_configset_add_parameters(&protected_config);
-
-	free(system_config);
-	free(xdg_config);
-	free(user_config);
 }
 
 void git_protected_config(config_fn_t fn, void *data)

t/t0033-safe-directory.sh

@@ -70,4 +70,13 @@ test_expect_success 'safe.directory=*, but is reset' '
 	expect_rejected_dir
 '
 
+test_expect_success 'safe.directory in included file' '
+	cat >gitconfig-include <<-EOF &&
+	[safe]
+		directory = "$(pwd)"
+	EOF
+	git config --global --add include.path "$(pwd)/gitconfig-include" &&
+	git status
+'
+
 test_done

t/t0035-safe-bare-repository.sh

@@ -51,4 +51,13 @@ test_expect_success 'safe.bareRepository on the command line' '
 		-c safe.bareRepository=all
 '
 
+test_expect_success 'safe.bareRepository in included file' '
+	cat >gitconfig-include <<-\EOF &&
+	[safe]
+		bareRepository = explicit
+	EOF
+	git config --global --add include.path "$(pwd)/gitconfig-include" &&
+	expect_rejected -C outer-repo/bare-repo
+'
+
 test_done