repo-settings: introduce function to clear struct

We don't provide a way to clear a `struct repo_settings`, and instead
open-code this in `repo_clear()`. This is mixing up concerns and means
that developers have to touch multiple files whenever they add a new
field to the structure in case the associated resources need to be
released.

Provide a new `repo_settings_clear()` function to improve this.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

repo-settings.c

@@ -21,7 +21,6 @@ static void repo_cfg_int(struct repository *r, const char *key, int *dest,
 
 void prepare_repo_settings(struct repository *r)
 {
-	const struct repo_settings defaults = REPO_SETTINGS_INIT;
 	int experimental;
 	int value;
 	const char *strval;
@@ -35,7 +34,7 @@ void prepare_repo_settings(struct repository *r)
 	if (r->settings.initialized)
 		return;
 
-	memcpy(&r->settings, &defaults, sizeof(defaults));
+	repo_settings_clear(r);
 	r->settings.initialized++;
 
 	/* Booleans config or default, cascades to other settings */
@@ -143,6 +142,13 @@ void prepare_repo_settings(struct repository *r)
 		r->settings.packed_git_limit = ulongval;
 }
 
+void repo_settings_clear(struct repository *r)
+{
+	struct repo_settings empty = REPO_SETTINGS_INIT;
+	FREE_AND_NULL(r->settings.fsmonitor);
+	r->settings = empty;
+}
+
 enum log_refs_config repo_settings_get_log_all_ref_updates(struct repository *repo)
 {
 	const char *value;

repo-settings.h

@@ -73,6 +73,7 @@ struct repo_settings {
 }
 
 void prepare_repo_settings(struct repository *r);
+void repo_settings_clear(struct repository *r);
 
 /* Read the value for "core.logAllRefUpdates". */
 enum log_refs_config repo_settings_get_log_all_ref_updates(struct repository *repo);

repository.c

@@ -380,7 +380,7 @@ void repo_clear(struct repository *repo)
 	parsed_object_pool_clear(repo->parsed_objects);
 	FREE_AND_NULL(repo->parsed_objects);
 
-	FREE_AND_NULL(repo->settings.fsmonitor);
+	repo_settings_clear(repo);
 
 	if (repo->config) {
 		git_configset_clear(repo->config);