config: move config_from_gitmodules to submodule-config.c

The .gitmodules file is not meant as a place to store arbitrary
configuration to distribute with the repository.

Move config_from_gitmodules() out of config.c and into
submodule-config.c to make it even clearer that it is not a mechanism to
retrieve arbitrary configuration from the .gitmodules file.

Signed-off-by: Antonio Ospite <ao2@ao2.it>
Acked-by: Brandon Williams <bmwill@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

config.c

@@ -2172,23 +2172,6 @@ int git_config_get_pathname(const char *key, const char **dest)
 	return repo_config_get_pathname(the_repository, key, dest);
 }
 
-/*
- * Note: This function exists solely to maintain backward compatibility with
- * 'fetch' and 'update_clone' storing configuration in '.gitmodules' and should
- * NOT be used anywhere else.
- *
- * Runs the provided config function on the '.gitmodules' file found in the
- * working directory.
- */
-void config_from_gitmodules(config_fn_t fn, void *data)
-{
-	if (the_repository->worktree) {
-		char *file = repo_worktree_path(the_repository, GITMODULES_FILE);
-		git_config_from_file(fn, file, data);
-		free(file);
-	}
-}
-
 int git_config_get_expiry(const char *key, const char **output)
 {
 	int ret = git_config_get_string_const(key, output);

config.h

@@ -215,16 +215,6 @@ extern int repo_config_get_maybe_bool(struct repository *repo,
 extern int repo_config_get_pathname(struct repository *repo,
 				    const char *key, const char **dest);
 
-/*
- * Note: This function exists solely to maintain backward compatibility with
- * 'fetch' and 'update_clone' storing configuration in '.gitmodules' and should
- * NOT be used anywhere else.
- *
- * Runs the provided config function on the '.gitmodules' file found in the
- * working directory.
- */
-extern void config_from_gitmodules(config_fn_t fn, void *data);
-
 extern int git_config_get_value(const char *key, const char **value);
 extern const struct string_list *git_config_get_value_multi(const char *key);
 extern void git_config_clear(void);

submodule-config.c

@@ -671,3 +671,20 @@ void submodule_free(struct repository *r)
 	if (r->submodule_cache)
 		submodule_cache_clear(r->submodule_cache);
 }
+
+/*
+ * Note: This function exists solely to maintain backward compatibility with
+ * 'fetch' and 'update_clone' storing configuration in '.gitmodules' and should
+ * NOT be used anywhere else.
+ *
+ * Runs the provided config function on the '.gitmodules' file found in the
+ * working directory.
+ */
+void config_from_gitmodules(config_fn_t fn, void *data)
+{
+	if (the_repository->worktree) {
+		char *file = repo_worktree_path(the_repository, GITMODULES_FILE);
+		git_config_from_file(fn, file, data);
+		free(file);
+	}
+}

submodule-config.h

@@ -2,6 +2,7 @@
 #define SUBMODULE_CONFIG_CACHE_H
 
 #include "cache.h"
+#include "config.h"
 #include "hashmap.h"
 #include "submodule.h"
 #include "strbuf.h"
@@ -55,4 +56,14 @@ void submodule_free(struct repository *r);
  */
 int check_submodule_name(const char *name);
 
+/*
+ * Note: This function exists solely to maintain backward compatibility with
+ * 'fetch' and 'update_clone' storing configuration in '.gitmodules' and should
+ * NOT be used anywhere else.
+ *
+ * Runs the provided config function on the '.gitmodules' file found in the
+ * working directory.
+ */
+extern void config_from_gitmodules(config_fn_t fn, void *data);
+
 #endif /* SUBMODULE_CONFIG_H */