Function location_options_init

builtin/config.c:929–1009

}

static void location_options_init(struct config_location_options *opts,
				  const char *prefix)
{
	if (!opts->source.file)
		opts->source.file = opts->file_to_free =
			xstrdup_or_null(getenv(CONFIG_ENVIRONMENT));

	if (opts->use_global_config + opts->use_system_config +
	    opts->use_local_config + opts->use_worktree_config +
	    !!opts->source.file + !!opts->source.blob > 1) {
		error(_("only one config file at a time"));
		exit(129);
	}

	if (!startup_info->have_repository) {
		if (opts->use_local_config)
			die(_("--local can only be used inside a git repository"));
		if (opts->source.blob)
			die(_("--blob can only be used inside a git repository"));
		if (opts->use_worktree_config)
			die(_("--worktree can only be used inside a git repository"));
	}

	if (opts->source.file &&
			!strcmp(opts->source.file, "-")) {
		opts->source.file = NULL;
		opts->source.use_stdin = 1;
		opts->source.scope = CONFIG_SCOPE_COMMAND;
	}

	if (opts->use_global_config) {
		opts->source.file = opts->file_to_free = git_global_config();
		if (!opts->source.file)
			/*
			 * It is unknown if HOME/.gitconfig exists, so
			 * we do not know if we should write to XDG
			 * location; error out even if XDG_CONFIG_HOME
			 * is set and points at a sane location.
			 */
			die(_("$HOME not set"));
		opts->source.scope = CONFIG_SCOPE_GLOBAL;
	} else if (opts->use_system_config) {
		opts->source.file = opts->file_to_free = git_system_config();
		opts->source.scope = CONFIG_SCOPE_SYSTEM;
	} else if (opts->use_local_config) {
		opts->source.file = opts->file_to_free = repo_git_path(the_repository, "config");
		opts->source.scope = CONFIG_SCOPE_LOCAL;
	} else if (opts->use_worktree_config) {
		struct worktree **worktrees = get_worktrees();
		if (the_repository->repository_format_worktree_config)
			opts->source.file = opts->file_to_free =
				repo_git_path(the_repository, "config.worktree");
		else if (worktrees[0] && worktrees[1])
			die(_("--worktree cannot be used with multiple "
			      "working trees unless the config\n"
			      "extension worktreeConfig is enabled. "
			      "Please read \"CONFIGURATION FILE\"\n"
			      "section in \"git help worktree\" for details"));