Function systemd_timer_write_timer_file

builtin/gc.c:3001–3069

* Write the schedule information into a git-maintenance@ .timer * file using a custom minute. This timer file cannot use the templating * system, so we generate a specific file for each. */

 * system, so we generate a specific file for each.
 */
static int systemd_timer_write_timer_file(enum schedule_priority schedule,
					  int minute)
{
	int res = -1;
	char *filename;
	FILE *file;
	const char *unit;
	char *schedule_pattern = NULL;
	const char *frequency = get_frequency(schedule);
	char *local_timer_name = xstrfmt(SYSTEMD_UNIT_FORMAT, frequency, "timer");

	filename = xdg_config_home_systemd(local_timer_name);

	if (safe_create_leading_directories(the_repository, filename)) {
		error(_("failed to create directories for '%s'"), filename);
		goto error;
	}
	file = fopen_or_warn(filename, "w");
	if (!file)
		goto error;

	switch (schedule) {
	case SCHEDULE_HOURLY:
		schedule_pattern = xstrfmt("*-*-* 1..23:%02d:00", minute);
		break;

	case SCHEDULE_DAILY:
		schedule_pattern = xstrfmt("Tue..Sun *-*-* 0:%02d:00", minute);
		break;

	case SCHEDULE_WEEKLY:
		schedule_pattern = xstrfmt("Mon 0:%02d:00", minute);
		break;

	default:
		BUG("Unhandled schedule_priority");
	}

	unit = "# This file was created and is maintained by Git.\n"
	       "# Any edits made in this file might be replaced in the future\n"
	       "# by a Git command.\n"
	       "\n"
	       "[Unit]\n"
	       "Description=Optimize Git repositories data\n"
	       "\n"
	       "[Timer]\n"
	       "OnCalendar=%s\n"
	       "Persistent=true\n"
	       "\n"
	       "[Install]\n"
	       "WantedBy=timers.target\n";
	if (fprintf(file, unit, schedule_pattern) < 0) {
		error(_("failed to write to '%s'"), filename);
		fclose(file);
		goto error;
	}
	if (fclose(file) == EOF) {
		error_errno(_("failed to flush '%s'"), filename);