Check config files variables

	flock -n 9 || fail "Unable to lock. ${0##*/} already running."

}

enforce_config_vars() {

	local val

	for val; do

		[[ -n ${!val} ]] || fail "Missing $val directive in config file."

	done

}

# load archive configuration

load_config() {

	local conf=${ARCHIVE_CONFIG:-/etc/archive.conf}

	[[ -e "$conf" ]] || fail "No such config file: $conf."

	msg "Loading configuration: $conf"

	. "$conf" || fail 'Failed to load archive config.'

	enforce_config_vars ARCHIVE_RSYNC ARCHIVE_DIR ARCHIVE_USER \

		ARCHIVE_GROUP PKGEXT PKGSIG UMASK ARCHIVE_REPO ARCHIVE_ISO

	if [[ $ARCHIVE_REPO == "1" ]]; then

		enforce_config_vars REPO_DAYLY REPO_PACKAGES REPO_PACKAGES_INDEX \

			REPO_PACKAGES_FULL_SEARCH REPO_RSYNC_TIMEOUT

	fi

	if [[ $ARCHIVE_ISO == "1" ]]; then

		enforce_config_vars ISO_RSYNC_TIMEOUT

	fi

}

# snapshot a repository