#!/bin/sh

#

set -o errexit -o noglob;

glob() { set +o noglob; echo ${@}; set -o noglob; };

map() { local _ifs="${IFS}" _sep="${1}"; shift; IFS="${_sep}"; echo "${*}"; IFS="${_ifs}"; };

rc() { echo "${@}"; "${@}"; };

rotate_build() {

	local _build_dname="${1}" _hostname="${2}" _limit="${3}";

	local _dist_dates="";

	for _dist_fname in $(glob			\

			${_build_dname}/*.tar.xz	\

			${_build_dname}/*.tar.xz.asc); do

		if [ -e "${_dist_fname}" ]; then

			_dist_date="${_dist_fname#*@${_hostname}-}";

			_dist_date="${_dist_date%.tar.xz*}";

			_dist_date="${_dist_date%-[0-9][0-9]-[0-9][0-9]-[0-9][0-9]}";

			_dist_dates="${_dist_dates:+${_dist_dates} }${_dist_date}";

		fi;

	done;

	if [ -n "${_dist_dates}" ]; then

		rotate_build_dates "${_build_dname}" "${_dist_dates}" "${_limit}";

	fi;

};

rotate_build_dates() {

	local _build_dname="${1}" _dist_dates="${2}" _limit="${3}";

	local _dist_dates_count _dist_dates_count_limit="" _dist_fname="" _nl="

";	_dist_dates="$(map "${_nl}" ${_dist_dates} | sort | uniq)";

	_dist_dates_count="$(echo "${_dist_dates}" | wc -l)";

	if [ "${_dist_dates_count}" -gt "${_limit}" ]; then

		_dist_dates_count_limit=$((${_dist_dates_count}-${_limit}));

		_dist_dates="$(echo "${_dist_dates}" |\

				sed -n "1,${_dist_dates_count_limit}p")";

		for _dist_date in ${_dist_dates}; do

			for _dist_fname in $(glob	\

					${_build_dname}/*-${_dist_date}-*.tar.xz*); do

				rc rm -f "${_dist_fname}";

			done;

		done;

	fi;

};

rotate_builds() {

	local _build_dnames="${1}" _limit="${2}";

	local _hostname="$(hostname)";

	for _build_dname in ${_build_dnames}; do

		rotate_build "${_build_dname}" "${_hostname}" "${_limit}";

	done;

};

rotate_builds "${1}" "${2:-3}";

# vim:filetype=sh noexpandtab sw=8 ts=8