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#!/usr/bin/env bash

if [[ ( ${BASH_VERSINFO[0]} == 4 && ${BASH_VERSINFO[1]} > 1 ) || ${BASH_VERSINFO[0]} > 4 ]] ; then
	shopt -s compat41
fi
set -e

ASTTOPDIR=${ASTTOPDIR:-.}

module_name=$1

if [[ -z ${module_name} ]] ; then
	echo "You must supply a module name."
	exit 64
fi

tmpdir=$(mktemp -d)
if [[ -z "${tmpdir}" ]] ; then
	echo "${module_name}: Unable to create temporary directory."
	exit 1
fi
trap "rm -rf ${tmpdir}" EXIT

sed -r -e "s/^([^ =]+)\s*=\s*(.*)$/\1=\"\2\"/g" ${ASTTOPDIR}/makeopts >${tmpdir}/makeopts
source ${tmpdir}/makeopts
if [[ -z "${ASTMODDIR}" ]] ; then
	echo "${module_name}: Unable to parse ${ASTTOPDIR}/makeopts."
	exit 1
fi

XMLSTARLET=${XMLSTARLET:-xmlstarlet}
if [[ "${XMLSTARLET}" = ":" ]] ; then
	echo "${module_name}: The externals downloader requires xmlstarlet to be installed."
	exit 1
fi

cache_dir="${EXTERNALS_CACHE_DIR}"
if [[ -z ${cache_dir} ]] ; then
	cache_dir=${tmpdir}
fi

version=$(${ASTTOPDIR}/build_tools/make_version ${ASTTOPDIR})
if [[ ! ${version} =~ ^(GIT-)?([^.-]+)[.-].* ]] ; then
	echo "${module_name}: Couldn't parse version ${version}"
	exit 1
fi
major_version=${BASH_REMATCH[2]}

if [[ "${major_version}" == "master" ]] ; then
	echo "${module_name}: External module downloading is not available in the 'master' git branch.  Please disable in menuselect and download manually."
	exit 1
fi

major_version=${major_version}.0

if [[ "${HOST_CPU}" = "x86_64" ]] ; then
	host_bits=64
else
	host_bits=32
fi

remote_url=$(${XMLSTARLET} sel -t -v "/menu/category/member[@name = '${module_name}']/member_data/downloader/@remote_url" ${ASTTOPDIR}/menuselect-tree || :)
if [[ -n "${remote_url}" ]] ; then
	remote_url="${remote_url}/asterisk-${major_version}/x86-${host_bits}"
else
	directory_name=$(${XMLSTARLET} sel -t -v "/menu/category/member[@name = '${module_name}']/member_data/downloader/@directory_name" ${ASTTOPDIR}/menuselect-tree || :)
	remote_url="http://downloads.digium.com/pub/telephony/${directory_name:-${module_name}}/asterisk-${major_version}/x86-${host_bits}"
fi

version_convert() {
	local v=${1##*_}
	if [[ ${v} =~ ([0-9]+)[.]([0-9]+)[.]([0-9]+) ]] ; then
		v=$(( ${BASH_REMATCH[1]}<<18 | ${BASH_REMATCH[2]}<<9 | ${BASH_REMATCH[3]} ))
	fi
	echo ${v}
}

${WGET} -q -O ${tmpdir}/manifest.xml ${remote_url}/manifest.xml || {
	echo "${module_name}: Unable to fetch ${remote_url}/manifest.xml"
	exit 1
}

rpv=$(${XMLSTARLET} sel -t -v "/package/@version" ${tmpdir}/manifest.xml)
rpvi=$(version_convert ${rpv})
echo "${module_name}: Remote package version ${rpv} (${rpvi})"

module_dir=${module_name}-${rpv}-x86_${host_bits}
tarball=${module_dir}.tar.gz
export need_install=0

if [[ -f ${DESTDIR}${ASTMODDIR}/${module_name}.manifest.xml ]] ; then
	package_arch=$(${XMLSTARLET} sel -t -v "/package/@arch" ${DESTDIR}${ASTMODDIR}/${module_name}.manifest.xml)
	ipv=$(${XMLSTARLET} sel -t -v "/package/@version" ${DESTDIR}${ASTMODDIR}/${module_name}.manifest.xml)
	ipvi=$(version_convert ${ipv})
	ip_major=${ipv%_*}
	echo "${module_name}: Installed package version ${ipv} (${ipvi})"
	if [[ "${ip_major}" != "${major_version}" || "${package_arch}" != "x86_${host_bits}" ]] ; then
		echo "${module_name}: The installed package is not for this version of Asterisk.  Reinstalling."
		need_install=1
	elif [[ ${rpvi} > ${ipvi} ]] ; then
		echo "${module_name}: A newer package is available"
		need_install=1
	else
		sums=$(${XMLSTARLET} sel -t -m "//file" -v "@md5sum" -n ${DESTDIR}${ASTMODDIR}/${module_name}.manifest.xml)
		for sum in ${sums} ; do
			install_path=$(${XMLSTARLET} sel -t -v "//file[@md5sum = '${sum}']/@install_path" ${DESTDIR}${ASTMODDIR}/${module_name}.manifest.xml )
			f=${DESTDIR}$(eval echo ${install_path})
			if [[ ! -f ${f} ]] ; then
				echo Not found: ${f}
				need_install=1
			else
				cs=$(md5sum ${f} | cut -b1-32)
				if [[ "${cs}" !=  "${sum}" ]] ; then
					echo Checksum mismatch: ${f}
					need_install=1
				fi
			fi
		done
	fi
else
	need_install=1
fi

if [[ ${need_install} == 1 ]] ; then
	if [[ ( -n "${ipvi}" ) && ${ipvi} > ${rpvi} ]] ; then
		echo "${module_name}: Installed package is newer than that available for download."
		exit 0
	fi
else
	echo "${module_name} is up to date."
	exit 0;
fi

need_download=1
if [[ -f ${cache_dir}/${module_name}.manifest.xml ]] ; then
	cpv=$(${XMLSTARLET} sel -t -v "/package/@version" ${cache_dir}/${module_name}.manifest.xml)
	cpvi=$(version_convert ${cpv})
	echo "${module_name}: Cached package version ${cpv} (${cpvi})"
	if [[ ${cpvi} == ${rpvi} && ( -f ${cache_dir}/${tarball} ) ]] ; then
		echo "${module_name}: Cached version is available."
		need_download=0
	fi
fi

if [[ ${need_download} = 1 ]] ; then
	echo "${module_name}: Downloading ${remote_url}/${tarball}"
	${WGET} -q -O ${cache_dir}/${tarball} ${remote_url}/${tarball} || {
		echo "${module_name}: Unable to fetch ${remote_url}/${tarball}"
		exit 1
	}
	cp ${tmpdir}/manifest.xml  ${cache_dir}/${module_name}.manifest.xml
fi

tar -xzf ${cache_dir}/${tarball} -C ${cache_dir}
trap "rm -rf ${cache_dir}/${module_dir} ; rm -rf ${tmpdir}" EXIT

echo "${module_name}: Installing."

if [[ $EUID == 0 ]] ; then
	install_params="--group=0 --owner=0"
fi

names=$(${XMLSTARLET} sel -t -m "//file" -v "@name" -n ${cache_dir}/${module_dir}/manifest.xml)
for name in ${names} ; do
	source_path=${cache_dir}/${module_dir}/${name}
	install_path=$(${XMLSTARLET} sel -t -v "//file[@name = '${name}']/@install_path" ${cache_dir}/${module_dir}/manifest.xml)
	install_path=${DESTDIR}$(eval echo ${install_path})
	executable=$(${XMLSTARLET} sel -t -v "//file[@name = '${name}']/@executable" ${cache_dir}/${module_dir}/manifest.xml || :)
	if [[ "${executable}" = "yes" ]] ; then
		mode=0755
	else
		mode=0644
	fi

	${INSTALL} -Dp ${install_params} --mode=${mode} ${source_path} ${install_path}

done
${INSTALL} -Dp ${install_params} --mode=0644 ${cache_dir}/${module_dir}/manifest.xml ${DESTDIR}${ASTMODDIR}/${module_name}.manifest.xml

echo "${module_name}: Installed."