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#!/bin/bash
# mkmetadata - copy package lists from work directory to output directory
# and create checksums/torrent files
readonly OUT_DIR="$1" # eg: ./out/x86_64-systemd-cli-2022.04
readonly ISO_FILENAME=$2 # eg: parabola-x86_64-systemd-cli-2022.04-netinstall.iso
readonly PKGLIST="$( readlink -f $3 2> /dev/null)"
readonly THIS_DIR="$(readlink -f "$(dirname $0)")"
# if a .torrent file is desired, see ./TORRENT_METADATA.sample
[[ -f "${THIS_DIR}/TORRENT_METADATA" ]] && source "${THIS_DIR}/TORRENT_METADATA"
which mktorrent &> /dev/null && readonly HAS_MKTORRENT=1 || readonly HAS_MKTORRENT=0
which rhash &> /dev/null && readonly HAS_RHASH=1 || readonly HAS_RHASH=0
[[ -n "${TORRENT_ANNOUNCE_URL}" ]] && readonly SHOULD_MKTORRENT=${HAS_MKTORRENT} || \
readonly SHOULD_MKTORRENT=0
[[ -n "${ISOS_URL}" ]] && readonly IMG_URL="${ISOS_URL}/$(basename ${OUT_DIR})/${ISO_FILENAME}"
[[ -n "${ISOS_URL}" ]] && readonly PUBLISH_MSG="The directory: '${OUT_DIR}' should be copied to the repo server entirely, preserving the directory name; such that it is accessible via the URL:\n\t${IMG_URL}/\nThe GPG signature of the ISO should be added to that directory; such that it is accessible at the URL:\n\t${IMG_URL}.sig"
readonly ISO_HOST_PATH=$(echo "$(basename ${OUT_DIR})/${ISO_FILENAME}" | sed 's|\s|%20|')
readonly WEBSEEDS_CSV=$(sed -E "s|([^ ]+)|\1/${ISO_HOST_PATH}|g" <<<"${TORRENT_WEBSEED_URLS[@]}" | tr ' ' ',')
readonly RELEASE_SED_RX='s|[^-]*-\(.*\)-\(.*\)-\(.*\)-\(.*\)-\(.*\)\.iso|\L\1 \u\2/\U\3 \4 \L\5|'
readonly PKGLIST_SUCCESS_MSG="\t=> copied $(basename ${PKGLIST} 2> /dev/null)"
readonly SHA512SUMS_SUCCESS_MSG="\t=> SHA512SUMS $( [[ -f "${OUT_DIR}/SHA512SUMS" ]] && echo 'appended' || echo 'generated' )"
readonly MAGNET_SUCCESS_MSG="\t=> ${ISO_FILENAME}.magnet generated"
readonly TORRENT_SUCCESS_MSG="\t=> ${ISO_FILENAME}.torrent generated"
readonly RHASH_NOT_FOUND_MSG="[mkmetadata]: 'rhash' is not installed - metadata files will not be generated"
readonly MAKE_METADATA_MSG="[mkmetadata]: preparing metadata"
MakeMetadata()
{
# copy package lists and generate checksums and optional torrent file
(( ${SHOULD_MKTORRENT} )) && MakeTorrent && echo -e ${TORRENT_SUCCESS_MSG}
[[ -f "${PKGLIST}" ]] && cp ${PKGLIST} . && echo -e ${PKGLIST_SUCCESS_MSG}
rhash --sha512 "${ISO_FILENAME}" >> SHA512SUMS && echo -e ${SHA512SUMS_SUCCESS_MSG}
rhash --magnet "${ISO_FILENAME}" > "${ISO_FILENAME}.magnet" && echo -e ${MAGNET_SUCCESS_MSG}
sort SHA512SUMS --key=2 --output=SHA512SUMS
}
MakeTorrent()
{
local release=$( sed "${RELEASE_SED_RX}" <<<${ISO_FILENAME})
local sig="$( [[ -n "${ISOS_URL}" ]] && echo "GPG signature: '${IMG_URL}.sig")"
local comment="$(sed 's|_RELEASE_|'"${release}"'|' <<<${TORRENT_COMMENT})\n${sig}"
# generate torrent file
mktorrent --announce=${TORRENT_ANNOUNCE_URL} \
--comment="${comment}" \
$([[ -n "${WEBSEEDS_CSV}" ]] && echo "--web-seed=${WEBSEEDS_CSV}") \
--piece-length=20 --no-date --verbose \
"${ISO_FILENAME}"
}
if ! (( ${HAS_RHASH} ))
then echo "$RHASH_NOT_FOUND_MSG"
elif [[ -d "${OUT_DIR}" ]] && [[ -f "${OUT_DIR}/${ISO_FILENAME}" ]]
then echo "$MAKE_METADATA_MSG"
pushd ${OUT_DIR} > /dev/null
MakeMetadata
popd > /dev/null
fi
[[ -n "${ISOS_URL}" ]] && echo -e "\n${PUBLISH_MSG}\n"
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