void-packages/common/hooks/post-pkg/01-xdelta_repolist.sh

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# This hook generates vcdiffs for repository data.
hook() {
[ -z "$XBPS_REPO_DELTAS" ] && return 0
type -P xdelta3 > /dev/null || return 0
find $XBPS_REPOSITORY -name "${XBPS_TARGET_MACHINE}-repodata.genVcdiff" | xargs -r sha256sum | \
while read chk oldfile; do
newfile=${oldfile/.genVcdiff/}
if ! cmp -s "${newfile}" "${oldfile}"; then
newdiff="${newfile}.${chk}.vcdiff"
xdelta3 -q -f -e -s "${oldfile}" "${newfile}" "${newdiff}"
for diff in ${newfile}.*.vcdiff; do
[ "${diff}" = "${newdiff}" ] && continue;
cp -- "${diff}" "${diff}.tmp"
xdelta3 -q -f merge -m "${diff}.tmp" "${newdiff}" "${diff}"
rm -- "${diff}.tmp"
done
fi
# generate an empty diff to the new file
newchk=`sha256sum ${newfile} | awk '{ print $1 }'`
xdelta3 -q -f -e -s "${newfile}" "${newfile}" "${newfile}.${newchk}.vcdiff"
rm -- "${oldfile}"
done
}