#!/bin/bash

set -euo pipefail
rootfs="${1}"

pushd "${rootfs}"

rm -rf ./usr/{lib/debug/,lib64/cmake/,include/}
rm -rf ./usr/lib/dracut/
rm -rf ./usr/share/initramfs-tools
rm -rf ./usr/src

mkdir -p ./usr/share/zfs/etc
rm -rf ./etc/{csh.env,environment.d/,profile.env}
cp -a ./etc/. ./usr/share/zfs/etc/

pushd ./usr/lib/systemd/system
while read cmd unit; do
  if [ "$cmd" = enable ]; then
    target=$(awk -F= '/WantedBy/ { print $2 }' $unit)
    mkdir -p "${target}.wants"
    ln -svr "${unit}" "${target}".wants/
  fi
done < <(grep -v '^#' "${rootfs}"/usr/lib/systemd/system-preset/50-zfs.preset)
mkdir -p "multi-user.target.d"
{ echo "[Unit]"; echo "Upholds=zfs.target"; } > "multi-user.target.d/10-zfs.conf"
popd

mkdir -p ./usr/lib/tmpfiles.d
cat <<EOF >./usr/lib/tmpfiles.d/10-zfs.conf
d  /etc/zfs                                                 0755  root  root  -  -
L  /etc/zfs/zed.d                                           -     -     -     -  /usr/share/zfs/etc/zfs/zed.d
L  /etc/zfs/zfs-functions                                   -     -     -     -  /usr/share/zfs/etc/zfs/zfs-functions
L  /etc/zfs/zpool.d                                         -     -     -     -  /usr/share/zfs/etc/zfs/zpool.d
C  /etc/systemd/system/systemd-udevd.service.d/10-zfs.conf  -     -     -     -  /usr/lib/systemd/system/systemd-udevd.service.d/10-zfs.conf
EOF

mkdir -p ./usr/lib/systemd/system/systemd-udevd.service.d
cat <<EOF >./usr/lib/systemd/system/systemd-udevd.service.d/10-zfs.conf
[Unit]
After=systemd-sysext.service
EOF
popd