set -ex -p pipefail
echo "Building initram disk"
mkdir -p $out/root
pushd $out/root

### copy rootfs
cp -prP $rootfs/* .
find . -type d -exec chmod 755 {} \;
mkdir sysroot

### create directories
ln -sf ../usr/lib/systemd/systemd init

### Create needed files
echo patos > ./etc/hostname

ln -sf /etc/os-release ./etc/initrd-release

# set default target to initrd inside initrd
ln -sf initrd.target ./usr/lib/systemd/system/default.target

# generate crypttab and fstab under /run
mkdir ./usr/lib/systemd/system/systemd-repart.service.d
cat <<EOF > ./usr/lib/systemd/system/systemd-repart.service.d/override.conf
[Unit]
After=sysroot-run.mount
Requires=sysroot-run.mount

[Service]
ExecStart=systemd-repart --dry-run=no --generate-crypttab=/run/crypttab --generate-fstab=/run/fstab
EOF

# bind mount /run to /sysroot/run
cat <<EOF > ./usr/lib/systemd/system/sysroot-run.mount
[Unit]
Before=initrd-fs.target
DefaultDependencies=false

[Mount]
Options=bind
What=/run
Where=/sysroot/run
EOF
mkdir ./usr/lib/systemd/system/initrd-fs.target.requires/
ln -sf ../sysroot-run.mount ./usr/lib/systemd/system/initrd-fs.target.requires/sysroot-run.mount

# gen initrd
find . -print0 | cpio --null --owner=root:root -o --format=newc | xz -9 --check=crc32 > ../initrd.xz

popd
rm -rf $out/root