[Unit]
Description=Generate shutdown-ramfs
DefaultDependencies=no
Before=shutdown.target
ConditionFileIsExecutable=!/run/initramfs/shutdown

[Service]
Type=oneshot
# /tmp could be umounted at this point
# use /run as temporary directory
Environment=TMPDIR=/run
ExecStart=/usr/bin/mkinitcpio -A sd-shutdown -k none -c /dev/null -d /run/initramfs