ISO/archiso/initcpio/install/archiso_shutdown

#!/usr/bin/env bash

build() {
    add_binary cp

    add_runscript

    add_file /usr/lib/initcpio/archiso_shutdown /shutdown
}

help() {
    cat <<HELPEOF
This hook will create a shutdown initramfs in /run/initramfs
that we can pivot to on shutdown in order to unmount / and
and other mount points, dm-snapshot and loopback devices.
Mostly useful for persistent dm-snapshot.
HELPEOF
}