#!/bin/execlineb -S0
# SPDX-FileCopyrightText: 2021-2022 Alyssa Ross <hi@alyssa.is>
# SPDX-License-Identifier: EUPL-1.2

export PATH /bin

if { mount -a }

piperw 3 4
if { fdmove 1 4 /etc/getuuids }
fdclose 4
# head -1 would be clearer, but it might use buffered I/O and consume
# too much from the fifo.  Ideally we'd have line(1) from illumos.
backtick ROOTFS_UUID { fdmove 0 3 dd count=1 bs=37 status=none }
backtick VERITY_UUID { fdmove 0 3 dd count=1 bs=37 status=none }
fdclose 3

if { mkfifo /dev/rootfs.poll }

background {
  fdclose 3
  mdevd -C -b134217728
}
importas -iu mdevd_pid !

if { modprobe ext4 }

# Do a blocking read on the fifo to wait for mdevd to find the
# partition.
if {
  redirfd -r 0 /dev/rootfs.poll
  redirfd -w 1 /dev/null
  head -c 1
}
background { kill $mdevd_pid }
background { rm /dev/rootfs.poll }

if {
  importas -i roothash roothash
  veritysetup open /dev/rootfs root-verity /dev/verity $roothash
}

background { rm /dev/rootfs /dev/verity }

if { mount /dev/mapper/root-verity /mnt/root }
wait { $mdevd_pid }

if { mount --move /proc /mnt/root/proc }
if { mount --move /sys /mnt/root/sys }
if { mount --move /dev /mnt/root/dev }

switch_root /mnt/root
/etc/init