#!/bin/sh

# (C) 2017-2026 by Christian Hesse <mail@eworm.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

set -e

# verify this is for us or exit gracefully
if [ "$(readlink '/system-update')" != '/var/cache/pacman/pkg' ]; then
	exit 0
fi

# force the proper action on failure, ...
if [ -e '/run/pacman-offline-poweroff' ]; then
	ln -sf ../../../usr/lib/systemd/system/poweroff.target \
		/run/systemd/system/pacman-offline-failure.target
else
	ln -sf ../../../usr/lib/systemd/system/reboot.target \
		/run/systemd/system/pacman-offline-failure.target
fi
# ... remove triggering symlink and reboot & poweroff override, ...
rm --force \
	/system-update \
	/run/systemd/system/systemd-poweroff.service \
	/run/systemd/system/systemd-reboot.service
# ... and reload
systemctl daemon-reload

# check battery level
if ! /usr/lib/systemd/systemd-battery-check; then
	echo 'Battery level is too low!' >&2
	exit 1
fi

# exclude /etc/pacman.d/offline.conf
function finish { rm -f /run/pacman.conf; }
trap finish EXIT
sed \
	-e '/^Include *= *\/etc\/pacman\.d\/offline\.conf$/s|^|#|' \
	-e '/^#Include *= *\/etc\/pacman\.d\/offline-include\.conf$/s|^#||' \
	< /etc/pacman.conf > /run/pacman.conf

# install updates
if [ "$(pacman --sync --print --needed archlinux-keyring | wc -l)" -gt 0 ]; then
	pacman --sync --noconfirm archlinux-keyring
fi
pacman --config /run/pacman.conf --sync --noconfirm --sysupgrade

# clean up config file, drop trap
rm -f /run/pacman.conf
trap - EXIT

# sync the storage
sync

# prepare for soft-reboot via override when applicable
if [ ! -e '/run/pacman-offline-poweroff' -a \
     -s "/usr/lib/modules/$(uname -r)/pkgbase" ]; then
	ln -sf ../../../usr/lib/systemd/system/systemd-soft-reboot.service \
		/run/systemd/system/systemd-reboot.service
	systemctl daemon-reload
fi

# All done, just touch a status file and exit successfully!
# (Soft-)Reboot or Poweroff is done by specific units.
touch /run/pacman-offline-done
