#!/bin/sh
# SPDX-License-Identifier: GPL-3.0-only
# SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
#
# Restart imsd onto the upgraded binary once apk is done: the systemd
# trigger restarts every unit marked needs-restart (enqueue-marked). A
# changed bus policy is live the moment apk writes it (dbus-broker-launch
# reloads on its own), so it must not be left facing the old daemon. The
# restart resumes the registration over its existing SAs, or goes on
# waiting when the network had imsd wait; a call in progress ends.
#
# Also installed as imsd.post-install: `apk del imsd` removes the files
# and leaves the daemon running, so a later `apk add` of the package is
# this upgrade for that daemon, and apk runs post-install for it. A first
# install finds no unit active and marks nothing. On the binary route
# (APKBUILD.binary) the unit file ships in imsd-systemd, installed after
# this package; its imsd-systemd.post-upgrade marks the unit then.
#
# A daemon older than 0.3.10 kept its bring-up throttle wait in memory
# only, so a restart inside it registered fresh at once instead of
# waiting the schedule out. Before marking, record the running
# invocation in /run/imsd.handover: the next start (imsd-handover.sh, an
# ExecStartPre after ims-pdn-up.sh) reads that invocation's last bring-up
# line once the daemon has stopped and hands what is left of its wait over
# as imsd's holds file (on another address only the verdict that its
# registration is gone). Read then, not here: a wait that ends between this
# script and the restart at the end of the transaction — the old daemon
# making another attempt — is read as it ended.

# A unit whose file an apk del removed is not-found to systemd until a
# reload and refuses properties ("failed to load properly"); its file is
# back on disk by the time post-install runs, so reload and mark again.
mark() {
	systemctl set-property "$1" Markers=+needs-restart 2>/dev/null && return 0
	systemctl daemon-reload && systemctl set-property "$1" Markers=+needs-restart || :
}

record_old_invocation() {
	[ -e /run/imsd.holds ] && return 0   # a 0.3.10 or later daemon keeps its own holds
	inv=$(systemctl show -P InvocationID imsd.service 2>/dev/null)
	[ -n "$inv" ] && echo "$inv" > /run/imsd.handover
}

if [ -d /run/systemd/system ] && systemctl is-active -q imsd.service; then
	record_old_invocation
	mark imsd.service
fi
exit 0