packaging: restart imsd and imsd-ofonod on upgrade

An upgrade left the old imsd and imsd-ofonod running until they were
next restarted, while a changed bus policy is live the moment apk writes
it: dbus-broker-launch reloads on its own. A policy that relies on a
check inside the daemons would face the old daemons in between.

Mark imsd.service and imsd-ofonod.service needs-restart in post-upgrade
scripts; the systemd trigger restarts them once the transaction is done
(enqueue-marked). A call in progress ends. The same scripts run as
post-install: `apk del` removes a package's files and leaves its daemon
running, so a later `apk add` of the package is this upgrade for that
daemon — and apk runs the post-install script, not post-upgrade, for a
package it adds. GNOME Calls 50.0 dials nothing after imsd-ofonod
restarts under it until it restarts too, so imsd-ofonod's ExecStartPost
restarts the Calls daemon of each user running one — not at the unit's
first start since boot, when a Calls that runs already is left alone.

A daemon older than 0.3.10 kept its bring-up throttle wait in memory
only, so a restart lost it. imsd's post-upgrade records that daemon's
invocation, and imsd-handover.sh, an ExecStartPre after ims-pdn-up.sh,
reads the invocation's journal and, while the fresh-SA throttle's wait
it finds there still runs (`spi-s=0`; the old daemon's other deferrals
are not handed over), writes what is left of it to the holds file when
this start's LOCAL is the address the wait was earned on, or when that
address cannot be read; when LOCAL is another address, only the verdict
that the old registration is gone.

Tested on the dev phone (KPN) in builds of this series; not every path
has run there.

packaging/APKBUILD.binary

@@ -5,8 +5,9 @@
 # README's "Cross-compiling" section into a proper apk — used by this repo's
 # package CI (packaging/build-package.sh, which also seds pkgver from
 # implementations/main.cpp) and runnable by hand. The source tarball is
-# produced by packaging/make-bin-tarball.sh; the desktop/preset files live
-# next to it in packaging/ (copy them beside this file). Since 2026-09-02
+# produced by packaging/make-bin-tarball.sh; the desktop/preset files and
+# the install scripts (*.post-upgrade, *.post-install) live next to it in
+# packaging/ (copy them beside this file). Since 2026-09-02
 # this is the only imsd packaging: fp6-img images install the apk this
 # builds from the registry rather than building their own.
 pkgname=imsd
@@ -29,6 +30,9 @@ provides="81voltd=$pkgver-r$pkgrel"
 # (ofono before systemd: systemd() amoves all of usr/lib/systemd/system,
 # so ofono() must take imsd-ofonod.service first)
 subpackages="$pkgname-ofono:ofono $pkgname-systemd"
+# restart the running daemons onto an upgrade (systemd's enqueue-marked); the
+# systemd subpackage marks imsd.service too, since it brings the unit file
+install="$pkgname.post-upgrade $pkgname.post-install $pkgname-ofono.post-upgrade $pkgname-ofono.post-install $pkgname-systemd.post-upgrade $pkgname-systemd.post-install"
 options="!check !tracedeps"
 source="
 	imsd-$pkgver.tar.gz
@@ -42,6 +46,7 @@ package() {
     install -Dm755 imsd-media "$pkgdir"/usr/libexec/imsd-media
     install -Dm755 imsd-dialerd "$pkgdir"/usr/bin/imsd-dialerd
     install -Dm755 ims-pdn-up.sh "$pkgdir"/usr/libexec/ims-pdn-up.sh
+    install -Dm755 imsd-handover.sh "$pkgdir"/usr/libexec/imsd-handover.sh
     install -Dm644 imsd.service "$pkgdir"/usr/lib/systemd/system/imsd.service
     install -Dm644 imsd-dialerd.desktop \
         "$pkgdir"/etc/xdg/autostart/imsd-dialerd.desktop
@@ -64,6 +69,8 @@ package() {
     printf '[Unit]\nConditionPathExists=/etc/imsd.env\n' \
         > "$pkgdir"/usr/lib/systemd/system/imsd.service.d/10-require-config.conf
     install -Dm755 imsd-ofonod "$pkgdir"/usr/bin/imsd-ofonod
+    install -Dm755 imsd-ofono-restart-calls.sh \
+        "$pkgdir"/usr/libexec/imsd-ofono-restart-calls.sh
     install -Dm644 imsd-ofonod.service \
         "$pkgdir"/usr/lib/systemd/system/imsd-ofonod.service
     install -Dm644 org.ofono.conf \
@@ -78,6 +85,7 @@ ofono() {
     pkgdesc="GNOME Calls (Phosh, GNOME Mobile) backend for imsd"
     depends="$pkgname=$pkgver-r$pkgrel calls"
     amove usr/bin/imsd-ofonod
+    amove usr/libexec/imsd-ofono-restart-calls.sh
     amove usr/lib/systemd/system/imsd-ofonod.service
     amove usr/share/dbus-1/system.d/imsd-ofono.conf
     amove usr/share/glib-2.0/schemas/90_imsd-ofono.gschema.override