Reinstall a Service removed by a previous prerm only when the old prerm
uninstalls unconditionally, this dpkg run completed a stop job for it,
and its group comes from that same invocation's stdout journal entries.
Hand the evidence to the postinst through a single-use file tied to the
old version and cleared by every preinst.
Refs #8515
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Reinstall an existing Service while keeping its enabled, runtime-masked
and active state. Detect, from the journal, a running Service removed by
a previous deb prerm and reinstall it with its recorded group. Package
script output never reaches the app, so leave a /run marker that makes
the app offer a reinstall once when the Service is not ready.
Hold the core lifecycle until the package manager exits, even after the
startup install times out, so no core start overlaps the Service
reinstall; restart the app once a late install succeeds.
Refs #8515
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
