Bug#982907: dh_installsystemd: use new needs-reload/needs-restart unit interface

[Luca Boccassi]

Source: debhelper
Priority: wishlist
Tags: bookworm
X-Debbugs-CC: pkg-systemd-maintainers at lists.alioth.debian.org

Dear Maintainer(s),

systemd v248 will ship with a new dbus/systemctl interface to mark a
unit as needing reload/restart, and a new dbus/systemctl to queue all
reload/restart jobs in a single command.
The RPM packaging/scripts are changing to use this instead of custom
batching.

I'm opening this ticket to explore whether it would be
possible/good/desirable to switch the debhelper tools to use this as
well in the future.

It looks like this:

systemctl set-property foo.service Markers=needs-restart
systemctl set-property bar.service Markers=needs-reload
...
systemctl reload-or-restart --marked

(or equivalent DBUS calls)

References:

https://github.com/systemd/systemd/commit/ff68472a20c208121b69ea13586f3105a219bc14
https://github.com/systemd/systemd/commit/c9615f73521986b3607b852c139036d58973043c
https://github.com/systemd/systemd/pull/18481/commits

The advantage being, you can mark a unit inline, but then batch the
actual jobs later/asynchronously.

Note that, given the interface has just been merged and is not yet
released, there is scope for improvements if there are debhelper-
specific concerns to address, given the feature first use is the RPM's
side of things.

Thoughts?

-- 
Kind regards,
Luca Boccassi
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