Files which are installed as-is (any .service and other unit files, .conf
files, .policy files, etc), are left as is. My assumption is that SPDX
identifiers are not yet that well known, so it's better to retain the
extended header to avoid any doubt.
I also kept any copyright lines. We can probably remove them, but it'd nice to
obtain explicit acks from all involved authors before doing that.
For quite a while now, there have been file triggers to handle
automatically setting up service units in upstream systemd. However,
most of the actions being done by these macros upon files can be set up
as RPM file triggers.
In fact, in Mageia, we had been doing this for most of these. In particular,
we have file triggers in place for sysusers, tmpfiles, hwdb, and the journal.
This change adds Lua versions of the original file triggers used in Mageia,
based on the existing Lua-based file triggers for service units.
In addition, we can also have useful file triggers for udev rules, sysctl
directives, and binfmt directives. These are based on the other existing
file triggers.
If we are running in a chroot/container/..., we would print a useless warning about
not being able to communicate with systemd. Trying to do daemon-reload is pointless
in those cases, so let's just skip all actions in that case.
The check uses /run/system/system, as recommended by sd_booted(3).
https://bugzilla.redhat.com/show_bug.cgi?id=1411299
At least the %filetriggerpostun script can be invoked hundreds of
times during an upgrade, so it makes sense to optimize it a bit.
assert(exec(...)) is used because of https://bugzilla.redhat.com/show_bug.cgi?id=1094072.
Add -P (--priority) to have %filetriggerpostun run as early as
possible (before any reload/stop actions), and %transfiletriggerin as
late as possible (after any enable/disable/preset actions).
This turns out to be more complicated than it looked initially...
%transfiletriggerun is called early, while %transfiletriggerin is
called late, and neither satifisfies the requirement to call
daemon-reload after new unit files have been installed, but before
%postun scripts in packages get to fire.
It seems that the only solution is to use %filetriggerun (which
is called once per package) to do the reload, and keep state in
/var/lib/rpm-state/systemd/ to avoid calling the reload multiple
times.
https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Saving_state_between_scriptlets
says that /var/lib/rpm-state/systemd/ is the right dir.
This uses new functionality added in rpm 4.13. Instead of doing
one daemon-reload per packages, we do just one or two
(When both installing and uninstalling packages, we do
two. Unfortunately this also includes the common case of upgrades.
When only installing or when only installing, we do just one.)
New file triggers.systemd can be built, but the contents have
to be copied into the rpm spec file by hand. Using %{load} does
not seem to work. It can serve as documentation.
