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<H1>[Mageia-dev] [Mageia 2 specifications] Systemd or not systemd</H1>
<B>Olivier Blin</B>
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TITLE="[Mageia-dev] [Mageia 2 specifications] Systemd or not systemd">mageia at blino.org
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<I>Fri Jul 15 01:08:38 CEST 2011</I>
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<PRE>Colin Guthrie <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">mageia at colin.guthr.ie</A>> writes:
>><i> Secondly, what should be the correct way of supporting systemd in a
</I>>><i> package? In Mandriva, I thought on adding a --with flag to
</I>>><i> enable/disable systemd, but in most cases it does (almost) nothing. All
</I>>><i> services which want to support systemd only need to place their files
</I>>><i> into /lib/systemd - and that's it. Should we support opting-out of
</I>>><i> systemd in specs? I believe fcrozat is having the same dilemma in SuSE
</I>>><i> now as well, and he settled on some common packaging macros.
</I>><i>
</I>><i> IMO, unless something goes horribly wrong with systemd (which I very
</I>><i> seriously doubt will happen - it's actually been amazing to watch this
</I>><i> project from birth to wide adoption) I'd say we just jump right in and
</I>><i> package the units unconditionally. They don't really take up much space
</I>><i> and do nothing if you choose to not use it for the time being. I think
</I>><i> by mga3 we'll likely *only* offer systemd (if not in mga2), so I'd say
</I>><i> putting in effort to opt out now is pretty much not going to be worth it.
</I>
I agree, it does not seem useful to avoid shipping systemd services.
Though, when systemd is enabled, what happens if one has both systemd +
sysvinit services files installed for a given package?
Will the initscript be run in addition to the systemd service?
>><i> Almost finally, should the systemd files belong to the main package, the
</I>>><i> same way as they do with initscripts-based one (e.g., the package would
</I>>><i> provide /lib/systemd/system/%{name}.service together with
</I>>><i> %_sysconfig/rc.d/init.d/%{name} for example), with no extra subpackages
</I>>><i> or flags - or should all systemd-specific files go into %{name}-systemd
</I>>><i> package for example? What do you think?
</I>><i>
</I>><i> I vote to put them in the same place as the initscripts-based ones. As I
</I>><i> predicted above, I reckon it won't take too long for systemd to be the
</I>><i> only system offered and obsoleting all those subpackages would be a bit
</I>><i> of a PITA down the line. And if systemd isn't used those files do
</I>><i> nothing, so no harm done.
</I>
Agreed as well.
>><i> And finally, what does seems to be the best way of starting to use
</I>>><i> systemd in cauldron? I have thought on 3 alternatives:
</I>>><i> - easy way, only having it packaged, but not
</I>>><i> providing/obsoleting/conflicting with sysvinit. This way, it will work
</I>>><i> when kernel is booted with init=/bin/systemd (the least invasive way)
</I>>><i> - compatible way (like in Mandriva) - it is available, systemd-sysvinit
</I>>><i> conflicts with sysvinit, so if someone installs systemd-sysvinit,
</I>>><i> sysvinit goes away and systemd is run by default. This seems to be the
</I>>><i> most sane way to me (but I could be biased), and it is easiest one for
</I>>><i> testing
</I>>><i> - ultimate way - systemd provides and obsoletes sysvinit and its
</I>>><i> goodies. This way, systemd will be the only one (e.g., highlander
</I>>><i> style). This is how fedora did it if I am not mistaken, but I am not
</I>>><i> sure if it the best way.
</I>>><i>
</I>>><i> So, that's it for now from my part..
</I>><i>
</I>><i> I'd like option 2 please! :) It doesn't exclude using option 1 along
</I>><i> with it (I was doing this for a while), so it's most flexible.
</I>
Option 2 seems good as well, but does it really have to uninstall
sysvinit? Isn't it enough to put some alternatives symlinks for
/sbin/init?
--
Olivier Blin - blino
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