[Mageia-dev] minor systemd-related issues

Thu Apr 12 23:56:34 CEST 2012

'Twas brillig, and David Walser at 12/04/12 21:25 did gyre and gimble:
+> Colin Guthrie <mageia at ...> writes:
+>>> httpd is running, but it is using the LSB init script instead of
+>>> systemd units.  I believe Colin's intention was to have
+>>> apache-mpm-prefork install a symlink to httpd-prefork.service called
+>>> httpd.service, but this symlink does not exist.
+>>
+>> Are you sure? The %post script should certainly have done that....
+>>
+>> [colin <at> jimmy ~]$ rpm -q --scripts apache-mpm-prefork
+>> postinstall scriptlet (using /bin/sh):
+>> ln -s /lib/systemd/system/httpd-prefork.service
+>> /etc/systemd/system/httpd.service 2>/dev/null || :
+>>
+>> I guess the only possible explanation I can think of here is that
+>> somehow, apache-mpm-prefork was upgraded before systemd was installed!
+>> Perhaps we need to make sure system is installed early in the process?
+> 
+> I am sure.  The only symlink in /etc/systemd/system is default.target,
+> everything else there is directories.  Is that the right place to put that
+> symlink anyway?
+
+Yes, the /etc/.... tree is the right place for this as it's a symlink
+that could get overwritten by another mpm should the user decide it's
+the correct mpm for their setup. The generic httpd.service link serves
+two purposes here: 1. is to allow users to still refer to "httpd"
+service (i.e. the command "service httpd restart" will still work, and
+likewise calling the sysvinit script directly will also still redirect
+properly to systemctl) and 2. is to allow a smooth upgrade from mga1
+such that the "enabled" state of the httpd service is properly migrated too.
+
+> I hadn't thought of the possibility that systemd not being installed is the
+> problem, but I guess that's the only logical explanation (unless systemd somehow
+> swept that directory and deleted it for some reason).  I guess maybe the mpm
+> packages just need Requires(pre): systemd-units
+
+Maybe, but looking at deps, basesystem requires systemd which requires
+the units. Perhaps on upgrade, basesystem was not upgraded early enough.
+Or maybe rpm-helper was not installed early enough... dunno. I can't
+help but feel it would be overkill to add it to the mpm packages as a
+Requires(pre) - it feels like it's something we should just be able to
+rely on. That said, it would certainly work!
+
+Thinking about it, I reckon rpm-helper especially should be something
+that is always installed first on a big upgrade. There could be multiple
+files running e.g. %_post_service etc. in their post scripts but we
+certainly want the latest rpm-helper for that.
+
+Perhaps something to check out.
+
+Col
+
+
+-- 
+
+Colin Guthrie
+colin(at)mageia.org
+http://colin.guthr.ie/
+
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+