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<H1>[Mageia-dev] New Dracut: Please test</H1>
<B>Colin Guthrie</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20New%20Dracut%3A%20Please%20test&In-Reply-To=%3C4F3B8D06.40505%40colin.guthr.ie%3E"
TITLE="[Mageia-dev] New Dracut: Please test">mageia at colin.guthr.ie
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<I>Wed Feb 15 11:46:30 CET 2012</I>
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<PRE>'Twas brillig, and Thomas Backlund at 15/02/12 10:09 did gyre and gimble:
><i> Colin Guthrie skrev 15.2.2012 11:35:
</I>>><i> 'Twas brillig, and David W. Hodgins at 14/02/12 23:21 did gyre and
</I>>><i> gimble:
</I>>>><i> On Tue, 14 Feb 2012 10:55:17 -0500, Colin Guthrie
</I>>>><i> <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">mageia at colin.guthr.ie</A>> wrote:
</I>>>><i>
</I>>>>><i> Can everyone please test the new dracut please? Especially those of you
</I>>>><i>
</I>>>><i> I'll test it shortly. I think there is a slight problem when dracut
</I>>>><i> gets
</I>>>><i> updated at the same time as the kernel, udev, or anything else that is
</I>>>><i> going to get installed in the initramfs.
</I>>>><i>
</I>>>><i> Rather then triggering the running of dracut when the kernel gets
</I>>>><i> installed,
</I>>>><i> I think it would be better to have something that runs at the end of
</I>>>><i> urpmi
</I>>>><i> or MageiaUpdate, that check to see if dracut or anything in the existing
</I>>>><i> initramfs has been updated, and if so, then run dracut.
</I>><i>
</I>><i> The best I can do from kernel pov is to change %post into %posttrans so
</I>><i> creating initrd would happend at end of install transaction
</I>><i>
</I>>><i>
</I>>><i> Strangely enough I was thinking vaguely along the same lines. My issue
</I>>><i> was udev specifically. Sadly working out exactly when to rebuild the
</I>>><i> initramfs is pretty tricky, e.g. if lvm or dm tools are updated do we
</I>>><i> really need them in this particular setup's initramfs? Should we rebuild
</I>>><i> anyway (it should be safe) and accept the unnecessary work in those
</I>>><i> cases? Might be a reasonable thing to do...
</I>>><i>
</I>><i>
</I>><i> "it should be safe" - famous last words... :)
</I>
:<i>)
</I>
>><i> I guess then a filetrigger could be written that checks for files
</I>>><i> certain locations and triggers an initrd rebuild. For the kernel it
</I>>><i> would only build one, but for udev, dm, lvm etc. it would rebuild all of
</I>>><i> them...
</I>>><i>
</I>><i>
</I>><i> We should _never_ rebuild all initrds.
</I>><i> If/when one of the updated packaged has a critical systemcrashing bug,
</I>><i> we render the whole system unbootable.
</I>
Did we not used to do it when e.g. the bootspash theme changed? I
remember a while back I had a problem as my /boot was quite modest and
it ended up getting filled up with lots of .old files for the initrds....
That said, I can't really disagree.
>><i> Might confuse some people however and create cases working systems are
</I>>><i> hosed unnecessarily, and I'm not sure how much of real, practical
</I>>><i> problem it is to simply have a slightly outdated tools in the initram
</I>>><i> fs? Perhaps we just need to get ordering better on updates such that
</I>>><i> udev, lvm, dm etc. are all ordered before kernel during updates? Maybe
</I>>><i> that will solve 95% of the issues?
</I>>><i>
</I>><i>
</I>><i> That could be an option of we can get the tools to differentiate between
</I>><i> high-priority (glibc/rpm/urpm*/...), priority (udev/lvm/dm/...) and the
</I>><i> rest...
</I>><i>
</I>><i> Otoh, most of the issues we see now is Cauldron -> Cauldron updates.
</I>><i> in a stable release many of the packages wont change.
</I>
Yeah I think overall Cauldron->Cauldron is not that important in the
overall scheme of things. Users hear should be able to rebuild their
initrd with a quick command or two easily enough when needed.
><i> Of course that still leaves distro upgrades, but maybe that can be
</I>><i> handled in the installer or by adding versionated conflicts to kernel
</I>><i> to help urpmi figure out the order to update...
</I>
Yeah, that's probably a good shout. Just before release, we can put a
"Conflicts: udev < $latest" and similar stuff into the kernel... that
would likely catch most potential problems.
Col
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