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<H1>[Mageia-dev] [soft-commits] [4017] Include persistent-storage udev rules ( needed for UUID info on root disks during install)</H1>
<B>Colin Guthrie</B>
<A HREF="mailto:mageia-dev%40mageia.org?Subject=Re%3A%20%5BMageia-dev%5D%20%5Bsoft-commits%5D%20%5B4017%5D%20Include%20persistent-storage%0A%20udev%20rules%20%28%20needed%20for%20UUID%20info%20on%20root%20disks%20during%20install%29&In-Reply-To=%3C4F8F1B34.3040506%40colin.guthr.ie%3E"
TITLE="[Mageia-dev] [soft-commits] [4017] Include persistent-storage udev rules ( needed for UUID info on root disks during install)">mageia at colin.guthr.ie
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<I>Wed Apr 18 21:51:16 CEST 2012</I>
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<PRE>'Twas brillig, and Thierry Vignaud at 18/04/12 18:17 did gyre and gimble:
><i> On 11 April 2012 10:41, Colin Guthrie <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">gmane at colin.guthr.ie</A>> wrote:
</I>>>>><i> Include persistent-storage udev rules (needed for UUID info on root disks
</I>>>>><i> during install)
</I>>>><i>
</I>>>><i> For the record, what does this fix?
</I>>><i>
</I>>><i> Sorry, I should have been more verbose.
</I>>><i>
</I>>><i> Basically because of the previous commit:
</I>>><i> <A HREF="http://svnweb.mageia.org/soft?view=revision&revision=4014">http://svnweb.mageia.org/soft?view=revision&revision=4014</A>
</I>>><i>
</I>>><i> We can now generate a "hostonly" initrd, i.e. a nice small, "normal"
</I>>><i> initrd that we typically produce, tailored for the system in question.
</I>>><i>
</I>>><i> As a fallout from this, when running the install with an encrypted root
</I>>><i> partition (and possibly just a normal LVM, not sure), various udev
</I>>><i> properties were not injected into the udev database. These properties
</I>>><i> (FS_UUID - can be seen via e.g. udevadm info --query=property
</I>>><i> --name=/dev/sda5) as needed by dracut to detect things properly (rather
</I>>><i> than resulting to lots of weird and wonderful probing methods dracut
</I>>><i> tries to use udev as it's primary source of info).
</I>>><i>
</I>>><i> So these rules ensured that the UUID of /dev/sd* partitions were
</I>>><i> available in udev.
</I>><i>
</I>><i> Maybe should we include them into rescue too, shouldn't we?
</I>
Yeah that makes sense IMO. Sorry I should have fixed it there too. We
may also want to investigate whether or not we should "fake" a dracut
boot (i.e. mount /run and make sure the folder /run/initramfs exists).
The only real requirement is that all the necessary info is available in
udev to generate an initrd. I think with the rules and with udev
starting before any lvm/crypt commands then that should be fine.
Longer term, I think we can maybe look to use dracut itself to create a
rescue image itself (and maybe even stage1)... but that's for another day :D
Col
--
Colin Guthrie
colin(at)mageia.org
<A HREF="http://colin.guthr.ie/">http://colin.guthr.ie/</A>
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