[Mageia-dev] [soft-commits] [4017] Include persistent-storage udev rules ( needed for UUID info on root disks during install)

[Colin Guthrie]

'Twas brillig, and Thierry Vignaud at 18/04/12 18:17 did gyre and gimble:
> On 11 April 2012 10:41, Colin Guthrie <gmane at colin.guthr.ie> wrote:
>>>> Include persistent-storage udev rules (needed for UUID info on root disks
>>>> during install)
>>>
>>> For the record, what does this fix?
>>
>> Sorry, I should have been more verbose.
>>
>> Basically because of the previous commit:
>> http://svnweb.mageia.org/soft?view=revision&revision=4014
>>
>> We can now generate a "hostonly" initrd, i.e. a nice small, "normal"
>> initrd that we typically produce, tailored for the system in question.
>>
>> As a fallout from this, when running the install with an encrypted root
>> partition (and possibly just a normal LVM, not sure), various udev
>> properties were not injected into the udev database. These properties
>> (FS_UUID - can be seen via e.g. udevadm info --query=property
>> --name=/dev/sda5) as needed by dracut to detect things properly (rather
>> than resulting to lots of weird and wonderful probing methods dracut
>> tries to use udev as it's primary source of info).
>>
>> So these rules ensured that the UUID of /dev/sd* partitions were
>> available in udev.
> 
> Maybe should we include them into rescue too, shouldn't we?

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
http://colin.guthr.ie/

Day Job:
  Tribalogic Limited http://www.tribalogic.net/
Open Source:
  Mageia Contributor http://www.mageia.org/
  PulseAudio Hacker http://www.pulseaudio.org/
  Trac Hacker http://trac.edgewall.org/