udev and initramfs

[Tom H]

On Thu, Dec 9, 2010 at 5:26 AM, Loïc Grenié <loic.grenie at gmail.com> wrote:
> 2010/12/9 Tom H <tomh0665 at gmail.com>:
>> On Thu, Dec 9, 2010 at 3:52 AM, Loïc Grenié <loic.grenie at gmail.com> wrote:
>>>
>>>    I have a problem and I do not understand why... From udev (lucid: 151-12.2)
>>>  I have in file /lib/udev/rules.d/60-persistent-storage.rules:
>>>
>>> [snip]
>>> # probe filesystem metadata of optical drives which have a media inserted
>>> KERNEL=="sr*", ENV{ID_CDROM_MEDIA}=="?*",
>>> ENV{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}=="?*",
>>> IMPORT{program}="/sbin/blkid -o udev -p -u noraid -O
>>> $env{ID_CDROM_MEDIA_SESSION_LAST_OFFSET} $tempnode"
>>> # single-session CDs do not have ID_CDROM_MEDIA_SESSION_LAST_OFFSET
>>> KERNEL=="sr*", ENV{ID_CDROM_MEDIA}=="?*",
>>> ENV{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}=="",
>>> IMPORT{program}="/sbin/blkid -o udev -p -u noraid $tempnode"
>>>
>>> # probe filesystem metadata of disks
>>> KERNEL!="sr*", IMPORT{program}="/sbin/blkid -o udev -p $tempnode"
>>> [snip]
>>>
>>>  and in file /usr/share/initramfs-tools/hooks/udev:
>>>
>>> [snip]
>>> copy_exec /sbin/blkid /lib/udev
>>> [snip]
>>>
>>>   Thus blkid ends in /lib/udev on the initramfs. The consequence I have
>>>  is that the system won't reboot because blkid is not executed (because
>>>  udev will look for it in /sbin and it's not there) and I thus do not have the
>>>  links created in /dev/disk/by-uuid.
>>>
>>>    What I'd love to understand is why I seem to be the *only one* with
>>>  that problem. Are there somehow
>>>  /etc/udev/rules.d/60-persistent-storage.rules on "normal" systems
>>>  with a different call to blkid ? Does anybody understand what I have
>>>  modified to break my system ? How does your kernel command-line
>>>  look like (cat /proc/cmdline) ?
>>
>> If you unpack your initrd, you'll find that "/sbin/blkid" exists.
>
>    Well no, it's not there (that's why my system won't boot without tweaking,
>  and it's also the reason why I've asked for help in the first place). This
>  probably means I delete it somehow or I do not create it or whatever.
>
>       Thanks,

You're welcome.

You should check whether "/sbin/blkid" exists on your system because
it is explicitly copied by mkinitramfs (which is called by
update-initramfs).