[pkg-cryptsetup-devel] Bug#784881: Bug#784881: cryptsetup: WARNING: failed to detect canonical device

[Paride Legovini]

On 2016-10-06 22:12, Guilhem Moulin wrote:
> On Thu, 06 Oct 2016 at 19:42:55 +0200, Paride Legovini wrote:
>> cryptsetup: WARNING: failed to detect canonical device of /dev/sda2
> 
> For the record, the hook script gives this warning as it doesn't know
> whether the device is to be unlocked at initramfs stage or not.
> (Depending on what's on the device, not unlocking it initramfs stage can
> render the system unbootable.)  Identifying the device by its LABEL or
> UUID (or for dm devices, using the the dm name prefixed with
> /dev/mapper) should be enough to take it away.

Thanks for the explanation. It's still strange that I'm getting this
warning as /dev/sda2 is identified by its UUID (in /etc/fstab,
/etc/crypttab is empty).

>> cryptsetup: WARNING: could not determine root device from /etc/fstab
> 
> Hmm.  This, on the other hand, should not happen if you have an entry in
> fstab(5) for the root mountpoint, regardless of whether the device is
> encrypted or not.  Looking at the hook script's diff since 1.7.0-2 it's
> unclear to me what now causes the warning to appear.  Could you share
> your /etc/fstab?
> 

Here is it (long lines, sorry):

# <file system>                           <mount point>   <type>
<options>                <dump>  <pass>
# / was on /dev/sda2 during installation
UUID=5651d651-5c48-425f-9fc9-56f2a9ad004f /               btrfs
ssd,noatime,compress=lzo 0       1
# /boot/efi was on /dev/sda1 during installation
UUID=4791-AD68                            /boot/efi       vfat
umask=0077               0       1

/dev/sdb1                                 /mnt/16GB       ext4
defaults                 0       2

The output of blkid /dev/sda2 is:

/dev/sda2: UUID="5651d651-5c48-425f-9fc9-56f2a9ad004f"
UUID_SUB="2b8d065b-1f69-4770-a9ba-c3f8dde65425" TYPE="btrfs"
PARTUUID="729a63f7-aef7-4310-8512-e2d2d761dbe7"

so the UUID is correct.

Thank you,

Paride


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