[bug #48228] grub-mkconfig assumes grub-probe will only produce 1 line of output, breaks with mirrored zfs volumes

[Will Rouesnel]

URL:
  <http://savannah.gnu.org/bugs/?48228>

                 Summary: grub-mkconfig assumes grub-probe will only produce 1
line of output, breaks with mirrored zfs volumes
                 Project: GNU GRUB
            Submitted by: wrouesnel
            Submitted on: Tue 14 Jun 2016 11:49:58 PM GMT
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Will Rouesnel
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: 2.02~beta1
         Reproducibility: Every Time
         Planned Release: None

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Details:

Using 2.02~beta2-36ubuntu3 and a ZFS root setup with mirrored, encrypted
drives, I've had multiple problems with the grub-mkconfig script and libraries
assuming that the output from grub-probe will only ever be a single line.

This leads to malformed set root= entries which break booting, malformed
cryptomount entries etc.

The ideal solution would be to support generating something like the windows
bootloader with "plex 2" when using a mirrored boot configuration in case one
drive fails. As it stands for a workaround I've simply added `| sort | head
-n1` pipes to the grub-probe commands to generate reproducible and correct
output.





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File Attachments:


-------------------------------------------------------
Date: Tue 14 Jun 2016 11:49:58 PM GMT  Name: mkconfig.patch  Size: 2kB   By:
wrouesnel
Example patches for consistent behavior, probably not the right long-term
solution.
<http://savannah.gnu.org/bugs/download.php?file_id=37478>
-------------------------------------------------------
Date: Tue 14 Jun 2016 11:49:58 PM GMT  Name: grub-mkconfig.patch  Size: 1kB  
By: wrouesnel
Example patches for consistent behavior, probably not the right long-term
solution.
<http://savannah.gnu.org/bugs/download.php?file_id=37479>

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