[bug #45709] Grub git master makes bad grub.cfg with btrfs raid of lvm volumes

[James Harvey]

URL:
  <http://savannah.gnu.org/bugs/?45709>

                 Summary: Grub git master makes bad grub.cfg with btrfs raid
of lvm volumes
                 Project: GNU GRUB
            Submitted by: jamespharvey20
            Submitted on: Thu 06 Aug 2015 09:41:05 PM GMT
                Category: None
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: James Harvey
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Git master
         Reproducibility: Every Time
         Planned Release: None

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Details:

grub 2.02.beta2 (-5 Arch, using git tag grub-2.02-beta2" works fine.  git
master produces this bug.  git master, even with patch 45163.patch which I
hoped would fix this (at http://savannah.gnu.org/bugs/?45163) still causes
this bug.

grub-mkconfig runs "/usr/bin/grub-probe --target=device /boot", which
outputs:

=====
/dev/mapper/disk1-terra1
/dev/mapper/disk2-terra2
/dev/mapper/disk3-terra3
=====

On my system with a btrfs raid1 made up of 3 logical volumes from LVM.  This
causes /boot/grub/grub.cfg to contain:

=====
...
        echo    'Loading Linux linux ...'
        linux   /original/boot/vmlinuz-linux root=/dev/mapper/disk1-terra1
/dev/mapper/disk2-terra2
/dev/mapper/disk3-terra3 rw rootflags=subvol=original  consoleblank=0
init=/usr/lib/systemd/systemd fbcon=scrollback:128k
        echo    'Loading initial ramdisk ...'
...
=====

Which causes a boot failure, as it the kernel line is spread out across 3
separate lines, and contains two mapper volumes it doesn't need due to the way
btrfs raid works.

/boot/grub/grub.cfg also has:

=====
set
root='lvmid/VSnSKT-mFjn-H3fD-xC1o-eyCG-3a5S-rgNQy3/thnod1-e6Gy-O5Gl-8t6h-6zGv-zPjV-jG1kUK
               
lvmid/4fRRgD-yA28-KKou-f2Uj-RhFP-nFBd-K7ysCV/DoXOeq-5RM2-OdZI-5Tt3-C41n-ROYj-eAT0bp
               
lvmid/uwsOsc-fegJ-RM3r-qASe-Ix0w-MiVx-BNqmeS/xie7dX-aAXH-Iet7-O8Bl-2sxU-82Am-hifghT'
=====

/boot/grub/grub.cfg also includes 3 "insmod part_gpt" and 3 "insmod lvm" which
probably doesn't matter that it's duplicated, but would be nice to be fixed.




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