[bug #66509] btrfs set-default overwritten by 10_linux script

Paul <[email protected]> Mon, 2 Dec 2024 07:18:10 -0500 (EST)

Newsgroups	gmane.comp.boot-loaders.grub.bugs
Message-ID	<[email protected]>

URL:
  <https://savannah.gnu.org/bugs/?66509>

                 Summary: btrfs set-default overwritten by 10_linux script
                   Group: GNU GRUB
               Submitter: paulk
               Submitted: Mon 02 Dec 2024 12:18:03 PM UTC
                Category: Configuration
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name:
        Originator Email:
             Open/Closed: Open
         Discussion Lock: Any
                 Release: Git master
                 Release:
         Reproducibility: Every Time
         Planned Release: None


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Follow-up Comments:


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Date: Mon 02 Dec 2024 12:18:03 PM UTC By: Paul <paulk>
Using a btrfs filesystem as root fs it should be possible to roll back.
This is done via *btrfs-progs*:
> btrfs subvolume set-default subvol path
But there is a script in grub that overrides the subvolume, so
default-subvolume does never take effect: *util/grub.d/10_linux.in*

This problem is also discussed in this forum - most important the last post
from Jul2024:
https://forum.manjaro.org/t/btrfs-system-wont-boot-from-the-default-subvolume/165058/28

When I comment out the lines for *'xbtrfs'* in the script, it works fine.
So, at least, when the current subvol is the default subvol, then it should
not be overwritten.







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