regenerate-grub is missing, dependency: composefs missing

[EmKayUltra]

Describe the bug

Two-fold:

• composerefs is still missing when you run grub2-mkconfig

✗  sudo grub2-mkconfig -o /etc/grub2.cfg
/usr/bin/grub2-probe: error: failed to get canonical path of `composefs'.

• regenerate-grub should be re-added
  It seems that this has been fixed in the upstream, and bazzite has re-added regenerate-grub to ujust

Relevant isuses

• regenerate-grub is missing dependency: composefs #378
• grub2: Canonical path of "composefs" could not be determined bazzite#2519
• Remove all images with ostree-2024.10-1.fc41 (across all variants) main#712
• [BUG] unable to regenerate grub config due to path error secureblue/secureblue#1040
• Unable to update grub config: "grub2: Canonical path of "composefs" could not be determined #2519" bluefin#2582

Relevant commits

• ublue-os/bazzite@03d26b6
• ublue-os/bazzite@72e9992#diff-15018280c8c16bcb187db4a458f39474b1eabbefc30d0388c38fb60a05a643c4

What did you expect to happen?

I expected regenerate-grub to be available again, like it is in Bazzite.

Output of bootc status

✗  sudo bootc status
● Booted image: ghcr.io/ublue-os/aurora:stable
        Digest: sha256:5b42e5b9bca61cc240e5d455da1e972f1297b06e9831172b8222a9c85f18242c (amd64)
       Version: 42.20250803.1 (2025-08-03T06:04:13Z)

  Rollback image: ghcr.io/ublue-os/aurora:stable
          Digest: sha256:c59b10d3d1f970311d025d344f2f81e219484205ae1ea462d34bcfd52f650fc5 (amd64)
         Version: 42.20250703 (2025-07-03T00:56:31Z)

Output of groups

✗  groups
emkayultra wheel plugdev

Extra information or context

No response

[inffy]

The command is not anymore available in Aurora or bluefin.

[EmKayUltra]

@inffy Is it possible to implement the same fix that Bazzite has? Or is there a workaround for Bluefin/Aurora?

[EmKayUltra]

@inffy I was able to confirm the Bazzite fix works with a custom image:

[EmKayUltra]

@inffy Is there a technical reason to not implement this? It doesn't seem like an unusual use case, and people would kind of just expect it to work. The fix is relatively easy. If there's a way for me to contribute the fix, I'd be willing to give it a shot.

[inffy]

@inffy Is there a technical reason to not implement this? It doesn't seem like an unusual use case, and people would kind of just expect it to work. The fix is relatively easy. If there's a way for me to contribute the fix, I'd be willing to give it a shot.

The reason is that we don't want to support it.

[EmKayUltra]

@inffy Okay, I understand. What alternative do you recommend to people who would like to have grub do OS probing?

[castrojo]

It's probably easiest to copy the bazzite justfile to your homedir and edit it to your needs and run it locally.

[kartikynwa]

Here is the relevant change in grub2-mkconfig that makes it work: https://github.com/ublue-os/bazzite/blob/7d9f6d05df68c5af8be06a3da07c35e6718c8aa1/Containerfile#L535

For example, this worked for me. (I had to use bash.):

cp /usr/bin/grub2-mkconfig ~
sed -i "s|grub_probe\} --target=device /\`|grub_probe} --target=device /sysroot\`|g" ~/grub2-mkconfig
sudo ~/grub2-mkconfig -o ~/grub.cfg

Then check ~/grub.cfg. If it's alright copy it to /boot/grub2/grub.cfg. Backup the existing grub.cfg file just in case.