Thanks for the detailed discussions here @danielky.
I think I agree with your last statement in comment #3
> Detecting the raid-setup and the right disks might be out of scope for
> cc_grub_dpkg, so why not just skip setting the "grub-pc/install_devices" item
> if it is already set in debconf and there is no "grub-pc/install_devices"
> given in cc_grub_dpkg config?
In the case of the live installer, subiquity (via curtin) ends up
setting grub debconf selections. I do think cloud-init's
cc_grub_dpkg::fetcg_idevs function[1] could probably grow awareness of
debconf selections as that should be honored with precedence above local
discovery using grub probe.
I'll set this to triaged and confirm with the team tomorrow that this is
a reasonable approach/consensus for cloud-init.
As for the subiquity aspect of this bug, I agree is seems like providing either:
grub_dpkg:
enabled: false
-- or --
# reflecting the specific devices that were chosen during auto install would
make the most sense to ensure the system boots properly configured and
cloud-init does not overwrite values setup by the installer (via curtin)
grub_dpkg:
grub-pc/install_devices: <dev1> <dev2>
** Changed in: cloud-init
Status: Invalid => Triaged
** Changed in: cloud-init
Importance: Undecided => Medium
--
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Engineering Team, which is subscribed to cloud-init.
https://bugs.launchpad.net/bugs/1993503
Title:
grub_dpkg writes wrong device into debconf
Status in cloud-init:
Triaged
Status in subiquity:
New
Bug description:
After auto-installing ubuntu 22.04 onto a LV on a mdraid 1 with two
disks cc_grub_dpkg overrides the correct `grub-pc/install_devices`
debconf entry with a false one on first boot:
```
~# debconf-show grub-pc | grep grub-pc/install_devices:
* grub-pc/install_devices: /dev/disk/by-id/dm-name-vg0-lv_root
```
This breaks grub updates.
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