Re: expand-on-first-boot broken with btrfs subvolume

[Uladzimir Bely <ubely@ilbers.de>]

On Wed, 2025-01-22 at 18:21 -0800, Stephen Ecker wrote:
> I have an initramfs script that moves the root filesystem to btrfs
> subvolume on first boot.  This breaks the expand-last-partition.sh
> script for the oddest reason:
> 
> line 4:  findmnt / -o source -n
> 
> normally this line outputs something like: /dev/name,
> but when on a btrfs subvolume, it outputs: /dev/name[@subvol] 
> 
> This leads to the error: "Boot device equals root device - no
> partitioning found"
> not exactly sure why, as I didn't dissect every line. I found that
> changing the command in line 4 to: findmnt / -o sources -n 
> fixed the problem... I tried this after I noticed running findmnt / -
> -output-all, the device name alone was listed under SOURCES, where
> SOURCE had the subvol appended.
> 
> I don't really like this solution, partly because 1) an ubuntu
> installation I have doesn't even have the sources output (though it
> was added 3 years ago,
> see: https://github.com/util-linux/util-linux/blame/master/misc-utils
> /findmnt.c#L135 )... but mainly because I don't know exactly what
> this will look like for other device / filesystem types.
> 
> maybe we could add a sed expression to trim past the device name? 
> i.e.  
> 
> findmnt / -o source -n | sed 's, [\[.*]*,,' 
> 
> thoughts?

It doesn't look like something to be changed in Isar.

But you could simply have custom expand script in you layer that does
things you need.

| meta-your-layer/recipes-support/expand-on-first-boot/expand-on-first-
boot_%.bbappend:
| 
| ```
| FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
| ```
| meta-your-layer/recipes-support/expand-on-first-boot/files/expand-
last-partition.sh

So, bitbake will take the script from your layer while other files of
the recipe will be taken from isar's `meta` layer.

> thanks,
>    Stephen
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-- 
Best regards,
Uladzimir.



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