[systemd-devel] Issues with /usr GPT auto-mount

[Michael Cassaniti]

Should I at least raise a feature request in GitHub?

Trust me when I say you don't want a PR from me. I've been poking around 
mkosi and my Python skills are a much better fit over there than my lack 
of C skills.

On 14/7/22 22:38, Lennart Poettering wrote:
> On Do, 14.07.22 12:08, Michael Cassaniti (michael at cassaniti.id.au) wrote:
>
>> Hi,
>>
>> I've read the below two articles and potentially made wrong assumptions
>> about how automatic discovery of GPT partitions works for EFI boot rather
>> than from systemd-nspawn.
>>
>> https://0pointer.net/blog/the-wondrous-world-of-discoverable-gpt-disk-images.html
>> (particularly the Versioning + Multi-Arch section)
>> https://0pointer.net/blog/fitting-everything-together.html
>>
>> After reading this on top of the gpt-auto-generator.c code (read doesn't
>> mean perfectly understood) I believe that only the root file system gets
>> mounted under an EFI boot. I was hoping that both root and /usr get mounted
>> as appropriate. I can confirm when using 'systemd-dissect /dev/sda' that
>> there is a designated /usr partition with a label that isn't '_empty' and
>> for the correct architecture.
>>
>> Either I've done something wrong and need help or systemd-gpt-auto-generator
>> is working correctly and I'm wrong. All feedback is appreciated.
> This functionality is still missing in systemd-gpt-generator
> currently. Would love to review/merge a patch that fills in the gap.
>
> (In my own usecase I always used usrhash= on the kernel cmdline, to
> pin a specific /usr/ fs to a specific kernel, thus /usr/ auto
> discovery was never needed, but we should definitely support that too)
>
> Lennart
>
> --
> Lennart Poettering, Berlin
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