[parted-devel] [PATCH] support read-only and no-auto flags used by systemd-gpt-auto-generator

[Arvin Schnell]

On Wed, Sep 30, 2020 at 10:58:49AM -0700, Brian C. Lane wrote:

> If you read Table 24 of the UEFI spec[1] you will see that it says that
> attributes are controlled by the owner of the PartitionTypeGUID.

Thanks for pointing to that. I was not aware of those special
constraints for those bits.

> This means that you can't just arbitrarily carve out some bits and use
> them for new flags. They need to be tied to specific GUIDs and not
> effect other users of the GuidSpecific value.
> 
> So if you:
> 
>  * restore the GuidSpecific struct entry to its previous state
>  * tie read_only and no_auto to the systemd GUID(s)

The problem I see is that parted does not know about systemd
GUIDs (root on 32/64 bit x86/arm, home, ...). The only GUIDs that
systemd-gpt-auto-generator recognizes and parted knows seem to be
ESP and swap. But swap is hardly a GUID of systemd. ESP does not
need the GUID specific flag (it uses NO_BLOCK_IO_PROTOCOL).

Maybe systemd is wrong in using the NO_AUTO bit for swap.

Regards,
  Arvin

-- 
Arvin Schnell, <aschnell at suse.com>
Senior Software Engineer, Research & Development

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