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set root knowing PARTUUID instead of UUID

From: Florian Wickert
Subject: set root knowing PARTUUID instead of UUID
Date: Fri, 21 Apr 2017 16:07:46 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Icedove/45.6.0

Hi all,

Is there any way to set the `root` variable knowing only the GPT partition PARTUUID?
For filesystems that offer (fs-)UUIDs I could use
    search --no-floppy --fs-uuid --set=root xxxx-xxx...
But on filesystems that don't, thats obviously not possible.
In my case the filesystem is SquashFS, which does not contain uuids or labels.

Thank you!

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