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bug#33517: Problem booting when using btrfs subvolume for /gnu/store

From: Christopher Baines
Subject: bug#33517: Problem booting when using btrfs subvolume for /gnu/store
Date: Sat, 01 Dec 2018 17:48:04 +0000
User-agent: mu4e 1.0; emacs 26.1

Ludovic Courtès <address@hidden> writes:

> Hello,
> Christopher Baines <address@hidden> skribis:
>> Unfortunately, it's not a proper solution, as it obviously breaks when
>> you actually want to strip the mount point off so that grub can find the
>> right files.
> Is there a way ‘strip-mount-point’ or some higher-level code could
> determine whether we actually need to strip the mount point?

So, this is the file-system value that I'm using currently for the
store. The information about subvolume is in the options value.

  (device (uuid "84fc6b78-d7ff-45df-8659-bef44b5bf0ea"))
  (type "btrfs")
  (title 'uuid)
  (mount-point "/gnu/store")
  (needed-for-boot? #t)
  (options "subvol=/gnu/store"))

I guess one approach for dealing with this would be to allow directly
configuring the stripping of the mount point somehow. Or maybe having
some btrfs-file-system record, which could store the subvol option in a
more machine readable way.

One thing that still makes me uncertian, is how grub actually is trying
to find files on the btrfs filesystem. I tried changing the default
subvolume to the one containing the store, but that didn't seem to
help. Looks like it might not be aware of subvolumes.

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