On Mon, Oct 25, 2010 at 03:20:58PM -0500, C Anthony Risinger wrote:
For example, right now extlinux support booting btrfs, but _only_ from
the top-level root. if i just had a way to "swap" the top-level root
with a different subvol, i could overcome several problems i have with
users all at once:
) users install their system to the top-level root, which means it is
no longer manageable by snapshot scripts [currently]
) if the top-level root could be swapped, extlinux could then boot my
snapshot? (i'm probably wrong here)
I don't think this is a solution to the extlinux problem, but I've
moved roots into new subvolumes, basically something like this.
Root is mounted as /, I've also mounted the volume on /mounted in this
example.
# btrfs subvolume snapshot /mounted /mounted/newrootname
Now reboot, adding the subvol option to use the newrootname.
Go into /mounted and make sure files touced there don't show up in '/'
(we really are mounting the submount).
Then just use rm -rf to remove everything that isn't a subvol. I
don't know of an easy way to do that, and be careful.
This doesn't really change the default root, but by making a snapshot
of it, can move all of the data elsewhere.
David
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