[arch-general] BTRFS, Rollback, Grub2

[C Anthony Risinger]

On Mon, Aug 20, 2012 at 2:36 PM, 1126
<mailinglists at elfsechsundzwanzig.de> wrote:
> On Mon, 20. Aug 13:49, C Anthony Risinger wrote:
>>
>> in short, you need something like this in fstab or equiv:
>>
>> /dev/disk/by-label/btrfs-root  /var/lib/btrfs-root  btrfs
>> defaults,noatime,subvolid=0  0  0
>>
>> ... you need to mount `subvolid=0` or `subvolid=5` (same thing)
>> somewhere, and make snapshots from there.  subvolid 5 (for which 0 is
>> an alias) is hard-coded to the top-level root.
>>
>> maybe try this:
>>
>> https://wiki.archlinux.org/index.php?title=Installing_on_Btrfs_root&oldid=185175
>
> Hey, thanks! I now can create snapshots in __snapshot
> (/var/lib/btrfs-root/__snapshot), but I can't use rollback ... Might
> this be due to boot with systemd?

hmm, i wouldn't think so -- this is pretty low-level and should not be affected.

make sure you have the hook in your mkinitcpio.conf, and make sure
your not trying to rollback after a kernel update ... but you'll need
to elaborate more on what "I can't use rollback" really means (eg.
some output or description or something).

that said, i haven't actually ran the hook for awhile -- i had to ease
off the edge a bit -- and hence am running ext4 currently.  but in
light of recent grub2 developments, it sounds like kernel-level
rollbacks will finally be possible so lately i've been trying to
revisit this project.

i'd also like to get the hook -- or some form of it -- included in
Arch proper ...

-- 

C Anthony