[Libguestfs] libguestfs and zfs-fuse

[Andre Goree]

On 02/05/2014 11:31 am, Pino Toscano wrote:
> On Tuesday 04 February 2014 09:54:58 Richard W.M. Jones wrote:
>> On Mon, Feb 03, 2014 at 09:14:09PM +0000, Richard W.M. Jones wrote:
>> > On Mon, Feb 03, 2014 at 03:29:37PM -0500, Andre Goree wrote:
>> > > Ahhh, understood.  I do have have an image I can provide that was
>> > > installed onto and MBR layout (seemed the easiest for libguestfs
>> > > to
>> > > understand, GPT is preferred if libguestfs works well with it, but
>> > > that's another matter I can look into later).  Standby let me
>> > > clean
>> > > it up a bit and I'll get it to you -- I'll put it on my box and
>> > > send
>> > > ya a link offlist.
>> >
>> > Yes it would be useful to have this image.  Either MBR or GPT
>> > should work equally well.
>> 
>> FYI Andre sent me a disk image:
>> 
>> $ qemu-img info FreeBSD_ZFS-test.qcow2
>> image: FreeBSD_ZFS-test.qcow2
>> file format: qcow2
>> virtual size: 1.0G (1073741824 bytes)
>> disk size: 1.0G
>> cluster_size: 65536
>> 
>> $ guestfish --ro -a FreeBSD_ZFS-test.qcow2
>> 
>> Welcome to guestfish, the guest filesystem shell for
>> editing virtual machine filesystems and disk images.
>> 
>> Type: 'help' for help on commands
>>       'man' to read the manual
>>       'quit' to quit the shell
>> 
>> ><fs> run
>> ><fs> list-filesystems
>> ><fs> list-partitions
>> 
>> /dev/sda1
>> 
>> ><fs> file /dev/sda1
>> 
>> ; partition 4: ID=0xa5, active, starthead 0, startsector 0, 50000
>> sectors
>> ><fs> vfs-type /dev/sda1
>> 
>> zfs_member
>> 
>> I tried opening it with virt-rescue, but for some reason the zfs-fuse
>> daemon would not start, and hence other commands such as zpool didn't
>> work.
> 
> I've taken a quick look at this, and got a bit more with:
>   ><rescue> ln -s ../run/lock /var/lock
>   ><rescue> zfs-fuse-helper start
>   Starting zfs-fuse: [  OK  ]
>   Immunizing zfs-fuse against OOM kills[  OK  ]
>   Mounting zfs partitions: [  OK  ]
> and after this the zpool/zfs commands were usable.
> 
> Just note that:
> a) the first command is not needed now with the newly released
>    development version libguestfs 1.25.33
> b) I couldn't mount the image you provided, since it was created with
>    versions of zpool and zfs greater than what zfs-fuse currently
>    supports (it seems not having been updated in a while...)
> so even if we automate somehow the starting of the zfs-fuse helper and
> the handling of zpool/zfs, I'm not sure it could be actually useful 
> with
> a zfs-fuse not supporting recent versions.
> (To have a test partition with ZFS, I had to create it on a
> Debian/kFreeBSD 6.0 (oldstable), as even Debian/kFreeBSD 7 (stable) had
> "too new" zfs stuff for zfs-fuse.)

Interesting, I had no idea zfs-fuse was so far behind.  Thanks for 
checking it out.

-- 
Andre Goree
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