On Mon, Nov 29, 2021 at 04:38:26PM +0100, Pavel Raiskup wrote:
On Monday, November 29, 2021 4:02:23 PM CET Daniel P. Berrangé
wrote:
> On Mon, Nov 29, 2021 at 03:24:12PM +0100, Pavel Raiskup wrote:
> > Hello,
> >
> > anyone had a successful experience with Fedora 35 Cloud images, and
> > guestfish/virt-sysprep?
> >
> > Seems like we switched from ext4 or xfs to 'btrfs', and guestfish
> > doesn't work with the images, am I right? At least I had problems
> > on EL8 hypervisors so far. >
> As a general rule, libguestfs is only guaranteed to work if the
> host OS is the same or newer than the guest OS. It might (and often
> does) work if the host OS is older than the guest, but that's pot
> luck.
>
> The libguestfs appliance use the host kernel to access the filesystems,
> so if the guest OS kernel was newer, its filesystem may have used features
> that the host OS kernel doesn't understand.
>
> IOW, my assumption is that Fedora 35 xfs is using fetures that RHEL8
> xfs doesn't support.
Ah, not xfs, but you helped me. Now I understand what the message means :-)
$ virt-sysprep -a ...
[ 0.0] Examining the guest ...
virt-sysprep: error: libguestfs error: inspect_os: mount exited with status
32: mount: /tmp/btrfse5L6v2: unknown filesystem type 'btrfs'.
This is the absence of 'btrfs' on EL8. So there's no way out from this
on any currently supported RHEL, I bet.
I've not tried, but the container Neal points to in the other reply
may still work, if it includes a Fedora kernel vmlinux that libguestfs
can leverage. The host OS kernel is merely libguestfs' default choice,
you can point it to other kernels if you have some available
Regards,
Daniel
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