Libguestfs - Dec 2021 - guestfs-tools for *BSD images

Hi Brady,
There is a related bug before: Bug 541618
<https://bugzilla.redhat.com/show_bug.cgi?id=541618> - guestfish not able
to mount freebsd ufs2 partitions automatically

On Wed, Dec 8, 2021 at 10:26 PM Laszlo Ersek <lersek at redhat.com> wrote:
> On 12/08/21 11:52, Richard W.M. Jones wrote:
> > On Tue, Dec 07, 2021 at 12:18:30PM -0600, Brady Pratt wrote:
> >> [    1.998352] >>>WARNING<<< Wrong ufstype may
corrupt your filesystem,
> default
> >> is ufstype=old
> >
> > The problem is this one and it's not easily resolvable.  UFS
isn't a
> > single filesystem type, it's a clade of filesystems which all
evolved
> > from a common ancestor through the various BSDs, but crucially have
> > the same magic number (so no way to differentiate them).  For *BSD
> > itself this isn't a problem since the same OS creates and consumes
the
> > filesystem.
>
> (I think it *should* be considered a problem even for the *BSDs; what
> about moving disks between different BSD versions or flavors?)
>
> > But it's a problem for Linux which must be told which
> > filesystem type to mount - and get it wrong, as you can see above, Bad
> > Things happen.
> >
> > So it's not really possible to resolve this in libguestfs as we
don't
> > know the filesystem type until after we have mounted and inspected it.
> >
> > Rich.
> >
>
> _______________________________________________
> Libguestfs mailing list
> Libguestfs at redhat.com
> https://listman.redhat.com/mailman/listinfo/libguestfs
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On 12/09/21 03:28, Yongkui Guo wrote:
> Hi Brady,
> There is a related bug before: Bug 541618
> <https://bugzilla.redhat.com/show_bug.cgi?id=541618> - guestfish not
able
> to mount freebsd ufs2 partitions automatically
The last comment on that bug is dated  2013-11-22 at present. With the
justification given by Rich in this very thread (= impossible to tell
apart different things that all claim to be UFS), is it even possible to
fix that bug? Should we close it as CANTFIX?

Thanks
Laszlo
> 
> On Wed, Dec 8, 2021 at 10:26 PM Laszlo Ersek <lersek at redhat.com>
wrote:
> 
>> On 12/08/21 11:52, Richard W.M. Jones wrote:
>>> On Tue, Dec 07, 2021 at 12:18:30PM -0600, Brady Pratt wrote:
>>>> [    1.998352] >>>WARNING<<< Wrong ufstype
may corrupt your filesystem,
>> default
>>>> is ufstype=old
>>>
>>> The problem is this one and it's not easily resolvable.  UFS
isn't a
>>> single filesystem type, it's a clade of filesystems which all
evolved
>>> from a common ancestor through the various BSDs, but crucially have
>>> the same magic number (so no way to differentiate them).  For *BSD
>>> itself this isn't a problem since the same OS creates and
consumes the
>>> filesystem.
>>
>> (I think it *should* be considered a problem even for the *BSDs; what
>> about moving disks between different BSD versions or flavors?)
>>
>>> But it's a problem for Linux which must be told which
>>> filesystem type to mount - and get it wrong, as you can see above,
Bad
>>> Things happen.
>>>
>>> So it's not really possible to resolve this in libguestfs as we
don't
>>> know the filesystem type until after we have mounted and inspected
it.
>>>
>>> Rich.
>>>
>>
>> _______________________________________________
>> Libguestfs mailing list
>> Libguestfs at redhat.com
>> https://listman.redhat.com/mailman/listinfo/libguestfs
>