[Libguestfs] guestfs-tools for *BSD images

[Laszlo Ersek]

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.
>