There is ReFS driver for Linux by Paragon: https://www.paragon-software.com/home/refs-linux/

You are unlikely to include it onto libguestfs (it is proprietary and likely there are license restrictions) but I successfully used it my own to read ReFS file system from with libguestfs.

--
  Mykola Ivanets

ср, 5 січ. 2022, 21:15 користувач Richard W.M. Jones <rjones@redhat.com> пише:

On Wed, Jan 05, 2022 at 04:37:42PM +0100, Gottschalk wrote:
> Hi Rich,
>
> i wish you a happy new year and health.
>
> We made a recovery from a VMware VM with a Windows 2019 Server.
>
> Guestfish lists a filesystem ReFs which is not mountable in guestfish version
> 1.36..13.
>
> We are using a Ubuntu 18.04.6 LTS Operating System.
>
> ><fs> add file034000.vmdk file034000_1.vmdk
> add: unknown optional argument "file034000_1.vmdk"
> ><fs> add file034000.vmdk
> ><fs> add file034000_1.vmdk
> ><fs> run
>  100%
> ⟦▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒⟧
> 00:00
> ><fs> list-filesystems
> /dev/sda1: ntfs
> /dev/sda2: vfat
> /dev/sda3: unknown
> /dev/sda4: ntfs
> /dev/sda5: unknown
> /dev/sdb1: unknown
> /dev/sdb2: ReFS
> /dev/sdb3: unknown
> ><fs> mount /dev/sdb2 /
> libguestfs: error: mount: /dev/sdb2 on / (options: ''): mount: /sysroot:
> unknown filesystem type 'ReFS'.
> ><fs> 
>
> Have you any idea?

Sadly no one to my knowledge has written a ReFS driver for Linux at
all.  If you can find one it should be possible (in fact, easy) to
make libguestfs use it, but without one it's not possible as far as I
know.

Rich.

--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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