Libguestfs - Oct 2016 - mount: unknown filesystem type 'exfat'

Hello,

Can anyone please tell me whether guestfish can mount exFAT partitions?

I created a full disk image of a drive which contained a single exFAT partition.

Was able to mount it with kpartx/FUSE:

# kpartx -a -v disk.img 
add map loop0p1 (252:2): 0 39070078 linear 7:0 2
# mount /dev/mapper/loop0p1 /mnt -o ro
FUSE exfat 1.2.3
# ls /mnt
foo bar baz etc

but not guestfish:

$ sudo apt install libguestfs-tools

$ guestfish --version
guestfish 1.32.2

$ guestfish -a disk.img 
...
><fs> run
...
><fs> list-filesystems 
/dev/sda1: exfat
><fs> mount /dev/sda1 /
libguestfs: error: mount: /dev/sda1 on / (options: ''): mount: unknown
filesystem type 'exfat'
><fs> q
Results identical under both Linux Mint 18 and Fedora 24 (which was running a
slightly newer version of guestfish, 1.34.2).

Sincerely,

Miles

P.S. I read about installing libguestfs-winsupport for NTFS in the FAQ, but it
appears to only be for RHEL:
https://access.redhat.com/discussions/623573#comment-595723

On Sat, Oct 01, 2016 at 08:56:16PM -1000, Miles Wolbe
wrote:
> Hello,
> 
> Can anyone please tell me whether guestfish can mount exFAT partitions?
> 
> I created a full disk image of a drive which contained a single exFAT
partition.
guestfish or libguestfs don't support filesystems.  It's whatever
is supported by the kernel.

exFAT is apparently not supported by the Linux kernel, but there is a
FUSE driver for it called exfat-fuse (as you found out).

So if you add exfat-fuse and maybe exfat-utils to the appliance,
it should work, ie:

  # echo exfat-fuse   > /usr/lib*/guestfs/supermin.d/zz-exfat
  # echo exfat-utils >> /usr/lib*/guestfs/supermin.d/zz-exfat

(Note the package names might be different.  Apparently in RPMfusion
it's called fuse-exfat.)

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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> On Oct 2, 2016, at 02:27, Richard W.M. Jones <rjones@redhat.com>
wrote:
> 
> guestfish or libguestfs don't support filesystems.  It's whatever
> is supported by the kernel.
> 
> exFAT is apparently not supported by the Linux kernel, but there is a
> FUSE driver for it called exfat-fuse (as you found out).
> 
> So if you add exfat-fuse and maybe exfat-utils to the appliance,
> it should work, ie:
> 
>  # echo exfat-fuse   > /usr/lib*/guestfs/supermin.d/zz-exfat
>  # echo exfat-utils >> /usr/lib*/guestfs/supermin.d/zz-exfat
> 
> (Note the package names might be different.  Apparently in RPMfusion
> it's called fuse-exfat.)
Awesome! Thanks very much Rich. That worked perfectly!

In Fedora 24 x64:

# echo fuse-exfat > /usr/lib64/guestfs/supermin.d/zz-exfat
# echo exfat-utils >> /usr/lib64/guestfs/supermin.d/zz-exfat

In Linux Mint 18 x64:

# echo exfat-fuse > /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zz-exfat
# echo exfat-utils >>
/usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zz-exfat

$ guestfish -a disk.img 
><fs> run
><fs> list-filesystems 
/dev/sda1: exfat
><fs> mount /dev/sda1 /
><fs> ls /
foo
bar
baz
etc

Gratefully,

Miles