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Description of problem:
Note this is when using the RHEL 7.1 preview packages from:
https://www.redhat.com/archives/libguestfs/2014-May/msg00090.html
It is NOT a bug in any released version of RHEL
 
Make xfs filesystem failed.

mkfs -t xfs -f /dev/sda1^M
mkfs.xfs: No such file or directory^M
guestfsd: error: xfs: /dev/sda1: mkfs.xfs: No such file or directory^M
guestfsd: main_loop: proc 278 (mkfs) took 0.00 seconds^M
libguestfs: trace: mkfs = -1 (error)
libguestfs: error: mkfs: xfs: /dev/sda1: mkfs.xfs: No such file or directory
guestfish: error creating prepared disk image 'fs:xfs' on 'test1.img': failed to create filesystem (xfs): mkfs: xfs: /dev/sda1: mkfs.xfs: No such file or directory


Version-Release number of selected component (if applicable):
libguestfs-1.27.22-1.3.el7.x86_64
supermin-5.1.9-1.1.el7.x86_64


How reproducible:
100%


Steps to Reproduce:
# guestfish -N fs:xfs
libguestfs: error: mkfs: xfs: /dev/sda1: mkfs.xfs: No such file or directory
guestfish: error creating prepared disk image 'fs:xfs' on 'test1.img': failed to create filesystem (xfs): mkfs: xfs: /dev/sda1: mkfs.xfs: No such file or directory

Do you have libguestfs-xfs installed?  See:

http://people.redhat.com/~rjones/libguestfs-RHEL-7.1-preview/

Starting with RHEL 7.1 you will have to install these subpackages
if you need the features:

          libguestfs-gfs2  adds Global Filesystem (GFS2) support
        libguestfs-rescue  enhances virt-rescue shell with more tools
         libguestfs-rsync  rsync to/from guest filesystems
           libguestfs-xfs  adds XFS support

(and libguestfs-winsupport obviously).

(In reply to Richard W.M. Jones from comment #1)
> Do you have libguestfs-xfs installed?  See:
> 
> http://people.redhat.com/~rjones/libguestfs-RHEL-7.1-preview/
> 
> Starting with RHEL 7.1 you will have to install these subpackages
> if you need the features:
> 
>           libguestfs-gfs2  adds Global Filesystem (GFS2) support
>         libguestfs-rescue  enhances virt-rescue shell with more tools
>          libguestfs-rsync  rsync to/from guest filesystems
>            libguestfs-xfs  adds XFS support
> 
> (and libguestfs-winsupport obviously).

Missed that package, it worked when I installed the subpackages. thanks

Most probably the mkfs action should check for the features, instead of just erroring out with "mkfs.XXX: No such file or directory".