Access to qcow images is denied`

[rmohr]

When building a VM vocker can't access the downloaded images because it tries to access it with the qemu user but the images are stored in the home directory of a user with the according permissions:

RAN: '/bin/virt-builder --format=qcow2 -o /root/.cache/vocker/images/fedora-23.qcow2 fedora-23'

  STDOUT:
[   1.9] Downloading: http://libguestfs.org/download/builder/fedora-23.xz
[   2.5] Planning how to build this image
[   2.5] Uncompressing
[  15.9] Converting raw to qcow2
[  25.2] Opening the new disk


  STDERR:
virt-builder: error: libguestfs error: could not create appliance through 
libvirt.

Try running qemu directly without libvirt using this environment variable:
export LIBGUESTFS_BACKEND=direct

Original error from libvirt: Cannot access storage file 
'/root/.cache/vocker/images/fedora-23.qcow2' (as uid:107, gid:107): 
Permission denied [code=38 int1=13]

[rmohr]

Seems to be selinux related