$ git clone -n https://src.fedoraproject.org/rpms/python-xnat.git /var/lib/mock/f42-build-side-1-3584376-46893/root/chroot_tmpdir/scmroot/python-xnat
Cloning into '/var/lib/mock/f42-build-side-1-3584376-46893/root/chroot_tmpdir/scmroot/python-xnat'...
$ git fetch origin e2aca9ce2f40ba82d488cbe30e22bac7d727c5c2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-xnat
 * [new ref]         e2aca9ce2f40ba82d488cbe30e22bac7d727c5c2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2aca9c Run tests requiring xnat4tests