$ git clone -n https://src.fedoraproject.org/rpms/ansible.git /var/lib/mock/f42-build-side-1-3505956-45995/root/chroot_tmpdir/scmroot/ansible
Cloning into '/var/lib/mock/f42-build-side-1-3505956-45995/root/chroot_tmpdir/scmroot/ansible'...
$ git fetch origin 4cf3fd7e86bfc7eb15ce1a7d65a9e9da4fedbc78:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ansible
 * [new ref]         4cf3fd7e86bfc7eb15ce1a7d65a9e9da4fedbc78 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4cf3fd7 ansible-prep: remove old files