$ git clone -n https://src.fedoraproject.org/rpms/python-xvfbwrapper.git /var/lib/mock/f45-build-33755-674/root/chroot_tmpdir/scmroot/python-xvfbwrapper
Cloning into '/var/lib/mock/f45-build-33755-674/root/chroot_tmpdir/scmroot/python-xvfbwrapper'...
$ git fetch origin bfe42939f8b7144e205f3bec3c4c4b7873234f35:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-xvfbwrapper
 * [new ref]         bfe42939f8b7144e205f3bec3c4c4b7873234f35 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bfe4293 Update to 0.2.34 (#2534201)