$ git clone -n https://src.fedoraproject.org/rpms/python-josepy.git /var/lib/mock/f45-build-31214-651/root/chroot_tmpdir/scmroot/python-josepy
Cloning into '/var/lib/mock/f45-build-31214-651/root/chroot_tmpdir/scmroot/python-josepy'...
$ git fetch origin f734362bcfc3995fa90b2c0ede1805c4faa69c8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-josepy
 * [new ref]         f734362bcfc3995fa90b2c0ede1805c4faa69c8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f734362 Update to 2.2.0