$ git clone -n https://src.fedoraproject.org/rpms/python-rx.git /var/lib/mock/f45-build-32864-664/root/chroot_tmpdir/scmroot/python-rx
Cloning into '/var/lib/mock/f45-build-32864-664/root/chroot_tmpdir/scmroot/python-rx'...
$ git fetch origin d0e6057532264e1db711737af993b1212e6bf585:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-rx
 * [new ref]         d0e6057532264e1db711737af993b1212e6bf585 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0e6057 5.1.0