$ git clone -n https://src.fedoraproject.org/rpms/python-justbases.git /var/lib/mock/f45-build-31230-651/root/chroot_tmpdir/scmroot/python-justbases
Cloning into '/var/lib/mock/f45-build-31230-651/root/chroot_tmpdir/scmroot/python-justbases'...
$ git fetch origin b1ccf33e69300368b5fd1ce25a5be556e48fd6ba:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-justbases
 * [new ref]         b1ccf33e69300368b5fd1ce25a5be556e48fd6ba -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1ccf33 Update to 0.15.3