$ git clone -n https://src.fedoraproject.org/rpms/python-pyrfc3339.git /var/lib/mock/f45-build-32387-659/root/chroot_tmpdir/scmroot/python-pyrfc3339
Cloning into '/var/lib/mock/f45-build-32387-659/root/chroot_tmpdir/scmroot/python-pyrfc3339'...
$ git fetch origin b06fd96300cb01290742495cce79a7798b588c2f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pyrfc3339
 * [new ref]         b06fd96300cb01290742495cce79a7798b588c2f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b06fd96 Update to 2.1.0