$ git clone -n https://src.fedoraproject.org/rpms/python-pyrad.git /var/lib/mock/f42-build-3490689-45854/root/chroot_tmpdir/scmroot/python-pyrad
Cloning into '/var/lib/mock/f42-build-3490689-45854/root/chroot_tmpdir/scmroot/python-pyrad'...
$ git fetch origin b350d1e4b32ba1c47e7d098e14c4bee12508ced0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pyrad
 * [new ref]         b350d1e4b32ba1c47e7d098e14c4bee12508ced0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b350d1e F41+: Use the provisional declarative buildsystem