$ git clone -n https://src.fedoraproject.org/rpms/pypy.git /var/lib/mock/f41-build-side-1-2975213-35838/root/chroot_tmpdir/scmroot/pypy
Cloning into '/var/lib/mock/f41-build-side-1-2975213-35838/root/chroot_tmpdir/scmroot/pypy'...
$ git fetch origin ae1071acc77e27e4aa6c5de3b1e1d56ca20df6e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pypy
 * [new ref]         ae1071acc77e27e4aa6c5de3b1e1d56ca20df6e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ae1071a Update to 7.3.17