$ git clone -n https://src.fedoraproject.org/rpms/python-pyunicorn.git /var/lib/mock/f42-build-side-1-3583062-46887/root/chroot_tmpdir/scmroot/python-pyunicorn
Cloning into '/var/lib/mock/f42-build-side-1-3583062-46887/root/chroot_tmpdir/scmroot/python-pyunicorn'...
$ git fetch origin f8f47a32438062d05f3327c1f0521e66c75a4d0c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pyunicorn
 * [new ref]         f8f47a32438062d05f3327c1f0521e66c75a4d0c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8f47a3 Add Packit config