$ git clone -n https://src.fedoraproject.org/rpms/nest.git /var/lib/mock/f40-build-781288-131566/root/chroot_tmpdir/scmroot/nest
Cloning into '/var/lib/mock/f40-build-781288-131566/root/chroot_tmpdir/scmroot/nest'...
$ git fetch origin c6cf3b6d613d288851ee7cc14673f68676196138:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nest
 * [new ref]         c6cf3b6d613d288851ee7cc14673f68676196138 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6cf3b6 Add Packit config