$ git clone -n https://src.fedoraproject.org/rpms/nest.git /var/lib/mock/f40-build-735388-106342/root/chroot_tmpdir/scmroot/nest
Cloning into '/var/lib/mock/f40-build-735388-106342/root/chroot_tmpdir/scmroot/nest'...
$ git fetch origin ef611010765a7e3e37911e3f42d678968e882510:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/nest
 * [new ref]         ef611010765a7e3e37911e3f42d678968e882510 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef61101 feat: update to 3.4 (fixes rhbz#2162490)