$ git clone -n https://src.fedoraproject.org/rpms/cjs.git /var/lib/mock/f39-build-2215077-52410/root/chroot_tmpdir/scmroot/cjs
Cloning into '/var/lib/mock/f39-build-2215077-52410/root/chroot_tmpdir/scmroot/cjs'...
$ git fetch origin 941921617a1360b45a3304984a3fbf63034ae844:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cjs
 * [new ref]         941921617a1360b45a3304984a3fbf63034ae844 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9419216 Update to 6.0.0 release