$ git clone -n https://src.fedoraproject.org/rpms/grass.git /var/lib/mock/f40-build-2111114-50659/root/chroot_tmpdir/scmroot/grass
Cloning into '/var/lib/mock/f40-build-2111114-50659/root/chroot_tmpdir/scmroot/grass'...
$ git fetch origin 479fe227552c0e2759e7196b552f922ebdf37fb8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grass
 * [new ref]         479fe227552c0e2759e7196b552f922ebdf37fb8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 479fe22 Rebuild (gdal)