$ git clone -n https://src.fedoraproject.org/rpms/m17n-db.git /var/lib/mock/f42-build-side-1-3499404-45964/root/chroot_tmpdir/scmroot/m17n-db
Cloning into '/var/lib/mock/f42-build-side-1-3499404-45964/root/chroot_tmpdir/scmroot/m17n-db'...
$ git fetch origin 4197a41dd79f641777aea6b0fc7f68f10edae74b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/m17n-db
 * [new ref]         4197a41dd79f641777aea6b0fc7f68f10edae74b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4197a41 Update to 1.8.10