$ git clone -n https://src.fedoraproject.org/rpms/bletchmame.git /var/lib/mock/f38-build-side-42-init-devel-1333231-30693/root/chroot_tmpdir/scmroot/bletchmame
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1333231-30693/root/chroot_tmpdir/scmroot/bletchmame'...
$ git fetch origin 20451d9cb61039bc436e088bd0f341298feec531:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bletchmame
 * [new ref]         20451d9cb61039bc436e088bd0f341298feec531 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20451d9 Refresh upstream patches