$ git clone -n https://src.fedoraproject.org/rpms/libserialport.git /var/lib/mock/f41-build-side-1-2645456-27102/root/chroot_tmpdir/scmroot/libserialport
Cloning into '/var/lib/mock/f41-build-side-1-2645456-27102/root/chroot_tmpdir/scmroot/libserialport'...
$ git fetch origin b8d70f8969970a5aca213863200ffdb82827bee6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libserialport
 * [new ref]         b8d70f8969970a5aca213863200ffdb82827bee6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b8d70f8 convert license to SPDX