$ git clone -n https://src.fedoraproject.org/rpms/plasma-thunderbolt.git /var/lib/mock/f40-build-2160779-50941/root/chroot_tmpdir/scmroot/plasma-thunderbolt
Cloning into '/var/lib/mock/f40-build-2160779-50941/root/chroot_tmpdir/scmroot/plasma-thunderbolt'...
$ git fetch origin a6afd2c2c8ee25928dea3d6e03c87fbf1b0275a3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-thunderbolt
 * [new ref]         a6afd2c2c8ee25928dea3d6e03c87fbf1b0275a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a6afd2c 5.91.0