$ git clone -n https://src.fedoraproject.org/rpms/plasma-thunderbolt.git /var/lib/mock/f40-build-2486382-61645/root/chroot_tmpdir/scmroot/plasma-thunderbolt
Cloning into '/var/lib/mock/f40-build-2486382-61645/root/chroot_tmpdir/scmroot/plasma-thunderbolt'...
$ git fetch origin 0e56a6fd9d806dd372fcfb9c51c295f9a467c620:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-thunderbolt
 * [new ref]         0e56a6fd9d806dd372fcfb9c51c295f9a467c620 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e56a6f 6.0.0