$ git clone -n https://src.fedoraproject.org/rpms/plasma-thunderbolt.git /var/lib/mock/f40-build-2511616-61712/root/chroot_tmpdir/scmroot/plasma-thunderbolt
Cloning into '/var/lib/mock/f40-build-2511616-61712/root/chroot_tmpdir/scmroot/plasma-thunderbolt'...
$ git fetch origin 594f98c6dc2b6158ddf60b3739c8111b17440db9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-thunderbolt
 * [new ref]         594f98c6dc2b6158ddf60b3739c8111b17440db9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 594f98c 6.0.1