$ git clone -n https://src.fedoraproject.org/rpms/kwin.git /var/lib/mock/f40-build-788901-135456/root/chroot_tmpdir/scmroot/kwin
Cloning into '/var/lib/mock/f40-build-788901-135456/root/chroot_tmpdir/scmroot/kwin'...
$ git fetch origin 5153ce29b24b1611fc9bf5d0bdd11a35ea5d20e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kwin
 * [new ref]         5153ce29b24b1611fc9bf5d0bdd11a35ea5d20e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5153ce2 6.0.0