$ git clone -n https://src.fedoraproject.org/rpms/polkit-kde.git /var/lib/mock/f40-build-788754-135315/root/chroot_tmpdir/scmroot/polkit-kde
Cloning into '/var/lib/mock/f40-build-788754-135315/root/chroot_tmpdir/scmroot/polkit-kde'...
$ git fetch origin 58809404feed38c95d4cf5cbe3f995db3fc3397b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polkit-kde
 * [new ref]         58809404feed38c95d4cf5cbe3f995db3fc3397b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5880940 6.0.0