$ git clone -n https://src.fedoraproject.org/rpms/polkit-kde.git /var/lib/mock/f41-build-824586-154180/root/chroot_tmpdir/scmroot/polkit-kde
Cloning into '/var/lib/mock/f41-build-824586-154180/root/chroot_tmpdir/scmroot/polkit-kde'...
$ git fetch origin 6e14eefe98e6895918cdcdf9a0eb92c287178f8d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polkit-kde
 * [new ref]         6e14eefe98e6895918cdcdf9a0eb92c287178f8d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e14eef rebuild