$ git clone -n https://src.fedoraproject.org/rpms/polkit-kde.git /var/lib/mock/f42-build-862549-170850/root/chroot_tmpdir/scmroot/polkit-kde
Cloning into '/var/lib/mock/f42-build-862549-170850/root/chroot_tmpdir/scmroot/polkit-kde'...
$ git fetch origin 5789c0efc4df0779fedfd41be28e7e7e6595ab77:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polkit-kde
 * [new ref]         5789c0efc4df0779fedfd41be28e7e7e6595ab77 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5789c0e 6.2.4