$ git clone -n https://src.fedoraproject.org/rpms/polkit.git /var/lib/mock/f42-build-side-1-3584388-46893/root/chroot_tmpdir/scmroot/polkit
Cloning into '/var/lib/mock/f42-build-side-1-3584388-46893/root/chroot_tmpdir/scmroot/polkit'...
$ git fetch origin 67c2049165a37658cc57c69147d1507d9de501fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polkit
 * [new ref]         67c2049165a37658cc57c69147d1507d9de501fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67c2049 Fix crash caused by nested XML .policy files