$ git clone -n https://src.fedoraproject.org/rpms/polkit.git /var/lib/mock/f39-build-1987635-43353/root/chroot_tmpdir/scmroot/polkit
Cloning into '/var/lib/mock/f39-build-1987635-43353/root/chroot_tmpdir/scmroot/polkit'...
$ git fetch origin 51034a0a42109fd3b63d5310f5411afe0c3a6b43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polkit
 * [new ref]         51034a0a42109fd3b63d5310f5411afe0c3a6b43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 51034a0 fix upstream CI disrupted by sysusers