$ git clone -n https://src.fedoraproject.org/rpms/polari.git /var/lib/mock/f40-build-2088935-50193/root/chroot_tmpdir/scmroot/polari
Cloning into '/var/lib/mock/f40-build-2088935-50193/root/chroot_tmpdir/scmroot/polari'...
$ git fetch origin 1820232157f0e7fc8ec5744b40c19a24be6764ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polari
 * [new ref]         1820232157f0e7fc8ec5744b40c19a24be6764ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1820232 Update to 45.0