$ git clone -n https://src.fedoraproject.org/rpms/ghc-statistics.git /var/lib/mock/f41-build-side-1-2883187-34500/root/chroot_tmpdir/scmroot/ghc-statistics
Cloning into '/var/lib/mock/f41-build-side-1-2883187-34500/root/chroot_tmpdir/scmroot/ghc-statistics'...
$ git fetch origin d935602a6cded8f3ca014a34a813507c4b9ec9fa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-statistics
 * [new ref]         d935602a6cded8f3ca014a34a813507c4b9ec9fa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d935602 update to 0.16.2.1