$ git clone -n https://src.fedoraproject.org/rpms/ghc-statistics.git /var/lib/mock/f38-build-side-42-init-devel-1084409-29979/root/chroot_tmpdir/scmroot/ghc-statistics
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1084409-29979/root/chroot_tmpdir/scmroot/ghc-statistics'...
$ git fetch origin f7429386fda05c954d8f296166a9df2276d877b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-statistics
 * [new ref]         f7429386fda05c954d8f296166a9df2276d877b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f742938 update to 0.16.1.2