$ git clone -n https://src.fedoraproject.org/rpms/ghc-cborg.git /var/lib/mock/f38-build-side-42-init-devel-614383-26309/root/chroot_tmpdir/scmroot/ghc-cborg
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-614383-26309/root/chroot_tmpdir/scmroot/ghc-cborg'...
$ git fetch origin 7a42e0d97dac6a3dced802df77f6af3ce131d55c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cborg
 * [new ref]         7a42e0d97dac6a3dced802df77f6af3ce131d55c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a42e0d update to newer 32bit issue