$ git clone -n https://src.fedoraproject.org/rpms/ghostwriter.git /var/lib/mock/f42-build-881221-183509/root/chroot_tmpdir/scmroot/ghostwriter
Cloning into '/var/lib/mock/f42-build-881221-183509/root/chroot_tmpdir/scmroot/ghostwriter'...
$ git fetch origin c764596b70b88b1b007334739a700fde46f99bc4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghostwriter
 * [new ref]         c764596b70b88b1b007334739a700fde46f99bc4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c764596 Rebuild for ppc64le enablement