$ git clone -n https://gitee.com/src-opencloudos-rpms/potrace.git /var/lib/mock/dist-oc9-build-47664-14592/root/chroot_tmpdir/scmroot/potrace
Cloning into '/var/lib/mock/dist-oc9-build-47664-14592/root/chroot_tmpdir/scmroot/potrace'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/potrace
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e888fd import potrace-1.16-3.tl4