$ git clone -n https://gitee.com/src-opencloudos-rpms/postfix.git /var/lib/mock/dist-oc9-build-122968-72598/root/chroot_tmpdir/scmroot/postfix
Cloning into '/var/lib/mock/dist-oc9-build-122968-72598/root/chroot_tmpdir/scmroot/postfix'...
$ git fetch origin fa1749c58f0b0d1e942bdd1f85ee8aa1c341212d:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/postfix
 * [new ref]         fa1749c58f0b0d1e942bdd1f85ee8aa1c341212d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fa1749c import postfix-3.8.5-4.tl4