$ git clone -n https://gitee.com/opencloudos-stream/postfix.git /var/lib/mock/dist-ocs23-build-90806-5984/root/chroot_tmpdir/scmroot/postfix
Cloning into '/var/lib/mock/dist-ocs23-build-90806-5984/root/chroot_tmpdir/scmroot/postfix'...
$ git fetch origin HEAD:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/postfix
 * [new ref]         HEAD       -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ebe6ab Rebuilt for OpenCloudOS Stream 23.09