$ git clone -n https://gitee.com/wency_cn/postfix_1769677800.git /var/lib/mock/dist-an23-build-509919-75048/root/chroot_tmpdir/scmroot/postfix_1769677800
Cloning into '/var/lib/mock/dist-an23-build-509919-75048/root/chroot_tmpdir/scmroot/postfix_1769677800'...
$ git fetch origin 4520e292c3f698b23857fde8f2902deb6fb9b9d2:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/postfix_1769677800
 * [new ref]         4520e292c3f698b23857fde8f2902deb6fb9b9d2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4520e29 Update code from upstream