$ git clone -n https://gitee.com/wency_cn/libnbd.git /var/lib/mock/dist-an23-build-503654-74854/root/chroot_tmpdir/scmroot/libnbd
Cloning into '/var/lib/mock/dist-an23-build-503654-74854/root/chroot_tmpdir/scmroot/libnbd'...
$ git fetch origin 6e1a3e4f9de128f59e8531ec276c5dc4eccaf5a7:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/libnbd
 * [new ref]         6e1a3e4f9de128f59e8531ec276c5dc4eccaf5a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6e1a3e4 Update code from upstream