$ git clone -n https://gitee.com/wency_cn/libblockdev.git /var/lib/mock/dist-an23-build-502137-74794/root/chroot_tmpdir/scmroot/libblockdev
Cloning into '/var/lib/mock/dist-an23-build-502137-74794/root/chroot_tmpdir/scmroot/libblockdev'...
$ git fetch origin 38c518e9ec5f6a2983d42ed530ef053571c9665c:KOJI_FETCH_HEAD
From https://gitee.com/wency_cn/libblockdev
 * [new ref]         38c518e9ec5f6a2983d42ed530ef053571c9665c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38c518e Update code from upstream