$ git clone -n https://gitee.com/src-opencloudos-rpms/libnbd.git /var/lib/mock/dist-oc9-build-46884-14592/root/chroot_tmpdir/scmroot/libnbd
Cloning into '/var/lib/mock/dist-oc9-build-46884-14592/root/chroot_tmpdir/scmroot/libnbd'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libnbd
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c02ce9 import libnbd-1.15.7-4.tl4