$ git clone -n https://gitee.com/src-opencloudos-rpms/libunwind.git /var/lib/mock/dist-oc9-build-42631-14591/root/chroot_tmpdir/scmroot/libunwind
Cloning into '/var/lib/mock/dist-oc9-build-42631-14591/root/chroot_tmpdir/scmroot/libunwind'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libunwind
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b2f463 import libunwind-1.6.2-5.tl4