$ git clone -n https://gitee.com/src-opencloudos-rpms/mesa-demos.git /var/lib/mock/dist-oc9-build-47268-14592/root/chroot_tmpdir/scmroot/mesa-demos
Cloning into '/var/lib/mock/dist-oc9-build-47268-14592/root/chroot_tmpdir/scmroot/mesa-demos'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/mesa-demos
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b0b403a import mesa-demos-8.4.0-3.20210504git0f9e7d9.tl4