$ git clone -n https://gitee.com/src-opencloudos-rpms/libplacebo.git /var/lib/mock/dist-oc9-epol-build-54493-14768/root/chroot_tmpdir/scmroot/libplacebo
Cloning into '/var/lib/mock/dist-oc9-epol-build-54493-14768/root/chroot_tmpdir/scmroot/libplacebo'...
$ git fetch origin oc9:KOJI_FETCH_HEAD
From https://gitee.com/src-opencloudos-rpms/libplacebo
 * [new branch]      oc9        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b06b370 import libplacebo-5.264.1-2.tl4