$ git clone -n https://gitee.com/opencloudos-stream/ffmpeg.git /var/lib/mock/dist-ocs23-build-182254-12189/root/chroot_tmpdir/scmroot/ffmpeg
Cloning into '/var/lib/mock/dist-ocs23-build-182254-12189/root/chroot_tmpdir/scmroot/ffmpeg'...
$ git fetch origin master:KOJI_FETCH_HEAD
From https://gitee.com/opencloudos-stream/ffmpeg
 * [new branch]      master     -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cb3a035 !20 [IA66WS]:Rebuild for libvpx in opencloudos-stream Merge pull request !20 from ocs-bot/master