$ git clone -n https://gitee.com/opencloudos-stream/ffmpeg.git /var/lib/mock/dist-ocs23-build-161027-10115/root/chroot_tmpdir/scmroot/ffmpeg
Cloning into '/var/lib/mock/dist-ocs23-build-161027-10115/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 c3d2206 !18 Upgrade to version 7.0 fixing CVEs in 6.1. Merge pull request !18 from cunshunxia/master