$ git clone -n https://gitee.com/opencloudos-stream/ffmpeg.git /var/lib/mock/dist-oc9-epol-build-73831-49128/root/chroot_tmpdir/scmroot/ffmpeg
Cloning into '/var/lib/mock/dist-oc9-epol-build-73831-49128/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 9270edd !19 [I9OWZO]:Rebuild for dav1d in opencloudos-stream Merge pull request !19 from ocs-bot/master