$ git clone -n https://gitee.com/mgb01105731/ffmpeg_1.git /var/lib/mock/dist-an23-epao-build-426566-72996/root/chroot_tmpdir/scmroot/ffmpeg_1
Cloning into '/var/lib/mock/dist-an23-epao-build-426566-72996/root/chroot_tmpdir/scmroot/ffmpeg_1'...
$ git fetch origin a23:KOJI_FETCH_HEAD
From https://gitee.com/mgb01105731/ffmpeg_1
 * [new branch]      a23        -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7bb7170 Rebuild with new libvpx