$ git clone -n https://gitee.com/fundawang/ffmpeg.git /var/lib/mock/dist-an23-epao-build-347921-70387/root/chroot_tmpdir/scmroot/ffmpeg
Cloning into '/var/lib/mock/dist-an23-epao-build-347921-70387/root/chroot_tmpdir/scmroot/ffmpeg'...
$ git fetch origin 87b485fa730a74a3a973921081cb1f454dc3e0da:KOJI_FETCH_HEAD
From https://gitee.com/fundawang/ffmpeg
 * [new ref]         87b485fa730a74a3a973921081cb1f454dc3e0da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87b485f Cleanup spec