$ git clone -n https://gitee.com/zhoujiajia111/ffmpeg.git /var/lib/mock/dist-an23-dde-build-429954-73007/root/chroot_tmpdir/scmroot/ffmpeg
Cloning into '/var/lib/mock/dist-an23-dde-build-429954-73007/root/chroot_tmpdir/scmroot/ffmpeg'...
$ git fetch origin 2e4bda61e5eb096425e66d05f9ba0e0bf0c259f2:KOJI_FETCH_HEAD
From https://gitee.com/zhoujiajia111/ffmpeg
 * [new ref]         2e4bda61e5eb096425e66d05f9ba0e0bf0c259f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e4bda6 update ffmpeg.spec.