$ git clone -n https://gitee.com/zhoujiajia111/libtheora.git /var/lib/mock/dist-an23.2-build-429402-73017/root/chroot_tmpdir/scmroot/libtheora
Cloning into '/var/lib/mock/dist-an23.2-build-429402-73017/root/chroot_tmpdir/scmroot/libtheora'...
$ git fetch origin b4201f5e80f2d0e5a4133db61825a6428c911b16:KOJI_FETCH_HEAD
From https://gitee.com/zhoujiajia111/libtheora
 * [new ref]         b4201f5e80f2d0e5a4133db61825a6428c911b16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4201f5 update libtheora.spec.