$ git clone -n https://gitee.com/wenyuzifang/fftw.git /var/lib/mock/dist-an23-build-469272-74027/root/chroot_tmpdir/scmroot/fftw
Cloning into '/var/lib/mock/dist-an23-build-469272-74027/root/chroot_tmpdir/scmroot/fftw'...
$ git fetch origin 4b51de8d9782aa91f5d2d5cc5ed3b9cdf9bd1f22:KOJI_FETCH_HEAD
From https://gitee.com/wenyuzifang/fftw
 * [new ref]         4b51de8d9782aa91f5d2d5cc5ed3b9cdf9bd1f22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b51de8 Update code from upstream