wd='julia-nix-workdir'
mkdir -p $wd

cd $wd
git clone --depth=1 git@github.com:JuliaLang/METADATA.jl.git

while read url; do
  git clone --depth=1 $url
done < $(find ./METADATA.jl/ -name url -exec cat '{}' \; -exec echo \; |sort -u)