Creates nix file from composer.lock

composer2nix.nix

{ pkgs ? import <nixpkgs> {}, file ? ./composer.lock }:

with pkgs.lib;

let
  deps =  builtins.fromJSON (builtins.readFile file);

in pkgs.stdenv.mkDerivation {
  __noChroot = true;
  name = "composer2nix";
  impureEnvVars = [
    "http_proxy" "https_proxy" "ftp_proxy" "all_proxy" "no_proxy"
  ];

  buildInputs = [pkgs.curl];
  CURL_CA_BUNDLE="${pkgs.cacert}/etc/ca-bundle.crt";

  buildCommand = ''
    echo "[" > $out
    ${concatMapStrings (p: ''
      echo "{" >> $out
      echo "  name=\"${p.name}\";" >> $out
      echo "  src=\"${p.dist.url}\";" >> $out
      echo "  sha256=\"$(curl -L ${p.dist.url} | sha256sum | cut -d ' ' -f 1)\";" >> $out
      echo "  reference=\"${p.dist.reference}\";" >> $out
      echo "  type=\"${p.dist.type}\";" >> $out
      echo "}" >> $out
    '') deps.packages}
    echo "]" >> $out
  '';
}