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path: root/nixpkgs/pkgs/build-support/dotnet/make-nuget-source/default.nix
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{ lib, python3, stdenvNoCC }:

{ name
, description ? ""
, deps ? []
}:

let
  nuget-source = stdenvNoCC.mkDerivation {
    inherit name;

    nativeBuildInputs = [ python3 ];

    buildCommand = ''
      mkdir -p $out/{lib,share}

      # use -L to follow symbolic links. When `projectReferences` is used in
      # buildDotnetModule, one of the deps will be a symlink farm.
      find -L ${lib.concatStringsSep " " deps} -type f -name '*.nupkg' -exec \
        ln -s '{}' -t $out/lib ';'

      # Generates a list of all licenses' spdx ids, if available.
      # Note that this currently ignores any license provided in plain text (e.g. "LICENSE.txt")
      python ${./extract-licenses-from-nupkgs.py} $out/lib > $out/share/licenses
    '';

    meta.description = description;
  } // { # We need data from `$out` for `meta`, so we have to use overrides as to not hit infinite recursion.
    meta = nuget-source.meta // {
      licenses = let
        # TODO: avoid IFD
        depLicenses = lib.splitString "\n" (builtins.readFile "${nuget-source}/share/licenses");
      in lib.flatten (lib.forEach depLicenses (spdx:
        lib.optionals (spdx != "") (lib.getLicenseFromSpdxId spdx)
      ));
    };
  };
in nuget-source