licenses: Update license.nix to work with new enterprise derivation.

license.nix

@@ -1,163 +1,160 b''
 # Utility to generate the license information
 #
 # Usage:
 #
 #   nix-build -I ~/dev license.nix -A result
 #
 # Afterwards ./result will contain the license information as JSON files.
 #
 #
 # Overview
 #
 # Uses two steps to get the relevant license information:
 #
 # 1. Walk down the derivations based on "buildInputs" and
 #    "propagatedBuildInputs". This results in all dependencies based on the nix
 #    declartions.
 #
 # 2. Build Enterprise and query nix-store to get a list of runtime
 #    dependencies. The results from step 1 are then limited to the ones which
 #    are in this list.
 #
 # The result is then available in ./result/license.json.
 #
 
 
 let
 
   nixpkgs = import <nixpkgs> {};
 
   stdenv = nixpkgs.stdenv;
 
   # Enterprise as simple as possible, goal here is just to identify the runtime
   # dependencies. Ideally we could avoid building Enterprise at all and somehow
   # figure it out without calling into nix-store.
   enterprise = import ./default.nix {
     doCheck = false;
-    with_vcsserver = false;
-    with_pyramid = false;
-    cythonize = false;
   };
 
   # For a given derivation, return the list of all dependencies
   drvToDependencies = drv: nixpkgs.lib.flatten [
     drv.nativeBuildInputs or []
     drv.propagatedNativeBuildInputs or []
   ];
 
   # Transform the given derivation into the meta information which we need in
   # the resulting JSON files.
   drvToMeta = drv: {
     name = drv.name or "UNNAMED";
     license = if drv ? meta.license then drv.meta.license else "UNKNOWN";
   };
 
   # Walk the tree of buildInputs and propagatedBuildInputs and return it as a
   # flat list.  Duplicates are avoided.
   listDrvDependencies = drv: let
     addElement = element: seen:
       if (builtins.elem element seen)
       then seen
       else let
         newSeen = seen ++ [ element ];
         newDeps = drvToDependencies element;
       in nixpkgs.lib.fold addElement newSeen newDeps;
     initialElements = drvToDependencies drv;
   in nixpkgs.lib.fold addElement [] initialElements;
 
   # Reads in a file with store paths and returns a list of derivation names.
   #
   # Reads the file, splits the lines, then removes the prefix, so that we
   # end up with a list of derivation names in the end.
   storePathsToDrvNames = srcPath: let
     rawStorePaths = nixpkgs.lib.removeSuffix "\n" (
       builtins.readFile srcPath);
     storePaths = nixpkgs.lib.splitString "\n" rawStorePaths;
     # TODO: johbo: Would be nice to use some sort of utility here to convert
     # the path to a derivation name.
     storePathPrefix = (
       builtins.stringLength "/nix/store/zwy7aavnif9ayw30rya1k6xiacafzzl6-");
     storePathToName = path:
       builtins.substring storePathPrefix (builtins.stringLength path) path;
   in (map storePathToName storePaths);
 
 in rec {
 
   # Build Enterprise and call nix-store to retrieve the runtime
   # dependencies. The result is available in the nix store.
   runtimeDependencies = stdenv.mkDerivation {
     name = "runtime-dependencies";
     buildInputs = [
       # Needed to query the store
       nixpkgs.nix
     ];
     unpackPhase = ''
       echo "Nothing to unpack"
     '';
     buildPhase = ''
       # Get a list of runtime dependencies
       nix-store -q --references ${enterprise} > nix-store-references
     '';
     installPhase = ''
       mkdir -p $out
       cp -v nix-store-references $out/
     '';
   };
 
   # Produce the license overview files.
   result = let
 
     # Dependencies according to the nix-store
     runtimeDependencyNames = (
       storePathsToDrvNames "${runtimeDependencies}/nix-store-references");
 
     # Dependencies based on buildInputs and propagatedBuildInputs
     enterpriseAllDependencies = listDrvDependencies enterprise;
     enterpriseRuntimeDependencies = let
       elemName = element: element.name or "UNNAMED";
       isRuntime = element: builtins.elem (elemName element) runtimeDependencyNames;
     in builtins.filter isRuntime enterpriseAllDependencies;
 
     # Extract relevant meta information
     enterpriseAllLicenses = map drvToMeta enterpriseAllDependencies;
     enterpriseRuntimeLicenses = map drvToMeta enterpriseRuntimeDependencies;
 
   in stdenv.mkDerivation {
 
     name = "licenses";
 
     buildInputs = [];
 
     unpackPhase = ''
       echo "Nothing to unpack"
     '';
 
     buildPhase = ''
       mkdir build
 
       # Copy list of runtime dependencies for the Python processor
       cp "${runtimeDependencies}/nix-store-references" ./build/nix-store-references
 
       # All licenses which we found by walking buildInputs and
       # propagatedBuildInputs
       cat > build/all-licenses.json <<EOF
       ${builtins.toJSON enterpriseAllLicenses}
       EOF
 
       # License information for our runtime dependencies only. Basically all
       # licenses limited to the items which where also reported by nix-store as
       # a dependency.
       cat > build/licenses.json <<EOF
       ${builtins.toJSON enterpriseRuntimeLicenses}
       EOF
     '';
 
     installPhase = ''
       mkdir -p $out
 
       # Store it all, that helps when things go wrong
       cp -rv ./build/* $out
     '';
   };
 
 }