Split out monlithic derivation into multiple files

pkgs/development/python-modules/skein/default.nix

@@ -1,93 +1,27 @@
-{ autoPatchelfHook
-, buildPythonPackage
-, coreutils
+{ buildPythonPackage
+, callPackage
 , fetchPypi
 , jre
 , lib
-, maven
-, protobuf
 , pythonPackages
 , stdenv
 }:
-
-buildPythonPackage rec {
+let
   pname = "skein";
   version = "0.8.0";
-
   src = fetchPypi {
     inherit pname version;
     sha256 = "0nb64p1hzshgi1kfc2jx1v9vn8b0wzs50460wfra3fsxh0ap66ab";
   };
-
-  skeinRepo = stdenv.mkDerivation rec {
-    name = "${pname}-${version}-maven-repo";
-
-    inherit src;
-
-    nativeBuildInputs = [ maven ] ++ lib.optional stdenv.isLinux autoPatchelfHook;
-
-    buildPhase = "";
-
-    installPhase = ''
-      mkdir -p $out
-
-      archs="${
-        if stdenv.isLinux
-        then "linux-x86_32 linux-x86_64"
-        else "osx-x86_64"
-      }"
-
-      for arch in $archs
-      do
-        mvn -Dmaven.repo.local=$out dependency:get -Dartifact=com.google.protobuf:protoc:3.0.0:exe:$arch
-        mvn -Dmaven.repo.local=$out dependency:get -Dartifact=io.grpc:protoc-gen-grpc-java:1.16.0:exe:$arch
-      done
-
-      if ${ lib.boolToString stdenv.isLinux }
-      then
-        autoPatchelf $out
-      fi
-
-      # We have to use maven package here as dependency:go-offline doesn't
-      # fetch every required jar.
-      mvn -f java/pom.xml -Dmaven.repo.local=$out package
-
-      rm $(find $out -name _remote.repositories)
-      rm $(find $out -name resolver-status.properties)
-    '';
-
-    outputHashMode = "recursive";
-    outputHashAlgo = "sha256";
-    outputHash = if stdenv.isLinux
-      then "12f0q3444qw6y4f6qsa9540a0fz4cgi844zzi8z1phqn3k4dnl6v"
-      else "0bjbwiv17cary1isxca0m2hsvgs1i5fh18z247h1hky73lnhbrz8";
-
-  } // lib.optionalAttrs stdenv.isLinux { dontAutoPatchelf = true; };
-
-  # skein wants to compile a .jar file for Hadoop interaction. We build
-  # it separately as otherwise mvn is called from setup.py and we have
-  # no good way to inject the repository in there.
-  skeinJar = stdenv.mkDerivation rec {
-    name = "${pname}-${version}.jar";
-
-    inherit src;
-
-    nativeBuildInputs = [ maven ];
-
-    buildPhase = ''
-      mvn --offline -f java/pom.xml package -Dmaven.repo.local="${skeinRepo}" -Dskein.version=${version} -Dversion=${version}
-    '';
-
-    installPhase = ''
-      # Making sure skein.jar exists skips the maven build in setup.py
-      mv java/target/skein-*.jar $out
-    '';
-  };
+  skeinJar = callPackage ./skeinjar.nix { inherit src version; };
+in
+buildPythonPackage rec {
+  inherit pname version src;
 
   propagatedBuildInputs = with pythonPackages; [ cryptography grpcio grpcio-tools jupyter pytest pyyaml requests jre ];
 
   preBuild = ''
-    # Making sure skein.jar exists skips the maven build in setup.py
+    # Ensure skein.jar exists skips the maven build in setup.py
     mkdir -p skein/java
     ln -s ${skeinJar} skein/java/skein.jar
   '';

pkgs/development/python-modules/skein/skeinjar.nix

@@ -0,0 +1,21 @@
+{ callPackage, stdenv, maven, src, version }:
+
+let
+  skeinRepo = callPackage ./skeinrepo.nix { inherit src version; };
+in
+stdenv.mkDerivation rec {
+  name = "skein-${version}.jar";
+
+  inherit src;
+
+  nativeBuildInputs = [ maven ];
+
+  buildPhase = ''
+    mvn --offline -f java/pom.xml package -Dmaven.repo.local="${skeinRepo}" -Dskein.version=${version} -Dversion=${version}
+  '';
+
+  installPhase = ''
+    # Making sure skein.jar exists skips the maven build in setup.py
+    mv java/target/skein-*.jar $out
+  '';
+}

pkgs/development/python-modules/skein/skeinrepo.nix

@@ -0,0 +1,46 @@
+{ autoPatchelfHook, lib, maven, stdenv, src, version }:
+
+stdenv.mkDerivation rec {
+  name = "skein-${version}-maven-repo";
+
+  inherit src;
+
+  nativeBuildInputs = [ maven ] ++ lib.optional stdenv.isLinux autoPatchelfHook;
+
+  doBuild = false;
+
+  installPhase = ''
+    mkdir -p $out
+
+    archs="${
+      if stdenv.isLinux
+      then "linux-x86_32 linux-x86_64"
+      else "osx-x86_64"
+    }"
+
+    for arch in $archs
+    do
+      mvn -Dmaven.repo.local=$out dependency:get -Dartifact=com.google.protobuf:protoc:3.0.0:exe:$arch
+      mvn -Dmaven.repo.local=$out dependency:get -Dartifact=io.grpc:protoc-gen-grpc-java:1.16.0:exe:$arch
+    done
+
+    if ${ lib.boolToString stdenv.isLinux }
+    then
+      autoPatchelf $out
+    fi
+
+    # We have to use maven package here as dependency:go-offline doesn't
+    # fetch every required jar.
+    mvn -f java/pom.xml -Dmaven.repo.local=$out package
+
+    rm $(find $out -name _remote.repositories)
+    rm $(find $out -name resolver-status.properties)
+  '';
+
+  outputHashMode = "recursive";
+  outputHashAlgo = "sha256";
+  outputHash = if stdenv.isLinux
+    then "12f0q3444qw6y4f6qsa9540a0fz4cgi844zzi8z1phqn3k4dnl6v"
+    else "0bjbwiv17cary1isxca0m2hsvgs1i5fh18z247h1hky73lnhbrz8";
+
+} // lib.optionalAttrs stdenv.isLinux { dontAutoPatchelf = true; }