initial commit

nix/dbuild.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv, buildMavenRepositoryFromLockFile
+, makeWrapper, maven, jdk11_headless
+, nix-gitignore
+}:
+
+
+let
+  mavenRepository = buildMavenRepositoryFromLockFile { file = ./mvn2nix-lock.json; };
+in stdenv.mkDerivation rec {
+  pname = "dBuild";
+  version = "0.0.1";
+  name = "${pname}-${version}";
+  src = nix-gitignore.gitignoreSource [ "*.nix" ] ./..;
+
+  nativeBuildInputs = [ jdk11_headless maven makeWrapper ];
+  buildPhase = ''
+    echo "Building with maven repository ${mavenRepository}"
+    mvn package --offline -Dmaven.repo.local=${mavenRepository}
+  '';
+
+  installPhase = ''
+    # create the bin directory
+    mkdir -p $out/bin
+
+    # create a symbolic link for the lib directory
+    ln -s ${mavenRepository} $out/lib
+
+    # copy out the JAR
+    # Maven already setup the classpath to use m2 repository layout
+    # with the prefix of lib/
+    cp target/${name}.jar $out/
+
+    # create a wrapper that will automatically set the classpath
+    # this should be the paths from the dependency derivation
+    makeWrapper ${jdk11_headless}/bin/java $out/bin/${pname} \
+          --add-flags "-jar $out/${name}.jar"
+  '';
+}

nix/overlay.nix

@@ -0,0 +1,3 @@
+final: prev: {
+  dbuild = final.callPackage ./dbuild.nix { };
+}