Build support

pkgs/development/java-modules/build-maven-package.nix

@@ -0,0 +1,26 @@
+{ stdenv, maven, lib }:
+{ mavenDeps, src, name, meta, m2Path, ... }:
+
+with builtins;
+with lib;
+
+stdenv.mkDerivation rec {
+  inherit mavenDeps src name meta m2Path;
+
+  flatDeps = flatten mavenDeps;
+
+  propagatedBuildInput = [ maven ] ++ flatDeps;
+
+  find = ''find ${foldl' (x: y: x + " " + y) "" (map (x: x + "/m2/") flatDeps)} -type d -printf '%P\n' | xargs -I {} mkdir -p $out/m2/{}'';
+  copy = ''cp -rs ${foldl' (x: y: x + " " + y) "" (map (x: x + "/m2/*") flatDeps)} $out/m2'';
+
+  buildPhase = ''
+    mkdir -p $out/m2/${m2Path}
+    ${optionalString (length flatDeps > 0) find}
+    ${optionalString (length flatDeps > 0) copy}
+    echo "<settings><mirrors>\
+        <mirror><id>tmpm2</id><url>file://$out/m2</url><mirrorOf>*</mirrorOf></mirror></mirrors>\
+        <localRepository>$out/m2</localRepository></settings>" >> $out/m2/settings.xml
+    ${maven}/bin/mvn clean install -Dmaven.test.skip=true -gs $out/m2/settings.xml
+  '';
+}