1 files changed, 88 insertions, 0 deletions
diff --git a/pkgs/by-name/ma/maven/build-maven.nix b/pkgs/by-name/ma/maven/build-maven.nix
new file mode 100644
index 0000000000000..7ac8afdde225a
--- /dev/null
+++ b/pkgs/by-name/ma/maven/build-maven.nix
@@ -0,0 +1,88 @@
+{ stdenv, maven, runCommand, writeText, fetchurl, lib, requireFile, linkFarm }:
+# Takes an info file generated by mvn2nix
+# (https://github.com/NixOS/mvn2nix-maven-plugin) and builds the maven
+# project with it.
+#
+# repo: A local maven repository with the project's dependencies.
+#
+# settings: A settings.xml to pass to maven to use the repo.
+#
+# build: A simple build derivation that uses mvn compile and package to build
+#        the project.
+#
+# @example
+#     project = pkgs.buildMaven ./project-info.json
+infoFile:
+let
+  info = lib.importJSON infoFile;
+
+  dependencies = lib.flatten (map (dep:
+    let
+      inherit (dep) sha1 groupId artifactId version metadata repository-id;
+      versionDir = dep.unresolved-version or version;
+      authenticated = dep.authenticated or false;
+      url = dep.url or "";
+
+      fetch = if (url != "") then
+        ((if authenticated then requireFile else fetchurl) {
+          inherit url sha1;
+        })
+      else
+        "";
+
+      fetchMetadata = (if authenticated then requireFile else fetchurl) {
+        inherit (metadata) url sha1;
+      };
+
+      layout = "${
+          builtins.replaceStrings [ "." ] [ "/" ] groupId
+        }/${artifactId}/${versionDir}";
+    in lib.optional (url != "") {
+      layout = "${layout}/${fetch.name}";
+      drv = fetch;
+    } ++ lib.optionals (dep ? metadata) ([{
+      layout = "${layout}/maven-metadata-${repository-id}.xml";
+      drv = fetchMetadata;
+    }] ++ lib.optional (fetch != "") {
+      layout = "${layout}/${
+          builtins.replaceStrings [ version ] [ dep.unresolved-version ]
+          fetch.name
+        }";
+      drv = fetch;
+    })) info.dependencies);
+
+  repo = linkFarm "maven-repository" (lib.forEach dependencies (dependency: {
+    name = dependency.layout;
+    path = dependency.drv;
+  }));
+
+  settings = writeText "settings.xml" ''
+    <settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
+      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
+                          http://maven.apache.org/xsd/settings-1.0.0.xsd">
+      <localRepository>${repo}</localRepository>
+    </settings>
+  '';
+
+  src = dirOf infoFile;
+in {
+  inherit repo settings info;
+
+  build = stdenv.mkDerivation {
+    name = "${info.project.artifactId}-${info.project.version}.jar";
+
+    src = builtins.filterSource (path: type:
+      (toString path) != (toString (src + "/target")) && (toString path)
+      != (toString (src + "/.git"))) src;
+
+    buildInputs = [ maven ];
+
+    buildPhase = "mvn --offline --settings ${settings} compile";
+
+    installPhase = ''
+      mvn --offline --settings ${settings} package
+      mv target/*.jar $out
+    '';
+  };
+}