Remove mavenix + unused old nix infrastructure (#923)

Co-authored-by: Bruce Collie <[email protected]>

flake.nix

@@ -16,16 +16,15 @@
     pybind11-src.url =
       "github:pybind/pybind11/0ba639d6177659c5dc2955ac06ad7b5b0d22e05c";
     pybind11-src.flake = false;
-    mavenix.url = "github:nix-community/mavenix";
   };
 
-  outputs = { self, nixpkgs, utils, fmt-src, immer-src, rapidjson-src, pybind11-src, mavenix }:
+  outputs = { self, nixpkgs, utils, fmt-src, immer-src, rapidjson-src, pybind11-src }:
     let
       inherit (nixpkgs) lib;
 
-      # put devShell and any other required packages into local overlay
+      # put required packages into local overlay
       # if you have additional overlays, you may add them here
-      localOverlay = import ./nix/overlay.nix; # this should expose devShell
+      localOverlay = import ./nix/overlay.nix;
       depsOverlay = (final: prev: {
         inherit fmt-src immer-src rapidjson-src pybind11-src;
 
@@ -71,6 +70,10 @@
           ] ./matching);
       });
 
+      maven-overlay = (final: prev: {
+        maven = prev.callPackage ./nix/maven.nix { };
+      });
+
       llvm-backend-overlay =
         nixpkgs.lib.composeManyExtensions [ depsOverlay localOverlay ];
 
@@ -81,7 +84,7 @@
               inherit llvm-version;
               inherit llvm-backend-build-type;
             })
-            mavenix.overlay
+            maven-overlay
             llvm-backend-overlay
           ];
           inherit system;
@@ -105,7 +108,7 @@
             {
               name = "llvm-backend-${toString args.llvm-version}-${args.build-type}";
               value = {
-                inherit (pkgs) llvm-backend llvm-backend-matching llvm-kompile-testing integration-tests devShell;
+                inherit (pkgs) llvm-backend llvm-backend-matching llvm-kompile-testing integration-tests;
               };
             }
         ));
@@ -124,9 +127,9 @@
           llvm-backend-15-FastBuild.integration-tests
           llvm-backend-16-FastBuild.integration-tests
         ];
-        devShells.default = llvm-backend-16-FastBuild.devShell;
       }) // {
         # non-system suffixed items should go here
         overlays.default = llvm-backend-overlay;
+        overlays.maven = maven-overlay;
       };
 }

nix/build-maven-package.nix

@@ -0,0 +1,74 @@
+{ lib, stdenv, maven }:
+
+{ src, sourceRoot ? null, buildOffline ? false, patches ? [ ], pname, version
+, mvnHash ? "", mvnFetchExtraArgs ? { }, mvnDepsParameters ? ""
+, manualMvnArtifacts ? [ ], mvnParameters ? "", ... }@args:
+
+# originally extracted from dbeaver
+# created to allow using maven packages in the same style as rust
+
+let
+  fetchedMavenDeps = stdenv.mkDerivation ({
+    name = "${pname}-${version}-maven-deps";
+    inherit src sourceRoot patches;
+
+    nativeBuildInputs = [ maven ];
+
+    buildPhase = ''
+      runHook preBuild
+    '' + lib.optionalString buildOffline ''
+      mvn org.apache.maven.plugins:maven-dependency-plugin:3.6.1:go-offline -Dmaven.repo.local=$out/.m2 ${mvnDepsParameters}
+
+      for artifactId in ${builtins.toString manualMvnArtifacts}
+      do
+        echo "downloading manual $artifactId"
+        mvn dependency:get -Dartifact="$artifactId" -Dmaven.repo.local=$out/.m2
+      done
+    '' + lib.optionalString (!buildOffline) ''
+      mvn package -Dmaven.repo.local=$out/.m2 ${mvnParameters}
+    '' + ''
+      runHook postBuild
+    '';
+
+    # keep only *.{pom,jar,sha1,nbm} and delete all ephemeral files with lastModified timestamps inside
+    installPhase = ''
+      runHook preInstall
+
+      find $out -type f \( \
+        -name \*.lastUpdated \
+        -o -name resolver-status.properties \
+        -o -name _remote.repositories \
+        -o -name \*.snapshots.xml \
+        -o -name \*.snapshots.xml.sha1 \) \
+        -delete
+      
+      # delete any empty directories
+      find . -type d -empty -delete
+
+      runHook postInstall
+    '';
+
+    # don't do any fixup
+    dontFixup = true;
+    outputHashAlgo = if mvnHash != "" then null else "sha256";
+    outputHashMode = "recursive";
+    outputHash = mvnHash;
+  } // mvnFetchExtraArgs);
+in stdenv.mkDerivation (builtins.removeAttrs args [ "mvnFetchExtraArgs" ] // {
+  inherit fetchedMavenDeps;
+
+  nativeBuildInputs = args.nativeBuildInputs or [ ] ++ [ maven ];
+
+  buildPhase = ''
+    runHook preBuild
+
+    mvnDeps=$(cp -dpR ${fetchedMavenDeps}/.m2 ./ && chmod +w -R .m2 && pwd)
+    mvn package -o -nsu "-Dmaven.repo.local=$mvnDeps/.m2" ${mvnParameters}
+
+    runHook postBuild
+  '';
+
+  meta = args.meta or { } // {
+    platforms = args.meta.platforms or maven.meta.platforms;
+  };
+})