plantuml-server: fixed unstable deps

after merging https://github.com/NixOS/nixpkgs/pull/163431 `plantuml-server-*-deps` derivation turned out unstable, this commit switches to fetching `plantuml.war` directly from releases

pkgs/tools/misc/plantuml-server/default.nix

@@ -1,69 +1,20 @@
-{ lib, stdenv, fetchFromGitHub, maven, jdk17_headless }:
+{ lib, stdenv, fetchurl }:
 
 let
   version = "1.2022.2";
-
-  src = fetchFromGitHub {
-    owner = "plantuml";
-    repo = "plantuml-server";
-    rev = "v${version}";
-    sha256 = "sha256-55IBhulFo42jscBFrHM39qA0GRgKBoYNye4q9QkmjsM=";
-  };
-
-  # perform fake build to make a fixed-output derivation out of the files downloaded from maven central
-  deps = stdenv.mkDerivation {
-    name = "plantuml-server-${version}-deps";
-    inherit src;
-    nativeBuildInputs = [ jdk17_headless maven ];
-    buildPhase = ''
-      runHook preBuild
-
-      while mvn package -Dmaven.repo.local=$out/.m2; [ $? = 1 ]; do
-        echo "timeout, restart maven to continue downloading"
-      done
-
-      runHook postBuild
-    '';
-    # keep only *.{pom,jar,sha1,nbm} and delete all ephemeral files with lastModified timestamps inside
-    installPhase = ''
-      find $out/.m2 -type f -regex '.+\(\.lastUpdated\|resolver-status\.properties\|_remote\.repositories\)' -delete
-    '';
-    outputHashAlgo = "sha256";
-    outputHashMode = "recursive";
-    outputHash = "sha256-AheCBX5jFzDHqTI2pCWBIiDESEKMClXlvWIcFvu0goA=";
-  };
 in
-
 stdenv.mkDerivation rec {
   pname = "plantuml-server";
   inherit version;
-  inherit src;
-
-  nativeBuildInputs = [ jdk17_headless maven ];
-
-  buildPhase = ''
-    runHook preBuild
-
-    # maven can output reproducible files after setting project.build.outputTimestamp property
-    # see https://maven.apache.org/guides/mini/guide-reproducible-builds.html#how-do-i-configure-my-maven-build
-    # 'maven.repo.local' must be writable so copy it out of nix store
-    cp -R $src repo
-    chmod +w -R repo
-    cd repo
-    mvn package --offline \
-      -Dproject.build.outputTimestamp=0 \
-      -Dmaven.repo.local=$(cp -dpR ${deps}/.m2 ./ && chmod +w -R .m2 && pwd)/.m2
-
-    runHook postBuild
-  '';
+  src = fetchurl {
+    url = "https://github.com/plantuml/plantuml-server/releases/download/v${version}/plantuml-v${version}.war";
+    sha256 = "sha256-h4ulXzZ5L+VPhk2CnZQNxfnEJzWT3B9TNvDEWt4o9Hk=";
+  };
 
+  dontUnpack = true;
   installPhase = ''
-    runHook preInstall
-
     mkdir -p "$out/webapps"
-    cp "target/plantuml.war" "$out/webapps/plantuml.war"
-
-    runHook postInstall
+    cp "$src" "$out/webapps/plantuml.war"
   '';
 
   meta = with lib; {