hmcl: add patch jar to fix terracotta

From 541d055bf55703aa9e2c5a5e04a397f1d25efe28 Mon Sep 17 00:00:00 2001

From: Moraxyc <i@qaq.li>

Date: Wed, 29 Oct 2025 00:09:56 +0800

Subject: [PATCH 2/3] nix: use terracotta from nix

---

 .../org/jackhuang/hmcl/terracotta/TerracottaNative.java   | 8 +++-----

 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/terracotta/TerracottaNative.java b/HMCL/src/main/java/org/jackhuang/hmcl/terracotta/TerracottaNative.java

index 079537978..68954b09e 100644

--- a/HMCL/src/main/java/org/jackhuang/hmcl/terracotta/TerracottaNative.java

+++ b/HMCL/src/main/java/org/jackhuang/hmcl/terracotta/TerracottaNative.java

@@ -47,7 +47,7 @@ public final class TerracottaNative {

     public TerracottaNative(List<URI> links, Path path, FileDownloadTask.IntegrityCheck checking) {

         this.links = links;

-        this.path = path;

+        this.path = Path.of("@TERRACOTTA_BIN@");

         this.checking = checking;

     }

@@ -130,9 +130,7 @@ public final class TerracottaNative {

     public ITerracottaProvider.Status status() throws IOException {

         if (Files.exists(path)) {

-            if (DigestUtils.digestToString(checking.getAlgorithm(), path).equalsIgnoreCase(checking.getChecksum())) {

-                return ITerracottaProvider.Status.READY;

-            }

+            return ITerracottaProvider.Status.READY;

         }

         try {

@@ -144,4 +142,4 @@ public final class TerracottaNative {

         }

         return ITerracottaProvider.Status.NOT_EXIST;

     }

-}

+}

\ No newline at end of file

-- 

2.51.0

From bcf95a23380424f2ca82649d93e9e0bdf8274b74 Mon Sep 17 00:00:00 2001

From: Moraxyc <i@qaq.li>

Date: Fri, 31 Oct 2025 14:23:54 +0800

Subject: [PATCH 3/3] nix: skip terracotta existence check on darwin

---

 .../org/jackhuang/hmcl/terracotta/provider/MacOSProvider.java | 4 ----

 1 file changed, 4 deletions(-)

diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/terracotta/provider/MacOSProvider.java b/HMCL/src/main/java/org/jackhuang/hmcl/terracotta/provider/MacOSProvider.java

index 00626f8b6..59125962d 100644

--- a/HMCL/src/main/java/org/jackhuang/hmcl/terracotta/provider/MacOSProvider.java

+++ b/HMCL/src/main/java/org/jackhuang/hmcl/terracotta/provider/MacOSProvider.java

@@ -45,10 +45,6 @@ public final class MacOSProvider implements ITerracottaProvider {

     public Status status() throws IOException {

         assert binary != null;

-        if (!Files.exists(Path.of("/Applications/terracotta.app"))) {

-            return Status.NOT_EXIST;

-        }

-

         return binary.status();

     }

-- 

2.51.0

  lib,

  stdenv,

  fetchurl,

  replaceVars,

  terracotta,

  makeDesktopItem,

  wrapGAppsHook3,

  copyDesktopItems,

  imagemagick,

  jdk,

  jdk17,

  jdk21,

  hmclJdk ? jdk,

  hmclJdk ? jdk.override {

    # Required by jar file

    enableJavaFX = true;

  },

  buildPackages,

  hmclJdkBuild ? buildPackages.jdk.override {

    enableJavaFX = true;

  },

  minecraftJdks ? [

    jdk

    hmclJdk

    jdk17

    jdk21

  ],

  xorg,

  glib,

    hash = "sha256-1OVq4ujA2ZHboB7zEk7004kYgl9YcoM4qLq154MZMGo=";

  };

  # - HMCL prompts users to download prebuilt Terracotta binary for

  #   multi-user functionality, which is messy and doesn’t work on NixOS.

  # - Building from source isn’t feasible because HMCL’s code relies on

  #   Microsoft OAuth, CurseForge, and other API keys that upstream doesn’t

  #   allow in custom builds, causing features to break.

  # - Our workaround is to compile only the Java files that handle

  #   Terracotta downloads, package them into a patch jar that overrides

  #   the original classes, and have it load the original jar. This preserves

  #   the original jar’s integrity check and avoids modifying the upstream jar.

  terracottaNativeJava = fetchurl {

    name = "hmcl-terracotta-native-java-${finalAttrs.version}";

    url = "https://raw.githubusercontent.com/HMCL-dev/HMCL/v${finalAttrs.version}/${finalAttrs.terracottaNativeJavaPath}";

    hash = "sha256-sg8gBOMNdITmHeYByYriYp05ja1vtWPF/wuqdGmkgiA=";

  };

  macOSProviderJava = fetchurl {

    name = "hmcl-macos-provider-java-${finalAttrs.version}";

    url = "https://raw.githubusercontent.com/HMCL-dev/HMCL/v${finalAttrs.version}/${finalAttrs.macOSProviderJavaPath}";

    hash = "sha256-V8FNPPkq6/P3/HKcqKkAy6Ya1kUI3oEMfjEc8XdExgo=";

  };

  terracottaNativeJavaPath = "HMCL/src/main/java/org/jackhuang/hmcl/terracotta/TerracottaNative.java";

  macOSProviderJavaPath = "HMCL/src/main/java/org/jackhuang/hmcl/terracotta/provider/MacOSProvider.java";

  dontUnpack = true;

  prePatch = ''

    install -Dm644 $terracottaNativeJava $terracottaNativeJavaPath

    install -Dm644 $macOSProviderJava $macOSProviderJavaPath

  '';

  patches = [

    (replaceVars ./0002-nix-use-terracotta-from-nix.patch {

      TERRACOTTA_BIN = lib.getExe terracotta;

    })

    ./0003-nix-skip-terracotta-existence-check-on-darwin.patch

  ];

  buildPhase = ''

    runHook preBuild

    # Build only classes we modified

    javac -cp $src -d out $terracottaNativeJavaPath $macOSProviderJavaPath

    # Extract MANIFEST.MF from original jar

    # We need Main-Class, Add-Opens, etc

    jar xf $src META-INF/MANIFEST.MF

    # Remove last empty line; otherwise file is invalid

    sed -i '/^[[:space:]]*$/d' META-INF/MANIFEST.MF

    # Let our patch jar be the entrace and load hmcl.jar

    echo "Class-Path: $out/lib/hmcl/hmcl.jar" >> META-INF/MANIFEST.MF

    # Package our patch jar

    # Reserve link to terracotta by not applying zip; nix cannot detect path from zipped jar

    jar cvf0m patch.jar META-INF/MANIFEST.MF -C out .

    runHook postBuild

  '';

  dontWrapGApps = true;

  desktopItems = [

    wrapGAppsHook3

    copyDesktopItems

    imagemagick

    hmclJdkBuild

  ];

  installPhase = ''

    mkdir -p $out/{bin,lib/hmcl}

    cp $src $out/lib/hmcl/hmcl.jar

    cp patch.jar $out/lib/hmcl/hmcl-terracotta-patch.jar

    for n in 16 32 48 64 96 128 256

    do

          alsa-lib

        ]

      );

      hmclJdk' = hmclJdk.override {

        enableJavaFX = true; # Necessary for hardware acceleration.

      };

    in

    ''

      runHook preFixup

      makeBinaryWrapper ${hmclJdk'}/bin/java $out/bin/hmcl \

        --add-flags "-jar $out/lib/hmcl/hmcl.jar" \

      makeBinaryWrapper ${hmclJdk}/bin/java $out/bin/hmcl \

        --add-flags "-jar $out/lib/hmcl/hmcl-terracotta-patch.jar" \

        --set LD_LIBRARY_PATH ${libpath} \

        --prefix PATH : "${lib.makeBinPath minecraftJdks}"\

        ''${gappsWrapperArgs[@]}

    description = "Minecraft Launcher which is multi-functional, cross-platform and popular";

    changelog = "https://docs.hmcl.net/changelog/stable.html";

    mainProgram = "hmcl";

    sourceProvenance = with lib.sourceTypes; [ binaryBytecode ];

    sourceProvenance = with lib.sourceTypes; [

      fromSource # Our patch jar is built from source

      binaryBytecode

    ];

    license = lib.licenses.gpl3Only;

    longDescription = ''

      Hello Minecraft! Launcher (HMCL) is a free, open-source, and cross-platform Minecraft launcher.

      It provides comprehensive support for managing multiple game versions and mod loaders,

      including Forge, NeoForge, Fabric, Quilt, LiteLoader, and OptiFine.

      Note: HMCL manages the Terracotta binary internally. On NixOS, Terracotta-related features

      require `programs.nix-ld` to be enabled, as the runtime-downloaded binary is not patched.

    '';

    maintainers = with lib.maintainers; [

      daru-san

    nix-update hmcl --version="$version"

    update-source-version hmcl --source-key=icon --ignore-same-version

    update-source-version hmcl --source-key=terracottaNativeJava --ignore-same-version

    update-source-version hmcl --source-key=macOSProviderJava --ignore-same-version

  '';

}