From 53e3bbe78fbefbd09460577ae539647c758150aa Mon Sep 17 00:00:00 2001
From: mayor <john@ogle.fyi>
Date: Mon, 19 Jan 2026 10:39:58 -0800
Subject: [PATCH] fix(claude-code): preserve bun appended bundle during NixOS
 build
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Bun standalone executables store their JavaScript code by appending it
after the ELF sections, marked with "---- Bun! ----". The standard Nix
build process was corrupting this:

- autoPatchelfHook rewrites the entire ELF, losing appended data
- strip removes data after ELF sections
- patchelf shrink-rpath also rewrites the ELF

Fix by:
- Using dontStrip and dontPatchELF to skip automatic fixup
- Manually running patchelf --set-interpreter which modifies in-place
  without rewriting the entire file structure

This restores the binary from 99MB (bare bun runtime) to 220MB (full
claude-code application).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Executed-By: mayor
Role: mayor
---
 packages/claude-code/default.nix | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/packages/claude-code/default.nix b/packages/claude-code/default.nix
index 4d4a8fc..24437c8 100644
--- a/packages/claude-code/default.nix
+++ b/packages/claude-code/default.nix
@@ -1,7 +1,8 @@
 { lib
 , stdenv
 , fetchurl
-, autoPatchelfHook
+, patchelf
+, glibc
 }:
 
 let
@@ -38,8 +39,14 @@ in stdenv.mkDerivation {
 
   dontUnpack = true;
   dontBuild = true;
+  # Bun standalone binaries have JS code appended after the ELF sections
+  # stripping/patching would remove or corrupt this appended data
+  dontStrip = true;
+  dontPatchELF = true;
 
-  nativeBuildInputs = lib.optionals stdenv.isLinux [ autoPatchelfHook ];
+  # Don't use autoPatchelfHook - it rewrites the ELF and strips the appended
+  # bun bundle (the JS code is appended after the ELF sections)
+  nativeBuildInputs = lib.optionals stdenv.isLinux [ patchelf ];
 
   installPhase = ''
     runHook preInstall
@@ -49,6 +56,14 @@ in stdenv.mkDerivation {
     runHook postInstall
   '';
 
+  # Manually patch the interpreter for bun standalone binaries
+  # patchelf --set-interpreter modifies in-place without rewriting the entire ELF,
+  # preserving the appended JS bundle that bun needs at runtime
+  postFixup = lib.optionalString stdenv.isLinux ''
+    interpreter="${glibc}/lib/${if stdenv.hostPlatform.system == "aarch64-linux" then "ld-linux-aarch64.so.1" else "ld-linux-x86-64.so.2"}"
+    patchelf --set-interpreter "$interpreter" $out/bin/claude
+  '';
+
   meta = with lib; {
     description = "Terminal-based AI coding assistant from Anthropic";
     homepage = "https://www.anthropic.com/claude-code";