Bug fix

Author: john-b-yang

README.md

@@ -15,12 +15,13 @@
 
 CodeClash is a benchmark for evaluating AI systems on **goal-oriented software engineering**.
 
-Today's AI coding evals are *task*-oriented (e.g., HumanEval, SWE-bench).
+Today's AI coding evals are *task*-oriented (e.g.,
+<a href="https://github.com/openai/human-eval">HumanEval</a>, <a href="https://swebench.com">SWE-bench</a>).
 Models are given explicit instructions.
-We then verify implementations with unit tests.
+We then verify correctness with unit tests.
 
 But building software is fundamentally driven by goals ("improve user retention", "reduce costs", "increase revenue").
-Reaching our goals is a self-directed, iterative, and often competitive process.
+Reaching our goals via code is a self-directed, iterative, and often competitive process.
 To capture this dynamism of real software development, we introduce CodeClash!
 
 Check out our [arXiv paper](https://arxiv.org/abs/2511.00839) and [website](https://codeclash.ai/) for the full details!
@@ -35,6 +36,9 @@ $ pip install -e '.[dev]'
 $ python main.py configs/test/battlesnake.yaml
 ```
 
+> [!TIP]
+> CodeClash requires Docker to create execution environments. CodeClash was developed and tested on Ubuntu 22.04.4 LTS.
+
 Once this works, you should be set up to run a real tournament!
 To run *Claude Sonnet 4.5* against *o3* in a *BattleSnake* tournament with *5 rounds* and *1000 competition simulations* per round, run:
 ```bash

codeclash/arenas/arena.py

@@ -142,10 +142,7 @@ def build_image(self):
         arena_file = Path(inspect.getfile(self.__class__))
         folder_path = arena_file.parent
         result = subprocess.run(
-            (
-                "export $(cat .env | xargs);"
-                f"docker build --no-cache -t {self.image_name} -f {folder_path}/{self.name}.Dockerfile ."
-            ),
+            f"docker build --no-cache -t {self.image_name} -f {folder_path}/{self.name}.Dockerfile .",
             shell=True,
             capture_output=True,
             text=True,