Prefer native Homebrew tool paths on Apple Silicon

utils/dependencies.py

@@ -1,10 +1,11 @@
 from __future__ import annotations
 
-import logging
-import os
-import shutil
-import subprocess
-from typing import Any
+import logging
+import os
+import platform
+import shutil
+import subprocess
+from typing import Any
 
 logger = logging.getLogger('intercept.dependencies')
 
@@ -17,12 +18,26 @@ def check_tool(name: str) -> bool:
     return get_tool_path(name) is not None
 
 
-def get_tool_path(name: str) -> str | None:
-    """Get the full path to a tool, checking standard PATH and extra locations."""
-    # First check standard PATH
-    path = shutil.which(name)
-    if path:
-        return path
+def get_tool_path(name: str) -> str | None:
+    """Get the full path to a tool, checking standard PATH and extra locations."""
+    # Prefer native Homebrew binaries on Apple Silicon to avoid mixing Rosetta
+    # /usr/local tools with arm64 Python/runtime.
+    if platform.system() == 'Darwin':
+        machine = platform.machine().lower()
+        preferred_paths: list[str] = []
+        if machine in {'arm64', 'aarch64'}:
+            preferred_paths.append('/opt/homebrew/bin')
+        preferred_paths.append('/usr/local/bin')
+
+        for base in preferred_paths:
+            full_path = os.path.join(base, name)
+            if os.path.isfile(full_path) and os.access(full_path, os.X_OK):
+                return full_path
+
+    # First check standard PATH
+    path = shutil.which(name)
+    if path:
+        return path
 
     # Check additional paths (e.g., /usr/sbin for aircrack-ng on Debian)
     for extra_path in EXTRA_TOOL_PATHS: