Fix and simplify local runtime init (#7997)

openhands/runtime/impl/local/local_runtime.py

@@ -5,6 +5,7 @@ This runtime runs the action_execution_server directly on the local machine with
 import os
 import shutil
 import subprocess
+import sys
 import tempfile
 import threading
 from typing import Callable
@@ -204,38 +205,21 @@ class LocalRuntime(ActionExecutionClient):
         env = os.environ.copy()
         # Get the code repo path
         code_repo_path = os.path.dirname(os.path.dirname(openhands.__file__))
-        env['PYTHONPATH'] = f'{code_repo_path}:$PYTHONPATH'
+        env['PYTHONPATH'] = f'{code_repo_path}{os.pathsep}{env.get("PYTHONPATH", "")}'
         env['OPENHANDS_REPO_PATH'] = code_repo_path
         env['LOCAL_RUNTIME_MODE'] = '1'
-        # Get the poetry venv path using 'poetry env info --path'
-        try:
-            poetry_venvs_path = subprocess.check_output(  # noqa: ASYNC101
-                ['poetry', 'env', 'info', '--path'],
-                env=env,
-                cwd=code_repo_path,
-                text=True,
-                stderr=subprocess.PIPE,
-                shell=False,
-            ).strip()
-            # Verify it's a valid path (basic check)
-            if not os.path.isdir(poetry_venvs_path):
-                raise ValueError(f"'{poetry_venvs_path}' is not a valid directory.")
-        except (subprocess.CalledProcessError, FileNotFoundError, ValueError) as e:
-            # Attempt to fall back to environment variable if set
-            poetry_venvs_path = env.get('POETRY_VIRTUALENVS_PATH', '')
-            if not poetry_venvs_path or not os.path.isdir(poetry_venvs_path):
-                raise RuntimeError(
-                    'Cannot find poetry venv path using `poetry env info --path` or POETRY_VIRTUALENVS_PATH env var. '
-                    'Please check your poetry installation and ensure a virtual environment exists.'
-                ) from e
-            logger.warning(
-                f'Using fallback POETRY_VIRTUALENVS_PATH: {poetry_venvs_path}'
-            )
 
-        env['POETRY_VIRTUALENVS_PATH'] = poetry_venvs_path
-        logger.debug(f'POETRY_VIRTUALENVS_PATH: {poetry_venvs_path}')
+        # Derive environment paths using sys.executable
+        interpreter_path = sys.executable
+        python_bin_path = os.path.dirname(interpreter_path)
+        env_root_path = os.path.dirname(python_bin_path)
 
-        check_dependencies(code_repo_path, poetry_venvs_path)
+        # Prepend the interpreter's bin directory to PATH for subprocesses
+        env['PATH'] = f'{python_bin_path}{os.pathsep}{env.get("PATH", "")}'
+        logger.debug(f'Updated PATH for subprocesses: {env["PATH"]}')
+
+        # Check dependencies using the derived env_root_path
+        check_dependencies(code_repo_path, env_root_path)
         self.server_process = subprocess.Popen(  # noqa: ASYNC101
             cmd,
             stdout=subprocess.PIPE,