| # Copyright 2016 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import os |
| from os import path |
| import sys |
| |
| |
| # Based on http://stackoverflow.com/questions/377017/test-if-executable-exists-in-python. |
| def which(program): |
| |
| def is_executable(fpath): |
| return path.isfile(fpath) and os.access(fpath, os.X_OK) |
| |
| fpath, fname = path.split(program) |
| if fpath: |
| if is_executable(program): |
| return program |
| return None |
| env_paths = os.environ["PATH"].split(os.pathsep) |
| if sys.platform == "win32": |
| env_paths = get_windows_path(env_paths) |
| for part in env_paths: |
| part = part.strip('\"') |
| file = path.join(part, program) |
| if is_executable(file): |
| return file |
| if sys.platform == "win32" and not file.endswith(".exe"): |
| file_exe = file + ".exe" |
| if is_executable(file_exe): |
| return file_exe |
| return None |
| |
| |
| # Use to find 64-bit programs (e.g. Java) when using 32-bit python in Windows |
| def get_windows_path(env_paths): |
| new_env_paths = env_paths[:] |
| for env_path in env_paths: |
| env_path = env_path.lower() |
| if "system32" in env_path: |
| new_env_paths.append(env_path.replace("system32", "sysnative")) |
| return new_env_paths |
