| # |
| # |
| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| # |
| # |
| # |
| # executable.py -- Utilities for dealing with external executables |
| # |
| |
| import os |
| import subprocess |
| |
| def exists(file): |
| """Is this an executable file?""" |
| return os.path.isfile(file) and os.access(file, os.X_OK) |
| |
| def find(file, dirs=None): |
| """Search for an executable in a given list of directories. |
| If no directories are given, search according to the PATH |
| environment variable.""" |
| if not dirs: |
| dirs = os.environ["PATH"].split(os.pathsep) |
| for path in dirs: |
| if is_executable(os.path.join(path, file)): |
| return os.path.join(path, file) |
| elif is_executable(os.path.join(path, "%s.exe" % file)): |
| return os.path.join(path, "%s.exe" % file) |
| return None |
| |
| def output(cmd, strip=None): |
| """Run a command and collect all output""" |
| # Check that cmd is in PATH (otherwise we'd get a generic OSError later) |
| import distutils.spawn |
| if isinstance(cmd, str): |
| cmdname = cmd |
| elif isinstance(cmd, list): |
| cmdname = cmd[0] |
| if distutils.spawn.find_executable(cmdname) is None: |
| return None |
| |
| # Run it |
| (output, empty_stderr) = subprocess.Popen(cmd, stdout=subprocess.PIPE, \ |
| stderr=subprocess.STDOUT).communicate() |
| if strip: |
| return output.strip() |
| else: |
| return output |
| |
| def run(cmd): |
| """Run a command""" |
| exit_code = os.system(cmd) |
| assert(not exit_code) |