78 lines
2.2 KiB
Python
Executable File
78 lines
2.2 KiB
Python
Executable File
#!/usr/bin/python
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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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import os
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import sys
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def Main(argv):
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"""This is like 'env -i', but it uses a whitelist of env variables to allow
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through to the command being run. It attempts to strip off Xcode-added
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values from PATH.
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"""
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# Note: An attempt was made to do something like: env -i bash -lc '[command]'
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# but that fails to set the things set by login (USER, etc.), so instead
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# the only approach that seems to work is to have a whitelist.
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env_key_whitelist = (
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'HOME',
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'LOGNAME',
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# 'PATH' added below (but filtered).
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'PWD',
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'SHELL',
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'TEMP',
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'TMPDIR',
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'USER'
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)
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# Need something to run.
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# TODO(lliabraa): Make this output a usage string and exit (here and below).
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assert(len(argv) > 0)
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add_to_path = [];
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first_entry = argv[0];
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if first_entry.startswith('ADD_TO_PATH='):
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argv = argv[1:];
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add_to_path = first_entry.replace('ADD_TO_PATH=', '', 1).split(':')
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# Still need something to run.
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assert(len(argv) > 0)
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clean_env = {}
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# Pull over the whitelisted keys.
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for key in env_key_whitelist:
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val = os.environ.get(key, None)
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if not val is None:
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clean_env[key] = val
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# Collect the developer dir as set via Xcode, defaulting it.
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dev_prefix = os.environ.get('DEVELOPER_DIR', '/Developer/')
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if dev_prefix[-1:] != '/':
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dev_prefix += '/'
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# Now pull in PATH, but remove anything Xcode might have added.
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initial_path = os.environ.get('PATH', '')
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filtered_chunks = \
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[x for x in initial_path.split(':') if not x.startswith(dev_prefix)]
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if filtered_chunks:
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clean_env['PATH'] = ':'.join(add_to_path + filtered_chunks)
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# Add any KEY=VALUE args before the command to the cleaned environment.
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args = argv[:]
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while '=' in args[0]:
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(key, val) = args[0].split('=', 1)
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clean_env[key] = val
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args = args[1:]
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# Still need something to run.
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assert(len(args) > 0)
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# Off it goes...
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os.execvpe(args[0], args, clean_env)
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# Should never get here, so return a distinctive, non-zero status code.
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return 66
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if __name__ == '__main__':
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sys.exit(Main(sys.argv[1:]))
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