| #!/usr/bin/python |
| # Copyright 2013 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. |
| |
| # This script can either source a file and dump the enironment changes done by |
| # it, or just simply dump the current environment as JSON into a file. |
| |
| import json |
| import optparse |
| import os |
| import pipes |
| import subprocess |
| import sys |
| |
| |
| def main(): |
| parser = optparse.OptionParser() |
| parser.add_option('-f', '--output-json', |
| help='File to dump the environment as JSON into.') |
| parser.add_option( |
| '-d', '--dump-mode', action='store_true', |
| help='Dump the environment to sys.stdout and exit immediately.') |
| |
| parser.disable_interspersed_args() |
| options, args = parser.parse_args() |
| if options.dump_mode: |
| if args or options.output_json: |
| parser.error('Cannot specify args or --output-json with --dump-mode.') |
| json.dump(dict(os.environ), sys.stdout) |
| else: |
| if not options.output_json: |
| parser.error('Requires --output-json option.') |
| |
| envsetup_cmd = ' '.join(map(pipes.quote, args)) |
| full_cmd = [ |
| 'bash', '-c', |
| '. %s > /dev/null; %s -d' % (envsetup_cmd, os.path.abspath(__file__)) |
| ] |
| try: |
| output = subprocess.check_output(full_cmd) |
| except Exception as e: |
| sys.exit('Error running %s and dumping environment.' % envsetup_cmd) |
| |
| env_diff = {} |
| new_env = json.loads(output) |
| for k, val in new_env.items(): |
| if k == '_' or (k in os.environ and os.environ[k] == val): |
| continue |
| env_diff[k] = val |
| with open(options.output_json, 'w') as f: |
| json.dump(env_diff, f) |
| |
| |
| if __name__ == '__main__': |
| sys.exit(main()) |