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#!/usr/bin/env python3
# Copyright 2013 The Chromium Authors
# 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 shlex
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(shlex.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())
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