Helper script which can source a bash script and dump environment as JSON.

build/env_dump.py

Index: build/env_dump.py
diff --git a/build/env_dump.py b/build/env_dump.py
new file mode 100755
index 0000000000000000000000000000000000000000..6ee994eb07a9a7d269bf893b573d793af879327a
--- /dev/null
+++ b/build/env_dump.py
@@ -0,0 +1,45 @@
+#!/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.
+
+# Output environment setup by src/build/android/envsetup.sh to json file.
+
+import json
+import optparse
+import os
+import subprocess
+import sys
+
+
+def main():
+  parser = optparse.OptionParser()
+  parser.add_option('-f', '--output-json',
+                    help='Output json file to create with environment.')
+  parser.add_option(
+      '-d', '--dump-mode', action='store_true',
+      help='Dump the environment to stdout or file and exit immediately.')
+
+  options, args = parser.parse_args()

[iannucci, 2013/09/14 00:08:36]

maybe just do

if options.output_json is None:
  parser.error("--output-json is required")

and ditch the stdout path.

+  if options.dump_mode:
+    if options.output_json:
+      with open(options.output_json, 'w') as f:
+        json.dump(dict(os.environ), f)
+    else:
+      print json.dumps(dict(os.environ))
+    return

[iannucci, 2013/09/14 00:08:36]

let's do an else: instead of the early return

+
+  if not options.output_json:
+    parser.error('Requires --output-json or --dump-mode argument.')
+
+  envsetup_cmd = ' '.join(args)
+  full_cmd = [
+      'bash', '-c',
+      '. %s; ./%s -d -f %s' % (envsetup_cmd, __file__, options.output_json)]
+  ret = subprocess.call(full_cmd)
+  if ret:
+    sys.exit('Error running %s and dumping env', envsetup_cmd)
+
+
+if __name__ == '__main__':
+  sys.exit(main())