[context] Split "env" values and prefixes.

bootstrap/bootstrap_vpython.py

 #!/usr/bin/env python
 # Copyright 2017 The LUCI Authors. All rights reserved.
 # Use of this source code is governed under the Apache License, Version 2.0
 # that can be found in the LICENSE file.
 
 import argparse
 import logging
 import os
 import subprocess
 import sys
@@ skipping 40 matching lines @@
   vpython_path = os.path.join(cipd_root, 'vpython' + EXE_EXTENSION)
   if not os.path.isfile(vpython_path):
     raise ValueError('`vpython` not found at [%s]' % (vpython_path,))
   return vpython_path
 
 
 def main(args):
   parser = argparse.ArgumentParser()
   parser.add_argument('--venv-spec', metavar='PATH',
       default=os.path.join(ROOT, 'bootstrap', 'venv.cfg'),
-      help='Path to vpython enviornment specification file to use (default '
+      help='Path to vpython environment specification file to use (default '
            'is %(default)s).')
   parser.add_argument('--vpython-path', metavar='PATH',
       help='Use "vpython" binary at PATH, instead of the bootstrap default.')
   parser.add_argument('-v', '--verbose', action='count', default=0,
       help='Increase verbosity. Can be specified multiple times.')
   parser.add_argument('--presubmit', action='store_true',
       help='Run PRESUBMIT check and exit, zero on success, non-zero on '
            'failure.')
   parser.add_argument('args', nargs='*',
       help='Flags and arguments to pass to the target Python script.')
@@ skipping 26 matching lines @@
     return subprocess.call(vpython_args)
 
   vpython_args += ['--'] + opts.args
   LOGGER.debug('Executing bootstrapped Python: %s', vpython_args)
   return subprocess.call(vpython_args)
 
 
 if __name__ == '__main__':
   logging.basicConfig()
   sys.exit(main(sys.argv[1:]))