message: drake: fix DRAKE_PRETTY
diff: @@ -1749,15 +1749,15 @@ def command(cmd, cwd = None, stdout = None, env = None):
  def command_flatten(command, env = None):
  if env:
  - env = ('%s=%s' % (var, pipes.quote(str(env(value))))
  - for var in sorted(env.keys()))
  + env_ = ['%s=%s' % (var, pipes.quote(str(env[var])))
  + for var in sorted(env.keys())]
  if PRETTY:
  - env = ' \\\n '.join(env) + ' \\\n'
  + env_ = ' \\\n '.join(env_) + ' \\\n'
  else:
  - env = ' '.join(chain(env)) + ' '
  + env_ = ' '.join(env_) + ' '
  else:
  - env = ''
  - return env + ' '.join(pipes.quote(str(a)) for a in command)
  + env_ = ''
  + return env_ + ' '.join(pipes.quote(str(a)) for a in command)
  class Builder:
  