Function win_get_environment_variable

emsdk.py:331–364

(key, system=True, user=True, fallback=True)

def win_get_environment_variable(key, system=True, user=True, fallback=True):
  if (not system and not user and fallback):
    # if no --system or --permanent flag is provided use shell's value
    return os.environ[key]
  try:
    folder = None
    try:
      if system:
        # Read globally from ALL USERS section.
        folder = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, 'SYSTEM\\CurrentControlSet\\Control\\Session Manager\\Environment')
      else:
        # Register locally from CURRENT USER section.
        folder = winreg.OpenKey(winreg.HKEY_CURRENT_USER, 'Environment')
      value = str(winreg.QueryValueEx(folder, key)[0])
    except Exception:
      # If reading registry fails for some reason - read via os.environ. This has the drawback
      # that expansion items such as %PROGRAMFILES% will have been expanded, so
      # need to be precise not to set these back to system registry, or
      # expansion items would be lost.
      if fallback:
        return os.environ[key]
      return None
    finally:
      if folder is not None:
        folder.Close()

  except Exception as e:
    # this catch is if both the registry key threw an exception and the key is not in os.environ
    if e.args[0] != 2:
      # 'The system cannot find the file specified.'
      errlog(f'Failed to read environment variable {key}:')
      errlog(str(e))
    return None
  return value


def win_set_environment_variable(key, value, system, user):