linux installer: skip interactive prompt for username/password if already known

[dolmen]

In the linux installer, when the username and password are already provided via command line flags (--username, --password) the interactive prompt should either:

• be totally skipped (my preference)
• or dialog must be prepopulated with the known values

See function __get_username_password

CAT/devices/linux/Files/main.py

Lines 653 to 683 in 69fea3a

	def __get_username_password(self) -> None:
	"""
	read user password and set the password property
	do nothing if silent mode is set
	"""
	if self.silent:
	return
	if self.graphics in ('tkinter', 'zenity', 'yad'):
	self.__get_username_password_atomic()
	else:
	password = "a"
	password1 = "b"
	if self.username:
	user_prompt = self.username
	elif Config.hint_user_input:
	user_prompt = '@' + Config.user_realm
	else:
	user_prompt = ''
	while True:
	self.username = self.prompt_nonempty_string(
	1, Messages.username_prompt, user_prompt)
	if self.__validate_user_name():
	break
	while password != password1:
	password = self.prompt_nonempty_string(
	0, Messages.enter_password)
	password1 = self.prompt_nonempty_string(
	0, Messages.repeat_password)
	if password != password1:
	self.alert(Messages.passwords_differ)
	self.password = password

[twoln]

Actually the --silent option is required in this case as well, possibly this is a bit unintuitive.

The help text will be extended to explain that all options should be used together.

[dolmen]

What about making --silent implicit once both --username and --password are given?

[twoln]

I was using these flags to test the normal behavior of the installer but without the need to enter the password and username. But this could be done that silent is automatic but we have a separate flag or value of the flag to make things visible. I will do some testing.