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Filename : tui.py
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#!/usr/bin/env python3
# Copyright 2015 Canonical, Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import argparse
import sys
import os
import logging
from subiquitycore.log import setup_logger
from subiquitycore import __version__ as VERSION
from console_conf.core import ConsoleConf, RecoveryChooser


class ClickAction(argparse.Action):
    def __call__(self, parser, namespace, values, option_string=None):
        namespace.scripts.append("c(" + repr(values) + ")")


def parse_options(argv):
    parser = argparse.ArgumentParser(
        description=(
            'console-conf - Pre-Ownership Configuration for Ubuntu Core'),
        prog='console-conf')
    parser.add_argument('--dry-run', action='store_true',
                        dest='dry_run',
                        help='menu-only, do not call installer function')
    parser.add_argument('--serial', action='store_true',
                        dest='run_on_serial',
                        help='Run the installer over serial console.')
    parser.add_argument('--ascii', action='store_true',
                        dest='ascii',
                        help='Run the installer in ascii mode.')
    parser.add_argument('--machine-config', metavar='CONFIG',
                        dest='machine_config',
                        type=argparse.FileType(),
                        help="Don't Probe. Use probe data file")
    parser.add_argument('--screens', action='append', dest='screens',
                        default=[])
    parser.add_argument('--script', metavar="SCRIPT", action='append',
                        dest='scripts', default=[],
                        help=('Execute SCRIPT in a namespace containing view '
                              'helpers and "ui"'))
    parser.add_argument('--click', metavar="PAT", action=ClickAction,
                        help='Synthesize a click on a button matching PAT')
    parser.add_argument('--answers')
    parser.add_argument('--recovery-chooser-mode', action='store_true',
                        dest='chooser_systems',
                        help=('Run as a recovery chooser interacting with the '
                              'calling process over stdin/stdout streams'))
    parser.add_argument('--output-base', action='store', dest='output_base',
                        default='.subiquity',
                        help='in dryrun, control basedir of files')
    return parser.parse_args(argv)


LOGDIR = "/var/log/console-conf/"


def main():
    opts = parse_options(sys.argv[1:])
    global LOGDIR
    if opts.dry_run:
        LOGDIR = opts.output_base
    setup_logger(dir=LOGDIR)
    logger = logging.getLogger('console_conf')
    logger.info("Starting console-conf v{}".format(VERSION))
    logger.info("Arguments passed: {}".format(sys.argv))

    if opts.chooser_systems:
        # when running as a chooser, the stdin/stdout streams are set up by the
        # process that runs us, attempt to restore the tty in/out by looking at
        # stderr
        chooser_input, chooser_output = restore_std_streams_from(sys.stderr)
        interface = RecoveryChooser(opts, chooser_input, chooser_output)
    else:
        interface = ConsoleConf(opts)

    interface.run()


def restore_std_streams_from(from_file):
    """
    Attempt to restore the original sys.std{in,out} streams by inspecting the
    tty that stderr is hooked up to. Returns the chooser input/output streams.
    """
    tty = os.ttyname(from_file.fileno())
    # we have tty now
    chooser_input, chooser_output = sys.stdin, sys.stdout
    sys.stdin = open(tty, 'r')
    sys.stdout = open(tty, 'w')
    return chooser_input, chooser_output


if __name__ == '__main__':
    sys.exit(main())