# __init__.py

# dnf.automatic CLI

#

# Copyright (C) 2014-2016 Red Hat, Inc.

#

# This copyrighted material is made available to anyone wishing to use,

# modify, copy, or redistribute it subject to the terms and conditions of

# the GNU General Public License v.2, or (at your option) any later version.

# This program is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY expressed or implied, including the implied warranties 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, write to the

# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.  Any Red Hat trademarks that are incorporated in the

# source code or documentation are not subject to the GNU General Public

# License and may only be used or replicated with the express permission of

# Red Hat, Inc.

#

from __future__ import absolute_import

from __future__ import print_function

from __future__ import unicode_literals

import argparse

import logging

import random

import socket

import time

from dnf.i18n import _, ucd, P_

import dnf

import dnf.automatic.emitter

import dnf.cli

import dnf.cli.cli

import dnf.cli.output

import dnf.conf

import dnf.const

import dnf.exceptions

import dnf.util

import dnf.logging

import dnf.pycomp

import libdnf.conf

logger = logging.getLogger('dnf')

def build_emitters(conf):

    emitters = dnf.util.MultiCallList([])

    system_name = conf.emitters.system_name

    emit_via = conf.emitters.emit_via

    if emit_via:

        for name in emit_via:

            if name == 'email':

                emitter = dnf.automatic.emitter.EmailEmitter(system_name, conf.email)

                emitters.append(emitter)

            elif name == 'stdio':

                emitter = dnf.automatic.emitter.StdIoEmitter(system_name)

                emitters.append(emitter)

            elif name == 'motd':

                emitter = dnf.automatic.emitter.MotdEmitter(system_name)

                emitters.append(emitter)

            elif name == 'command':

                emitter = dnf.automatic.emitter.CommandEmitter(system_name, conf.command)

                emitters.append(emitter)

            elif name == 'command_email':

                emitter = dnf.automatic.emitter.CommandEmailEmitter(system_name, conf.command_email)

                emitters.append(emitter)

            else:

                raise dnf.exceptions.ConfigError("Unknown emitter option: %s" % name)

    return emitters

def parse_arguments(args):

    parser = argparse.ArgumentParser()

    parser.add_argument('conf_path', nargs='?', default=dnf.const.CONF_AUTOMATIC_FILENAME)

    parser.add_argument('--timer', action='store_true')

    parser.add_argument('--installupdates', dest='installupdates', action='store_true')

    parser.add_argument('--downloadupdates', dest='downloadupdates', action='store_true')

    parser.add_argument('--no-installupdates', dest='installupdates', action='store_false')

    parser.add_argument('--no-downloadupdates', dest='downloadupdates', action='store_false')

    parser.set_defaults(installupdates=None)

    parser.set_defaults(downloadupdates=None)

    return parser.parse_args(args), parser

class AutomaticConfig(object):

    def __init__(self, filename=None, downloadupdates=None,

                 installupdates=None):

        if not filename:

            filename = dnf.const.CONF_AUTOMATIC_FILENAME

        self.commands = CommandsConfig()

        self.email = EmailConfig()

        self.emitters = EmittersConfig()

        self.command = CommandConfig()

        self.command_email = CommandEmailConfig()

        self._parser = None

        self._load(filename)

        if downloadupdates:

            self.commands.download_updates = True

        elif downloadupdates is False:

            self.commands.download_updates = False

        if installupdates:

            self.commands.apply_updates = True

        elif installupdates is False:

            self.commands.apply_updates = False

        self.commands.imply()

        self.filename = filename

    def _load(self, filename):

        parser = libdnf.conf.ConfigParser()

        try:

            parser.read(filename)

        except RuntimeError as e:

            raise dnf.exceptions.ConfigError('Parsing file "%s" failed: %s' % (filename, e))

        except IOError as e:

            logger.warning(e)

        self.commands.populate(parser, 'commands', filename,

                               libdnf.conf.Option.Priority_AUTOMATICCONFIG)

        self.email.populate(parser, 'email', filename, libdnf.conf.Option.Priority_AUTOMATICCONFIG)

        self.emitters.populate(parser, 'emitters', filename,

                               libdnf.conf.Option.Priority_AUTOMATICCONFIG)

        self.command.populate(parser, 'command', filename,

                              libdnf.conf.Option.Priority_AUTOMATICCONFIG)

        self.command_email.populate(parser, 'command_email', filename,

                                    libdnf.conf.Option.Priority_AUTOMATICCONFIG)

        self._parser = parser

    def update_baseconf(self, baseconf):

        baseconf._populate(self._parser, 'base', self.filename, dnf.conf.PRIO_AUTOMATICCONFIG)

class Config(object):

    def __init__(self):

        self._options = {}

    def add_option(self, name, optionobj):

        self._options[name] = optionobj

        def prop_get(obj):

            return obj._options[name].getValue()

        def prop_set(obj, val):

            obj._options[name].set(libdnf.conf.Option.Priority_RUNTIME, val)

        setattr(type(self), name, property(prop_get, prop_set))

    def populate(self, parser, section, filename, priority):

        """Set option values from an INI file section."""

        if parser.hasSection(section):

            for name in parser.options(section):

                value = parser.getValue(section, name)

                if not value or value == 'None':

                    value = ''

                opt = self._options.get(name, None)

                if opt:

                    try:

                        opt.set(priority, value)

                    except RuntimeError as e:

                        logger.debug(_('Unknown configuration value: %s=%s in %s; %s'),

                                     ucd(name), ucd(value), ucd(filename), str(e))

                else:

                    logger.debug(

                        _('Unknown configuration option: %s = %s in %s'),

                        ucd(name), ucd(value), ucd(filename))

class CommandsConfig(Config):

    def __init__(self):

        super(CommandsConfig, self).__init__()

        self.add_option('apply_updates', libdnf.conf.OptionBool(False))

        self.add_option('base_config_file', libdnf.conf.OptionString('/etc/dnf/dnf.conf'))

        self.add_option('download_updates', libdnf.conf.OptionBool(False))

        self.add_option('upgrade_type', libdnf.conf.OptionEnumString('default',

                        libdnf.conf.VectorString(['default', 'security'])))

        self.add_option('random_sleep', libdnf.conf.OptionNumberInt32(300))

        self.add_option('network_online_timeout', libdnf.conf.OptionNumberInt32(60))

    def imply(self):

        if self.apply_updates:

            self.download_updates = True

class EmailConfig(Config):

    def __init__(self):

        super(EmailConfig, self).__init__()

        self.add_option('email_to',

                        libdnf.conf.OptionStringList(libdnf.conf.VectorString(["root"])))

        self.add_option('email_from', libdnf.conf.OptionString("root"))

        self.add_option('email_host', libdnf.conf.OptionString("localhost"))

        self.add_option('email_port', libdnf.conf.OptionNumberInt32(25))

class CommandConfig(Config):

    _default_command_format = "cat"

    _default_stdin_format = "{body}"

    def __init__(self):

        super(CommandConfig, self).__init__()

        self.add_option('command_format',

                        libdnf.conf.OptionString(self._default_command_format))

        self.add_option('stdin_format',

                        libdnf.conf.OptionString(self._default_stdin_format))

class CommandEmailConfig(CommandConfig):

    _default_command_format = "mail -Ssendwait -s {subject} -r {email_from} {email_to}"

    def __init__(self):

        super(CommandEmailConfig, self).__init__()

        self.add_option('email_to',

                        libdnf.conf.OptionStringList(libdnf.conf.VectorString(["root"])))

        self.add_option('email_from', libdnf.conf.OptionString("root"))

class EmittersConfig(Config):

    def __init__(self):

        super(EmittersConfig, self).__init__()

        self.add_option('emit_via', libdnf.conf.OptionStringList(

            libdnf.conf.VectorString(['email', 'stdio'])))

        self.add_option('output_width', libdnf.conf.OptionNumberInt32(80))

        self.add_option('system_name', libdnf.conf.OptionString(socket.gethostname()))

def gpgsigcheck(base, pkgs):

    ok = True

    for po in pkgs:

        result, errmsg = base.package_signature_check(po)

        if result != 0:

            ok = False

            logger.critical(errmsg)

    if not ok:

        raise dnf.exceptions.Error(_("GPG check FAILED"))

def wait_for_network(repos, timeout):

    '''

    Wait up to <timeout> seconds for network connection to be available.

    if <timeout> is 0 the network availability detection will be skipped.

    Returns True if any remote repository is accessible or remote repositories are not enabled.

    Returns False if none of remote repositories is accessible.

    '''

    if timeout <= 0:

        return True

    remote_schemes = {

        'http': 80,

        'https': 443,

        'ftp': 21,

    }

    def remote_address(url_list):

        for url in url_list:

            parsed_url = dnf.pycomp.urlparse.urlparse(url)

            if parsed_url.hostname and parsed_url.scheme in remote_schemes:

                yield (parsed_url.hostname,

                       parsed_url.port or remote_schemes[parsed_url.scheme])

    # collect possible remote repositories urls

    addresses = set()

    for repo in repos.iter_enabled():

        addresses.update(remote_address(repo.baseurl))

        addresses.update(remote_address([repo.mirrorlist]))

        addresses.update(remote_address([repo.metalink]))

    if not addresses:

        # there is no remote repository enabled so network connection should not be needed

        return True

    logger.debug(_('Waiting for internet connection...'))

    time_0 = time.time()

    while time.time() - time_0 < timeout:

        for host, port in addresses:

            try:

                s = socket.create_connection((host, port), 1)

                s.close()

                return True

            except socket.error:

                pass

        time.sleep(1)

    return False

def main(args):

    (opts, parser) = parse_arguments(args)

    try:

        conf = AutomaticConfig(opts.conf_path, opts.downloadupdates,

                               opts.installupdates)

        with dnf.Base() as base:

            cli = dnf.cli.Cli(base)

            cli._read_conf_file()

            # Although dnf-automatic does not use demands, the versionlock

            # plugin uses this demand do decide whether it's rules should

            # be applied.

            # https://bugzilla.redhat.com/show_bug.cgi?id=1746562

            cli.demands.resolving = True

            conf.update_baseconf(base.conf)

            base.init_plugins(cli=cli)

            logger.debug(_('Started dnf-automatic.'))

            if opts.timer:

                sleeper = random.randint(0, conf.commands.random_sleep)

                logger.debug(P_('Sleep for {} second', 'Sleep for {} seconds', sleeper).format(sleeper))

                time.sleep(sleeper)

            base.pre_configure_plugins()

            base.read_all_repos()

            if not wait_for_network(base.repos, conf.commands.network_online_timeout):

                logger.warning(_('System is off-line.'))

            base.configure_plugins()

            base.fill_sack()

            upgrade(base, conf.commands.upgrade_type)

            base.resolve()

            output = dnf.cli.output.Output(base, base.conf)

            trans = base.transaction

            if not trans:

                return 0

            lst = output.list_transaction(trans, total_width=80)

            emitters = build_emitters(conf)

            emitters.notify_available(lst)

            if not conf.commands.download_updates:

                emitters.commit()

                return 0

            base.download_packages(trans.install_set)

            emitters.notify_downloaded()

            if not conf.commands.apply_updates:

                emitters.commit()

                return 0

            gpgsigcheck(base, trans.install_set)

            base.do_transaction()

            emitters.notify_applied()

            emitters.commit()

    except dnf.exceptions.Error as exc:

        logger.error(_('Error: %s'), ucd(exc))

        return 1

    return 0

def upgrade(base, upgrade_type):

    if upgrade_type == 'security':

        base._update_security_filters.append(base.sack.query().upgrades().filterm(

            advisory_type='security'))

        base.upgrade_all()

    elif upgrade_type == 'default':

        base.upgrade_all()

    else:

        raise dnf.exceptions.Error(

            'Unsupported upgrade_type "{}", only "default" and "security" supported'.format(

                upgrade_type))