# downgrade.py

# Downgrade CLI command.

#

# 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 unicode_literals

from dnf.cli import commands

from dnf.cli.option_parser import OptionParser

from dnf.i18n import _

class DowngradeCommand(commands.Command):

    """A class containing methods needed by the cli to execute the

    downgrade command.

    """

    aliases = ('downgrade', 'dg')

    summary = _("Downgrade a package")

    @staticmethod

    def set_argparser(parser):

        parser.add_argument('package', nargs='*', help=_('Package to downgrade'),

                            action=OptionParser.ParseSpecGroupFileCallback)

    def configure(self):

        demands = self.cli.demands

        demands.sack_activation = True

        demands.available_repos = True

        demands.resolving = True

        demands.root_user = True

        commands._checkGPGKey(self.base, self.cli)

        if not self.opts.filenames:

            commands._checkEnabledRepo(self.base)

    def run(self):

        file_pkgs = self.base.add_remote_rpms(self.opts.filenames, strict=False,

                                              progress=self.base.output.progress)

        return self.base.downgradePkgs(

            specs=self.opts.pkg_specs + ['@' + x for x in self.opts.grp_specs],

            file_pkgs=file_pkgs,

            strict=self.base.conf.strict)