# sack.py

# The dnf.Sack class, derived from hawkey.Sack

#

# Copyright (C) 2012-2016 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

import dnf.util

import dnf.package

import dnf.query

import logging

import hawkey

import os

from dnf.pycomp import basestring

from dnf.i18n import _

logger = logging.getLogger("dnf")

class Sack(hawkey.Sack):

    # :api

    def __init__(self, *args, **kwargs):

        super(Sack, self).__init__(*args, **kwargs)

    def _configure(self, installonly=None, installonly_limit=0, allow_vendor_change=None):

        if installonly:

            self.installonly = installonly

        self.installonly_limit = installonly_limit

        if allow_vendor_change is not None:

            self.allow_vendor_change = allow_vendor_change

            if allow_vendor_change is False:

                logger.warning(_("allow_vendor_change is disabled. This option is currently not supported for downgrade and distro-sync commands"))

    def query(self, flags=0):

        # :api

        """Factory function returning a DNF Query."""

        return dnf.query.Query(self, flags)

def _build_sack(base):

    cachedir = base.conf.cachedir

    # create the dir ourselves so we have the permissions under control:

    dnf.util.ensure_dir(cachedir)

    return Sack(pkgcls=dnf.package.Package, pkginitval=base,

                arch=base.conf.substitutions["arch"],

                cachedir=cachedir, rootdir=base.conf.installroot,

                logfile=os.path.join(base.conf.logdir, dnf.const.LOG_HAWKEY),

                logdebug=base.conf.logfilelevel > 9)

def _rpmdb_sack(base):

    # used by subscription-manager (src/dnf-plugins/product-id.py)

    sack = _build_sack(base)

    try:

        # It can fail if rpmDB is not present

        sack.load_system_repo(build_cache=False)

    except IOError:

        pass

    return sack

def rpmdb_sack(base):

    # :api

    """

    Returns a new instance of sack containing only installed packages (@System repo)

    Useful to get list of the installed RPMs after transaction.

    """

    return _rpmdb_sack(base)