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Filename : generate_completion_cache.py
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# coding=utf-8
# generate_completion_cache.py - generate cache for dnf bash completion
# Copyright © 2013 Elad Alfassa <elad@fedoraproject.org>
# Copyright (C) 2014-2015 Igor Gnatenko <i.gnatenko.brain@gmail.com>
# Copyright (C) 2015  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.

from __future__ import absolute_import
from __future__ import unicode_literals
from dnf.i18n import ucd
from dnfpluginscore import logger

import dnf
import os.path
import sqlite3


class BashCompletionCache(dnf.Plugin):
    name = 'generate_completion_cache'

    def __init__(self, base, cli):
        super(BashCompletionCache, self).__init__(base, cli)
        self.base = base
        self.cache_file = "/var/cache/dnf/packages.db"

    @staticmethod
    def _out(msg):
        logger.debug('Completion plugin: %s', msg)

    def sack(self):
        ''' Generate cache of available packages '''
        # We generate this cache only if the repos were just freshed or if the
        # cache file doesn't exist

        fresh = False
        for repo in self.base.repos.iter_enabled():
            if repo.metadata is not None and repo.metadata.fresh:
                # One fresh repo is enough to cause a regen of the cache
                fresh = True
                break

        if not os.path.exists(self.cache_file) or fresh:
            try:
                with sqlite3.connect(self.cache_file) as conn:
                    self._out('Generating completion cache...')
                    cur = conn.cursor()
                    cur.execute(
                        "create table if not exists available (pkg TEXT)")
                    cur.execute(
                        "create unique index if not exists "
                        "pkg_available ON available(pkg)")
                    cur.execute("delete from available")
                    avail_pkgs = self.base.sack.query().available()
                    avail_pkgs_insert = [[str(x)] for x in avail_pkgs if x.arch != "src"]
                    cur.executemany("insert or ignore into available values (?)",
                                    avail_pkgs_insert)
                    conn.commit()
            except sqlite3.OperationalError as e:
                self._out("Can't write completion cache: %s" % ucd(e))

    def transaction(self):
        ''' Generate cache of installed packages '''
        if not self.transaction:
            return

        try:
            with sqlite3.connect(self.cache_file) as conn:
                self._out('Generating completion cache...')
                cur = conn.cursor()
                cur.execute("create table if not exists installed (pkg TEXT)")
                cur.execute(
                    "create unique index if not exists "
                    "pkg_installed ON installed(pkg)")
                cur.execute("delete from installed")
                inst_pkgs = dnf.sack._rpmdb_sack(self.base).query().installed()
                inst_pkgs_insert = [[str(x)] for x in inst_pkgs if x.arch != "src"]
                cur.executemany("insert or ignore into installed values (?)",
                                inst_pkgs_insert)
                conn.commit()
        except sqlite3.OperationalError as e:
            self._out("Can't write completion cache: %s" % ucd(e))