Source code for pylorax.api.dnfbase

#
# Copyright (C) 2017-2018 Red Hat, Inc.
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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/>.
#
# pylint: disable=bad-preconf-access

import logging
log = logging.getLogger("lorax-composer")

import dnf
import dnf.logging
from glob import glob
import os
import shutil

from pylorax import DEFAULT_PLATFORM_ID
from pylorax.sysutils import flatconfig

[docs]def get_base_object(conf): """Get the DNF object with settings from the config file :param conf: configuration object :type conf: ComposerParser :returns: A DNF Base object :rtype: dnf.Base """ cachedir = os.path.abspath(conf.get("composer", "cache_dir")) dnfconf = os.path.abspath(conf.get("composer", "dnf_conf")) dnfroot = os.path.abspath(conf.get("composer", "dnf_root")) repodir = os.path.abspath(conf.get("composer", "repo_dir")) # Setup the config for the DNF Base object dbo = dnf.Base() dbc = dbo.conf # TODO - Handle this # dbc.logdir = logdir dbc.installroot = dnfroot if not os.path.isdir(dnfroot): os.makedirs(dnfroot) if not os.path.isdir(repodir): os.makedirs(repodir) dbc.cachedir = cachedir dbc.reposdir = [repodir] dbc.install_weak_deps = False dbc.prepend_installroot('persistdir') dbc.tsflags.append('nodocs') if conf.get_default("dnf", "proxy", None): dbc.proxy = conf.get("dnf", "proxy") if conf.has_option("dnf", "sslverify") and not conf.getboolean("dnf", "sslverify"): dbc.sslverify = False _releasever = conf.get_default("composer", "releasever", None) if not _releasever: # Use the releasever of the host system _releasever = dnf.rpm.detect_releasever("/") log.info("releasever = %s", _releasever) dbc.releasever = _releasever # DNF 3.2 needs to have module_platform_id set, otherwise depsolve won't work correctly if not os.path.exists("/etc/os-release"): log.warning("/etc/os-release is missing, cannot determine platform id, falling back to %s", DEFAULT_PLATFORM_ID) platform_id = DEFAULT_PLATFORM_ID else: os_release = flatconfig("/etc/os-release") platform_id = os_release.get("PLATFORM_ID", DEFAULT_PLATFORM_ID) log.info("Using %s for module_platform_id", platform_id) dbc.module_platform_id = platform_id # write the dnf configuration file with open(dnfconf, "w") as f: f.write(dbc.dump()) # dnf needs the repos all in one directory, composer uses repodir for this # if system repos are supposed to be used, copy them into repodir, overwriting any previous copies if not conf.has_option("repos", "use_system_repos") or conf.getboolean("repos", "use_system_repos"): for repo_file in glob("/etc/yum.repos.d/*.repo"): shutil.copy2(repo_file, repodir) dbo.read_all_repos() # Update the metadata from the enabled repos to speed up later operations log.info("Updating repository metadata") try: dbo.fill_sack(load_system_repo=False) dbo.read_comps() except dnf.exceptions.Error as e: log.error("Failed to update metadata: %s", str(e)) raise RuntimeError("Fetching metadata failed: %s" % str(e)) return dbo