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# substitutions.py
# Config file substitutions.
#
# 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.
#
import logging
import os
import re
from libdnf.conf import ConfigParser
from dnf.i18n import _
from dnf.exceptions import ReadOnlyVariableError
ENVIRONMENT_VARS_RE = re.compile(r'^DNF_VAR_[A-Za-z0-9_]+$')
READ_ONLY_VARIABLES = frozenset()
logger = logging.getLogger('dnf')
class Substitutions(dict):
# :api
def __init__(self):
super(Substitutions, self).__init__()
self._update_from_env()
def _update_from_env(self):
numericvars = ['DNF%d' % num for num in range(0, 10)]
for key, val in os.environ.items():
if ENVIRONMENT_VARS_RE.match(key):
self[key[8:]] = val # remove "DNF_VAR_" prefix
elif key in numericvars:
self[key] = val
def __setitem__(self, key, value):
if Substitutions.is_read_only(key):
raise ReadOnlyVariableError(f"Variable \"{key}\" is read-only", variable_name=key)
setitem = super(Substitutions, self).__setitem__
setitem(key, value)
if key == "releasever" and value:
releasever_major, releasever_minor = ConfigParser.splitReleasever(value)
setitem("releasever_major", releasever_major)
setitem("releasever_minor", releasever_minor)
@staticmethod
def is_read_only(key):
# type: (str) -> bool
return key in READ_ONLY_VARIABLES
def update_from_etc(self, installroot, varsdir=("/etc/yum/vars/", "/etc/dnf/vars/")):
# :api
for vars_path in varsdir:
fsvars = []
try:
dir_fsvars = os.path.join(installroot, vars_path.lstrip('/'))
fsvars = os.listdir(dir_fsvars)
except OSError:
continue
for fsvar in fsvars:
filepath = os.path.join(dir_fsvars, fsvar)
val = None
if os.path.isfile(filepath):
try:
with open(filepath) as fp:
val = fp.readline()
if val and val[-1] == '\n':
val = val[:-1]
except (OSError, IOError, UnicodeDecodeError) as e:
logger.warning(_("Error when parsing a variable from file '{0}': {1}").format(filepath, e))
continue
if val is not None:
self[fsvar] = val