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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 dnf
import dnf.exceptions
import os
class Substitutions(dict):
def __init__(self):
super(Substitutions, self).__init__()
self._update_from_env()
def _update_from_env(self):
for num in range(0, 10):
env = 'DNF%d' % num
val = os.environ.get(env, '')
if val:
self[env] = val
def update_from_etc(self, installroot):
fsvars = []
try:
dir_fsvars = os.path.join(installroot, "etc/dnf/vars/")
fsvars = os.listdir(dir_fsvars)
except OSError:
pass
for fsvar in fsvars:
filepath = os.path.join(dir_fsvars, fsvar)
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):
continue
self[fsvar] = val