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# -*- coding: utf-8 -*-
#
# Authors:
# Pavel Březina <pbrezina@redhat.com>
#
# Copyright (C) 2018 Red Hat
#
# 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 3 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/>.
#
import errno
import os
import re
class ConfigSnippet:
TEST = False
AllKeysRE = re.compile(r'\${\??(?P<key>[\w-]*)}')
DummyKeysRE = re.compile(r'\${\?[\w-]*}')
def __init__(self, template, destination):
with open(template, "r") as f:
self.template = f.read()
self.destination = destination
def generate(self, values):
# First remove lines containing key that is not set
lines = self.template.split('\n')
remove = []
for idx, line in enumerate(lines):
for match in self.AllKeysRE.finditer(line):
key = match.group("key")
if key not in values or values[key] is None:
remove.append(idx)
break
for idx in sorted(remove, reverse=True):
del lines[idx]
# Build output string
output = '\n'.join(lines)
# Remove all dummy keys ${?key}
output = self.DummyKeysRE.sub("", output)
# Replace values
for key, value in values.items():
if value is None:
continue
if type(value) is bool:
value = "true" if value else "false"
output = output.replace("${%s}" % key, value)
return output
def write(self, values, to_stdout=False):
output = self.generate(values)
if self.TEST:
print("========== BEGIN Content of [%s] ==========" % self.destination)
print(output)
print("========== END Content of [%s] ==========\n" % self.destination)
return
dirname = os.path.dirname(self.destination)
if not os.path.exists(dirname):
try:
os.makedirs(dirname)
except OSError as exception:
if exception.errno == errno.EEXIST and os.path.isdir(dirname):
pass
else:
raise
with open(self.destination, "w") as f:
f.write(output)