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conf_checker.py
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conf_checker.py
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# (c) 2013, Petros Moisiadis <ernest0x@yahoo.gr>
#
# ganeti-backup 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.
#
# ganeti-backup 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 ganeti-backup. If not, see <http://www.gnu.org/licenses/>.
from os.path import exists as path_exists
from os import makedirs
import conf
class Error(Exception):
def __init__(self, msg):
self.msg = msg
def __str__(self):
return self.msg
class ConfChecker(object):
def __init__(self, conf_module, check_templates):
self.conf = conf_module
self.templates = check_templates
self.parent_template_names = self.get_parent_template_names()
def check_bool(self, check_template, attr):
if attr in check_template and check_template[attr]:
return True
else:
return False
def check_template(self, template_name, value=None):
template = self.templates[template_name]
if value == None:
try:
value = getattr(conf, template_name)
except AttributeError:
if template['required']:
raise Error('Required configuration option \'%s\''
' is missing' % template_name)
if type(value) != template['value_type']:
raise Error('Wrong value type for configuration option \'%s\'' % (
template_name,))
if 'values' in template and value not in template['values']:
raise Error('Wrong value for configuration option \'%s\'' % (
template_name,))
if self.check_bool(template, 'is_path') and \
self.check_bool(template, 'create_path'):
if not path_exists(value):
try:
makedirs(value, 0740)
except OSError as e:
raise Error('%s' % e)
if template['value_type'] == dict:
if 'keys' in template:
for index, key in enumerate(template['keys']):
value_template_names = template['templates'][index]
if type(value_template_names) not in [list, tuple]:
value_template_names = (value_template_names,)
value_templates_results = []
for value_template_name in value_template_names:
if key not in value and \
self.templates[value_template_name]['required']:
raise Error('Required field \'%s\' is missing' \
' from \'%s\'' % (key, template_name))
try:
self.check_template(value_template_name,
value[key])
value_templates_results.append('ok')
except Error as err:
value_templates_results.append(err)
if 'ok' not in value_templates_results:
errors = '\n'.join(
[str(err) for err in value_templates_results])
raise Error(errors)
else:
for key in value:
for value_template_name in template['templates']:
if key not in value and \
self.templates[value_template_name]['required']:
raise Error('Required field \'%s\' is missing' \
' from \'%s\'' % (key, template_name))
self.check_template(value_template_name, value[key])
if template['value_type'] == list:
found_items = []
found_field_values = {}
for item in value:
if item in found_items and \
self.check_bool(template, 'list_unique_items'):
raise Error('\'%s\' list must contain unique items' % (
template_name,))
found_items.append(item)
if 'list_item_unique_fields' in template:
for field in template['list_item_unique_fields']:
if field in found_field_values:
if item[field] in found_field_values[field]:
raise Error('Values of \'%s\' field in the'
' \'%s\' list must be unique' % (
field, template_name))
found_field_values[field].append(item[field])
else:
found_field_values[field] = [item[field]]
value_templates_results = []
for value_template_name in template['templates']:
try:
self.check_template(value_template_name, item)
value_templates_results.append('ok')
except Error as err:
value_templates_results.append(err)
if 'ok' not in value_templates_results:
errors = '\n'.join(
[str(err) for err in value_templates_results])
raise Error(errors)
def get_parent_template_names(self):
parent_template_names = []
for template_name in self.templates:
template = self.templates[template_name]
parent_template_names.append(template_name)
for template_name in self.templates:
template = self.templates[template_name]
if 'templates' in template:
for template_names in template['templates']:
if type(template_names) not in [list, tuple]:
template_names = (template_names,)
for child_template_name in template_names:
try:
parent_template_names.remove(child_template_name)
except ValueError:
pass
return parent_template_names
def run(self):
for template_name in self.parent_template_names:
self.check_template(template_name)
# vim: set filetype=python expandtab tabstop=4 shiftwidth=4 autoindent smartindent: