430 lines
14 KiB
Python
430 lines
14 KiB
Python
#!/usr/bin/env python
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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import glob
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import grp
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import json
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import logging
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import os
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import pwd
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import shutil
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import sys
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# TODO(rhallisey): add docstring.
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logging.basicConfig()
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LOG = logging.getLogger(__name__)
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LOG.setLevel(logging.INFO)
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class ExitingException(Exception):
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def __init__(self, message, exit_code=1):
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super(ExitingException, self).__init__(message)
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self.exit_code = exit_code
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class ImmutableConfig(ExitingException):
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pass
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class InvalidConfig(ExitingException):
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pass
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class MissingRequiredSource(ExitingException):
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pass
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class UserNotFound(ExitingException):
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pass
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class ConfigFileBadState(ExitingException):
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pass
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class ConfigFile(object):
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def __init__(self, source, dest, owner=None, perm=None, optional=False,
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preserve_properties=False, merge=False):
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self.source = source
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self.dest = dest
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self.owner = owner
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self.perm = perm
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self.optional = optional
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self.merge = merge
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self.preserve_properties = preserve_properties
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def __str__(self):
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return '<ConfigFile source:"{}" dest:"{}">'.format(self.source,
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self.dest)
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def _copy_file(self, source, dest):
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self._delete_path(dest)
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# dest endswith / means copy the <source> to <dest> folder
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LOG.info('Copying %s to %s', source, dest)
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if self.merge and self.preserve_properties and os.path.islink(source):
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link_target = os.readlink(source)
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os.symlink(link_target, dest)
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else:
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shutil.copy(source, dest)
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self._set_properties(source, dest)
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def _merge_directories(self, source, dest):
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if os.path.isdir(source):
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if os.path.lexists(dest) and not os.path.isdir(dest):
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self._delete_path(dest)
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if not os.path.isdir(dest):
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LOG.info('Creating directory %s', dest)
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os.makedirs(dest)
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self._set_properties(source, dest)
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dir_content = os.listdir(source)
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for to_copy in dir_content:
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self._merge_directories(os.path.join(source, to_copy),
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os.path.join(dest, to_copy))
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else:
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self._copy_file(source, dest)
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def _delete_path(self, path):
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if not os.path.lexists(path):
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return
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LOG.info('Deleting %s', path)
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if os.path.isdir(path):
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shutil.rmtree(path)
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else:
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os.remove(path)
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def _create_parent_dirs(self, path):
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parent_path = os.path.dirname(path)
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if not os.path.exists(parent_path):
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os.makedirs(parent_path)
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def _set_properties(self, source, dest):
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if self.preserve_properties:
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self._set_properties_from_file(source, dest)
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else:
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self._set_properties_from_conf(dest)
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def _set_properties_from_file(self, source, dest):
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shutil.copystat(source, dest)
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stat = os.stat(source)
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os.chown(dest, stat.st_uid, stat.st_gid)
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def _set_properties_from_conf(self, path):
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config = {'permissions':
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[{'owner': self.owner, 'path': path, 'perm': self.perm}]}
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handle_permissions(config)
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def copy(self):
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sources = glob.glob(self.source)
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if not self.optional and not sources:
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raise MissingRequiredSource('%s file is not found' % self.source)
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# skip when there is no sources and optional
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elif self.optional and not sources:
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return
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for source in sources:
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dest = self.dest
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# dest endswith / means copy the <source> into <dest> folder,
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# otherwise means copy the source to dest
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if dest.endswith(os.sep):
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dest = os.path.join(dest, os.path.basename(source))
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if not self.merge:
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self._delete_path(dest)
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self._create_parent_dirs(dest)
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self._merge_directories(source, dest)
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def _cmp_file(self, source, dest):
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# check exsit
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if (os.path.exists(source) and
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not self.optional and
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not os.path.exists(dest)):
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return False
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# check content
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with open(source) as f1, open(dest) as f2:
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if f1.read() != f2.read():
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LOG.error('The content of source file(%s) and'
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' dest file(%s) are not equal.', source, dest)
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return False
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# check perm
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file_stat = os.stat(dest)
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actual_perm = oct(file_stat.st_mode)[-4:]
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if self.perm != actual_perm:
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LOG.error('Dest file does not have expected perm: %s, actual: %s',
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self.perm, actual_perm)
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return False
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# check owner
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desired_user, desired_group = user_group(self.owner)
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actual_user = pwd.getpwuid(file_stat.st_uid)
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if actual_user.pw_name != desired_user:
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LOG.error('Dest file does not have expected user: %s,'
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' actual: %s ', desired_user, actual_user.pw_name)
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return False
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actual_group = grp.getgrgid(file_stat.st_gid)
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if actual_group.gr_name != desired_group:
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LOG.error('Dest file does not have expected group: %s,'
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' actual: %s ', desired_group, actual_group.gr_name)
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return False
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return True
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def _cmp_dir(self, source, dest):
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for root, dirs, files in os.walk(source):
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for dir_ in dirs:
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full_path = os.path.join(root, dir_)
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dest_full_path = os.path.join(dest, os.path.relpath(source,
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full_path))
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dir_stat = os.stat(dest_full_path)
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actual_perm = oct(dir_stat.st_mode)[-4:]
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if self.perm != actual_perm:
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LOG.error('Dest dir does not have expected perm: %s,'
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' actual %s', self.perm, actual_perm)
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return False
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for file_ in files:
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full_path = os.path.join(root, file_)
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dest_full_path = os.path.join(dest, os.path.relpath(full_path,
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source))
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if not self._cmp_file(full_path, dest_full_path):
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return False
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return True
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def check(self):
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bad_state_files = []
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sources = glob.glob(self.source)
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if not sources and not self.optional:
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raise MissingRequiredSource('%s file is not found' % self.source)
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elif self.optional and not sources:
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return
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for source in sources:
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dest = self.dest
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# dest endswith / means copy the <source> into <dest> folder,
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# otherwise means copy the source to dest
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if dest.endswith(os.sep):
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dest = os.path.join(dest, os.path.basename(source))
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if os.path.isdir(source):
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if not self._cmp_dir(source, dest):
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bad_state_files.append(source)
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elif not self._cmp_file(source, dest):
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bad_state_files.append(source)
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if len(bad_state_files) != 0:
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msg = 'Following files are in bad state: %s' % bad_state_files
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raise ConfigFileBadState(msg)
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def validate_config(config):
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required_keys = {'source', 'dest'}
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if 'command' not in config:
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raise InvalidConfig('Config is missing required "command" key')
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# Validate config sections
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for data in config.get('config_files', list()):
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# Verify required keys exist.
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if not set(data.keys()) >= required_keys:
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message = 'Config is missing required keys: %s' % required_keys
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raise InvalidConfig(message)
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if ('owner' not in data or 'perm' not in data) \
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and not data.get('preserve_properties', False):
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raise InvalidConfig(
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'Config needs preserve_properties or owner and perm')
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def validate_source(data):
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source = data.get('source')
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# Only check existence if no wildcard found
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if '*' not in source:
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if not os.path.exists(source):
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if data.get('optional'):
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LOG.info("%s does not exist, but is not required", source)
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return False
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else:
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raise MissingRequiredSource(
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"The source to copy does not exist: %s" % source)
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return True
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def load_config():
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def load_from_env():
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config_raw = os.environ.get("KOLLA_CONFIG")
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if config_raw is None:
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return None
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# Attempt to read config
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try:
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return json.loads(config_raw)
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except ValueError:
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raise InvalidConfig('Invalid json for Kolla config')
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def load_from_file():
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config_file = os.environ.get("KOLLA_CONFIG_FILE")
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if not config_file:
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config_file = '/var/lib/kolla/config_files/config.json'
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LOG.info("Loading config file at %s", config_file)
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# Attempt to read config file
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with open(config_file) as f:
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try:
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return json.load(f)
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except ValueError:
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raise InvalidConfig(
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"Invalid json file found at %s" % config_file)
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except IOError as e:
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raise InvalidConfig(
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"Could not read file %s: %r" % (config_file, e))
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config = load_from_env()
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if config is None:
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config = load_from_file()
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LOG.info('Validating config file')
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validate_config(config)
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return config
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def copy_config(config):
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if 'config_files' in config:
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LOG.info('Copying service configuration files')
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for data in config['config_files']:
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config_file = ConfigFile(**data)
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config_file.copy()
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else:
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LOG.debug('No files to copy found in config')
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LOG.info('Writing out command to execute')
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LOG.debug("Command is: %s", config['command'])
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# The value from the 'command' key will be written to '/run_command'
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cmd = '/run_command'
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with open(cmd, 'w+') as f:
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f.write(config['command'])
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# Make sure the generated file is readable by all users
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try:
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os.chmod(cmd, 0o644)
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except OSError:
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LOG.exception('Failed to set permission of %s to 0o644', cmd)
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def user_group(owner):
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if ':' in owner:
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user, group = owner.split(':', 1)
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if not group:
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group = user
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else:
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user, group = owner, owner
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return user, group
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def handle_permissions(config):
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for permission in config.get('permissions', list()):
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path = permission.get('path')
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owner = permission.get('owner')
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recurse = permission.get('recurse', False)
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perm = permission.get('perm')
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desired_user, desired_group = user_group(owner)
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uid = pwd.getpwnam(desired_user).pw_uid
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gid = grp.getgrnam(desired_group).gr_gid
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def set_perms(path, uid, gid, perm):
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LOG.info('Setting permission for %s', path)
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if not os.path.exists(path):
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LOG.warning('%s does not exist', path)
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return
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try:
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os.chown(path, uid, gid)
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except OSError:
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LOG.exception('Failed to change ownership of %s to %s:%s',
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path, uid, gid)
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if perm:
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# NOTE(Jeffrey4l): py3 need '0oXXX' format for octal literals,
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# and py2 support such format too.
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if len(perm) == 4 and perm[1] != 'o':
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perm = ''.join([perm[:1], 'o', perm[1:]])
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perm = int(perm, base=0)
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try:
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os.chmod(path, perm)
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except OSError:
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LOG.exception('Failed to set permission of %s to %s',
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path, perm)
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for dest in glob.glob(path):
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set_perms(dest, uid, gid, perm)
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if recurse and os.path.isdir(dest):
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for root, dirs, files in os.walk(dest):
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for dir_ in dirs:
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set_perms(os.path.join(root, dir_), uid, gid, perm)
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for file_ in files:
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set_perms(os.path.join(root, file_), uid, gid, perm)
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def execute_config_strategy(config):
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config_strategy = os.environ.get("KOLLA_CONFIG_STRATEGY")
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LOG.info("Kolla config strategy set to: %s", config_strategy)
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if config_strategy == "COPY_ALWAYS":
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copy_config(config)
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handle_permissions(config)
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elif config_strategy == "COPY_ONCE":
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if os.path.exists('/configured'):
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raise ImmutableConfig(
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"The config strategy prevents copying new configs",
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exit_code=0)
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else:
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copy_config(config)
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handle_permissions(config)
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os.mknod('/configured')
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else:
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raise InvalidConfig('KOLLA_CONFIG_STRATEGY is not set properly')
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def execute_config_check(config):
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for data in config.get('config_files', []):
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config_file = ConfigFile(**data)
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config_file.check()
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def main():
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try:
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parser = argparse.ArgumentParser()
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parser.add_argument('--check',
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action='store_true',
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required=False,
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help='Check whether the configs changed')
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args = parser.parse_args()
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config = load_config()
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if args.check:
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execute_config_check(config)
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else:
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execute_config_strategy(config)
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except ExitingException as e:
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LOG.error("%s: %s", e.__class__.__name__, e)
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return e.exit_code
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except Exception:
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LOG.exception('Unexpected error:')
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return 2
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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