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#!/usr/bin/env python
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import json
import logging
import os
from pwd import getpwnam
import shutil
import sys
# TODO(rhallisey): add docstring.
logging.basicConfig()
LOG = logging.getLogger(__name__)
LOG.setLevel(logging.INFO)
def validate_config(config):
required_keys = {'source', 'dest', 'owner', 'perm'}
if 'command' not in config:
LOG.error('Config is missing required "command" key')
sys.exit(1)
# Validate config sections
for data in config.get('config_files', list()):
# Verify required keys exist. Only 'source' and 'dest' are
# required. 'owner' and 'perm' should user system defaults if not
# specified
if not data.viewkeys() >= required_keys:
LOG.error('Config is missing required keys: {}'.format(data))
sys.exit(1)
def copy_files(data):
dest = data.get('dest')
source = data.get('source')
if not os.path.exists(source):
LOG.error('The source to copy does not exist: {}'.format(source))
sys.exit(1)
if os.path.exists(dest):
LOG.info('Removing existing destination: {}'.format(dest))
if os.path.isdir(dest):
shutil.rmtree(dest)
else:
os.remove(dest)
if os.path.isdir(source):
source_path = source
dest_path = dest
else:
source_path = os.path.dirname(source)
dest_path = os.path.dirname(dest)
if not os.path.exists(dest_path):
LOG.info('Creating dest parent directory: {}'.format(dest_path))
os.makedirs(dest_path)
if source != source_path:
# Source is file
LOG.info('Copying {} to {}'.format(source, dest))
shutil.copy(source, dest)
else:
# Source is a directory
for src in os.listdir(source_path):
LOG.info('Copying {} to {}'.format(src, dest_path))
if os.path.isdir(src):
shutil.copytree(src, dest_path)
else:
shutil.copy(src, dest_path)
def set_permissions(data):
def set_perms(file_, uid, guid, perm):
LOG.info('Setting permissions for {}'.format(file_))
# Give config file proper perms.
try:
os.chown(file_, uid, gid)
except OSError as e:
LOG.error('While trying to chown {} received error: {}'.format(
file_, e))
sys.exit(1)
try:
os.chmod(file_, perm)
except OSError as e:
LOG.error('While trying to chmod {} received error: {}'.format(
file_, e))
sys.exit(1)
dest = data.get('dest')
owner = data.get('owner')
perm = int(data.get('perm'), 0)
# Check for user and group id in the environment.
try:
uid = getpwnam(owner).pw_uid
except KeyError:
LOG.error('The specified user does not exist: {}'.format(owner))
sys.exit(1)
try:
gid = getpwnam(owner).pw_gid
except KeyError:
LOG.error('The specified group does not exist: {}'.format(owner))
sys.exit(1)
# Set permissions on the top level dir or file
set_perms(dest, uid, gid, perm)
if os.path.isdir(dest):
# Recursively set permissions
for root, dirs, files in os.walk(dest):
for dir_ in dirs:
set_perms(os.path.join(root, dir_), uid, gid, perm)
for file_ in files:
set_perms(os.path.join(root, file_), uid, gid, perm)
def load_config():
config_file = '/opt/kolla/config_files/config.json'
LOG.info('Loading config file at {}'.format(config_file))
# Attempt to read config file
with open(config_file) as f:
try:
config = json.load(f)
except ValueError:
LOG.error('Invalid json file found at {}'.format(config_file))
sys.exit(1)
except IOError as e:
LOG.error('Could not read file {}. Failed with error {}'.format(
config_file, e))
sys.exit(1)
LOG.info('Validating config file')
validate_config(config)
if 'config_files' in config:
LOG.info('Copying service configuration files')
for data in config['config_files']:
copy_files(data)
set_permissions(data)
else:
LOG.debug('No files to copy found in config')
LOG.info('Writing out command to execute')
LOG.debug('Command is: {}'.format(config['command']))
# The value from the 'command' key will be written to '/run_command'
with open('/run_command', 'w+') as f:
f.write(config['command'])
def execute_config_strategy():
try:
config_strategy = os.environ.get("KOLLA_CONFIG_STRATEGY")
LOG.info('Kolla config strategy set to: {}'.format(config_strategy))
except KeyError:
LOG.error("KOLLA_CONFIG_STRATEGY is not set properly.")
sys.exit(1)
if config_strategy == "COPY_ALWAYS":
load_config()
elif config_strategy == "COPY_ONCE":
if os.path.exists('/configured'):
LOG.info("The config strategy prevents copying new configs")
sys.exit(0)
else:
load_config()
f = open('/configured', 'w+')
f.close()
else:
LOG.error('KOLLA_CONFIG_STRATEGY is not set properly')
sys.exit(1)
def main():
execute_config_strategy()
return 0
if __name__ == "__main__":
sys.exit(main())
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