279 lines
7.9 KiB
Python
279 lines
7.9 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 contextlib
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import json
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import logging
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import os
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from pwd import getpwnam
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import shutil
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import sys
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from kazoo import client as kz_client
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from kazoo import exceptions as kz_exceptions
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from six.moves.urllib import parse
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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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def validate_config(config):
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required_keys = {'source', 'dest', 'owner', 'perm'}
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if 'command' not in config:
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LOG.error('Config is missing required "command" key')
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sys.exit(1)
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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 data.viewkeys() >= required_keys:
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LOG.error("Config is missing required keys: %s", data)
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sys.exit(1)
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def validate_source(data):
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source = data.get('source')
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if is_zk_transport(source):
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with zk_connection(source) as zk:
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exists = zk_path_exists(zk, source)
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else:
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exists = os.path.exists(source)
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if not exists:
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if data.get('optional'):
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LOG.warning("%s does not exist, but is not required", source)
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return False
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else:
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LOG.error("The source to copy does not exist: %s", source)
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sys.exit(1)
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return True
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def is_zk_transport(path):
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return path.startswith('zk://') or \
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os.environ.get("KOLLA_ZK_HOSTS") is not None
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@contextlib.contextmanager
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def zk_connection(url):
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# support an environment and url
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# if url, it should be like this:
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# zk://<address>:<port>/<path>
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zk_hosts = os.environ.get("KOLLA_ZK_HOSTS")
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if zk_hosts is None:
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components = parse.urlparse(url)
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zk_hosts = components.netloc
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zk = kz_client.KazooClient(hosts=zk_hosts)
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zk.start()
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try:
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yield zk
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finally:
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zk.stop()
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def zk_path_exists(zk, path):
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try:
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components = parse.urlparse(path)
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zk.get(components.path)
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return True
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except kz_exceptions.NoNodeError:
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return False
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def zk_copy_tree(zk, src, dest):
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"""Recursively copy contents of url_source into dest."""
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data, stat = zk.get(src)
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if data:
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dest_path = os.path.dirname(dest)
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if not os.path.exists(dest_path):
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LOG.info("Creating dest parent directory: %s", dest_path)
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os.makedirs(dest_path)
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LOG.info("Copying %s to %s", src, dest)
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with open(dest, 'w') as df:
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df.write(data.decode("utf-8"))
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try:
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children = zk.get_children(src)
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except kz_exceptions.NoNodeError:
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return
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for child in children:
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zk_copy_tree(zk, os.path.join(src, child),
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os.path.join(dest, child))
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def copy_files(data):
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dest = data.get('dest')
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source = data.get('source')
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if os.path.exists(dest):
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LOG.info("Removing existing destination: %s", dest)
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if os.path.isdir(dest):
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shutil.rmtree(dest)
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else:
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os.remove(dest)
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if is_zk_transport(source):
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with zk_connection(source) as zk:
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components = parse.urlparse(source)
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return zk_copy_tree(zk, components.path, dest)
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if os.path.isdir(source):
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source_path = source
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dest_path = dest
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else:
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source_path = os.path.dirname(source)
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dest_path = os.path.dirname(dest)
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if not os.path.exists(dest_path):
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LOG.info("Creating dest parent directory: %s", dest_path)
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os.makedirs(dest_path)
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if source != source_path:
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# Source is file
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LOG.info("Copying %s to %s", source, dest)
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shutil.copy(source, dest)
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else:
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# Source is a directory
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for src in os.listdir(source_path):
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LOG.info("Copying %s to %s",
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os.path.join(source_path, src), dest_path)
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if os.path.isdir(src):
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shutil.copytree(os.path.join(source_path, src), dest_path)
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else:
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shutil.copy(os.path.join(source_path, src), dest_path)
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def set_permissions(data):
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def set_perms(file_, uid, guid, perm):
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LOG.info("Setting permissions for %s", file_)
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# Give config file proper perms.
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try:
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os.chown(file_, uid, gid)
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os.chmod(file_, perm)
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except OSError as e:
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LOG.error("Error while setting permissions for %s: %r", file_, e)
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sys.exit(1)
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dest = data.get('dest')
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owner = data.get('owner')
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perm = int(data.get('perm'), 0)
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# Check for user and group id in the environment.
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try:
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user = getpwnam(owner)
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except KeyError:
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LOG.error("The specified user does not exist: %s", owner)
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sys.exit(1)
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uid = user.pw_uid
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gid = user.pw_gid
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# Set permissions on the top level dir or file
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set_perms(dest, uid, gid, perm)
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if os.path.isdir(dest):
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# Recursively set permissions
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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 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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LOG.error('Invalid json for Kolla config')
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sys.exit(1)
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def load_from_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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LOG.error("Invalid json file found at %s", config_file)
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sys.exit(1)
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except IOError as e:
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LOG.error("Could not read file %s: %r", config_file, e)
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sys.exit(1)
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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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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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if validate_source(data):
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copy_files(data)
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set_permissions(data)
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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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with open('/run_command', 'w+') as f:
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f.write(config['command'])
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def execute_config_strategy():
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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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load_config()
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elif config_strategy == "COPY_ONCE":
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if os.path.exists('/configured'):
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LOG.info("The config strategy prevents copying new configs")
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sys.exit(0)
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else:
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load_config()
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os.mknod('/configured')
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else:
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LOG.error('KOLLA_CONFIG_STRATEGY is not set properly')
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sys.exit(1)
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def main():
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execute_config_strategy()
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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