137 lines
4.6 KiB
Python
137 lines
4.6 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011, Nicira Networks, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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# Borrowed from nova code base, more utilities will be added/borrowed as and
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# when needed.
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# @author: Somik Behera, Nicira Networks, Inc.
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"""Utilities and helper functions."""
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import os
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import signal
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import uuid
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from eventlet.green import subprocess
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from quantum.openstack.common import cfg
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from quantum.openstack.common import log as logging
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TIME_FORMAT = "%Y-%m-%dT%H:%M:%SZ"
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LOG = logging.getLogger(__name__)
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def boolize(subject):
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"""
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Quak like a boolean
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"""
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if isinstance(subject, bool):
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return subject
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elif isinstance(subject, basestring):
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sub = subject.strip().lower()
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if sub == 'true':
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return True
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elif sub == 'false':
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return False
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return subject
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def read_cached_file(filename, cache_info, reload_func=None):
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"""Read from a file if it has been modified.
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:param cache_info: dictionary to hold opaque cache.
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:param reload_func: optional function to be called with data when
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file is reloaded due to a modification.
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:returns: data from file
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"""
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mtime = os.path.getmtime(filename)
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if not cache_info or mtime != cache_info.get('mtime'):
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LOG.debug(_("Reloading cached file %s") % filename)
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with open(filename) as fap:
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cache_info['data'] = fap.read()
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cache_info['mtime'] = mtime
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if reload_func:
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reload_func(cache_info['data'])
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return cache_info['data']
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def find_config_file(options, config_file):
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"""
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Return the first config file found.
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We search for the paste config file in the following order:
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* If --config-file option is used, use that
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* Search for the configuration files via common cfg directories
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:retval Full path to config file, or None if no config file found
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"""
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fix_path = lambda p: os.path.abspath(os.path.expanduser(p))
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if options.get('config_file'):
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if os.path.exists(options['config_file']):
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return fix_path(options['config_file'])
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dir_to_common = os.path.dirname(os.path.abspath(__file__))
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root = os.path.join(dir_to_common, '..', '..', '..', '..')
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# Handle standard directory search for the config file
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config_file_dirs = [fix_path(os.path.join(os.getcwd(), 'etc')),
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fix_path(os.path.join('~', '.quantum-venv', 'etc',
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'quantum')),
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fix_path('~'),
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os.path.join(cfg.CONF.state_path, 'etc'),
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os.path.join(cfg.CONF.state_path, 'etc', 'quantum'),
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fix_path(os.path.join('~', '.local',
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'etc', 'quantum')),
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'/usr/etc/quantum',
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'/usr/local/etc/quantum',
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'/etc/quantum/',
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'/etc']
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if 'plugin' in options:
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config_file_dirs = [
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os.path.join(x, 'quantum', 'plugins', options['plugin'])
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for x in config_file_dirs
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]
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if os.path.exists(os.path.join(root, 'plugins')):
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plugins = [fix_path(os.path.join(root, 'plugins', p, 'etc'))
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for p in os.listdir(os.path.join(root, 'plugins'))]
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plugins = [p for p in plugins if os.path.isdir(p)]
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config_file_dirs.extend(plugins)
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for cfg_dir in config_file_dirs:
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cfg_file = os.path.join(cfg_dir, config_file)
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if os.path.exists(cfg_file):
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return cfg_file
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def str_uuid():
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"""Return a uuid as a string"""
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return str(uuid.uuid4())
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def _subprocess_setup():
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# Python installs a SIGPIPE handler by default. This is usually not what
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# non-Python subprocesses expect.
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signal.signal(signal.SIGPIPE, signal.SIG_DFL)
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def subprocess_popen(args, stdin=None, stdout=None, stderr=None, shell=False,
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env=None):
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return subprocess.Popen(args, shell=shell, stdin=stdin, stdout=stdout,
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stderr=stderr, preexec_fn=_subprocess_setup,
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env=env)
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