/usr/lib/python2.7/dist-packages/keystoneauth1/loading/cli.py is in python-keystoneauth1 3.4.0-0ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 | # 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 argparse
import os
from keystoneauth1.loading import base
__all__ = ('register_argparse_arguments',
'load_from_argparse_arguments')
def _register_plugin_argparse_arguments(parser, plugin):
for opt in plugin.get_options():
parser.add_argument(*opt.argparse_args,
default=opt.argparse_default,
metavar=opt.metavar,
help=opt.help,
dest='os_%s' % opt.dest)
def register_argparse_arguments(parser, argv, default=None):
"""Register CLI options needed to create a plugin.
The function inspects the provided arguments so that it can also register
the options required for that specific plugin if available.
:param parser: the parser to attach argparse options to.
:type parser: argparse.ArgumentParser
:param list argv: the arguments provided to the appliation.
:param str/class default: a default plugin name or a plugin object to use
if one isn't specified by the CLI. default: None.
:returns: The plugin class that will be loaded or None if not provided.
:rtype: :class:`keystoneauth1.plugin.BaseAuthPlugin`
:raises keystoneauth1.exceptions.auth_plugins.NoMatchingPlugin:
if a plugin cannot be created.
"""
in_parser = argparse.ArgumentParser(add_help=False)
env_plugin = os.environ.get('OS_AUTH_TYPE',
os.environ.get('OS_AUTH_PLUGIN', default))
for p in (in_parser, parser):
p.add_argument('--os-auth-type',
'--os-auth-plugin',
metavar='<name>',
default=env_plugin,
help='Authentication type to use')
options, _args = in_parser.parse_known_args(argv)
if not options.os_auth_type:
return None
if isinstance(options.os_auth_type, base.BaseLoader):
msg = 'Default Authentication options'
plugin = options.os_auth_type
else:
msg = 'Options specific to the %s plugin.' % options.os_auth_type
plugin = base.get_plugin_loader(options.os_auth_type)
group = parser.add_argument_group('Authentication Options', msg)
_register_plugin_argparse_arguments(group, plugin)
return plugin
def load_from_argparse_arguments(namespace, **kwargs):
"""Retrieve the created plugin from the completed argparse results.
Loads and creates the auth plugin from the information parsed from the
command line by argparse.
:param Namespace namespace: The result from CLI parsing.
:returns: An auth plugin, or None if a name is not provided.
:rtype: :class:`keystoneauth1.plugin.BaseAuthPlugin`
:raises keystoneauth1.exceptions.auth_plugins.NoMatchingPlugin:
if a plugin cannot be created.
"""
if not namespace.os_auth_type:
return None
if isinstance(namespace.os_auth_type, type):
plugin = namespace.os_auth_type
else:
plugin = base.get_plugin_loader(namespace.os_auth_type)
def _getter(opt):
return getattr(namespace, 'os_%s' % opt.dest)
return plugin.load_from_options_getter(_getter, **kwargs)
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