Temp work around for missing select_auth_plugin()

These were removed prematurely from osc-lib (by me) but the real fix in
https://review.openstack.org/329189 is having racy functional test issues
that may be related to osc-lib, so let's clear this up while we fix that...

Change-Id: I8f67466967751fdf6fd24ae1b16ccee2aec52323

Author: Dean Troyer

openstackclient/common/clientmanager.py

@@ -20,6 +20,7 @@
 import pkg_resources
 import sys
 
+from keystoneauth1.loading import base
 from osc_lib.api import auth
 from osc_lib import exceptions
 from oslo_utils import strutils
@@ -37,6 +38,77 @@
 USER_AGENT = 'python-openstackclient'
 
 
+# NOTE(dtroyer): Bringing back select_auth_plugin() and build_auth_params()
+#                temporarily because osc-lib 0.3.0 removed it a wee bit early
+def select_auth_plugin(options):
+    """Pick an auth plugin based on --os-auth-type or other options"""
+
+    auth_plugin_name = None
+
+    # Do the token/url check first as this must override the default
+    # 'password' set by os-client-config
+    # Also, url and token are not copied into o-c-c's auth dict (yet?)
+    if options.auth.get('url') and options.auth.get('token'):
+        # service token authentication
+        auth_plugin_name = 'token_endpoint'
+    elif options.auth_type in auth.PLUGIN_LIST:
+        # A direct plugin name was given, use it
+        auth_plugin_name = options.auth_type
+    elif options.auth.get('username'):
+        if options.identity_api_version == '3':
+            auth_plugin_name = 'v3password'
+        elif options.identity_api_version.startswith('2'):
+            auth_plugin_name = 'v2password'
+        else:
+            # let keystoneauth figure it out itself
+            auth_plugin_name = 'password'
+    elif options.auth.get('token'):
+        if options.identity_api_version == '3':
+            auth_plugin_name = 'v3token'
+        elif options.identity_api_version.startswith('2'):
+            auth_plugin_name = 'v2token'
+        else:
+            # let keystoneauth figure it out itself
+            auth_plugin_name = 'token'
+    else:
+        # The ultimate default is similar to the original behaviour,
+        # but this time with version discovery
+        auth_plugin_name = 'password'
+    LOG.debug("Auth plugin %s selected", auth_plugin_name)
+    return auth_plugin_name
+
+
+def build_auth_params(auth_plugin_name, cmd_options):
+    if auth_plugin_name:
+        LOG.debug('auth_type: %s', auth_plugin_name)
+        auth_plugin_loader = base.get_plugin_loader(auth_plugin_name)
+        auth_params = {
+            opt.dest: opt.default
+            for opt in base.get_plugin_options(auth_plugin_name)
+        }
+        auth_params.update(dict(cmd_options.auth))
+        # grab tenant from project for v2.0 API compatibility
+        if auth_plugin_name.startswith("v2"):
+            if 'project_id' in auth_params:
+                auth_params['tenant_id'] = auth_params['project_id']
+                del auth_params['project_id']
+            if 'project_name' in auth_params:
+                auth_params['tenant_name'] = auth_params['project_name']
+                del auth_params['project_name']
+    else:
+        LOG.debug('no auth_type')
+        # delay the plugin choice, grab every option
+        auth_plugin_loader = None
+        auth_params = dict(cmd_options.auth)
+        plugin_options = set(
+            [o.replace('-', '_') for o in auth.get_options_list()]
+        )
+        for option in plugin_options:
+            LOG.debug('fetching option %s', option)
+            auth_params[option] = getattr(cmd_options.auth, option, None)
+    return (auth_plugin_loader, auth_params)
+
+
 class ClientCache(object):
     """Descriptor class for caching created client handles."""
 
@@ -193,7 +265,7 @@ def setup_auth(self):
 
         # If no auth type is named by the user, select one based on
         # the supplied options
-        self.auth_plugin_name = auth.select_auth_plugin(self._cli_options)
+        self.auth_plugin_name = select_auth_plugin(self._cli_options)
 
         # Basic option checking to avoid unhelpful error messages
         auth.check_valid_authentication_options(self._cli_options,
@@ -205,7 +277,7 @@ def setup_auth(self):
                 not self._cli_options.auth.get('password')):
             self._cli_options.auth['password'] = self._pw_callback()
 
-        (auth_plugin, self._auth_params) = auth.build_auth_params(
+        (auth_plugin, self._auth_params) = build_auth_params(
             self.auth_plugin_name,
             self._cli_options,
         )