Minor agent version code cleanup

Internal to the conductor, we have long determiend that if no
agent version is submitted by the client, that the client is a
version 3.0.0 agent.

With agent token, we're effectively requiring 6.1.0 or later
to be leveraged, so all agents should be sending versions.

An agent not sending versions is thus unsupported and would no
longer work without agent token support.

Redudnant code has thus been removed. Additionally the conductor
utility is_agent_token_supported has been removed since it is now
redundant.

Change-Id: Id6c8d1df08c3ac7af61ed7d05d274f3099003582

2 files changed, 6 insertions, 13 deletions

diff --git a/ironic/conductor/manager.py b/ironic/conductor/manager.py
index 7860a125c..4d5b0f608 100644
--- a/ironic/conductor/manager.py
+++ b/ironic/conductor/manager.py
@@ -3120,7 +3120,12 @@ class ConductorManager(base_manager.BaseConductorManager):
         LOG.debug('RPC heartbeat called for node %s', node_id)
 
         if agent_version is None:
-            agent_version = '3.0.0'
+            LOG.error('Node %s transmitted no version information which '
+                      'indicates the agent is incompatible with the ironic '
+                      'services and must be upgraded.', node_id)
+            raise exception.InvalidParameterValue(
+                _('Agent did not transmit a version, and a version is '
+                  'required. Please update the agent being used.'))
 
         # NOTE(dtantsur): we acquire a shared lock to begin with, drivers are
         # free to promote it to an exclusive one.
diff --git a/ironic/conductor/utils.py b/ironic/conductor/utils.py
index ae481283c..473c3d478 100644
--- a/ironic/conductor/utils.py
+++ b/ironic/conductor/utils.py
@@ -15,7 +15,6 @@
 import contextlib
 import crypt
 import datetime
-from distutils.version import StrictVersion
 import functools
 import os
 import secrets
@@ -1173,17 +1172,6 @@ def is_agent_token_valid(node, token):
     return known_token == token
 
 
-def is_agent_token_supported(agent_version):
-    # NOTE(TheJulia): This is hoped that 6.x supports
-    # agent token capabilities and realistically needs to be updated
-    # once that version of IPA is out there in some shape or form.
-    # This allows us to gracefully allow older agent's that were
-    # launched via pre-generated agent_tokens, to still work
-    # and could likely be removed at some point down the road.
-    version = str(agent_version).replace('.dev', 'b', 1)
-    return StrictVersion(version) > StrictVersion('6.1.0')
-
-
 def is_agent_token_pregenerated(node):
     """Determines if the token was generated for out of band configuration.