Add unit tests for ironic.py pure helpers

[berendt]

Closes #2226.

Adds tests/unit/tasks/conductor/test_ironic_helpers.py covering the pure
helpers and the _prepare_node_attributes builder in
osism/tasks/conductor/ironic.py — everything testable without the full
sync orchestration (the sync entry points stay in the companion sub-issue).

Change set

A single new test module (no production code touched), organized by helper:

• _derive_as_from_hostname_yrzn — storage vs. non-storage type digit,
  < 5 parts → None, single-digit padding, already-two-digit values left
  alone.
• _get_metalbox_primary_ip4_fallback — invalid YAML, non-list setting,
  non-dict element skipped, tag stripped + role="metalbox" added (asserted
  via captured filter kwargs), first/second metalbox IP selection, and the
  two no-IP / no-metalbox warning paths.
• _get_metalbox_primary_ip4 — no OOB IP (fallback not called), subnet
  match, no-match → fallback, matching subnet but no primary_ip4 → early
  None (no fallback), match on the second interface, and IPv4/IPv6 mixing.
• _render_templates — flat/nested dict, nested list, list of dicts,
  non-template and non-string values untouched, multiple vars, in-place
  mutation returning None.
• _prepare_node_attributes — base/config-context/custom-field merging
  and order, driver pruning, template variables (board creds, OOB address,
  ironic_osism_* propagation), osism-ipa-type=yrzn001 kernel enrichment
  (frr params, metalbox, AS fallback, unknown type), skip_kernel_params,
  extra_kernel_params, driver_info persistence, extra serialization, and
  the returned tuple.
• _prettify_for_display — JSON parsing in extra, non-JSON left
  untouched, deep copy with/without extra.

Mocking notes

• Module-level collaborators (deep_decrypt, deep_merge, get_vault,
  get_device_oob_ip, SUPPORTED_IPA_TYPES, _derive_as_from_hostname_yrzn,
  _get_metalbox_primary_ip4) are patched at osism.tasks.conductor.ironic.*.
• The NetBox client is patched via osism.utils.nb (with create=True), which
  is what the helpers' local from osism import utils resolves to — matching
  the existing test_netbox.py and sonic test fixtures. ironic.py has no
  module-level utils attribute (it imports it as osism_utils), so the
  literal osism.tasks.conductor.ironic.utils.nb path from the issue is not a
  valid patch target; osism.utils.nb is the established equivalent.
• deep_decrypt / deep_merge are stubbed as no-ops; their real behavior is
  covered by the conductor.utils tests, so the merge cases assert call
  identity/order rather than merged output.

Deviation from the issue

The issue lists _derive_as_from_hostname_yrzn("comp-nw-22-3-7-1") →
"4200143307". The implementation pads rack/server and produces
"4200140703" (matches the function's own docstring example
stor-nw-22-60-59-6 → 4200155960). The test encodes the verified value
"4200140703"; the same case (non-storage type 4, single-digit padding) is
still covered.

Verification

• black --check, flake8 — pass on the new file.
• pytest / coverage — left to the python-osism-unit-tests Zuul job.

AI-assisted: Claude Code

[sourcery-ai]

Hey - I've left some high level feedback:

• The local _YRZN_MAPPING test fixture duplicates the SUPPORTED_IPA_TYPES structure and can silently diverge from the real mapping over time; consider deriving it from SUPPORTED_IPA_TYPES at runtime (e.g. SUPPORTED_IPA_TYPES['yrzn001'].copy() or similar) and only overriding what needs to be controlled for the tests.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The local `_YRZN_MAPPING` test fixture duplicates the `SUPPORTED_IPA_TYPES` structure and can silently diverge from the real mapping over time; consider deriving it from `SUPPORTED_IPA_TYPES` at runtime (e.g. `SUPPORTED_IPA_TYPES['yrzn001'].copy()` or similar) and only overriding what needs to be controlled for the tests.

---

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[ideaship]

Production bug exposed by the coverage gap (osism/tasks/conductor/utils.py)

_prepare_node_attributes() returns a 2-tuple (node_attributes, template_vars) (ironic.py:332). Two callers in utils.py still treat the return value as a dict:

• _get_conductor_redfish_credentials (utils.py:223, then utils.py:227)
• _get_conductor_redfish_address (utils.py:255, then utils.py:259)

Both do node_attributes = _prepare_node_attributes(...) and then if "driver_info" in node_attributes and node_attributes.get("driver") == "redfish":. Because node_attributes is now a tuple, "driver_info" in node_attributes is a tuple-membership test — is the string equal to one of the two dict elements? — which is always False. The if short-circuits before .get() is ever reached, so no exception is raised and nothing is logged: both functions silently return None, None / None regardless of the device's actual configuration.

What this actually breaks. These two helpers are the conductor-configuration fallback for Redfish, and they are the only source of credentials for the osism redfish list <hostname> <EthernetInterfaces|NetworkAdapters|NetworkDeviceFunctions> command. All three internal call sites call get_redfish_connection(hostname, ignore_ssl_errors=True) with no username/password, so:

• if not username or not password: is always true → _get_conductor_redfish_credentials is invoked on every call to that command, and get_redfish_connection never reads credentials from Ironic driver_info (it only pulls redfish_address from there). With the bug, credentials always come back None, None, the BMC connection is built with SessionOrBasicAuth(username=None, password=None), and against any BMC that requires authentication the Redfish call fails, the exception is swallowed in redfish.py, and the command returns an empty list / "Could not establish Redfish connection" — with no hint that credentials were dropped. In practice the conductor-credential fallback is dead.
• The address fallback (_get_conductor_redfish_address) likewise returns None, so base_url silently stays at the default https://{hostname} instead of the conductor-configured address. Lower impact (it degrades rather than hard-fails), but still wrong.

The tuple return was introduced in 0e66cb8, which changed ironic.py but never updated these two utils.py callers; test_utils.py has zero coverage of either function, so nothing in the suite catches it. This test-only PR cannot catch it by design — it never exercises the utils.py consumers — so flagging it for a separate fix.

Fix: unpack at both call sites — node_attributes, _ = _prepare_node_attributes(...) — and add a regression test for _get_conductor_redfish_credentials and _get_conductor_redfish_address.