kubernetes-client/python

CRD version properties are inadvertently removed when serializing

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#2,436 opened on Aug 14, 2025

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 (3 comments) (0 reactions) (1 assignee)Python (6,225 stars) (3,323 forks)batch import
help wantedkind/bug

Description

Summary

I am loading a V1CustomResourceDefinition, making a small modification to it, then re-serializing it, and I am seeing numerous unintended mutations / removals made to the resulting output CRD

Similar defect as:

Details

Here are the sequence of diffs for my CRD:

@@ -17,111 +16,12 @@

   group: mycr.me.com
   names:
     kind: MyCR
-    listKind: MyCRList
     plural: mycrs
     singular: mycr

...

-  ... (Removed additionalPrinterColumns)
-  ... (Removed the entire version schema)
+  - name: v1beta1
+    schema: {}

Contributor guide

Tech stack
pythonrest api
Domain
backendapi
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Python kubernetes client basicsUnderstanding of CRD structureKnowledge of JSON serialization
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Start by examining the serialization logic for V1CustomResourceDefinition in the Python client. The issue is similar to #2435, so review the fix for that issue. Look at how version properties are handled during serialization, particularly the 'preserveUnknownFields' or schema handling. Check files in kubernetes/client/models/ and any custom serializers. Attempt to reproduce the bug using the provided CRD example and trace the serialization path.