Return a warning if version of kubectl is not compatible with the version of k8s server.

versions.py

import subprocess
import yaml


def check_kubectl_compatibility_yaml():
    """Checks compatibility between kubectl client and server versions using YAML output."""

    version_output = subprocess.check_output(["kubectl", "version", "--output=yaml"]).decode("utf-8")

    version_data = yaml.safe_load(version_output)

    kubectl_client_version_raw = version_data["clientVersion"]["gitVersion"]
    server_version_raw = version_data["serverVersion"]["gitVersion"]

    def convert_version_to_matrix_format(version):
        parts = version.lstrip('v').split('.')
        return '.'.join(parts[:2]) + '.x'  # Returns format like '1.27.x'

    kubectl_client_version_converted = convert_version_to_matrix_format(kubectl_client_version_raw)
    server_version_converted = convert_version_to_matrix_format(server_version_raw)

    # Compatibility matrix (adjust based on official documentation)
    compatibility_matrix = {
        "1.27.x": ["1.26.x", "1.27.x", "1.28.x"],
        "1.26.x": ["1.25.x", "1.26.x", "1.27.x"],
        "1.25.x": ["1.24.x", "1.25.x", "1.26.x"],
        # ... Add more entries as needed
    }

    compatible = kubectl_client_version_converted in compatibility_matrix.get(server_version_converted, [])

    if not compatible:
        print("WARNING: Kubectl version", kubectl_client_version_raw, "is not fully compatible with server version",
              server_version_raw)
        print("Recommended client versions for server", 
              server_version_raw + ":", compatibility_matrix.get(server_version_converted))


if __name__ == "__main__":
    check_kubectl_compatibility_yaml()