tls_manager: port tls partial files handling back to v0.20.x-branch

[mohamedawnallah]

backports #10399.

[gemini-code-assist]

Summary of Changes

Hello @mohamedawnallah, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request backports a crucial fix to the v0.20.x-branch that enhances the resilience of the TLS manager. The change addresses an issue where the system could fail to initialize if only a partial TLS certificate/key pair was found on disk. By adjusting the regeneration logic and adding comprehensive tests, the TLS manager now reliably ensures that a complete and valid TLS pair is always present, preventing potential startup errors and improving overall system stability.

Highlights

• TLS Manager Robustness: The TLS manager has been updated to correctly handle scenarios where only one of the TLS certificate or key files exists. Previously, this could lead to startup failures.
• Conditional Logic Update: The generateCertPair function in tls_manager.go was modified to check for the existence of both the certificate and key files before deciding not to regenerate them. This ensures that if one is missing, both are regenerated.
• New Test Case: A new test, TestGenerateCertPairWithPartialFiles, was added to tls_manager_test.go to verify that the TLS manager successfully regenerates the certificate and key pair when only one of the files is present.
• Release Notes Update: The release notes for 0.20.1 have been updated to include this fix, providing clarity on the improved TLS manager behavior.

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[gemini-code-assist]

Code Review

This pull request backports a fix to the TLS manager to correctly handle cases where only one of the TLS certificate/key pair files exists on startup. The core logic change is simple and correct, changing an || to an && to ensure that the certificate pair is regenerated if either file is missing. A comprehensive table-driven test has been added to verify this new behavior for both partial file scenarios, which is great. My feedback is minor, focusing on improving the new test's maintainability by adding descriptive messages to assertions, which will aid in debugging potential future failures.

[saubyk]

Ack.

Unsure about the change to the release notes though.

[saubyk]

Do we need to make this change in the release notes in the back port pr? I am assuming it was handled in the original merge to master

[mohamedawnallah]

Do we need to make this change in the release notes in the back port pr? I am assuming it was handled in the original merge to master

It mirrors this merged one: 2590593 as part of #10418