fix error checking in validateIfName

[myl2821]

In some cases, calling netlink.LinkByName(ifname) with a non-existent ifname returns an error with the message "Link %s not found". As a result, validateIfName incorrectly fails in this scenario.

This PR addresses the issue by handling the "link not found" case properly.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the robustness of network interface validation by updating the error handling logic within the validateIfName function. Previously, the function relied on string comparison to detect 'Link not found' errors, which could be brittle. The change introduces a more reliable type assertion for netlink.LinkNotFoundError, ensuring that the system accurately recognizes when a specified network link does not exist and handles it gracefully, preventing unnecessary validation failures.

Highlights

• Improved Error Handling: The error checking mechanism in validateIfName has been refined to correctly identify and handle netlink.LinkNotFoundError using type assertion, replacing a less robust string-based comparison.

Changelog

• pkg/multus/multus.go
  • Updated error checking for netlink.LinkByName to use type assertion for netlink.LinkNotFoundError.

Activity

• No specific activity (comments, reviews) has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request refactors the error handling in validateIfName to use type assertion instead of string comparison for netlink.LinkNotFoundError. This is a good improvement that makes the error check more robust. My review includes a suggestion to further align the error handling with the patterns used elsewhere in the file for better consistency.