fix(e2e): Wait for nodes to reboot

[qinqon]

What this PR does / why we need it:
The test were rebooting nodes and they were directly eventually checking NNCPs, this can introduce race conditions since how much time it takes for nodes to reboot is quite random, this fix add a explicit wait of node readiness, if it fails we will know for sure that the node didn't fully reboot instead of weird "Missing enacment" error.

Release note:

NONE

[gemini-code-assist]

Summary of Changes

Hello @qinqon, 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 significantly improves the reliability of end-to-end tests by addressing a critical timing issue that occurred after node reboots. By incorporating a specific waiting mechanism for nodes to become fully ready before proceeding with further checks, the tests will now more accurately assess the system's state, thereby reducing flaky test failures caused by race conditions and premature assertions.

Highlights

• E2E Test Reliability: Introduced explicit waits for node readiness after rebooting nodes in e2e tests to prevent race conditions and "Missing enactment" errors, ensuring tests accurately reflect node state.

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[gemini-code-assist]

Code Review

This pull request aims to fix a race condition in e2e tests by adding an explicit wait for nodes to reboot. While the intention is correct, the implementation of the waiting function waitForNodeToStart is flawed and does not actually wait for the node to become ready. This makes the added waits ineffective. I've left a detailed comment explaining the issue and a suggestion for a fix to the waitForNodeToStart function, which is necessary for this PR to achieve its goal.

[gemini-code-assist]

The waitForNodeToStart function has a logic issue that prevents it from waiting for the node to reboot. When the node is down and unreachable, runner.RunAtNode inside waitForNodeToStart will fail. The function will then return the string "not yet". The Eventually block checks ShouldNot(Equal("up")). Since "not yet" is not equal to "up", the check passes, and waitForNodeToStart returns immediately without actually waiting for the node to be ready. This defeats the purpose of adding this wait.

The current implementation of waitForNodeToStart in test/e2e/handler/utils.go is:

func waitForNodeToStart(node string) {
	Byf("Waiting till node %s is rebooted", node)
	// It will wait till uptime -p will return up that means that node was currently rebooted and is 0 min up
	Eventually(func() string {
		output, err := runner.RunAtNode(node, "uptime", "-p")
		if err != nil {
			return "not yet"
		}
		return output
	}, 300*time.Second, 5*time.Second).ShouldNot(Equal("up"), fmt.Sprintf("Node %s failed to start after reboot", node))
}

To correctly wait for the node to be ready, the function should wait for the runner.RunAtNode command to succeed. A corrected implementation would look like this:

func waitForNodeToStart(node string) {
	Byf("Waiting till node %s is rebooted", node)
	Eventually(func() error {
		_, err := runner.RunAtNode(node, "uptime")
		return err
	}, 5*time.Minute, 5*time.Second).Should(Succeed(), fmt.Sprintf("Node %s failed to start after reboot", node))
}

Since utils.go is not part of this PR's changes, I recommend also including the fix for waitForNodeToStart in this pull request for the intended fix to be effective.

[mkowalski]

@qinqon is this a valid one or yet another hallucination?

[mkowalski]

@gemini-code-review, we have reviewed this manually and what you wrote is not true. Explain yourself. Do better than last time.

[mkowalski]

/test pull-kubernetes-nmstate-e2e-handler-k8s

[mkowalski]

@gemini-code-review full review

[mkowalski]

/lgtm
/approve

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mkowalski

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