INNER CODE UNIT · Go

verifyKubernetesVersion

fluxcd/flagger · cmd/flagger/main.go:423

func verifyKubernetesVersion(kubeClient kubernetes.Interface, logger *zap.SugaredLogger) {
	ver, err := kubeClient.Discovery().ServerVersion()
	if err != nil {
		logger.Fatalf("Error calling Kubernetes API: %v", err)
	}

	k8sVersionConstraint := "^1.11.0"

	// We append -alpha.1 to the end of our version constraint so that prebuilds of later versions
	// are considered valid for our purposes, as well as some managed solutions like EKS where they provide
	// a version like `v1.12.6-eks-d69f1b`. It doesn't matter what the prelease value is here, just that it
	// exists in our constraint.
	semverConstraint, err := semver.NewConstraint(k8sVersionConstraint + "-alpha.1")
	if err != nil {
		logger.Fatalf("Error parsing kubernetes version constraint: %v", err)
	}

	k8sSemver, err := semver.NewVersion(ver.GitVersion)

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