54 lines
1.5 KiB
Go
54 lines
1.5 KiB
Go
package cluster
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import (
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"fmt"
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"k8s.io/client-go/discovery"
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"k8s.io/client-go/tools/clientcmd"
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)
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// DetectServerVersion detects the Kubernetes server version by connecting to the cluster.
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// It returns the version in the format "major.minor.patch" (e.g., "1.34.1").
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// Returns an error if detection fails.
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func DetectServerVersion(kubeconfig, context string) (string, error) {
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// Build the kubeconfig
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loadingRules := clientcmd.NewDefaultClientConfigLoadingRules()
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if kubeconfig != "" {
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loadingRules.ExplicitPath = kubeconfig
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}
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configOverrides := &clientcmd.ConfigOverrides{}
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if context != "" {
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configOverrides.CurrentContext = context
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}
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config, err := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
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loadingRules,
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configOverrides,
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).ClientConfig()
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if err != nil {
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return "", fmt.Errorf("failed to load kubeconfig: %w", err)
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}
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// Create discovery client
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discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
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if err != nil {
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return "", fmt.Errorf("failed to create discovery client: %w", err)
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}
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// Get server version
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serverVersion, err := discoveryClient.ServerVersion()
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if err != nil {
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return "", fmt.Errorf("failed to get server version: %w", err)
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}
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// ServerVersion.GitVersion includes "v" prefix (e.g., "v1.34.1")
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// Strip the "v" prefix to match Helm's --kube-version format (e.g., "1.34.1")
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version := serverVersion.GitVersion
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if len(version) > 0 && version[0] == 'v' {
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version = version[1:]
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}
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return version, nil
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}
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