Allow user to get version without a server

Author: jmckulk

docs/content/reference/pgo_version.md

@@ -38,7 +38,8 @@ Operator Version: v5.5.0
 ### Options
 
 ```
-  -h, --help   help for version
+      --client   If true, shows client version only (no server required).
+  -h, --help     help for version
 ```
 
 ### Options inherited from parent commands

internal/cmd/version.go

@@ -47,6 +47,9 @@ func newVersionCommand(config *internal.Config) *cobra.Command {
 	// No arguments for 'version'
 	cmd.Args = cobra.NoArgs
 
+	var clientOnly bool
+	cmd.Flags().BoolVar(&clientOnly, "client", false, "If true, shows client version only (no server required).")
+
 	cmd.Example = internal.FormatExample(fmt.Sprintf(`# Request the version of the client and the operator
 pgo version
 
@@ -57,6 +60,9 @@ Operator Version: v5.5.0`, clientVersion))
 	cmd.RunE = func(cmd *cobra.Command, args []string) error {
 
 		cmd.Printf("Client Version: %s\n", clientVersion)
+		if clientOnly {
+			return nil
+		}
 
 		ctx := context.Background()
 		restConfig, err := config.ToRESTConfig()

testing/kuttl/e2e/version/01--check-client-version.yaml

@@ -0,0 +1,14 @@
+apiVersion: kuttl.dev/v1beta1
+kind: TestStep
+commands:
+# The following test should check that the client version output is returned
+# when a kubernetes cluster is not available
+- script: |
+    contains() { bash -ceu '[[ "$1" == *"$2"* ]]' - "$@"; }
+
+    VERSION_OUTPUT=$(KUBECONFIG=blah kubectl pgo version --client)
+
+    { contains "${VERSION_OUTPUT}" "Client Version:"; } || {
+      echo ${VERSION_OUTPUT}
+      exit 1
+    }