fix(cyctl): add explicit completion command to prevent kubeconfig panic

cyctl/cmd/completion.go

@@ -0,0 +1,68 @@
+package cmd
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var completionCmd = &cobra.Command{
+	Use:   "completion [bash|zsh|fish|powershell]",
+	Short: "Generate completion script",
+	Long: `To load completions:
+
+Bash:
+	$ source <(cyctl completion bash)
+
+	# To load completions for each session, execute once:
+	# Linux:
+	$ cyctl completion bash > /etc/bash_completion.d/cyctl
+	# macOS:
+	$ cyctl completion bash > /usr/local/etc/bash_completion.d/cyctl
+
+Zsh:
+	# If shell completion is not already enabled in your environment,
+	# you will need to enable it.  You can execute the following once:
+
+	$ echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+	# To load completions for each session, execute once:
+	$ cyctl completion zsh > "${fpath[1]}/_cyctl"
+
+	# You will need to start a new shell for this setup to take effect.
+
+Fish:
+	$ cyctl completion fish | source
+
+	# To load completions for each session, execute once:
+	$ cyctl completion fish > ~/.config/fish/completions/cyctl.fish
+
+PowerShell:
+	PS> cyctl completion powershell | Out-String | Invoke-Expression
+
+	# To load completions for every PowerShell session, run:
+	PS> cyctl completion powershell > cyctl.ps1
+	# and source this file from your PowerShell profile.
+`,
+	DisableFlagsInUseLine: true,
+	ValidArgs:             []string{"bash", "zsh", "fish", "powershell"},
+	Args:                  cobra.MatchAll(cobra.ExactArgs(1), cobra.OnlyValidArgs),
+	// Override root's PersistentPreRun so kubeconfig is not loaded for completions
+	PersistentPreRun: func(cmd *cobra.Command, args []string) {},
+	Run: func(cmd *cobra.Command, args []string) {
+		switch args[0] {
+		case "bash":
+			cmd.Root().GenBashCompletion(os.Stdout)
+		case "zsh":
+			cmd.Root().GenZshCompletion(os.Stdout)
+		case "fish":
+			cmd.Root().GenFishCompletion(os.Stdout, true)
+		case "powershell":
+			cmd.Root().GenPowerShellCompletionWithDesc(os.Stdout)
+		}
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(completionCmd)
+}