Add arg length constraint to commands

cmd/apply.go

@@ -16,6 +16,7 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -60,6 +61,10 @@ var applyCmd = &cobra.Command{
 	Use:   "apply [env-name] [-f <file-or-dir>]",
 	Short: `Apply local configuration to remote cluster`,
 	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) > 1 {
+			return fmt.Errorf("'apply' takes at most a single argument, that is the name of the environment")
+		}
+
 		flags := cmd.Flags()
 		var err error
 

cmd/delete.go

@@ -16,6 +16,7 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -38,6 +39,10 @@ var deleteCmd = &cobra.Command{
 	Use:   "delete [env-name] [-f <file-or-dir>]",
 	Short: "Delete Kubernetes resources described in local config",
 	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) > 1 {
+			return fmt.Errorf("'delete' takes at most a single argument, that is the name of the environment")
+		}
+
 		flags := cmd.Flags()
 		var err error
 

cmd/diff.go

@@ -16,6 +16,7 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -36,6 +37,10 @@ var diffCmd = &cobra.Command{
 	Use:   "diff [env-name] [-f <file-or-dir>]",
 	Short: "Display differences between server and local config",
 	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) > 1 {
+			return fmt.Errorf("'diff' takes at most a single argument, that is the name of the environment")
+		}
+
 		flags := cmd.Flags()
 		var err error
 

cmd/root.go

@@ -370,7 +370,6 @@ func expandEnvCmdObjs(cmd *cobra.Command, envSpec *envSpec, cwd metadata.AbsPath
 				return nil, err
 			}
 		}
-
 	}
 
 	//

cmd/show.go

@@ -16,6 +16,7 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -38,6 +39,10 @@ var showCmd = &cobra.Command{
 	Use:   "show [<env>|-f <file-or-dir>]",
 	Short: "Show expanded resource definitions",
 	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) > 1 {
+			return fmt.Errorf("'show' takes at most a single argument, that is the name of the environment")
+		}
+
 		flags := cmd.Flags()
 		var err error
 

cmd/update.go

@@ -16,6 +16,7 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -41,6 +42,10 @@ var updateCmd = &cobra.Command{
 	Short: `[DEPRECATED] Update (or optionally create) Kubernetes resources on the cluster using the
 local configuration. Accepts JSON, YAML, or Jsonnet.`,
 	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) > 1 {
+			return fmt.Errorf("'update' takes at most a single argument, that is the name of the environment")
+		}
+
 		flags := cmd.Flags()
 		var err error
 

cmd/validate.go

@@ -16,6 +16,7 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -33,6 +34,10 @@ var validateCmd = &cobra.Command{
 	Use:   "validate [env-name] [-f <file-or-dir>]",
 	Short: "Compare generated manifest against server OpenAPI spec",
 	RunE: func(cmd *cobra.Command, args []string) error {
+		if len(args) > 1 {
+			return fmt.Errorf("'validate' takes at most a single argument, that is the name of the environment")
+		}
+
 		var err error
 
 		c := kubecfg.ValidateCmd{}