Extract flags that enable alpha function features.

kustomize/commands/build/build.go

@@ -98,20 +98,18 @@ func NewCmdBuild(
 			return err
 		},
 	}
-
 	AddFlagOutputPath(cmd.Flags())
-	AddFunctionFlags(cmd.Flags())
+	AddFunctionBasicsFlags(cmd.Flags())
 	AddFlagLoadRestrictor(cmd.Flags())
 	AddFlagEnablePlugins(cmd.Flags())
 	AddFlagReorderOutput(cmd.Flags())
 	AddFlagEnableManagedbyLabel(cmd.Flags())
 	AddFlagAllowResourceIdChanges(cmd.Flags())
-
 	return cmd
 }
 
 // Validate validates build command args and flags.
-func Validate(args []string) (err error) {
+func Validate(args []string) error {
 	if len(args) > 1 {
 		return fmt.Errorf(
 			"specify one path to " +
@@ -122,8 +120,7 @@ func Validate(args []string) (err error) {
 	} else {
 		theArgs.kustomizationPath = args[0]
 	}
-	err = validateFlagLoadRestrictor()
-	if err != nil {
+	if err := validateFlagLoadRestrictor(); err != nil {
 		return err
 	}
 	return validateFlagReorderOutput()

kustomize/commands/build/flagsforfunctions.go

@@ -7,13 +7,7 @@ import (
 	"github.com/spf13/pflag"
 )
 
-func AddFunctionFlags(set *pflag.FlagSet) {
-	set.BoolVar(
-		&theFlags.fnOptions.EnableExec, "enable-exec", false, /*do not change!*/
-		"enable support for exec functions -- note: exec functions run arbitrary code -- do not use for untrusted configs!!! (Alpha)")
-	set.BoolVar(
-		&theFlags.fnOptions.EnableStar, "enable-star", false,
-		"enable support for starlark functions. (Alpha)")
+func AddFunctionBasicsFlags(set *pflag.FlagSet) {
 	set.BoolVar(
 		&theFlags.fnOptions.Network, "network", false,
 		"enable network access for functions that declare it")
@@ -27,3 +21,13 @@ func AddFunctionFlags(set *pflag.FlagSet) {
 		&theFlags.fnOptions.Env, "env", "e", []string{},
 		"a list of environment variables to be used by functions")
 }
+
+func AddFunctionAlphaEnablementFlags(set *pflag.FlagSet) {
+	set.BoolVar(
+		&theFlags.fnOptions.EnableExec, "enable-exec", false,
+		"enable support for exec functions (raw executables); "+
+			"do not use for untrusted configs! (Alpha)")
+	set.BoolVar(
+		&theFlags.fnOptions.EnableStar, "enable-star", false,
+		"enable support for starlark functions. (Alpha)")
+}

kustomize/commands/commands.go

@@ -6,6 +6,7 @@ package commands
 
 import (
 	"flag"
+	"io"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -21,6 +22,14 @@ import (
 	"sigs.k8s.io/kustomize/kustomize/v4/commands/version"
 )
 
+func makeBuildCommand(fSys filesys.FileSystem, w io.Writer) *cobra.Command {
+	cmd := build.NewCmdBuild(
+		fSys, build.MakeHelp(konfig.ProgramName, "build"), w)
+	// Add build flags that don't appear in kubectl.
+	build.AddFunctionAlphaEnablementFlags(cmd.Flags())
+	return cmd
+}
+
 // NewDefaultCommand returns the default (aka root) command for kustomize command.
 func NewDefaultCommand() *cobra.Command {
 	fSys := filesys.MakeFsOnDisk()
@@ -34,11 +43,11 @@ Manages declarative configuration of Kubernetes.
 See https://sigs.k8s.io/kustomize
 `,
 	}
+
 	pvd := provider.NewDefaultDepProvider()
 	c.AddCommand(
 		completion.NewCommand(),
-		build.NewCmdBuild(
-			fSys, build.MakeHelp(konfig.ProgramName, "build"), stdOut),
+		makeBuildCommand(fSys, stdOut),
 		edit.NewCmdEdit(
 			fSys, pvd.GetFieldValidator(), pvd.GetKunstructuredFactory()),
 		create.NewCmdCreate(fSys, pvd.GetKunstructuredFactory()),