Add build --load-restrictor completion

Signed-off-by: Sylvain Rabot <sylvain@abstraction.fr>

kustomize/commands/build/build.go

@@ -105,9 +105,11 @@ func NewCmdBuild(
 	AddFlagOutputPath(cmd.Flags())
 	AddFunctionBasicsFlags(cmd.Flags())
 	AddFlagLoadRestrictor(cmd.Flags())
+	AddFlagLoadRestrictorCompletion(cmd)
 	AddFlagEnablePlugins(cmd.Flags())
 	AddFlagReorderOutput(cmd.Flags())
 	AddFlagEnableManagedbyLabel(cmd.Flags())
+
 	msg := "Error marking flag '%s' as deprecated: %v"
 	err := cmd.Flags().MarkDeprecated(flagReorderOutputName,
 		"use the new 'sortOptions' field in kustomization.yaml instead.")

kustomize/commands/build/flagloadrestrictor.go

@@ -6,6 +6,7 @@ package build
 import (
 	"fmt"
 
+	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
 	"sigs.k8s.io/kustomize/api/types"
 )
@@ -23,6 +24,15 @@ func AddFlagLoadRestrictor(set *pflag.FlagSet) {
 			"relocatability of the kustomization.")
 }
 
+func AddFlagLoadRestrictorCompletion(cmd *cobra.Command) {
+	cmd.RegisterFlagCompletionFunc(flagLoadRestrictorName, func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+		return []string{
+			types.LoadRestrictionsNone.String(),
+			types.LoadRestrictionsRootOnly.String(),
+		}, cobra.ShellCompDirectiveNoFileComp
+	})
+}
+
 func validateFlagLoadRestrictor() error {
 	switch theFlags.loadRestrictor {
 	case types.LoadRestrictionsRootOnly.String(),