Fix inconsistent validation of -f or -k flag in kubectl create command

Author: brianpursley

staging/src/k8s.io/kubectl/pkg/cmd/create/create.go

@@ -109,12 +109,6 @@ func NewCmdCreate(f cmdutil.Factory, ioStreams genericiooptions.IOStreams) *cobr
 		Long:                  createLong,
 		Example:               createExample,
 		Run: func(cmd *cobra.Command, args []string) {
-			if cmdutil.IsFilenameSliceEmpty(o.FilenameOptions.Filenames, o.FilenameOptions.Kustomize) {
-				ioStreams.ErrOut.Write([]byte("Error: must specify one of -f and -k\n\n"))
-				defaultRunFunc := cmdutil.DefaultSubCommandRun(ioStreams.ErrOut)
-				defaultRunFunc(cmd, args)
-				return
-			}
 			cmdutil.CheckErr(o.Complete(f, cmd, args))
 			cmdutil.CheckErr(o.Validate())
 			cmdutil.CheckErr(o.RunCreate(f, cmd))
@@ -159,8 +153,12 @@ func NewCmdCreate(f cmdutil.Factory, ioStreams genericiooptions.IOStreams) *cobr
 	return cmd
 }
 
-// Validate makes sure there is no discrepency in command options
+// Validate makes sure there is no discrepancy in command options
 func (o *CreateOptions) Validate() error {
+	if err := o.FilenameOptions.RequireFilenameOrKustomize(); err != nil {
+		return err
+	}
+
 	if len(o.Raw) > 0 {
 		if o.EditBeforeCreate {
 			return fmt.Errorf("--raw and --edit are mutually exclusive")

staging/src/k8s.io/kubectl/pkg/cmd/create/create_test.go

@@ -25,6 +25,7 @@ import (
 	"k8s.io/cli-runtime/pkg/resource"
 	"k8s.io/client-go/rest/fake"
 	cmdtesting "k8s.io/kubectl/pkg/cmd/testing"
+	cmdutil "k8s.io/kubectl/pkg/cmd/util"
 	"k8s.io/kubectl/pkg/scheme"
 )
 
@@ -150,3 +151,35 @@ func TestCreateDirectory(t *testing.T) {
 		t.Errorf("unexpected output: %s", buf.String())
 	}
 }
+
+func TestMissingFilenameError(t *testing.T) {
+	var errStr string
+	var exitCode int
+	cmdutil.BehaviorOnFatal(func(str string, code int) {
+		if errStr == "" {
+			errStr = str
+			exitCode = code
+		}
+	})
+
+	tf := cmdtesting.NewTestFactory().WithNamespace("test")
+	defer tf.Cleanup()
+
+	ioStreams, _, buf, _ := genericiooptions.NewTestIOStreams()
+	cmd := NewCmdCreate(tf, ioStreams)
+	cmd.Run(cmd, []string{})
+
+	if buf.Len() > 0 {
+		t.Errorf("unexpected output: %s", buf.String())
+	}
+
+	if len(errStr) == 0 {
+		t.Errorf("unexpected non-error")
+	} else if errStr != "error: must specify one of -f and -k" {
+		t.Errorf("unexpected error: %s", errStr)
+	}
+
+	if exitCode != 1 {
+		t.Errorf("unexpected exit code: %d", exitCode)
+	}
+}