Made generators work in addition to transformers

Made go fmt to make linter happy

api/internal/plugins/fnplugin/fnplugin.go

@@ -6,7 +6,7 @@ package fnplugin
 import (
 	"bytes"
 	"fmt"
-	"log"
+	//"log"
 	"strconv"
 
 	"github.com/pkg/errors"
@@ -17,11 +17,11 @@ import (
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/yaml"
 
-	kyaml "sigs.k8s.io/kustomize/kyaml/yaml"
 	"sigs.k8s.io/kustomize/kyaml/kio"
+	kyaml "sigs.k8s.io/kustomize/kyaml/yaml"
 
-	"sigs.k8s.io/kustomize/kyaml/runfn"
 	"sigs.k8s.io/kustomize/kyaml/fn/runtime/runtimeutil"
+	"sigs.k8s.io/kustomize/kyaml/runfn"
 )
 
 const (
@@ -32,7 +32,7 @@ const (
 
 type FnPlugin struct {
 	// Function runner
-	RunFns runfn.RunFns
+	runFns runfn.RunFns
 
 	// Plugin configuration data.
 	cfg []byte
@@ -81,9 +81,9 @@ func toStorageMounts(mounts []string) []runtimeutil.StorageMount {
 }
 
 func NewFnPlugin(o *types.FnPluginLoadingOptions) *FnPlugin {
-	log.Printf("options: %v\n", o)
+	//log.Printf("options: %v\n", o)
 	return &FnPlugin{
-		RunFns: runfn.RunFns{
+		runFns: runfn.RunFns{
 			Functions:      []*kyaml.RNode{},
 			Network:        o.Network,
 			NetworkName:    o.NetworkName,
@@ -101,14 +101,6 @@ func (p *FnPlugin) Cfg() []byte {
 func (p *FnPlugin) Config(h *resmap.PluginHelpers, config []byte) error {
 	p.h = h
 	p.cfg = config
-
-	rnode, err := bytesToRNode(config)
-	if err != nil {
-		return err
-	}
-
-	p.RunFns.Functions = append(p.RunFns.Functions, rnode)
-
 	return nil
 }
 
@@ -149,30 +141,50 @@ func (p *FnPlugin) Transform(rm resmap.ResMap) error {
 
 // invokePlugin uses Function runner to run function as plugin
 func (p *FnPlugin) invokePlugin(input []byte) ([]byte, error) {
+	// get config rnode
+	rnode, err := bytesToRNode(p.cfg)
+	if err != nil {
+		return nil, err
+	}
+	err = rnode.PipeE(kyaml.SetAnnotation("config.kubernetes.io/local-config", "true"))
+	if err != nil {
+		return nil, err
+	}
+
+	// we need to add config as input for generators. Some of them don't work with FunctionConfig
+	// and in addition kio.Pipeline won't create anything if there are no objects
+	// see https://github.com/kubernetes-sigs/kustomize/blob/master/kyaml/kio/kio.go#L93
+	if input == nil {
+		yaml, err := rnode.String()
+		if err != nil {
+			return nil, err
+		}
+		input = []byte(yaml)
+	}
+
 	// Transform to ResourceList
 	var inOut bytes.Buffer
 	inIn := bytes.NewReader(input)
-
+	err = kio.Pipeline{
-	err := kio.Pipeline{
 		Inputs: []kio.Reader{&kio.ByteReader{Reader: inIn}},
 		Outputs: []kio.Writer{kio.ByteWriter{
 			Writer:             &inOut,
 			WrappingKind:       kio.ResourceListKind,
-			WrappingAPIVersion: kio.ResourceListAPIVersion,}},
+			WrappingAPIVersion: kio.ResourceListAPIVersion}},
 	}.Execute()
 	if err != nil {
 		return nil, errors.Wrap(
 			err, "couldn't transform to ResourceList")
 	}
-
 	//log.Printf("converted to:\n%s\n", inOut.String())
 
-	// Execute Fn (it's configured - see Config())
+	// Configure and Execute Fn
 	var runFnsOut bytes.Buffer
-	p.RunFns.Input = bytes.NewReader(inOut.Bytes())
+	p.runFns.Input = bytes.NewReader(inOut.Bytes())
-	p.RunFns.Output = &runFnsOut
+	p.runFns.Functions = append(p.runFns.Functions, rnode)
+	p.runFns.Output = &runFnsOut
 
-	err = p.RunFns.Execute()
+	err = p.runFns.Execute()
 	if err != nil {
 		return nil, errors.Wrap(
 			err, "couln't execute function")

api/types/pluginconfig.go

@@ -30,6 +30,6 @@ type PluginConfig struct {
 	// BpLoadingOptions distinguishes builtin plugin behaviors.
 	BpLoadingOptions BuiltinPluginLoadingOptions
 
-	// FnpLoadingOpeions sets the way function-based plugin behaviors.
+	// FnpLoadingOptions sets the way function-based plugin behaviors.
 	FnpLoadingOptions FnPluginLoadingOptions
 }

kustomize/internal/commands/build/build.go

@@ -76,7 +76,7 @@ func NewCmdBuild(out io.Writer) *cobra.Command {
 		"output", "o", "",
 		"If specified, write the build output to this path.")
 	cmd.Flags().BoolVar(
-		&o.fnOptions.EnableExec, "enable-exec", false /*do not change!*/,
+		&o.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)")
 	cmd.Flags().BoolVar(
 		&o.fnOptions.EnableStar, "enable-star", false,