Update to Kustomize v4

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

pkg/manifestgen/install/manifests.go

@@ -26,9 +26,11 @@ import (
 	"path"
 	"path/filepath"
 	"strings"
+	"sync"
 
 	"sigs.k8s.io/kustomize/api/filesys"
 	"sigs.k8s.io/kustomize/api/krusty"
+	kustypes "sigs.k8s.io/kustomize/api/types"
 
 	"github.com/fluxcd/pkg/untar"
 )
@@ -113,7 +115,14 @@ func generate(base string, options Options) error {
 	return nil
 }
 
+var kustomizeBuildMutex sync.Mutex
+
 func build(base, output string) error {
+	// TODO(stefan): temporary workaround for concurrent map read and map write bug
+	// https://github.com/kubernetes-sigs/kustomize/issues/3659
+	kustomizeBuildMutex.Lock()
+	defer kustomizeBuildMutex.Unlock()
+
 	kfile := filepath.Join(base, "kustomization.yaml")
 
 	fs := filesys.MakeFsOnDisk()
@@ -137,10 +146,16 @@ func build(base, output string) error {
 		}
 	}
 
-	opt := krusty.MakeDefaultOptions()
-	opt.DoLegacyResourceSort = true
-	k := krusty.MakeKustomizer(fs, opt)
-	m, err := k.Run(base)
+	buildOptions := &krusty.Options{
+		DoLegacyResourceSort: true,
+		LoadRestrictions:     kustypes.LoadRestrictionsNone,
+		AddManagedbyLabel:    false,
+		DoPrune:              false,
+		PluginConfig:         kustypes.DisabledPluginConfig(),
+	}
+
+	k := krusty.MakeKustomizer(buildOptions)
+	m, err := k.Run(fs, base)
 	if err != nil {
 		return err
 	}

pkg/manifestgen/kustomization/kustomization.go

@@ -21,8 +21,8 @@ import (
 	"os"
 	"path/filepath"
 
-	"sigs.k8s.io/kustomize/api/k8sdeps/kunstruct"
 	"sigs.k8s.io/kustomize/api/konfig"
+	"sigs.k8s.io/kustomize/api/provider"
 	kustypes "sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/yaml"
 
@@ -35,7 +35,8 @@ func Generate(options Options) (*manifestgen.Manifest, error) {
 
 	scan := func(base string) ([]string, error) {
 		var paths []string
-		uf := kunstruct.NewKunstructuredFactoryImpl()
+		pvd := provider.NewDefaultDepProvider()
+		rf := pvd.GetResourceFactory()
 		err := options.FileSystem.Walk(base, func(path string, info os.FileInfo, err error) error {
 			if err != nil {
 				return err
@@ -58,7 +59,7 @@ func Generate(options Options) (*manifestgen.Manifest, error) {
 			if err != nil {
 				return err
 			}
-			if _, err := uf.SliceFromBytes(fContents); err != nil {
+			if _, err := rf.SliceFromBytes(fContents); err != nil {
 				return nil
 			}
 			paths = append(paths, path)