Loader FS and empty env fix

api/krusty/kustomizer.go

@@ -66,7 +66,8 @@ func (b *Kustomizer) Run(
 		ldr,
 		b.depProvider.GetFieldValidator(),
 		resmapFactory,
-		pLdr.NewLoader(b.options.PluginConfig, resmapFactory),
+		// The plugin configs are always located on disk, regardless of the fSys passed in
+		pLdr.NewLoader(b.options.PluginConfig, resmapFactory, filesys.MakeFsOnDisk()),
 	)
 	err = kt.Load()
 	if err != nil {

api/krusty/options.go

@@ -5,7 +5,6 @@ package krusty
 
 import (
 	"sigs.k8s.io/kustomize/api/internal/plugins/builtinhelpers"
-	"sigs.k8s.io/kustomize/api/konfig"
 	"sigs.k8s.io/kustomize/api/types"
 )
 
@@ -42,7 +41,7 @@ func MakeDefaultOptions() *Options {
 		AddManagedbyLabel:    false,
 		LoadRestrictions:     types.LoadRestrictionsRootOnly,
 		DoPrune:              false,
-		PluginConfig:         konfig.DisabledPluginConfig(),
+		PluginConfig:         types.DisabledPluginConfig(),
 	}
 }