Add load_restrictor flag.

go.mod

@@ -25,7 +25,7 @@ require (
 	github.com/onsi/gomega v1.5.0 // indirect
 	github.com/pkg/errors v0.8.0
 	github.com/spf13/cobra v0.0.2
-	github.com/spf13/pflag v1.0.1 // indirect
+	github.com/spf13/pflag v1.0.1
 	github.com/stretchr/testify v1.3.0 // indirect
 	golang.org/x/net v0.0.0-20190225153610-fe579d43d832 // indirect
 	golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6 // indirect

pkg/commands/build/build.go

@@ -38,6 +38,7 @@ import (
 type Options struct {
 	kustomizationPath string
 	outputPath        string
+	loadRestrictor    loader.LoadRestrictorFunc
 }
 
 // NewOptions creates a Options object
@@ -45,6 +46,7 @@ func NewOptions(p, o string) *Options {
 	return &Options{
 		kustomizationPath: p,
 		outputPath:        o,
+		loadRestrictor:    loader.RestrictionRootOnly,
 	}
 }
 
@@ -88,13 +90,14 @@ func NewCmdBuild(
 		&o.outputPath,
 		"output", "o", "",
 		"If specified, write the build output to this path.")
+	loader.AddLoadRestrictionsFlag(cmd.Flags())
 
 	cmd.AddCommand(NewCmdBuildPrune(out, fs, rf, ptf, pc))
 	return cmd
 }
 
 // Validate validates build command.
-func (o *Options) Validate(args []string) error {
+func (o *Options) Validate(args []string) (err error) {
 	if len(args) > 1 {
 		return errors.New(
 			"specify one path to " + pgmconfig.KustomizationFileNames[0])
@@ -104,8 +107,8 @@ func (o *Options) Validate(args []string) error {
 	} else {
 		o.kustomizationPath = args[0]
 	}
-
+	o.loadRestrictor, err = loader.ValidateLoadRestrictorFlag()
-	return nil
+	return
 }
 
 // RunBuild runs build command.
@@ -113,7 +116,8 @@ func (o *Options) RunBuild(
 	out io.Writer, fSys fs.FileSystem,
 	rf *resmap.Factory, ptf transformer.Factory,
 	pc *types.PluginConfig) error {
-	ldr, err := loader.NewLoader(o.kustomizationPath, fSys)
+	ldr, err := loader.NewLoader(
+		o.loadRestrictor, o.kustomizationPath, fSys)
 	if err != nil {
 		return err
 	}
@@ -133,7 +137,8 @@ func (o *Options) RunBuildPrune(
 	out io.Writer, fSys fs.FileSystem,
 	rf *resmap.Factory, ptf transformer.Factory,
 	pc *types.PluginConfig) error {
-	ldr, err := loader.NewLoader(o.kustomizationPath, fSys)
+	ldr, err := loader.NewLoader(
+		o.loadRestrictor, o.kustomizationPath, fSys)
 	if err != nil {
 		return err
 	}

pkg/internal/loadertest/fakeloader.go

@@ -31,12 +31,22 @@ type FakeLoader struct {
 }
 
 // NewFakeLoader returns a Loader that uses a fake filesystem.
-// The argument should be an absolute file path.
+// The loader will be restricted to root only.
+// The initialDir argument should be an absolute file path.
 func NewFakeLoader(initialDir string) FakeLoader {
+	return NewFakeLoaderWithRestrictor(
+		loader.RestrictionRootOnly, initialDir)
+}
+
+// NewFakeLoaderWithRestrictor returns a Loader that
+// uses a fake filesystem.
+// The initialDir argument should be an absolute file path.
+func NewFakeLoaderWithRestrictor(
+	lr loader.LoadRestrictorFunc, initialDir string) FakeLoader {
 	// Create fake filesystem and inject it into initial Loader.
 	fSys := fs.MakeFakeFS()
 	fSys.Mkdir(initialDir)
-	ldr, err := loader.NewLoader(initialDir, fSys)
+	ldr, err := loader.NewLoader(lr, initialDir, fSys)
 	if err != nil {
 		log.Fatalf("Unable to make loader: %v", err)
 	}

pkg/loader/fileloader_test.go

@@ -288,7 +288,7 @@ func doSanityChecksAndDropIntoBase(
 	return l
 }
 
-func TestRestrictionRootInRealLoader(t *testing.T) {
+func TestRestrictionRootOnlyInRealLoader(t *testing.T) {
 	dir, fSys, err := commonSetupForLoaderRestrictionTest()
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)

pkg/loader/loader.go

@@ -26,10 +26,11 @@ import (
 // NewLoader returns a Loader pointed at the given target.
 // If the target is remote, the loader will be restricted
 // to the root and below only.  If the target is local, the
-// loader will have no restrictions.  If the local target
+// loader will have the restrictions passed in.  Regardless,
-// attempts to transitively load remote bases, they will all
+// if a local target attempts to transitively load remote bases,
-// be root-only restricted.
+// the remote bases will all be root-only restricted.
 func NewLoader(
+	lr LoadRestrictorFunc,
 	target string, fSys fs.FileSystem) (ifc.Loader, error) {
 	repoSpec, err := git.NewRepoSpecFromUrl(target)
 	if err == nil {
@@ -42,5 +43,5 @@ func NewLoader(
 		return nil, err
 	}
 	return newLoaderAtConfirmedDir(
-		RestrictionNone, root, fSys, nil, git.ClonerUsingGitExec), nil
+		lr, root, fSys, nil, git.ClonerUsingGitExec), nil
 }

pkg/loader/loadrestrictions.go

@@ -19,9 +19,50 @@ package loader
 import (
 	"fmt"
 
+	"github.com/spf13/pflag"
 	"sigs.k8s.io/kustomize/pkg/fs"
 )
 
+//go:generate stringer -type=loadRestrictions
+type loadRestrictions int
+
+const (
+	unknown loadRestrictions = iota
+	rootOnly
+	none
+)
+
+const (
+	flagName = "load_restrictor"
+)
+
+var (
+	flagValue = rootOnly.String()
+	flagHelp  = "if set to '" + none.String() +
+		"', local kustomizations may load files from outside their root. " +
+		"This does, however, break the relocatability of the kustomization."
+)
+
+func AddLoadRestrictionsFlag(set *pflag.FlagSet) {
+	set.StringVar(
+		&flagValue, flagName,
+		rootOnly.String(), flagHelp)
+}
+
+func ValidateLoadRestrictorFlag() (LoadRestrictorFunc, error) {
+	switch flagValue {
+	case rootOnly.String():
+		return RestrictionRootOnly, nil
+	case none.String():
+		return RestrictionNone, nil
+	default:
+		return nil, fmt.Errorf(
+			"illegal flag value --%s %s; legal values: %v",
+			flagName, flagValue,
+			[]string{rootOnly.String(), none.String()})
+	}
+}
+
 type LoadRestrictorFunc func(
 	fs.FileSystem, fs.ConfirmedDir, string) (string, error)
 

pkg/loader/loadrestrictions_string.go

@@ -0,0 +1,25 @@
+// Code generated by "stringer -type=loadRestrictions"; DO NOT EDIT.
+
+package loader
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[unknown-0]
+	_ = x[rootOnly-1]
+	_ = x[none-2]
+}
+
+const _loadRestrictions_name = "unknownrootOnlynone"
+
+var _loadRestrictions_index = [...]uint8{0, 7, 15, 19}
+
+func (i loadRestrictions) String() string {
+	if i < 0 || i >= loadRestrictions(len(_loadRestrictions_index)-1) {
+		return "loadRestrictions(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _loadRestrictions_name[_loadRestrictions_index[i]:_loadRestrictions_index[i+1]]
+}

pkg/target/baseandoverlaysmall_test.go

@@ -17,7 +17,11 @@ limitations under the License.
 package target_test
 
 import (
+	"strings"
 	"testing"
+
+	"sigs.k8s.io/kustomize/k8sdeps/kv/plugin"
+	"sigs.k8s.io/kustomize/pkg/loader"
 )
 
 func writeSmallBase(th *KustTestHarness) {
@@ -181,8 +185,42 @@ spec:
 `)
 }
 
+func TestSharedPatchDisAllowed(t *testing.T) {
+	th := NewKustTestHarnessFull(
+		t, "/app/overlay",
+		loader.RestrictionRootOnly, plugin.DefaultPluginConfig())
+	writeSmallBase(th)
+	th.writeK("/app/overlay", `
+commonLabels:
+  env: prod
+bases:
+- ../base
+patchesStrategicMerge:
+- ../shared/deployment-patch.yaml
+`)
+	th.writeF("/app/shared/deployment-patch.yaml", `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeployment
+spec:
+  replicas: 1000
+`)
+	_, err := th.makeKustTarget().MakeCustomizedResMap()
+	if err == nil {
+		t.Fatalf("expected error")
+	}
+	if !strings.Contains(
+		err.Error(),
+		"security; file '/app/shared/deployment-patch.yaml' is not in or below '/app/overlay'") {
+		t.Fatalf("unexpected error: %s", err)
+	}
+}
+
 func TestSharedPatchAllowed(t *testing.T) {
-	th := NewKustTestHarness(t, "/app/overlay")
+	th := NewKustTestHarnessFull(
+		t, "/app/overlay",
+		loader.RestrictionNone, plugin.DefaultPluginConfig())
 	writeSmallBase(th)
 	th.writeK("/app/overlay", `
 commonLabels:

pkg/target/kusttestharness_test.go

@@ -28,6 +28,7 @@ import (
 	"sigs.k8s.io/kustomize/k8sdeps/kv/plugin"
 	"sigs.k8s.io/kustomize/k8sdeps/transformer"
 	"sigs.k8s.io/kustomize/pkg/internal/loadertest"
+	"sigs.k8s.io/kustomize/pkg/loader"
 	"sigs.k8s.io/kustomize/pkg/pgmconfig"
 	"sigs.k8s.io/kustomize/pkg/resmap"
 	"sigs.k8s.io/kustomize/pkg/resource"
@@ -51,12 +52,18 @@ func NewKustTestHarness(t *testing.T, path string) *KustTestHarness {
 func NewKustTestHarnessWithPluginConfig(
 	t *testing.T, path string,
 	pc *types.PluginConfig) *KustTestHarness {
+	return NewKustTestHarnessFull(t, path, loader.RestrictionRootOnly, pc)
+}
+
+func NewKustTestHarnessFull(
+	t *testing.T, path string,
+	lr loader.LoadRestrictorFunc, pc *types.PluginConfig) *KustTestHarness {
 	return &KustTestHarness{
 		t: t,
 		rf: resmap.NewFactory(resource.NewFactory(
 			kunstruct.NewKunstructuredFactoryWithGeneratorArgs(
 				&types.GeneratorMetaArgs{PluginConfig: pc}))),
-		ldr: loadertest.NewFakeLoader(path),
+		ldr: loadertest.NewFakeLoaderWithRestrictor(lr, path),
 		pc:  pc}
 }