Update containers/storage to pick up overlay driver fix

New pinned commit is ff8a6d2bf496daf46ab1a153f783a0f6b8762a54

This includes a fix to error reporting with overlayfs, and will
produce more verbose errors when initializing overlayfs fails.

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #546
Approved by: baude

vendor.conf

@@ -3,7 +3,7 @@ github.com/sirupsen/logrus v1.0.0
 github.com/containers/image b327f751c16e4a189fdcde4ea36be67cc964c605
 github.com/docker/docker-credential-helpers d68f9aeca33f5fd3f08eeae5e9d175edf4e731d1
 github.com/ostreedev/ostree-go master
-github.com/containers/storage 1e5ce40cdb84ab66e26186435b1273e04b879fef
+github.com/containers/storage ff8a6d2bf496daf46ab1a153f783a0f6b8762a54
 github.com/containernetworking/cni v0.4.0
 google.golang.org/grpc v1.0.4 https://github.com/grpc/grpc-go
 github.com/opencontainers/selinux b29023b86e4a69d1b46b7e7b4e2b6fda03f0b9cd

vendor/github.com/containers/storage/containers.go

@@ -106,10 +106,25 @@ type containerStore struct {
 	byname     map[string]*Container
 }
 
+func copyContainer(c *Container) *Container {
+	return &Container{
+		ID:             c.ID,
+		Names:          copyStringSlice(c.Names),
+		ImageID:        c.ImageID,
+		LayerID:        c.LayerID,
+		Metadata:       c.Metadata,
+		BigDataNames:   copyStringSlice(c.BigDataNames),
+		BigDataSizes:   copyStringInt64Map(c.BigDataSizes),
+		BigDataDigests: copyStringDigestMap(c.BigDataDigests),
+		Created:        c.Created,
+		Flags:          copyStringInterfaceMap(c.Flags),
+	}
+}
+
 func (r *containerStore) Containers() ([]Container, error) {
 	containers := make([]Container, len(r.containers))
 	for i := range r.containers {
-		containers[i] = *(r.containers[i])
+		containers[i] = *copyContainer(r.containers[i])
 	}
 	return containers, nil
 }
@@ -277,7 +292,7 @@ func (r *containerStore) Create(id string, names []string, image, layer, metadat
 		}
 		err = r.Save()
 	}
-	return container, err
+	return copyContainer(container), err
 }
 
 func (r *containerStore) Metadata(id string) (string, error) {
@@ -355,7 +370,7 @@ func (r *containerStore) Delete(id string) error {
 
 func (r *containerStore) Get(id string) (*Container, error) {
 	if container, ok := r.lookup(id); ok {
-		return container, nil
+		return copyContainer(container), nil
 	}
 	return nil, ErrContainerUnknown
 }
@@ -444,7 +459,7 @@ func (r *containerStore) BigDataNames(id string) ([]string, error) {
 	if !ok {
 		return nil, ErrContainerUnknown
 	}
-	return c.BigDataNames, nil
+	return copyStringSlice(c.BigDataNames), nil
 }
 
 func (r *containerStore) SetBigData(id, key string, data []byte) error {

vendor/github.com/containers/storage/containers_ffjson.go

@@ -1,5 +1,5 @@
 // Code generated by ffjson <https://github.com/pquerna/ffjson>. DO NOT EDIT.
-// source: containers.go
+// source: ./containers.go
 
 package storage
 

vendor/github.com/containers/storage/drivers/overlay/overlay.go

@@ -114,8 +114,8 @@ func init() {
 }
 
 // Init returns the a native diff driver for overlay filesystem.
-// If overlay filesystem is not supported on the host, graphdriver.ErrNotSupported is returned as error.
+// If overlay filesystem is not supported on the host, a wrapped graphdriver.ErrNotSupported is returned as error.
-// If an overlay filesystem is not supported over an existing filesystem then error graphdriver.ErrIncompatibleFS is returned.
+// If an overlay filesystem is not supported over an existing filesystem then a wrapped graphdriver.ErrIncompatibleFS is returned.
 func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (graphdriver.Driver, error) {
 	opts, err := parseOptions(options)
 	if err != nil {
@@ -151,7 +151,7 @@ func Init(home string, options []string, uidMaps, gidMaps []idtools.IDMap) (grap
 	if err != nil {
 		os.Remove(filepath.Join(home, linkDir))
 		os.Remove(home)
-		return nil, errors.Wrap(graphdriver.ErrNotSupported, "kernel does not support overlay fs")
+		return nil, errors.Wrap(err, "kernel does not support overlay fs")
 	}
 
 	if err := mount.MakePrivate(home); err != nil {
@@ -740,6 +740,11 @@ func (d *Driver) Diff(id, parent, mountLabel string) (io.ReadCloser, error) {
 		return d.naiveDiff.Diff(id, parent, mountLabel)
 	}
 
+	lowerDirs, err := d.getLowerDirs(id)
+	if err != nil {
+		return nil, err
+	}
+
 	diffPath := d.getDiffPath(id)
 	logrus.Debugf("Tar with options on %s", diffPath)
 	return archive.TarWithOptions(diffPath, &archive.TarOptions{
@@ -747,6 +752,7 @@ func (d *Driver) Diff(id, parent, mountLabel string) (io.ReadCloser, error) {
 		UIDMaps:        d.uidMaps,
 		GIDMaps:        d.gidMaps,
 		WhiteoutFormat: archive.OverlayWhiteoutFormat,
+		WhiteoutData:   lowerDirs,
 	})
 }
 

vendor/github.com/containers/storage/drivers/overlayutils/overlayutils.go

@@ -3,8 +3,10 @@
 package overlayutils
 
 import (
-	"errors"
 	"fmt"
+
+	"github.com/containers/storage/drivers"
+	"github.com/pkg/errors"
 )
 
 // ErrDTypeNotSupported denotes that the backing filesystem doesn't support d_type.
@@ -14,5 +16,5 @@ func ErrDTypeNotSupported(driver, backingFs string) error {
 		msg += " Reformat the filesystem with ftype=1 to enable d_type support."
 	}
 	msg += " Running without d_type is not supported."
-	return errors.New(msg)
+	return errors.Wrap(graphdriver.ErrNotSupported, msg)
 }

vendor/github.com/containers/storage/images.go

@@ -124,10 +124,25 @@ type imageStore struct {
 	bydigest map[digest.Digest][]*Image
 }
 
+func copyImage(i *Image) *Image {
+	return &Image{
+		ID:             i.ID,
+		Digest:         i.Digest,
+		Names:          copyStringSlice(i.Names),
+		TopLayer:       i.TopLayer,
+		Metadata:       i.Metadata,
+		BigDataNames:   copyStringSlice(i.BigDataNames),
+		BigDataSizes:   copyStringInt64Map(i.BigDataSizes),
+		BigDataDigests: copyStringDigestMap(i.BigDataDigests),
+		Created:        i.Created,
+		Flags:          copyStringInterfaceMap(i.Flags),
+	}
+}
+
 func (r *imageStore) Images() ([]Image, error) {
 	images := make([]Image, len(r.images))
 	for i := range r.images {
-		images[i] = *(r.images[i])
+		images[i] = *copyImage(r.images[i])
 	}
 	return images, nil
 }
@@ -343,7 +358,7 @@ func (r *imageStore) Create(id string, names []string, layer, metadata string, c
 		}
 		err = r.Save()
 	}
-	return image, err
+	return copyImage(image), err
 }
 
 func (r *imageStore) Metadata(id string) (string, error) {
@@ -450,7 +465,7 @@ func (r *imageStore) Delete(id string) error {
 
 func (r *imageStore) Get(id string) (*Image, error) {
 	if image, ok := r.lookup(id); ok {
-		return image, nil
+		return copyImage(image), nil
 	}
 	return nil, ErrImageUnknown
 }
@@ -546,7 +561,7 @@ func (r *imageStore) BigDataNames(id string) ([]string, error) {
 	if !ok {
 		return nil, ErrImageUnknown
 	}
-	return image.BigDataNames, nil
+	return copyStringSlice(image.BigDataNames), nil
 }
 
 func imageSliceWithoutValue(slice []*Image, value *Image) []*Image {

vendor/github.com/containers/storage/images_ffjson.go

@@ -1,5 +1,5 @@
 // Code generated by ffjson <https://github.com/pquerna/ffjson>. DO NOT EDIT.
-// source: images.go
+// source: ./images.go
 
 package storage
 

vendor/github.com/containers/storage/layers.go

@@ -223,10 +223,29 @@ type layerStore struct {
 	byuncompressedsum map[digest.Digest][]string
 }
 
+func copyLayer(l *Layer) *Layer {
+	return &Layer{
+		ID:                 l.ID,
+		Names:              copyStringSlice(l.Names),
+		Parent:             l.Parent,
+		Metadata:           l.Metadata,
+		MountLabel:         l.MountLabel,
+		MountPoint:         l.MountPoint,
+		MountCount:         l.MountCount,
+		Created:            l.Created,
+		CompressedDigest:   l.CompressedDigest,
+		CompressedSize:     l.CompressedSize,
+		UncompressedDigest: l.UncompressedDigest,
+		UncompressedSize:   l.UncompressedSize,
+		CompressionType:    l.CompressionType,
+		Flags:              copyStringInterfaceMap(l.Flags),
+	}
+}
+
 func (r *layerStore) Layers() ([]Layer, error) {
 	layers := make([]Layer, len(r.layers))
 	for i := range r.layers {
-		layers[i] = *(r.layers[i])
+		layers[i] = *copyLayer(r.layers[i])
 	}
 	return layers, nil
 }
@@ -558,7 +577,7 @@ func (r *layerStore) Put(id, parent string, names []string, mountLabel string, o
 			return nil, -1, err
 		}
 	}
-	return layer, size, err
+	return copyLayer(layer), size, err
 }
 
 func (r *layerStore) CreateWithFlags(id, parent string, names []string, mountLabel string, options map[string]string, writeable bool, flags map[string]interface{}) (layer *Layer, err error) {
@@ -731,7 +750,7 @@ func (r *layerStore) Exists(id string) bool {
 
 func (r *layerStore) Get(id string) (*Layer, error) {
 	if layer, ok := r.lookup(id); ok {
-		return layer, nil
+		return copyLayer(layer), nil
 	}
 	return nil, ErrLayerUnknown
 }
@@ -1003,7 +1022,7 @@ func (r *layerStore) layersByDigestMap(m map[digest.Digest][]string, d digest.Di
 		if !ok {
 			return nil, ErrLayerUnknown
 		}
-		layers = append(layers, *layer)
+		layers = append(layers, *copyLayer(layer))
 	}
 	return layers, nil
 }

vendor/github.com/containers/storage/layers_ffjson.go

@@ -1,5 +1,5 @@
 // Code generated by ffjson <https://github.com/pquerna/ffjson>. DO NOT EDIT.
-// source: layers.go.  Hack to make this work on github.com
+// source: ./layers.go
 
 package storage
 

vendor/github.com/containers/storage/pkg/archive/archive.go

@@ -45,6 +45,10 @@ type (
 		// This format will be converted to the standard format on pack
 		// and from the standard format on unpack.
 		WhiteoutFormat WhiteoutFormat
+		// This is additional data to be used by the converter.  It will
+		// not survive a round trip through JSON, so it's primarily
+		// intended for generating archives (i.e., converting writes).
+		WhiteoutData interface{}
 		// When unpacking, specifies whether overwriting a directory with a
 		// non-directory is allowed and vice versa.
 		NoOverwriteDirNonDir bool
@@ -702,7 +706,7 @@ func TarWithOptions(srcPath string, options *TarOptions) (io.ReadCloser, error)
 			compressWriter,
 			options.ChownOpts,
 		)
-		ta.WhiteoutConverter = getWhiteoutConverter(options.WhiteoutFormat)
+		ta.WhiteoutConverter = getWhiteoutConverter(options.WhiteoutFormat, options.WhiteoutData)
 
 		defer func() {
 			// Make sure to check the error on Close.
@@ -860,7 +864,7 @@ func Unpack(decompressedArchive io.Reader, dest string, options *TarOptions) err
 	var dirs []*tar.Header
 	idMappings := idtools.NewIDMappingsFromMaps(options.UIDMaps, options.GIDMaps)
 	rootIDs := idMappings.RootPair()
-	whiteoutConverter := getWhiteoutConverter(options.WhiteoutFormat)
+	whiteoutConverter := getWhiteoutConverter(options.WhiteoutFormat, options.WhiteoutData)
 
 	// Iterate through the files in the archive.
 loop:

vendor/github.com/containers/storage/pkg/archive/archive_linux.go

@@ -5,21 +5,27 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"syscall"
 
 	"github.com/containers/storage/pkg/system"
 	"golang.org/x/sys/unix"
 )
 
-func getWhiteoutConverter(format WhiteoutFormat) tarWhiteoutConverter {
+func getWhiteoutConverter(format WhiteoutFormat, data interface{}) tarWhiteoutConverter {
 	if format == OverlayWhiteoutFormat {
-		return overlayWhiteoutConverter{}
+		if rolayers, ok := data.([]string); ok && len(rolayers) > 0 {
+			return overlayWhiteoutConverter{rolayers: rolayers}
+		}
+		return overlayWhiteoutConverter{rolayers: nil}
 	}
 	return nil
 }
 
-type overlayWhiteoutConverter struct{}
+type overlayWhiteoutConverter struct {
+	rolayers []string
+}
 
-func (overlayWhiteoutConverter) ConvertWrite(hdr *tar.Header, path string, fi os.FileInfo) (wo *tar.Header, err error) {
+func (o overlayWhiteoutConverter) ConvertWrite(hdr *tar.Header, path string, fi os.FileInfo) (wo *tar.Header, err error) {
 	// convert whiteouts to AUFS format
 	if fi.Mode()&os.ModeCharDevice != 0 && hdr.Devmajor == 0 && hdr.Devminor == 0 {
 		// we just rename the file and make it normal
@@ -31,7 +37,7 @@ func (overlayWhiteoutConverter) ConvertWrite(hdr *tar.Header, path string, fi os
 	}
 
 	if fi.Mode()&os.ModeDir != 0 {
-		// convert opaque dirs to AUFS format by writing an empty file with the prefix
+		// convert opaque dirs to AUFS format by writing an empty file with the whiteout prefix
 		opaque, err := system.Lgetxattr(path, "trusted.overlay.opaque")
 		if err != nil {
 			return nil, err
@@ -40,7 +46,29 @@ func (overlayWhiteoutConverter) ConvertWrite(hdr *tar.Header, path string, fi os
 			if hdr.Xattrs != nil {
 				delete(hdr.Xattrs, "trusted.overlay.opaque")
 			}
-
+			// If there are no lower layers, then it can't have been deleted in this layer.
+			if len(o.rolayers) == 0 {
+				return nil, nil
+			}
+			// At this point, we have a directory that's opaque.  If it appears in one of the lower
+			// layers, then it was newly-created here, so it wasn't also deleted here.
+			for _, rolayer := range o.rolayers {
+				stat, statErr := os.Stat(filepath.Join(rolayer, hdr.Name))
+				if statErr != nil && !os.IsNotExist(statErr) && !isENOTDIR(statErr) {
+					// Not sure what happened here.
+					return nil, statErr
+				}
+				if statErr == nil {
+					if stat.Mode()&os.ModeCharDevice != 0 {
+						// It's a whiteout for this directory, so it can't have been
+						// both deleted and recreated in the layer we're diffing.
+						s := stat.Sys().(*syscall.Stat_t)
+						if major(s.Rdev) == 0 && minor(s.Rdev) == 0 {
+							return nil, nil
+						}
+					}
+					// It's not whiteout, so it was there in the older layer, so we need to
+					// add a whiteout for this item in this layer.
 					// create a header for the whiteout file
 					// it should inherit some properties from the parent, but be a regular file
 					wo = &tar.Header{
@@ -55,6 +83,28 @@ func (overlayWhiteoutConverter) ConvertWrite(hdr *tar.Header, path string, fi os
 						AccessTime: hdr.AccessTime,
 						ChangeTime: hdr.ChangeTime,
 					}
+					break
+				}
+				for dir := filepath.Dir(hdr.Name); dir != "" && dir != "." && dir != string(os.PathSeparator); dir = filepath.Dir(dir) {
+					// Check for whiteout for a parent directory in a parent layer.
+					stat, statErr := os.Stat(filepath.Join(rolayer, dir))
+					if statErr != nil && !os.IsNotExist(statErr) && !isENOTDIR(statErr) {
+						// Not sure what happened here.
+						return nil, statErr
+					}
+					if statErr == nil {
+						if stat.Mode()&os.ModeCharDevice != 0 {
+							// If it's whiteout for a parent directory, then the
+							// original directory wasn't inherited into this layer,
+							// so we don't need to emit whiteout for it.
+							s := stat.Sys().(*syscall.Stat_t)
+							if major(s.Rdev) == 0 && minor(s.Rdev) == 0 {
+								return nil, nil
+							}
+						}
+					}
+				}
+			}
 		}
 	}
 

vendor/github.com/containers/storage/pkg/archive/archive_other.go

@@ -2,6 +2,6 @@
 
 package archive
 
-func getWhiteoutConverter(format WhiteoutFormat) tarWhiteoutConverter {
+func getWhiteoutConverter(format WhiteoutFormat, data interface{}) tarWhiteoutConverter {
 	return nil
 }

vendor/github.com/containers/storage/pkg/archive/changes.go

@@ -81,7 +81,7 @@ func sameFsTimeSpec(a, b syscall.Timespec) bool {
 // Changes walks the path rw and determines changes for the files in the path,
 // with respect to the parent layers
 func Changes(layers []string, rw string) ([]Change, error) {
-	return changes(layers, rw, aufsDeletedFile, aufsMetadataSkip)
+	return changes(layers, rw, aufsDeletedFile, aufsMetadataSkip, aufsWhiteoutPresent)
 }
 
 func aufsMetadataSkip(path string) (skip bool, err error) {
@@ -104,10 +104,35 @@ func aufsDeletedFile(root, path string, fi os.FileInfo) (string, error) {
 	return "", nil
 }
 
+func aufsWhiteoutPresent(root, path string) (bool, error) {
+	f := filepath.Join(filepath.Dir(path), WhiteoutPrefix+filepath.Base(path))
+	_, err := os.Stat(filepath.Join(root, f))
+	if err == nil {
+		return true, nil
+	}
+	if os.IsNotExist(err) || isENOTDIR(err) {
+		return false, nil
+	}
+	return false, err
+}
+
+func isENOTDIR(err error) bool {
+	if err == nil {
+		return false
+	}
+	if perror, ok := err.(*os.PathError); ok {
+		if errno, ok := perror.Err.(syscall.Errno); ok {
+			return errno == syscall.ENOTDIR
+		}
+	}
+	return false
+}
+
 type skipChange func(string) (bool, error)
 type deleteChange func(string, string, os.FileInfo) (string, error)
+type whiteoutChange func(string, string) (bool, error)
 
-func changes(layers []string, rw string, dc deleteChange, sc skipChange) ([]Change, error) {
+func changes(layers []string, rw string, dc deleteChange, sc skipChange, wc whiteoutChange) ([]Change, error) {
 	var (
 		changes     []Change
 		changedDirs = make(map[string]struct{})
@@ -156,7 +181,28 @@ func changes(layers []string, rw string, dc deleteChange, sc skipChange) ([]Chan
 			change.Kind = ChangeAdd
 
 			// ...Unless it already existed in a top layer, in which case, it's a modification
+		layerScan:
 			for _, layer := range layers {
+				if wc != nil {
+					// ...Unless a lower layer also had whiteout for this directory or one of its parents,
+					// in which case, it's new
+					ignore, err := wc(layer, path)
+					if err != nil {
+						return err
+					}
+					if ignore {
+						break layerScan
+					}
+					for dir := filepath.Dir(path); dir != "" && dir != string(os.PathSeparator); dir = filepath.Dir(dir) {
+						ignore, err = wc(layer, dir)
+						if err != nil {
+							return err
+						}
+						if ignore {
+							break layerScan
+						}
+					}
+				}
 				stat, err := os.Stat(filepath.Join(layer, path))
 				if err != nil && !os.IsNotExist(err) {
 					return err
@@ -187,10 +233,15 @@ func changes(layers []string, rw string, dc deleteChange, sc skipChange) ([]Chan
 		}
 		if change.Kind == ChangeAdd || change.Kind == ChangeDelete {
 			parent := filepath.Dir(path)
+			tail := []Change{}
+			for parent != "/" {
 				if _, ok := changedDirs[parent]; !ok && parent != "/" {
-				changes = append(changes, Change{Path: parent, Kind: ChangeModify})
+					tail = append([]Change{{Path: parent, Kind: ChangeModify}}, tail...)
 					changedDirs[parent] = struct{}{}
 				}
+				parent = filepath.Dir(parent)
+			}
+			changes = append(changes, tail...)
 		}
 
 		// Record change

vendor/github.com/containers/storage/pkg/archive/changes_linux.go

@@ -288,26 +288,96 @@ func clen(n []byte) int {
 // OverlayChanges walks the path rw and determines changes for the files in the path,
 // with respect to the parent layers
 func OverlayChanges(layers []string, rw string) ([]Change, error) {
-	return changes(layers, rw, overlayDeletedFile, nil)
+	dc := func(root, path string, fi os.FileInfo) (string, error) {
+		return overlayDeletedFile(layers, root, path, fi)
+	}
+	return changes(layers, rw, dc, nil, overlayLowerContainsWhiteout)
 }
 
-func overlayDeletedFile(root, path string, fi os.FileInfo) (string, error) {
+func overlayLowerContainsWhiteout(root, path string) (bool, error) {
+	// Whiteout for a file or directory has the same name, but is for a character
+	// device with major/minor of 0/0.
+	stat, err := os.Stat(filepath.Join(root, path))
+	if err != nil && !os.IsNotExist(err) && !isENOTDIR(err) {
+		// Not sure what happened here.
+		return false, err
+	}
+	if err == nil && stat.Mode()&os.ModeCharDevice != 0 {
+		// Check if there's whiteout for the specified item in the specified layer.
+		s := stat.Sys().(*syscall.Stat_t)
+		if major(s.Rdev) == 0 && minor(s.Rdev) == 0 {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
+func overlayDeletedFile(layers []string, root, path string, fi os.FileInfo) (string, error) {
+	// If it's a whiteout item, then a file or directory with that name is removed by this layer.
 	if fi.Mode()&os.ModeCharDevice != 0 {
 		s := fi.Sys().(*syscall.Stat_t)
 		if major(s.Rdev) == 0 && minor(s.Rdev) == 0 {
 			return path, nil
 		}
 	}
-	if fi.Mode()&os.ModeDir != 0 {
+	// After this we only need to pay attention to directories.
+	if !fi.IsDir() {
+		return "", nil
+	}
+	// If the directory isn't marked as opaque, then it's just a normal directory.
 	opaque, err := system.Lgetxattr(filepath.Join(root, path), "trusted.overlay.opaque")
 	if err != nil {
 		return "", err
 	}
-		if len(opaque) == 1 && opaque[0] == 'y' {
+	if len(opaque) != 1 || opaque[0] != 'y' {
+		return "", err
+	}
+	// If there are no lower layers, then it can't have been deleted and recreated in this layer.
+	if len(layers) == 0 {
+		return "", err
+	}
+	// At this point, we have a directory that's opaque.  If it appears in one of the lower
+	// layers, then it was newly-created here, so it wasn't also deleted here.
+	for _, layer := range layers {
+		stat, err := os.Stat(filepath.Join(layer, path))
+		if err != nil && !os.IsNotExist(err) && !isENOTDIR(err) {
+			// Not sure what happened here.
+			return "", err
+		}
+		if err == nil {
+			if stat.Mode()&os.ModeCharDevice != 0 {
+				// It's a whiteout for this directory, so it can't have been
+				// deleted in this layer.
+				s := stat.Sys().(*syscall.Stat_t)
+				if major(s.Rdev) == 0 && minor(s.Rdev) == 0 {
+					return "", nil
+				}
+			}
+			// It's not whiteout, so it was there in the older layer, so it has to be
+			// marked as deleted in this layer.
 			return path, nil
 		}
+		for dir := filepath.Dir(path); dir != "" && dir != string(os.PathSeparator); dir = filepath.Dir(dir) {
+			// Check for whiteout for a parent directory.
+			stat, err := os.Stat(filepath.Join(layer, dir))
+			if err != nil && !os.IsNotExist(err) && !isENOTDIR(err) {
+				// Not sure what happened here.
+				return "", err
+			}
+			if err == nil {
+				if stat.Mode()&os.ModeCharDevice != 0 {
+					// If it's whiteout for a parent directory, then the
+					// original directory wasn't inherited into the top layer.
+					s := stat.Sys().(*syscall.Stat_t)
+					if major(s.Rdev) == 0 && minor(s.Rdev) == 0 {
+						return "", nil
+					}
+				}
+			}
+		}
 	}
 
+	// We didn't find the same path in any older layers, so it was new in this one.
 	return "", nil
 
 }

vendor/github.com/containers/storage/store.go

@@ -2350,6 +2350,41 @@ func stringSliceWithoutValue(slice []string, value string) []string {
 	return modified
 }
 
+func copyStringSlice(slice []string) []string {
+	if len(slice) == 0 {
+		return nil
+	}
+	ret := make([]string, len(slice))
+	copy(ret, slice)
+	return ret
+}
+
+func copyStringInt64Map(m map[string]int64) map[string]int64 {
+	ret := make(map[string]int64, len(m))
+	for k, v := range m {
+		ret[k] = v
+	}
+	return ret
+}
+
+func copyStringDigestMap(m map[string]digest.Digest) map[string]digest.Digest {
+	ret := make(map[string]digest.Digest, len(m))
+	for k, v := range m {
+		ret[k] = v
+	}
+	return ret
+}
+
+// copyStringInterfaceMap still forces us to assume that the interface{} is
+// a non-pointer scalar value
+func copyStringInterfaceMap(m map[string]interface{}) map[string]interface{} {
+	ret := make(map[string]interface{}, len(m))
+	for k, v := range m {
+		ret[k] = v
+	}
+	return ret
+}
+
 const configFile = "/etc/containers/storage.conf"
 
 // OptionsConfig represents the "storage.options" TOML config table.