Use any instead of interface{}

It's available since Go 1.18 (see https://pkg.go.dev/builtin#any).

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

cmd/containers-storage/main.go

@@ -148,7 +148,7 @@ func main() {
 
 // outputJSON formats its input as JSON to stdout, and returns values suitable
 // for directly returning from command.action
-func outputJSON(data interface{}) (int, error) {
+func outputJSON(data any) (int, error) {
 	if err := json.NewEncoder(os.Stdout).Encode(data); err != nil {
 		return 1, err
 	}

containers.go

@@ -82,7 +82,7 @@ type Container struct {
 	UIDMap []idtools.IDMap `json:"uidmap,omitempty"`
 	GIDMap []idtools.IDMap `json:"gidmap,omitempty"`
 
-	Flags map[string]interface{} `json:"flags,omitempty"`
+	Flags map[string]any `json:"flags,omitempty"`
 
 	// volatileStore is true if the container is from the volatile json file
 	volatileStore bool `json:"-"`
@@ -196,7 +196,7 @@ func (c *Container) MountOpts() []string {
 	switch value := c.Flags[mountOptsFlag].(type) {
 	case []string:
 		return value
-	case []interface{}:
+	case []any:
 		var mountOpts []string
 		for _, v := range value {
 			if flag, ok := v.(string); ok {
@@ -641,13 +641,13 @@ func (r *containerStore) ClearFlag(id string, flag string) error {
 }
 
 // Requires startWriting.
-func (r *containerStore) SetFlag(id string, flag string, value interface{}) error {
+func (r *containerStore) SetFlag(id string, flag string, value any) error {
 	container, ok := r.lookup(id)
 	if !ok {
 		return ErrContainerUnknown
 	}
 	if container.Flags == nil {
-		container.Flags = make(map[string]interface{})
+		container.Flags = make(map[string]any)
 	}
 	container.Flags[flag] = value
 	return r.saveFor(container)

deprecated.go

@@ -111,7 +111,7 @@ type LayerBigDataStore interface {
 // Deprecated: There is no way to use this from any external user of c/storage to invoke c/storage functionality.
 type FlaggableStore interface {
 	ClearFlag(id string, flag string) error
-	SetFlag(id string, flag string, value interface{}) error
+	SetFlag(id string, flag string, value any) error
 }
 
 // ContainerStore is a deprecated interface with no documented way to use it from callers outside of c/storage.
@@ -195,8 +195,8 @@ type LayerStore interface {
 	FlaggableStore
 	RWLayerBigDataStore
 	Create(id string, parent *Layer, names []string, mountLabel string, options map[string]string, moreOptions *LayerOptions, writeable bool) (*Layer, error)
-	CreateWithFlags(id string, parent *Layer, names []string, mountLabel string, options map[string]string, moreOptions *LayerOptions, writeable bool, flags map[string]interface{}) (layer *Layer, err error)
-	Put(id string, parent *Layer, names []string, mountLabel string, options map[string]string, moreOptions *LayerOptions, writeable bool, flags map[string]interface{}, diff io.Reader) (*Layer, int64, error)
+	CreateWithFlags(id string, parent *Layer, names []string, mountLabel string, options map[string]string, moreOptions *LayerOptions, writeable bool, flags map[string]any) (layer *Layer, err error)
+	Put(id string, parent *Layer, names []string, mountLabel string, options map[string]string, moreOptions *LayerOptions, writeable bool, flags map[string]any, diff io.Reader) (*Layer, int64, error)
 	SetNames(id string, names []string) error
 	AddNames(id string, names []string) error
 	RemoveNames(id string, names []string) error

drivers/driver.go

@@ -79,7 +79,7 @@ type ApplyDiffOpts struct {
 type ApplyDiffWithDifferOpts struct {
 	ApplyDiffOpts
 
-	Flags map[string]interface{}
+	Flags map[string]any
 }
 
 // DedupArgs contains the information to perform storage deduplication.
@@ -222,7 +222,7 @@ type DriverWithDifferOutput struct {
 	RootDirMode *os.FileMode
 	// Artifacts is a collection of additional artifacts
 	// generated by the differ that the storage driver can use.
-	Artifacts map[string]interface{}
+	Artifacts map[string]any
 }
 
 type DifferOutputFormat int

drivers/overlay/composefs.go

@@ -42,7 +42,7 @@ func getComposefsBlob(dataDir string) string {
 	return filepath.Join(dataDir, "composefs.blob")
 }
 
-func generateComposeFsBlob(verityDigests map[string]string, toc interface{}, composefsDir string) error {
+func generateComposeFsBlob(verityDigests map[string]string, toc any, composefsDir string) error {
 	if err := os.MkdirAll(composefsDir, 0o700); err != nil {
 		return err
 	}

images.go

@@ -93,7 +93,7 @@ type Image struct {
 	// ReadOnly is true if this image resides in a read-only layer store.
 	ReadOnly bool `json:"-"`
 
-	Flags map[string]interface{} `json:"flags,omitempty"`
+	Flags map[string]any `json:"flags,omitempty"`
 }
 
 // roImageStore provides bookkeeping for information about Images.
@@ -675,7 +675,7 @@ func (r *imageStore) ClearFlag(id string, flag string) error {
 }
 
 // Requires startWriting.
-func (r *imageStore) SetFlag(id string, flag string, value interface{}) error {
+func (r *imageStore) SetFlag(id string, flag string, value any) error {
 	if !r.lockfile.IsReadWrite() {
 		return fmt.Errorf("not allowed to set flags on images at %q: %w", r.imagespath(), ErrStoreIsReadOnly)
 	}
@@ -684,7 +684,7 @@ func (r *imageStore) SetFlag(id string, flag string, value interface{}) error {
 		return fmt.Errorf("locating image with ID %q: %w", id, ErrImageUnknown)
 	}
 	if image.Flags == nil {
-		image.Flags = make(map[string]interface{})
+		image.Flags = make(map[string]any)
 	}
 	image.Flags[flag] = value
 	return r.Save()

layers.go

@@ -161,7 +161,7 @@ type Layer struct {
 	GIDs []uint32 `json:"gidset,omitempty"`
 
 	// Flags is arbitrary data about the layer.
-	Flags map[string]interface{} `json:"flags,omitempty"`
+	Flags map[string]any `json:"flags,omitempty"`
 
 	// UIDMap and GIDMap are used for setting up a layer's contents
 	// for use inside of a user namespace where UID mapping is being used.
@@ -922,7 +922,7 @@ func (r *layerStore) load(lockedForWriting bool) (bool, error) {
 		var layersToDelete []*Layer
 		for _, layer := range r.layers {
 			if layer.Flags == nil {
-				layer.Flags = make(map[string]interface{})
+				layer.Flags = make(map[string]any)
 			}
 			if layerHasIncompleteFlag(layer) {
 				// Important: Do not call r.deleteInternal() here. It modifies r.layers
@@ -1261,7 +1261,7 @@ func (r *layerStore) ClearFlag(id string, flag string) error {
 }
 
 // Requires startWriting.
-func (r *layerStore) SetFlag(id string, flag string, value interface{}) error {
+func (r *layerStore) SetFlag(id string, flag string, value any) error {
 	if !r.lockfile.IsReadWrite() {
 		return fmt.Errorf("not allowed to set flags on layers at %q: %w", r.layerdir, ErrStoreIsReadOnly)
 	}
@@ -1270,7 +1270,7 @@ func (r *layerStore) SetFlag(id string, flag string, value interface{}) error {
 		return ErrLayerUnknown
 	}
 	if layer.Flags == nil {
-		layer.Flags = make(map[string]interface{})
+		layer.Flags = make(map[string]any)
 	}
 	layer.Flags[flag] = value
 	return r.saveFor(layer)
@@ -1931,7 +1931,7 @@ func (r *layerStore) deleteInternal(id string) error {
 	// Ensure that if we are interrupted, the layer will be cleaned up.
 	if !layerHasIncompleteFlag(layer) {
 		if layer.Flags == nil {
-			layer.Flags = make(map[string]interface{})
+			layer.Flags = make(map[string]any)
 		}
 		layer.Flags[incompleteFlag] = true
 		if err := r.saveFor(layer); err != nil {
@@ -2540,7 +2540,7 @@ func (r *layerStore) applyDiffFromStagingDirectory(id string, diffOutput *driver
 	layer.Metadata = diffOutput.Metadata
 	if options != nil && options.Flags != nil {
 		if layer.Flags == nil {
-			layer.Flags = make(map[string]interface{})
+			layer.Flags = make(map[string]any)
 		}
 		maps.Copy(layer.Flags, options.Flags)
 	}

pkg/archive/archive.go

@@ -53,7 +53,7 @@ type (
 		// 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{}
+		WhiteoutData any
 		// When unpacking, specifies whether overwriting a directory with a
 		// non-directory is allowed and vice versa.
 		NoOverwriteDirNonDir bool
@@ -83,7 +83,7 @@ const (
 	freebsd = "freebsd"
 )
 
-var xattrsToIgnore = map[string]interface{}{
+var xattrsToIgnore = map[string]any{
 	"security.selinux": true,
 }
 
@@ -378,7 +378,7 @@ type nosysFileInfo struct {
 	os.FileInfo
 }
 
-func (fi nosysFileInfo) Sys() interface{} {
+func (fi nosysFileInfo) Sys() any {
 	// A Sys value of type *tar.Header is safe as it is system-independent.
 	// The tar.FileInfoHeader function copies the fields into the returned
 	// header without performing any OS lookups.

pkg/archive/archive_linux.go

@@ -16,7 +16,7 @@ func getOverlayOpaqueXattrName() string {
 	return GetOverlayXattrName("opaque")
 }
 
-func GetWhiteoutConverter(format WhiteoutFormat, data interface{}) TarWhiteoutConverter {
+func GetWhiteoutConverter(format WhiteoutFormat, data any) TarWhiteoutConverter {
 	if format == OverlayWhiteoutFormat {
 		if rolayers, ok := data.([]string); ok && len(rolayers) > 0 {
 			return overlayWhiteoutConverter{rolayers: rolayers}

pkg/archive/archive_unix.go

@@ -67,7 +67,7 @@ func chmodTarEntry(perm os.FileMode) os.FileMode {
 	return perm // noop for unix as golang APIs provide perm bits correctly
 }
 
-func setHeaderForSpecialDevice(hdr *tar.Header, name string, stat interface{}) (err error) {
+func setHeaderForSpecialDevice(hdr *tar.Header, name string, stat any) (err error) {
 	s, ok := stat.(*syscall.Stat_t)
 
 	if ok {
@@ -82,7 +82,7 @@ func setHeaderForSpecialDevice(hdr *tar.Header, name string, stat interface{}) (
 	return
 }
 
-func getInodeFromStat(stat interface{}) (inode uint64, err error) {
+func getInodeFromStat(stat any) (inode uint64, err error) {
 	s, ok := stat.(*syscall.Stat_t)
 
 	if ok {
@@ -92,7 +92,7 @@ func getInodeFromStat(stat interface{}) (inode uint64, err error) {
 	return
 }
 
-func getFileUIDGID(stat interface{}) (idtools.IDPair, error) {
+func getFileUIDGID(stat any) (idtools.IDPair, error) {
 	s, ok := stat.(*syscall.Stat_t)
 
 	if !ok {

pkg/chunked/dump/dump.go

@@ -214,7 +214,7 @@ func dumpNode(out io.Writer, added map[string]*minimal.FileMetadata, links map[s
 }
 
 // GenerateDump generates a dump of the TOC in the same format as `composefs-info dump`
-func GenerateDump(tocI interface{}, verityDigests map[string]string) (io.Reader, error) {
+func GenerateDump(tocI any, verityDigests map[string]string) (io.Reader, error) {
 	toc, ok := tocI.(*minimal.TOC)
 	if !ok {
 		return nil, fmt.Errorf("invalid TOC type")

pkg/chunked/storage_linux.go

@@ -111,7 +111,7 @@ type chunkedDiffer struct {
 	useFsVerity graphdriver.DifferFsVerity
 }
 
-var xattrsToIgnore = map[string]interface{}{
+var xattrsToIgnore = map[string]any{
 	"security.selinux": true,
 }
 
@@ -1483,7 +1483,7 @@ func (c *chunkedDiffer) ApplyDiff(dest string, options *archive.TarOptions, diff
 			bigDataKey:          c.manifest,
 			chunkedLayerDataKey: lcdBigData,
 		},
-		Artifacts: map[string]interface{}{
+		Artifacts: map[string]any{
 			tocKey: toc,
 		},
 		TOCDigest:          c.tocDigest,

pkg/ioutils/bytespipe.go

@@ -175,7 +175,7 @@ func getBuffer(size int) *fixedBuffer {
 	bufPoolsLock.Lock()
 	pool, ok := bufPools[size]
 	if !ok {
-		pool = &sync.Pool{New: func() interface{} { return &fixedBuffer{buf: make([]byte, 0, size)} }}
+		pool = &sync.Pool{New: func() any { return &fixedBuffer{buf: make([]byte, 0, size)} }}
 		bufPools[size] = pool
 	}
 	bufPoolsLock.Unlock()

pkg/mflag/flag.go

@@ -116,7 +116,7 @@ func (b *boolValue) Set(s string) error {
 	return err
 }
 
-func (b *boolValue) Get() interface{} { return bool(*b) }
+func (b *boolValue) Get() any { return bool(*b) }
 
 func (b *boolValue) String() string { return fmt.Sprintf("%v", *b) }
 
@@ -143,7 +143,7 @@ func (i *intValue) Set(s string) error {
 	return err
 }
 
-func (i *intValue) Get() interface{} { return int(*i) }
+func (i *intValue) Get() any { return int(*i) }
 
 func (i *intValue) String() string { return fmt.Sprintf("%v", *i) }
 
@@ -161,7 +161,7 @@ func (i *int64Value) Set(s string) error {
 	return err
 }
 
-func (i *int64Value) Get() interface{} { return int64(*i) }
+func (i *int64Value) Get() any { return int64(*i) }
 
 func (i *int64Value) String() string { return fmt.Sprintf("%v", *i) }
 
@@ -179,7 +179,7 @@ func (i *uintValue) Set(s string) error {
 	return err
 }
 
-func (i *uintValue) Get() interface{} { return uint(*i) }
+func (i *uintValue) Get() any { return uint(*i) }
 
 func (i *uintValue) String() string { return fmt.Sprintf("%v", *i) }
 
@@ -197,7 +197,7 @@ func (i *uint64Value) Set(s string) error {
 	return err
 }
 
-func (i *uint64Value) Get() interface{} { return uint64(*i) }
+func (i *uint64Value) Get() any { return uint64(*i) }
 
 func (i *uint64Value) String() string { return fmt.Sprintf("%v", *i) }
 
@@ -215,7 +215,7 @@ func (i *uint16Value) Set(s string) error {
 	return err
 }
 
-func (i *uint16Value) Get() interface{} { return uint16(*i) }
+func (i *uint16Value) Get() any { return uint16(*i) }
 
 func (i *uint16Value) String() string { return fmt.Sprintf("%v", *i) }
 
@@ -232,7 +232,7 @@ func (s *stringValue) Set(val string) error {
 	return nil
 }
 
-func (s *stringValue) Get() interface{} { return string(*s) }
+func (s *stringValue) Get() any { return string(*s) }
 
 func (s *stringValue) String() string { return string(*s) }
 
@@ -250,7 +250,7 @@ func (f *float64Value) Set(s string) error {
 	return err
 }
 
-func (f *float64Value) Get() interface{} { return float64(*f) }
+func (f *float64Value) Get() any { return float64(*f) }
 
 func (f *float64Value) String() string { return fmt.Sprintf("%v", *f) }
 
@@ -268,7 +268,7 @@ func (d *durationValue) Set(s string) error {
 	return err
 }
 
-func (d *durationValue) Get() interface{} { return time.Duration(*d) }
+func (d *durationValue) Get() any { return time.Duration(*d) }
 
 func (d *durationValue) String() string { return (*time.Duration)(d).String() }
 
@@ -289,7 +289,7 @@ type Value interface {
 // by this package satisfy the Getter interface.
 type Getter interface {
 	Value
-	Get() interface{}
+	Get() any
 }
 
 // ErrorHandling defines how to handle flag parsing errors.
@@ -932,7 +932,7 @@ func Var(value Value, names []string, usage string) {
 
 // failf prints to standard error a formatted error and usage message and
 // returns the error.
-func (fs *FlagSet) failf(format string, a ...interface{}) error {
+func (fs *FlagSet) failf(format string, a ...any) error {
 	err := fmt.Errorf(format, a...)
 	fmt.Fprintln(fs.Out(), err)
 	if os.Args[0] == fs.name {

pkg/pools/pools.go

@@ -40,7 +40,7 @@ func init() {
 // added here to be shared where required.
 func newBufioReaderPoolWithSize(size int) *BufioReaderPool {
 	pool := &sync.Pool{
-		New: func() interface{} { return bufio.NewReaderSize(nil, size) },
+		New: func() any { return bufio.NewReaderSize(nil, size) },
 	}
 	return &BufioReaderPool{pool: pool}
 }
@@ -87,7 +87,7 @@ type BufioWriterPool struct {
 // added here to be shared where required.
 func newBufioWriterPoolWithSize(size int) *BufioWriterPool {
 	pool := &sync.Pool{
-		New: func() interface{} { return bufio.NewWriterSize(nil, size) },
+		New: func() any { return bufio.NewWriterSize(nil, size) },
 	}
 	return &BufioWriterPool{pool: pool}
 }

pkg/unshare/unshare_linux.go

@@ -468,7 +468,7 @@ type Runnable interface {
 	Run() error
 }
 
-func bailOnError(err error, format string, a ...interface{}) { // nolint: revive,goprintffuncname
+func bailOnError(err error, format string, a ...any) { // nolint: revive,goprintffuncname
 	if err != nil {
 		if format != "" {
 			logrus.Errorf("%s: %v", fmt.Sprintf(format, a...), err)

store.go

@@ -162,7 +162,7 @@ type flaggableStore interface {
 	ClearFlag(id string, flag string) error
 
 	// SetFlag sets a named flag and its value on an item in the store.
-	SetFlag(id string, flag string, value interface{}) error
+	SetFlag(id string, flag string, value any) error
 }
 
 type StoreOptions = types.StoreOptions
@@ -672,7 +672,7 @@ type LayerOptions struct {
 	// Flags is a set of named flags and their values to store with the layer.
 	// Currently these can only be set when the layer record is created, but that
 	// could change in the future.
-	Flags map[string]interface{}
+	Flags map[string]any
 }
 
 type LayerBigDataOption struct {
@@ -700,7 +700,7 @@ type ImageOptions struct {
 	NamesHistory []string
 	// Flags is a set of named flags and their values to store with the image.  Currently these can only
 	// be set when the image record is created, but that could change in the future.
-	Flags map[string]interface{}
+	Flags map[string]any
 }
 
 type ImageBigDataOption struct {
@@ -720,7 +720,7 @@ type ContainerOptions struct {
 	// Flags is a set of named flags and their values to store with the container.
 	// Currently these can only be set when the container record is created, but that
 	// could change in the future.
-	Flags      map[string]interface{}
+	Flags      map[string]any
 	MountOpts  []string
 	Volatile   bool
 	StorageOpt map[string]string
@@ -1649,7 +1649,7 @@ func (s *store) CreateImage(id string, names []string, layer, metadata string, i
 			options.BigData = append(options.BigData, copyImageBigDataOptionSlice(iOptions.BigData)...)
 			options.NamesHistory = append(options.NamesHistory, iOptions.NamesHistory...)
 			if options.Flags == nil {
-				options.Flags = make(map[string]interface{})
+				options.Flags = make(map[string]any)
 			}
 			maps.Copy(options.Flags, iOptions.Flags)
 		}
@@ -1918,7 +1918,7 @@ func (s *store) CreateContainer(id string, names []string, image, layer, metadat
 		}
 	}
 	if options.Flags == nil {
-		options.Flags = make(map[string]interface{})
+		options.Flags = make(map[string]any)
 	}
 	plabel, _ := options.Flags[processLabelFlag].(string)
 	mlabel, _ := options.Flags[mountLabelFlag].(string)