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Showing content from https://pkg.go.dev/github.com/moby/moby/v2@v2.0.0-20250814210528-a34c4d9bb99f/daemon/internal/layer below:

layer package - github.com/moby/moby/v2/daemon/internal/layer - Go Packages

Package layer is package for managing read-only and read-write mounts on the union file system driver. Read-only mounts are referenced using a content hash and are protected from mutation in the exposed interface. The tar format is used to create read-only layers and export both read-only and writable layers. The exported tar data for a read-only layer should match the tar used to create the layer.

• Variables
• func IsEmpty(diffID DiffID) bool
• func ReleaseAndLog(ls Store, l Layer)
• type ChainID
• • func CreateChainID(dgsts []DiffID) ChainIDdeprecated
• type CreateRWLayerOpts
• type DescribableStore
• type DiffID
• type Layer
• type Metadata
• type MountInit
• type RWLayer
• type Store
• • func NewStoreFromOptions(options StoreOptions) (Store, error)
• type StoreOptions
• type TarStreamer

This section is empty.

var (
	
	
	ErrLayerDoesNotExist = errors.New("layer does not exist")

	
	
	ErrLayerNotRetained = errors.New("layer not retained")

	
	
	ErrMountDoesNotExist = errors.New("mount does not exist")

	
	
	
	ErrMountNameConflict = errors.New("mount already exists with name")

	
	
	
	ErrMaxDepthExceeded = errors.New("max depth exceeded")
)

EmptyLayer is a layer that corresponds to empty tar.

IsEmpty returns true if the layer is an EmptyLayer

ReleaseAndLog releases the provided layer from the given layer store, logging any error and release metadata

type ChainID = digest.Digest

ChainID is the content-addressable ID of a layer.

CreateChainID returns ID for a layerDigest slice.

Deprecated: use identity.ChainID.

CreateRWLayerOpts contains optional arguments to be passed to CreateRWLayer

DescribableStore represents a layer store capable of storing descriptors for layers.

type DiffID = digest.Digest

DiffID is the hash of an individual layer tar.

const DigestSHA256EmptyTar DiffID = "sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef"

DigestSHA256EmptyTar is the canonical sha256 digest of empty tar file - (1024 NULL bytes)

Layer represents a read-only layer

Metadata holds information about a read-only layer

MountInit is a function to initialize a writable mount. Changes made here will not be included in the Tar stream of the RWLayer.

RWLayer represents a layer which is read and writable

type Store interface {
	Register(io.Reader, ChainID) (Layer, error)
	Get(ChainID) (Layer, error)
	Map() map[ChainID]Layer
	Release(Layer) ([]Metadata, error)
	CreateRWLayer(id string, parent ChainID, opts *CreateRWLayerOpts) (RWLayer, error)
	GetRWLayer(id string) (RWLayer, error)
	GetMountID(id string) (string, error)
	ReleaseRWLayer(RWLayer) ([]Metadata, error)
	Cleanup() error
	DriverStatus() [][2]string
	DriverName() string
}

Store represents a backend for managing both read-only and read-write layers.

NewStoreFromOptions creates a new Store instance

StoreOptions are the options used to create a new Store instance

TarStreamer represents an object which may have its contents exported as a tar stream.

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