image

Documentation

Index

• Constants
• type ChildConfig
• type DigestWalkFunc
• type Exporter
• type History
  • func NewHistory(author, comment, createdBy string, isEmptyLayer bool) History
• type ID
  • func IDFromDigest(digest digest.Digest) ID
  • func (id ID) Digest() digest.Digest
  • func (id ID) String() string
• type Image
  • func NewChildImage(img *Image, child ChildConfig, os string) *Image
  • func NewFromJSON(src []byte) (*Image, error)
  • func (img *Image) BaseImgArch() string
  • func (img *Image) BaseImgVariant() string
  • func (img *Image) ID() ID
  • func (img *Image) ImageID() string
  • func (img *Image) MarshalJSON() ([]byte, error)
  • func (img *Image) OperatingSystem() string
  • func (img *Image) RawJSON() []byte
  • func (img *Image) RunConfig() *container.Config
• type LayerGetReleaser
• type RootFS
  • func NewRootFS() *RootFS
  • func (r *RootFS) Append(id layer.DiffID)
  • func (r *RootFS) ChainID() layer.ChainID
  • func (r *RootFS) Clone() *RootFS
• type Store
  • func NewImageStore(fs StoreBackend, lss map[string]LayerGetReleaser) (Store, error)
• type StoreBackend
  • func NewFSStoreBackend(root string) (StoreBackend, error)
• type V1Image

Constants

const TypeLayers = "layers"

TypeLayers is used for RootFS.Type for filesystems organized into layers.

Types

type ChildConfig

type ChildConfig struct {
	ContainerID     string
	Author          string
	Comment         string
	DiffID          layer.DiffID
	ContainerConfig *container.Config
	Config          *container.Config
}

ChildConfig is the configuration to apply to an Image to create a new Child image. Other properties of the image are copied from the parent.

type DigestWalkFunc

type DigestWalkFunc func(id digest.Digest) error

DigestWalkFunc is function called by StoreBackend.Walk

type Exporter

type Exporter interface {
	Load(io.ReadCloser, io.Writer, bool) error
	// TODO: Load(net.Context, io.ReadCloser, <- chan StatusMessage) error
	Save([]string, io.Writer) error
}

Exporter provides interface for loading and saving images

type History

type History struct {
	// Created is the timestamp at which the image was created
	Created time.Time `json:"created"`
	// Author is the name of the author that was specified when committing the image
	Author string `json:"author,omitempty"`
	// CreatedBy keeps the Dockerfile command used while building the image
	CreatedBy string `json:"created_by,omitempty"`
	// Comment is the commit message that was set when committing the image
	Comment string `json:"comment,omitempty"`
	// EmptyLayer is set to true if this history item did not generate a
	// layer. Otherwise, the history item is associated with the next
	// layer in the RootFS section.
	EmptyLayer bool `json:"empty_layer,omitempty"`
}

History stores build commands that were used to create an image

func NewHistory

func NewHistory(author, comment, createdBy string, isEmptyLayer bool) History

NewHistory creates a new history struct from arguments, and sets the created time to the current time in UTC

type ID

type ID digest.Digest

ID is the content-addressable ID of an image.

func IDFromDigest

func IDFromDigest(digest digest.Digest) ID

IDFromDigest creates an ID from a digest

func (ID) Digest

func (id ID) Digest() digest.Digest

Digest converts ID into a digest

func (ID) String

func (id ID) String() string

type Image

type Image struct {
	V1Image
	Parent     ID        `json:"parent,omitempty"` //nolint:govet
	RootFS     *RootFS   `json:"rootfs,omitempty"`
	History    []History `json:"history,omitempty"`
	OSVersion  string    `json:"os.version,omitempty"`
	OSFeatures []string  `json:"os.features,omitempty"`
	// contains filtered or unexported fields
}

Image stores the image configuration

func NewChildImage

func NewChildImage(img *Image, child ChildConfig, os string) *Image

NewChildImage creates a new Image as a child of this image.

func NewFromJSON

func NewFromJSON(src []byte) (*Image, error)

NewFromJSON creates an Image configuration from json.

func (*Image) BaseImgArch

func (img *Image) BaseImgArch() string

BaseImgArch returns the image's architecture. If not populated, defaults to the host runtime arch.

func (*Image) BaseImgVariant

func (img *Image) BaseImgVariant() string

BaseImgVariant returns the image's variant, whether populated or not. This avoids creating an inconsistency where the stored image variant is "greater than" (i.e. v8 vs v6) the actual image variant.

func (*Image) ID

func (img *Image) ID() ID

ID returns the image's content-addressable ID.

func (*Image) ImageID

func (img *Image) ImageID() string

ImageID stringifies ID.

func (*Image) MarshalJSON

func (img *Image) MarshalJSON() ([]byte, error)

MarshalJSON serializes the image to JSON. It sorts the top-level keys so that JSON that's been manipulated by a push/pull cycle with a legacy registry won't end up with a different key order.

func (*Image) OperatingSystem

func (img *Image) OperatingSystem() string

OperatingSystem returns the image's operating system. If not populated, defaults to the host runtime OS.

func (*Image) RawJSON

func (img *Image) RawJSON() []byte

RawJSON returns the immutable JSON associated with the image.

func (*Image) RunConfig

func (img *Image) RunConfig() *container.Config

RunConfig returns the image's container config.

type LayerGetReleaser

type LayerGetReleaser interface {
	Get(layer.ChainID) (layer.Layer, error)
	Release(layer.Layer) ([]layer.Metadata, error)
}

LayerGetReleaser is a minimal interface for getting and releasing images.

type RootFS

type RootFS struct {
	Type    string         `json:"type"`
	DiffIDs []layer.DiffID `json:"diff_ids,omitempty"`
}

RootFS describes images root filesystem This is currently a placeholder that only supports layers. In the future this can be made into an interface that supports different implementations.

func NewRootFS

func NewRootFS() *RootFS

NewRootFS returns empty RootFS struct

func (*RootFS) Append

func (r *RootFS) Append(id layer.DiffID)

Append appends a new diffID to rootfs

func (*RootFS) ChainID

func (r *RootFS) ChainID() layer.ChainID

ChainID returns the ChainID for the top layer in RootFS.

func (*RootFS) Clone

func (r *RootFS) Clone() *RootFS

Clone returns a copy of the RootFS

type Store

type Store interface {
	Create(config []byte) (ID, error)
	Get(id ID) (*Image, error)
	Delete(id ID) ([]layer.Metadata, error)
	Search(partialID string) (ID, error)
	SetParent(id ID, parent ID) error
	GetParent(id ID) (ID, error)
	SetLastUpdated(id ID) error
	GetLastUpdated(id ID) (time.Time, error)
	Children(id ID) []ID
	Map() map[ID]*Image
	Heads() map[ID]*Image
	Len() int
}

Store is an interface for creating and accessing images

func NewImageStore

func NewImageStore(fs StoreBackend, lss map[string]LayerGetReleaser) (Store, error)

NewImageStore returns new store object for given set of layer stores

type StoreBackend

type StoreBackend interface {
	Walk(f DigestWalkFunc) error
	Get(id digest.Digest) ([]byte, error)
	Set(data []byte) (digest.Digest, error)
	Delete(id digest.Digest) error
	SetMetadata(id digest.Digest, key string, data []byte) error
	GetMetadata(id digest.Digest, key string) ([]byte, error)
	DeleteMetadata(id digest.Digest, key string) error
}

StoreBackend provides interface for image.Store persistence

func NewFSStoreBackend

func NewFSStoreBackend(root string) (StoreBackend, error)

NewFSStoreBackend returns new filesystem based backend for image.Store

type V1Image

type V1Image struct {
	// ID is a unique 64 character identifier of the image
	ID string `json:"id,omitempty"`
	// Parent is the ID of the parent image
	Parent string `json:"parent,omitempty"`
	// Comment is the commit message that was set when committing the image
	Comment string `json:"comment,omitempty"`
	// Created is the timestamp at which the image was created
	Created time.Time `json:"created"`
	// Container is the id of the container used to commit
	Container string `json:"container,omitempty"`
	// ContainerConfig is the configuration of the container that is committed into the image
	ContainerConfig container.Config `json:"container_config,omitempty"`
	// DockerVersion specifies the version of Docker that was used to build the image
	DockerVersion string `json:"docker_version,omitempty"`
	// Author is the name of the author that was specified when committing the image
	Author string `json:"author,omitempty"`
	// Config is the configuration of the container received from the client
	Config *container.Config `json:"config,omitempty"`
	// Architecture is the hardware that the image is built and runs on
	Architecture string `json:"architecture,omitempty"`
	// Variant is the CPU architecture variant (presently ARM-only)
	Variant string `json:"variant,omitempty"`
	// OS is the operating system used to build and run the image
	OS string `json:"os,omitempty"`
	// Size is the total size of the image including all layers it is composed of
	Size int64 `json:",omitempty"`
}

V1Image stores the V1 image configuration.