package image import ( "encoding/json" "errors" "io" "time" "github.com/docker/distribution/digest" "github.com/docker/docker/runconfig" ) // ID is the content-addressable ID of an image. type ID digest.Digest func (id ID) String() string { return digest.Digest(id).String() } // V1Image stores the V1 image configuration. type V1Image struct { // ID a unique 64 character identifier of the image ID string `json:"id,omitempty"` // Parent id of the image Parent string `json:"parent,omitempty"` // Comment user added comment Comment string `json:"comment,omitempty"` // Created timestamp when 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 runconfig.Config `json:"container_config,omitempty"` // DockerVersion specifies version on which image is built DockerVersion string `json:"docker_version,omitempty"` // Author of the image Author string `json:"author,omitempty"` // Config is the configuration of the container received from the client Config *runconfig.Config `json:"config,omitempty"` // Architecture is the hardware that the image is build and runs on Architecture string `json:"architecture,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"` } // Image stores the image configuration type Image struct { V1Image Parent ID `json:"parent,omitempty"` RootFS *RootFS `json:"rootfs,omitempty"` History []History `json:"history,omitempty"` // rawJSON caches the immutable JSON associated with this image. rawJSON []byte // computedID is the ID computed from the hash of the image config. // Not to be confused with the legacy V1 ID in V1Image. computedID ID } // RawJSON returns the immutable JSON associated with the image. func (img *Image) RawJSON() []byte { return img.rawJSON } // ID returns the image's content-addressable ID. func (img *Image) ID() ID { return img.computedID } // 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 (img *Image) MarshalJSON() ([]byte, error) { type MarshalImage Image pass1, err := json.Marshal(MarshalImage(*img)) if err != nil { return nil, err } var c map[string]*json.RawMessage if err := json.Unmarshal(pass1, &c); err != nil { return nil, err } return json.Marshal(c) } // History stores build commands that were used to create an image type History struct { // Created timestamp for build point Created time.Time `json:"created"` // Author of the build point Author string `json:"author,omitempty"` // CreatedBy keeps the Dockerfile command used while building image. CreatedBy string `json:"created_by,omitempty"` // Comment is custom message set by the user when creating 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"` } // Exporter provides interface for exporting and importing images type Exporter interface { Load(io.ReadCloser, io.Writer) error // TODO: Load(net.Context, io.ReadCloser, <- chan StatusMessage) error Save([]string, io.Writer) error } // NewFromJSON creates an Image configuration from json. func NewFromJSON(src []byte) (*Image, error) { img := &Image{} if err := json.Unmarshal(src, img); err != nil { return nil, err } if img.RootFS == nil { return nil, errors.New("Invalid image JSON, no RootFS key.") } img.rawJSON = src return img, nil }