images

package
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 Go to latest Published: Nov 11, 2022 License: Apache-2.0 Imports: 62 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func OnlyPlatformWithFallback 

func OnlyPlatformWithFallback(p specs.Platform) platforms.Matcher

OnlyPlatformWithFallback uses `platforms.Only` with a fallback to handle the case where the platform being matched does not have a CPU variant.

The reason for this is that CPU variant is not even if the official image config spec as of this writing. See: https://github.com/opencontainers/image-spec/pull/809 Since Docker tends to compare platforms from the image config, we need to handle this case.

Types

type DistributionServices 

type DistributionServices struct {
	DownloadManager   *xfer.LayerDownloadManager
	V2MetadataService metadata.V2MetadataService
	LayerStore        layer.Store
	ImageStore        image.Store
	ReferenceStore    dockerreference.Store
}

DistributionServices provides daemon image storage services

type ErrImageDoesNotExist 

type ErrImageDoesNotExist struct {
	// contains filtered or unexported fields
}

ErrImageDoesNotExist is error returned when no image can be found for a reference.

func (ErrImageDoesNotExist) Error 

func (e ErrImageDoesNotExist) Error() string

func (ErrImageDoesNotExist) NotFound 

func (e ErrImageDoesNotExist) NotFound()

NotFound implements the NotFound interface

type ImageService 

type ImageService struct {
	// contains filtered or unexported fields
}

ImageService provides a backend for image management

func NewImageService 

func NewImageService(config ImageServiceConfig) *ImageService

NewImageService returns a new ImageService from a configuration

func (*ImageService) Children 

func (i *ImageService) Children(id image.ID) []image.ID

Children returns the children image.IDs for a parent image. called from list.go to filter containers TODO: refactor to expose an ancestry for image.ID?

func (*ImageService) Cleanup 

func (i *ImageService) Cleanup() error

Cleanup resources before the process is shutdown. called from daemon.go Daemon.Shutdown()

func (*ImageService) CommitBuildStep 

func (i *ImageService) CommitBuildStep(c backend.CommitConfig) (image.ID, error)

CommitBuildStep is used by the builder to create an image for each step in the build.

This method is different from CreateImageFromContainer:

  • it doesn't attempt to validate container state
  • it doesn't send a commit action to metrics
  • it doesn't log a container commit event

This is a temporary shim. Should be removed when builder stops using commit.

func (*ImageService) CommitImage 

func (i *ImageService) CommitImage(c backend.CommitConfig) (image.ID, error)

CommitImage creates a new image from a commit config

func (*ImageService) CountImages 

func (i *ImageService) CountImages() int

CountImages returns the number of images stored by ImageService called from info.go

func (*ImageService) CreateImage 

func (i *ImageService) CreateImage(config []byte, parent string) (builder.Image, error)

CreateImage creates a new image by adding a config and ID to the image store. This is similar to LoadImage() except that it receives JSON encoded bytes of an image instead of a tar archive.

func (*ImageService) CreateLayer 

func (i *ImageService) CreateLayer(container *container.Container, initFunc layer.MountInit) (layer.RWLayer, error)

CreateLayer creates a filesystem layer for a container. called from create.go TODO: accept an opt struct instead of container?

func (*ImageService) DistributionServices 

func (i *ImageService) DistributionServices() DistributionServices

DistributionServices return services controlling daemon image storage

func (*ImageService) ExportImage 

func (i *ImageService) ExportImage(ctx context.Context, names []string, outStream io.Writer) error

ExportImage exports a list of images to the given output stream. The exported images are archived into a tar when written to the output stream. All images with the given tag and all versions containing the same tag are exported. names is the set of tags to export, and outStream is the writer which the images are written to.

func (*ImageService) GetContainerLayerSize 

func (i *ImageService) GetContainerLayerSize(containerID string) (int64, int64)

GetContainerLayerSize returns the real size & virtual size of the container.

func (*ImageService) GetImage 

func (i *ImageService) GetImage(ctx context.Context, refOrID string, options imagetypes.GetImageOpts) (retImg *image.Image, retErr error)

GetImage returns an image corresponding to the image referred to by refOrID.

func (*ImageService) GetImageAndReleasableLayer 

func (i *ImageService) GetImageAndReleasableLayer(ctx context.Context, refOrID string, opts backend.GetImageAndLayerOptions) (builder.Image, builder.ROLayer, error)

GetImageAndReleasableLayer returns an image and releaseable layer for a reference or ID. Every call to GetImageAndReleasableLayer MUST call releasableLayer.Release() to prevent leaking of layers.

func (*ImageService) GetLayerByID 

func (i *ImageService) GetLayerByID(cid string) (layer.RWLayer, error)

GetLayerByID returns a layer by ID called from daemon.go Daemon.restore(), and Daemon.containerExport().

func (*ImageService) GetLayerFolders 

func (i *ImageService) GetLayerFolders(img *image.Image, rwLayer layer.RWLayer) ([]string, error)

GetLayerFolders returns the layer folders from an image RootFS

func (*ImageService) GetLayerMountID 

func (i *ImageService) GetLayerMountID(cid string) (string, error)

GetLayerMountID returns the mount ID for a layer called from daemon.go Daemon.Shutdown(), and Daemon.Cleanup() (cleanup is actually continerCleanup) TODO: needs to be refactored to Unmount (see callers), or removed and replaced with GetLayerByID

func (*ImageService) GetRepository 

func (i *ImageService) GetRepository(ctx context.Context, ref reference.Named, authConfig *registry.AuthConfig) (dist.Repository, error)

GetRepository returns a repository from the registry.

func (*ImageService) ImageDelete 

func (i *ImageService) ImageDelete(ctx context.Context, imageRef string, force, prune bool) ([]types.ImageDeleteResponseItem, error)

ImageDelete deletes the image referenced by the given imageRef from this daemon. The given imageRef can be an image ID, ID prefix, or a repository reference (with an optional tag or digest, defaulting to the tag name "latest"). There is differing behavior depending on whether the given imageRef is a repository reference or not.

If the given imageRef is a repository reference then that repository reference will be removed. However, if there exists any containers which were created using the same image reference then the repository reference cannot be removed unless either there are other repository references to the same image or force is true. Following removal of the repository reference, the referenced image itself will attempt to be deleted as described below but quietly, meaning any image delete conflicts will cause the image to not be deleted and the conflict will not be reported.

There may be conflicts preventing deletion of an image and these conflicts are divided into two categories grouped by their severity:

Hard Conflict:

  • a pull or build using the image.
  • any descendant image.
  • any running container using the image.

Soft Conflict:

  • any stopped container using the image.
  • any repository tag or digest references to the image.

The image cannot be removed if there are any hard conflicts and can be removed if there are soft conflicts only if force is true.

If prune is true, ancestor images will each attempt to be deleted quietly, meaning any delete conflicts will cause the image to not be deleted and the conflict will not be reported.

func (*ImageService) ImageDiskUsage 

func (i *ImageService) ImageDiskUsage(ctx context.Context) ([]*types.ImageSummary, error)

ImageDiskUsage returns information about image data disk usage.

func (*ImageService) ImageHistory 

func (i *ImageService) ImageHistory(name string) ([]*image.HistoryResponseItem, error)

ImageHistory returns a slice of ImageHistory structures for the specified image name by walking the image lineage.

func (*ImageService) Images 

func (i *ImageService) Images(ctx context.Context, opts types.ImageListOptions) ([]*types.ImageSummary, error)

Images returns a filtered list of images.

func (*ImageService) ImagesPrune 

func (i *ImageService) ImagesPrune(ctx context.Context, pruneFilters filters.Args) (*types.ImagesPruneReport, error)

ImagesPrune removes unused images

func (*ImageService) ImportImage 

func (i *ImageService) ImportImage(ctx context.Context, src string, repository string, platform *specs.Platform, tag string, msg string, inConfig io.ReadCloser, outStream io.Writer, changes []string) error

ImportImage imports an image, getting the archived layer data either from inConfig (if src is "-"), or from a URI specified in src. Progress output is written to outStream. Repository and tag names can optionally be given in the repo and tag arguments, respectively.

func (*ImageService) LayerDiskUsage 

func (i *ImageService) LayerDiskUsage(ctx context.Context) (int64, error)

LayerDiskUsage returns the number of bytes used by layer stores called from disk_usage.go

func (*ImageService) LayerStoreStatus 

func (i *ImageService) LayerStoreStatus() [][2]string

LayerStoreStatus returns the status for each layer store called from info.go

func (*ImageService) LoadImage 

func (i *ImageService) LoadImage(ctx context.Context, inTar io.ReadCloser, outStream io.Writer, quiet bool) error

LoadImage uploads a set of images into the repository. This is the complement of ExportImage. The input stream is an uncompressed tar ball containing images and metadata.

func (*ImageService) LogImageEvent 

func (i *ImageService) LogImageEvent(imageID, refName, action string)

LogImageEvent generates an event related to an image with only the default attributes.

func (*ImageService) LogImageEventWithAttributes 

func (i *ImageService) LogImageEventWithAttributes(imageID, refName, action string, attributes map[string]string)

LogImageEventWithAttributes generates an event related to an image with specific given attributes.

func (*ImageService) MakeImageCache 

func (i *ImageService) MakeImageCache(ctx context.Context, sourceRefs []string) (builder.ImageCache, error)

MakeImageCache creates a stateful image cache.

func (*ImageService) PullImage 

func (i *ImageService) PullImage(ctx context.Context, image, tag string, platform *specs.Platform, metaHeaders map[string][]string, authConfig *registry.AuthConfig, outStream io.Writer) error

PullImage initiates a pull operation. image is the repository name to pull, and tag may be either empty, or indicate a specific tag to pull.

func (*ImageService) PushImage 

func (i *ImageService) PushImage(ctx context.Context, image, tag string, metaHeaders map[string][]string, authConfig *registry.AuthConfig, outStream io.Writer) error

PushImage initiates a push operation on the repository named localName.

func (*ImageService) ReleaseLayer 

func (i *ImageService) ReleaseLayer(rwlayer layer.RWLayer) error

ReleaseLayer releases a layer allowing it to be removed called from delete.go Daemon.cleanupContainer(), and Daemon.containerExport()

func (*ImageService) SearchRegistryForImages 

func (i *ImageService) SearchRegistryForImages(ctx context.Context, searchFilters filters.Args, term string, limit int,
	authConfig *registry.AuthConfig,
	headers map[string][]string) (*registry.SearchResults, error)

SearchRegistryForImages queries the registry for images matching term. authConfig is used to login.

TODO: this could be implemented in a registry service instead of the image service.

func (*ImageService) SquashImage 

func (i *ImageService) SquashImage(id, parent string) (string, error)

SquashImage creates a new image with the diff of the specified image and the specified parent. This new image contains only the layers from it's parent + 1 extra layer which contains the diff of all the layers in between. The existing image(s) is not destroyed. If no parent is specified, a new image with the diff of all the specified image's layers merged into a new layer that has no parents.

func (*ImageService) StorageDriver 

func (i *ImageService) StorageDriver() string

StorageDriver returns the name of the storage driver used by the ImageService.

func (*ImageService) TagImage 

func (i *ImageService) TagImage(imageName, repository, tag string) (string, error)

TagImage creates the tag specified by newTag, pointing to the image named imageName (alternatively, imageName can also be an image ID).

func (*ImageService) TagImageWithReference 

func (i *ImageService) TagImageWithReference(imageID image.ID, newTag reference.Named) error

TagImageWithReference adds the given reference to the image ID provided.

func (*ImageService) UpdateConfig 

func (i *ImageService) UpdateConfig(maxDownloads, maxUploads int)

UpdateConfig values

called from reload.go

type ImageServiceConfig 

type ImageServiceConfig struct {
	ContainerStore            containerStore
	DistributionMetadataStore metadata.Store
	EventsService             *daemonevents.Events
	ImageStore                image.Store
	LayerStore                layer.Store
	MaxConcurrentDownloads    int
	MaxConcurrentUploads      int
	MaxDownloadAttempts       int
	ReferenceStore            dockerreference.Store
	RegistryService           registry.Service
	TrustKey                  libtrust.PrivateKey
	ContentStore              content.Store
	Leases                    leases.Manager
	ContentNamespace          string
}

ImageServiceConfig is the configuration used to create a new ImageService

Source Files

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