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251 lines
8.5 KiB
Go
251 lines
8.5 KiB
Go
package images // import "github.com/docker/docker/daemon/images"
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import (
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"context"
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"os"
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"runtime"
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"github.com/docker/docker/container"
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daemonevents "github.com/docker/docker/daemon/events"
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"github.com/docker/docker/distribution"
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"github.com/docker/docker/distribution/metadata"
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"github.com/docker/docker/distribution/xfer"
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"github.com/docker/docker/image"
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"github.com/docker/docker/layer"
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dockerreference "github.com/docker/docker/reference"
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"github.com/docker/docker/registry"
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"github.com/docker/libtrust"
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digest "github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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type containerStore interface {
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// used by image delete
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First(container.StoreFilter) *container.Container
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// used by image prune, and image list
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List() []*container.Container
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// TODO: remove, only used for CommitBuildStep
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Get(string) *container.Container
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}
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// ImageServiceConfig is the configuration used to create a new ImageService
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type ImageServiceConfig struct {
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ContainerStore containerStore
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DistributionMetadataStore metadata.Store
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EventsService *daemonevents.Events
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ImageStore image.Store
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LayerStores map[string]layer.Store
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MaxConcurrentDownloads int
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MaxConcurrentUploads int
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MaxDownloadAttempts int
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ReferenceStore dockerreference.Store
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RegistryService registry.Service
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TrustKey libtrust.PrivateKey
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}
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// NewImageService returns a new ImageService from a configuration
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func NewImageService(config ImageServiceConfig) *ImageService {
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logrus.Debugf("Max Concurrent Downloads: %d", config.MaxConcurrentDownloads)
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logrus.Debugf("Max Concurrent Uploads: %d", config.MaxConcurrentUploads)
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logrus.Debugf("Max Download Attempts: %d", config.MaxDownloadAttempts)
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return &ImageService{
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containers: config.ContainerStore,
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distributionMetadataStore: config.DistributionMetadataStore,
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downloadManager: xfer.NewLayerDownloadManager(config.LayerStores, config.MaxConcurrentDownloads, xfer.WithMaxDownloadAttempts(config.MaxDownloadAttempts)),
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eventsService: config.EventsService,
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imageStore: config.ImageStore,
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layerStores: config.LayerStores,
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referenceStore: config.ReferenceStore,
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registryService: config.RegistryService,
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trustKey: config.TrustKey,
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uploadManager: xfer.NewLayerUploadManager(config.MaxConcurrentUploads),
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}
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}
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// ImageService provides a backend for image management
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type ImageService struct {
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containers containerStore
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distributionMetadataStore metadata.Store
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downloadManager *xfer.LayerDownloadManager
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eventsService *daemonevents.Events
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imageStore image.Store
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layerStores map[string]layer.Store // By operating system
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pruneRunning int32
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referenceStore dockerreference.Store
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registryService registry.Service
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trustKey libtrust.PrivateKey
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uploadManager *xfer.LayerUploadManager
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}
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// DistributionServices provides daemon image storage services
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type DistributionServices struct {
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DownloadManager distribution.RootFSDownloadManager
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V2MetadataService metadata.V2MetadataService
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LayerStore layer.Store // TODO: lcow
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ImageStore image.Store
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ReferenceStore dockerreference.Store
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}
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// DistributionServices return services controlling daemon image storage
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func (i *ImageService) DistributionServices() DistributionServices {
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return DistributionServices{
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DownloadManager: i.downloadManager,
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V2MetadataService: metadata.NewV2MetadataService(i.distributionMetadataStore),
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LayerStore: i.layerStores[runtime.GOOS],
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ImageStore: i.imageStore,
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ReferenceStore: i.referenceStore,
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}
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}
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// CountImages returns the number of images stored by ImageService
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// called from info.go
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func (i *ImageService) CountImages() int {
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return i.imageStore.Len()
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}
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// Children returns the children image.IDs for a parent image.
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// called from list.go to filter containers
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// TODO: refactor to expose an ancestry for image.ID?
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func (i *ImageService) Children(id image.ID) []image.ID {
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return i.imageStore.Children(id)
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}
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// CreateLayer creates a filesystem layer for a container.
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// called from create.go
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// TODO: accept an opt struct instead of container?
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func (i *ImageService) CreateLayer(container *container.Container, initFunc layer.MountInit) (layer.RWLayer, error) {
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var layerID layer.ChainID
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if container.ImageID != "" {
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img, err := i.imageStore.Get(container.ImageID)
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if err != nil {
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return nil, err
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}
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layerID = img.RootFS.ChainID()
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}
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rwLayerOpts := &layer.CreateRWLayerOpts{
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MountLabel: container.MountLabel,
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InitFunc: initFunc,
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StorageOpt: container.HostConfig.StorageOpt,
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}
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// Indexing by OS is safe here as validation of OS has already been performed in create() (the only
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// caller), and guaranteed non-nil
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return i.layerStores[container.OS].CreateRWLayer(container.ID, layerID, rwLayerOpts)
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}
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// GetLayerByID returns a layer by ID and operating system
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// called from daemon.go Daemon.restore(), and Daemon.containerExport()
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func (i *ImageService) GetLayerByID(cid string, os string) (layer.RWLayer, error) {
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return i.layerStores[os].GetRWLayer(cid)
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}
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// LayerStoreStatus returns the status for each layer store
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// called from info.go
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func (i *ImageService) LayerStoreStatus() map[string][][2]string {
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result := make(map[string][][2]string)
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for os, store := range i.layerStores {
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result[os] = store.DriverStatus()
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}
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return result
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}
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// GetLayerMountID returns the mount ID for a layer
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// called from daemon.go Daemon.Shutdown(), and Daemon.Cleanup() (cleanup is actually continerCleanup)
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// TODO: needs to be refactored to Unmount (see callers), or removed and replaced
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// with GetLayerByID
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func (i *ImageService) GetLayerMountID(cid string, os string) (string, error) {
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return i.layerStores[os].GetMountID(cid)
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}
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// Cleanup resources before the process is shutdown.
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// called from daemon.go Daemon.Shutdown()
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func (i *ImageService) Cleanup() {
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for os, ls := range i.layerStores {
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if ls != nil {
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if err := ls.Cleanup(); err != nil {
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logrus.Errorf("Error during layer Store.Cleanup(): %v %s", err, os)
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}
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}
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}
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}
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// GraphDriverForOS returns the name of the graph drvier
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// moved from Daemon.GraphDriverName, used by:
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// - newContainer
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// - to report an error in Daemon.Mount(container)
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func (i *ImageService) GraphDriverForOS(os string) string {
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return i.layerStores[os].DriverName()
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}
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// ReleaseLayer releases a layer allowing it to be removed
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// called from delete.go Daemon.cleanupContainer(), and Daemon.containerExport()
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func (i *ImageService) ReleaseLayer(rwlayer layer.RWLayer, containerOS string) error {
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metadata, err := i.layerStores[containerOS].ReleaseRWLayer(rwlayer)
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layer.LogReleaseMetadata(metadata)
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if err != nil && !errors.Is(err, layer.ErrMountDoesNotExist) && !errors.Is(err, os.ErrNotExist) {
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return errors.Wrapf(err, "driver %q failed to remove root filesystem",
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i.layerStores[containerOS].DriverName())
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}
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return nil
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}
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// LayerDiskUsage returns the number of bytes used by layer stores
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// called from disk_usage.go
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func (i *ImageService) LayerDiskUsage(ctx context.Context) (int64, error) {
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var allLayersSize int64
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layerRefs := i.getLayerRefs()
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for _, ls := range i.layerStores {
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allLayers := ls.Map()
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for _, l := range allLayers {
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select {
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case <-ctx.Done():
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return allLayersSize, ctx.Err()
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default:
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size, err := l.DiffSize()
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if err == nil {
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if _, ok := layerRefs[l.ChainID()]; ok {
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allLayersSize += size
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}
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} else {
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logrus.Warnf("failed to get diff size for layer %v", l.ChainID())
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}
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}
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}
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}
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return allLayersSize, nil
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}
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func (i *ImageService) getLayerRefs() map[layer.ChainID]int {
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tmpImages := i.imageStore.Map()
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layerRefs := map[layer.ChainID]int{}
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for id, img := range tmpImages {
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dgst := digest.Digest(id)
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if len(i.referenceStore.References(dgst)) == 0 && len(i.imageStore.Children(id)) != 0 {
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continue
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}
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rootFS := *img.RootFS
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rootFS.DiffIDs = nil
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for _, id := range img.RootFS.DiffIDs {
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rootFS.Append(id)
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chid := rootFS.ChainID()
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layerRefs[chid]++
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}
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}
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return layerRefs
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}
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// UpdateConfig values
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//
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// called from reload.go
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func (i *ImageService) UpdateConfig(maxDownloads, maxUploads *int) {
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if i.downloadManager != nil && maxDownloads != nil {
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i.downloadManager.SetConcurrency(*maxDownloads)
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}
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if i.uploadManager != nil && maxUploads != nil {
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i.uploadManager.SetConcurrency(*maxUploads)
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}
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}
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