mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
357 lines
9.7 KiB
Go
357 lines
9.7 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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"encoding/json"
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"fmt"
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"sort"
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"time"
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"github.com/pkg/errors"
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"github.com/docker/distribution/reference"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/container"
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"github.com/docker/docker/image"
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"github.com/docker/docker/layer"
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"github.com/docker/docker/pkg/system"
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)
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var acceptedImageFilterTags = map[string]bool{
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"dangling": true,
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"label": true,
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"before": true,
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"since": true,
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"reference": true,
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}
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// byCreated is a temporary type used to sort a list of images by creation
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// time.
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type byCreated []*types.ImageSummary
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func (r byCreated) Len() int { return len(r) }
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func (r byCreated) Swap(i, j int) { r[i], r[j] = r[j], r[i] }
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func (r byCreated) Less(i, j int) bool { return r[i].Created < r[j].Created }
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// Map returns a map of all images in the ImageStore
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func (i *ImageService) Map() map[image.ID]*image.Image {
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return i.imageStore.Map()
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}
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// Images returns a filtered list of images.
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func (i *ImageService) Images(_ context.Context, opts types.ImageListOptions) ([]*types.ImageSummary, error) {
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if err := opts.Filters.Validate(acceptedImageFilterTags); err != nil {
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return nil, err
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}
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var danglingOnly bool
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if opts.Filters.Contains("dangling") {
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if opts.Filters.ExactMatch("dangling", "true") {
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danglingOnly = true
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} else if !opts.Filters.ExactMatch("dangling", "false") {
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return nil, invalidFilter{"dangling", opts.Filters.Get("dangling")}
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}
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}
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var (
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beforeFilter, sinceFilter *image.Image
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err error
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)
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err = opts.Filters.WalkValues("before", func(value string) error {
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beforeFilter, err = i.GetImage(value, nil)
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return err
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})
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if err != nil {
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return nil, err
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}
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err = opts.Filters.WalkValues("since", func(value string) error {
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sinceFilter, err = i.GetImage(value, nil)
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return err
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})
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if err != nil {
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return nil, err
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}
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var selectedImages map[image.ID]*image.Image
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if danglingOnly {
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selectedImages = i.imageStore.Heads()
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} else {
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selectedImages = i.imageStore.Map()
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}
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var (
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summaries = make([]*types.ImageSummary, 0, len(selectedImages))
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summaryMap map[*image.Image]*types.ImageSummary
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allContainers []*container.Container
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)
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for id, img := range selectedImages {
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if beforeFilter != nil {
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if img.Created.Equal(beforeFilter.Created) || img.Created.After(beforeFilter.Created) {
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continue
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}
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}
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if sinceFilter != nil {
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if img.Created.Equal(sinceFilter.Created) || img.Created.Before(sinceFilter.Created) {
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continue
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}
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}
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if opts.Filters.Contains("label") {
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// Very old image that do not have image.Config (or even labels)
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if img.Config == nil {
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continue
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}
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// We are now sure image.Config is not nil
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if !opts.Filters.MatchKVList("label", img.Config.Labels) {
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continue
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}
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}
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// Skip any images with an unsupported operating system to avoid a potential
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// panic when indexing through the layerstore. Don't error as we want to list
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// the other images. This should never happen, but here as a safety precaution.
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if !system.IsOSSupported(img.OperatingSystem()) {
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continue
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}
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var size int64
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if layerID := img.RootFS.ChainID(); layerID != "" {
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l, err := i.layerStore.Get(layerID)
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if err != nil {
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// The layer may have been deleted between the call to `Map()` or
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// `Heads()` and the call to `Get()`, so we just ignore this error
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if err == layer.ErrLayerDoesNotExist {
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continue
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}
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return nil, err
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}
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size = l.Size()
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layer.ReleaseAndLog(i.layerStore, l)
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}
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summary := newImageSummary(img, size)
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for _, ref := range i.referenceStore.References(id.Digest()) {
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if opts.Filters.Contains("reference") {
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var found bool
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var matchErr error
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for _, pattern := range opts.Filters.Get("reference") {
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found, matchErr = reference.FamiliarMatch(pattern, ref)
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if matchErr != nil {
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return nil, matchErr
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}
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if found {
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break
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}
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}
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if !found {
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continue
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}
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}
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if _, ok := ref.(reference.Canonical); ok {
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summary.RepoDigests = append(summary.RepoDigests, reference.FamiliarString(ref))
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}
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if _, ok := ref.(reference.NamedTagged); ok {
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summary.RepoTags = append(summary.RepoTags, reference.FamiliarString(ref))
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}
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}
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if summary.RepoDigests == nil && summary.RepoTags == nil {
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if opts.All || len(i.imageStore.Children(id)) == 0 {
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if opts.Filters.Contains("dangling") && !danglingOnly {
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// dangling=false case, so dangling image is not needed
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continue
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}
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if opts.Filters.Contains("reference") { // skip images with no references if filtering by reference
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continue
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}
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summary.RepoDigests = []string{"<none>@<none>"}
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summary.RepoTags = []string{"<none>:<none>"}
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} else {
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continue
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}
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} else if danglingOnly && len(summary.RepoTags) > 0 {
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continue
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}
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if opts.ContainerCount {
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// Lazily init allContainers.
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if allContainers == nil {
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allContainers = i.containers.List()
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}
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// Get container count
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var containers int64
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for _, c := range allContainers {
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if c.ImageID == id {
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containers++
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}
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}
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// NOTE: By default, Containers is -1, or "not set"
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summary.Containers = containers
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}
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if opts.ContainerCount || opts.SharedSize {
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// Lazily init summaryMap.
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if summaryMap == nil {
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summaryMap = make(map[*image.Image]*types.ImageSummary, len(selectedImages))
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}
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summaryMap[img] = summary
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}
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summaries = append(summaries, summary)
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}
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if opts.SharedSize {
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allLayers := i.layerStore.Map()
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layerRefs := make(map[layer.ChainID]int, len(allLayers))
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allImages := selectedImages
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if danglingOnly {
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// If danglingOnly is true, then selectedImages include only dangling images,
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// but we need to consider all existing images to correctly perform reference counting.
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// If danglingOnly is false, selectedImages (and, hence, allImages) is already equal to i.imageStore.Map()
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// and we can avoid performing an otherwise redundant method call.
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allImages = i.imageStore.Map()
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}
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// Count layer references across all known images
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for _, img := range allImages {
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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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layerRefs[rootFS.ChainID()]++
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}
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}
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// Get Shared sizes
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for img, summary := range summaryMap {
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rootFS := *img.RootFS
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rootFS.DiffIDs = nil
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// Indicate that we collected shared size information (default is -1, or "not set")
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summary.SharedSize = 0
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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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if layerRefs[chid] > 1 {
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if _, ok := allLayers[chid]; !ok {
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return nil, fmt.Errorf("layer %v was not found (corruption?)", chid)
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}
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summary.SharedSize += allLayers[chid].DiffSize()
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}
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}
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}
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}
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sort.Sort(sort.Reverse(byCreated(summaries)))
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return summaries, nil
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}
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// SquashImage creates a new image with the diff of the specified image and the specified parent.
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// This new image contains only the layers from it's parent + 1 extra layer which contains the diff of all the layers in between.
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// The existing image(s) is not destroyed.
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// 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.
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func (i *ImageService) SquashImage(id, parent string) (string, error) {
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var (
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img *image.Image
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err error
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)
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if img, err = i.imageStore.Get(image.ID(id)); err != nil {
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return "", err
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}
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var parentImg *image.Image
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var parentChainID layer.ChainID
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if len(parent) != 0 {
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parentImg, err = i.imageStore.Get(image.ID(parent))
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if err != nil {
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return "", errors.Wrap(err, "error getting specified parent layer")
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}
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parentChainID = parentImg.RootFS.ChainID()
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} else {
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rootFS := image.NewRootFS()
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parentImg = &image.Image{RootFS: rootFS}
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}
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l, err := i.layerStore.Get(img.RootFS.ChainID())
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if err != nil {
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return "", errors.Wrap(err, "error getting image layer")
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}
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defer i.layerStore.Release(l)
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ts, err := l.TarStreamFrom(parentChainID)
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if err != nil {
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return "", errors.Wrapf(err, "error getting tar stream to parent")
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}
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defer ts.Close()
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newL, err := i.layerStore.Register(ts, parentChainID)
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if err != nil {
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return "", errors.Wrap(err, "error registering layer")
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}
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defer i.layerStore.Release(newL)
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newImage := *img
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newImage.RootFS = nil
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rootFS := *parentImg.RootFS
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rootFS.DiffIDs = append(rootFS.DiffIDs, newL.DiffID())
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newImage.RootFS = &rootFS
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for i, hi := range newImage.History {
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if i >= len(parentImg.History) {
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hi.EmptyLayer = true
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}
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newImage.History[i] = hi
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}
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now := time.Now()
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var historyComment string
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if len(parent) > 0 {
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historyComment = fmt.Sprintf("merge %s to %s", id, parent)
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} else {
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historyComment = fmt.Sprintf("create new from %s", id)
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}
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newImage.History = append(newImage.History, image.History{
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Created: now,
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Comment: historyComment,
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})
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newImage.Created = now
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b, err := json.Marshal(&newImage)
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if err != nil {
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return "", errors.Wrap(err, "error marshalling image config")
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}
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newImgID, err := i.imageStore.Create(b)
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if err != nil {
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return "", errors.Wrap(err, "error creating new image after squash")
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}
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return string(newImgID), nil
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}
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func newImageSummary(image *image.Image, size int64) *types.ImageSummary {
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summary := &types.ImageSummary{
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ParentID: image.Parent.String(),
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ID: image.ID().String(),
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Created: image.Created.Unix(),
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Size: size,
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VirtualSize: size,
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// -1 indicates that the value has not been set (avoids ambiguity
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// between 0 (default) and "not set". We cannot use a pointer (nil)
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// for this, as the JSON representation uses "omitempty", which would
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// consider both "0" and "nil" to be "empty".
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SharedSize: -1,
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Containers: -1,
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}
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if image.Config != nil {
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summary.Labels = image.Config.Labels
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}
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return summary
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}
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