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image_list.go
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image_list.go
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package containerd
import (
"context"
"encoding/json"
"strings"
"time"
"github.com/containerd/containerd/content"
cerrdefs "github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/labels"
"github.com/containerd/containerd/snapshots"
"github.com/docker/distribution/reference"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
timetypes "github.com/docker/docker/api/types/time"
"github.com/docker/docker/errdefs"
"github.com/opencontainers/go-digest"
"github.com/opencontainers/image-spec/identity"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
var acceptedImageFilterTags = map[string]bool{
"dangling": true,
"label": true,
"label!": true,
"before": true,
"since": true,
"reference": true,
"until": true,
}
// Images returns a filtered list of images.
//
// TODO(thaJeztah): sort the results by created (descending); see https://github.com/moby/moby/issues/43848
// TODO(thaJeztah): implement opts.ContainerCount (used for docker system df); see https://github.com/moby/moby/issues/43853
// TODO(thaJeztah): add labels to results; see https://github.com/moby/moby/issues/43852
// TODO(thaJeztah): verify behavior of `RepoDigests` and `RepoTags` for images without (untagged) or multiple tags; see https://github.com/moby/moby/issues/43861
// TODO(thaJeztah): verify "Size" vs "VirtualSize" in images; see https://github.com/moby/moby/issues/43862
func (i *ImageService) Images(ctx context.Context, opts types.ImageListOptions) ([]*types.ImageSummary, error) {
if err := opts.Filters.Validate(acceptedImageFilterTags); err != nil {
return nil, err
}
listFilters, filter, err := i.setupFilters(ctx, opts.Filters)
if err != nil {
return nil, err
}
imgs, err := i.client.ImageService().List(ctx, listFilters...)
if err != nil {
return nil, err
}
// TODO(thaJeztah): do we need to take multiple snapshotters into account? See https://github.com/moby/moby/issues/45273
snapshotter := i.client.SnapshotService(i.snapshotter)
sizeCache := make(map[digest.Digest]int64)
snapshotSizeFn := func(d digest.Digest) (int64, error) {
if s, ok := sizeCache[d]; ok {
return s, nil
}
usage, err := snapshotter.Usage(ctx, d.String())
if err != nil {
return 0, err
}
sizeCache[d] = usage.Size
return usage.Size, nil
}
var (
summaries = make([]*types.ImageSummary, 0, len(imgs))
root []*[]digest.Digest
layers map[digest.Digest]int
)
if opts.SharedSize {
root = make([]*[]digest.Digest, 0, len(imgs))
layers = make(map[digest.Digest]int)
}
contentStore := i.client.ContentStore()
for _, img := range imgs {
if !filter(img) {
continue
}
err := i.walkImageManifests(ctx, img, func(img *ImageManifest) error {
if isPseudo, err := img.IsPseudoImage(ctx); isPseudo || err != nil {
return err
}
available, err := img.CheckContentAvailable(ctx)
if err != nil {
logrus.WithFields(logrus.Fields{
logrus.ErrorKey: err,
"manifest": img.Target(),
"image": img.Name(),
}).Warn("checking availability of platform specific manifest failed")
return nil
}
if !available {
return nil
}
image, chainIDs, err := i.singlePlatformImage(ctx, contentStore, img)
if err != nil {
return err
}
summaries = append(summaries, image)
if opts.SharedSize {
root = append(root, &chainIDs)
for _, id := range chainIDs {
layers[id] = layers[id] + 1
}
}
return nil
})
if err != nil {
return nil, err
}
}
if opts.SharedSize {
for n, chainIDs := range root {
sharedSize, err := computeSharedSize(*chainIDs, layers, snapshotSizeFn)
if err != nil {
return nil, err
}
summaries[n].SharedSize = sharedSize
}
}
return summaries, nil
}
func (i *ImageService) singlePlatformImage(ctx context.Context, contentStore content.Store, image *ImageManifest) (*types.ImageSummary, []digest.Digest, error) {
diffIDs, err := image.RootFS(ctx)
if err != nil {
return nil, nil, errors.Wrapf(err, "failed to get rootfs of image %s", image.Name())
}
// TODO(thaJeztah): do we need to take multiple snapshotters into account? See https://github.com/moby/moby/issues/45273
snapshotter := i.client.SnapshotService(i.snapshotter)
imageSnapshotID := identity.ChainID(diffIDs).String()
unpackedUsage, err := calculateSnapshotTotalUsage(ctx, snapshotter, imageSnapshotID)
if err != nil {
if !cerrdefs.IsNotFound(err) {
logrus.WithError(err).WithFields(logrus.Fields{
"image": image.Name(),
"snapshotID": imageSnapshotID,
}).Warn("failed to calculate unpacked size of image")
}
unpackedUsage = snapshots.Usage{Size: 0}
}
contentSize, err := image.Size(ctx)
if err != nil {
return nil, nil, err
}
// totalSize is the size of the image's packed layers and snapshots
// (unpacked layers) combined.
totalSize := contentSize + unpackedUsage.Size
var repoTags, repoDigests []string
rawImg := image.Metadata()
target := rawImg.Target.Digest
logger := logrus.WithFields(logrus.Fields{
"name": rawImg.Name,
"digest": target,
})
ref, err := reference.ParseNamed(rawImg.Name)
if err != nil {
// If the image has unexpected name format (not a Named reference or a dangling image)
// add the offending name to RepoTags but also log an error to make it clear to the
// administrator that this is unexpected.
// TODO: Reconsider when containerd is more strict on image names, see:
// https://github.com/containerd/containerd/issues/7986
if !isDanglingImage(rawImg) {
logger.WithError(err).Error("failed to parse image name as reference")
repoTags = append(repoTags, rawImg.Name)
}
} else {
repoTags = append(repoTags, reference.TagNameOnly(ref).String())
digested, err := reference.WithDigest(reference.TrimNamed(ref), target)
if err != nil {
logger.WithError(err).Error("failed to create digested reference")
} else {
repoDigests = append(repoDigests, digested.String())
}
}
summary := &types.ImageSummary{
ParentID: "",
ID: target.String(),
Created: rawImg.CreatedAt.Unix(),
RepoDigests: repoDigests,
RepoTags: repoTags,
Size: totalSize,
VirtualSize: totalSize, //nolint:staticcheck // ignore SA1019: field is deprecated, but still set on API < v1.44.
// -1 indicates that the value has not been set (avoids ambiguity
// between 0 (default) and "not set". We cannot use a pointer (nil)
// for this, as the JSON representation uses "omitempty", which would
// consider both "0" and "nil" to be "empty".
SharedSize: -1,
Containers: -1,
}
return summary, identity.ChainIDs(diffIDs), nil
}
type imageFilterFunc func(image images.Image) bool
// setupFilters constructs an imageFilterFunc from the given imageFilters.
//
// containerdListFilters is a slice of filters which should be passed to ImageService.List()
// filterFunc is a function that checks whether given image matches the filters.
// TODO(thaJeztah): reimplement filters using containerd filters: see https://github.com/moby/moby/issues/43845
func (i *ImageService) setupFilters(ctx context.Context, imageFilters filters.Args) (
containerdListFilters []string, filterFunc imageFilterFunc, outErr error) {
var fltrs []imageFilterFunc
err := imageFilters.WalkValues("before", func(value string) error {
ref, err := reference.ParseDockerRef(value)
if err != nil {
return err
}
img, err := i.client.GetImage(ctx, ref.String())
if img != nil {
t := img.Metadata().CreatedAt
fltrs = append(fltrs, func(image images.Image) bool {
created := image.CreatedAt
return created.Equal(t) || created.After(t)
})
}
return err
})
if err != nil {
return nil, nil, err
}
err = imageFilters.WalkValues("since", func(value string) error {
ref, err := reference.ParseDockerRef(value)
if err != nil {
return err
}
img, err := i.client.GetImage(ctx, ref.String())
if img != nil {
t := img.Metadata().CreatedAt
fltrs = append(fltrs, func(image images.Image) bool {
created := image.CreatedAt
return created.Equal(t) || created.Before(t)
})
}
return err
})
if err != nil {
return nil, nil, err
}
err = imageFilters.WalkValues("until", func(value string) error {
ts, err := timetypes.GetTimestamp(value, time.Now())
if err != nil {
return err
}
seconds, nanoseconds, err := timetypes.ParseTimestamps(ts, 0)
if err != nil {
return err
}
until := time.Unix(seconds, nanoseconds)
fltrs = append(fltrs, func(image images.Image) bool {
created := image.CreatedAt
return created.Before(until)
})
return err
})
if err != nil {
return nil, nil, err
}
labelFn, err := setupLabelFilter(i.client.ContentStore(), imageFilters)
if err != nil {
return nil, nil, err
}
if labelFn != nil {
fltrs = append(fltrs, labelFn)
}
if imageFilters.Contains("dangling") {
danglingValue, err := imageFilters.GetBoolOrDefault("dangling", false)
if err != nil {
return nil, nil, err
}
fltrs = append(fltrs, func(image images.Image) bool {
return danglingValue == isDanglingImage(image)
})
}
var listFilters []string
err = imageFilters.WalkValues("reference", func(value string) error {
ref, err := reference.ParseNormalizedNamed(value)
if err != nil {
return err
}
ref = reference.TagNameOnly(ref)
listFilters = append(listFilters, "name=="+ref.String())
return nil
})
if err != nil {
return nil, nil, err
}
return listFilters, func(image images.Image) bool {
for _, filter := range fltrs {
if !filter(image) {
return false
}
}
return true
}, nil
}
// setupLabelFilter parses filter args for "label" and "label!" and returns a
// filter func which will check if any image config from the given image has
// labels that match given predicates.
func setupLabelFilter(store content.Store, fltrs filters.Args) (func(image images.Image) bool, error) {
type labelCheck struct {
key string
value string
onlyExists bool
negate bool
}
var checks []labelCheck
for _, fltrName := range []string{"label", "label!"} {
for _, l := range fltrs.Get(fltrName) {
k, v, found := strings.Cut(l, "=")
err := labels.Validate(k, v)
if err != nil {
return nil, err
}
negate := strings.HasSuffix(fltrName, "!")
// If filter value is key!=value then flip the above.
if strings.HasSuffix(k, "!") {
k = strings.TrimSuffix(k, "!")
negate = !negate
}
checks = append(checks, labelCheck{
key: k,
value: v,
onlyExists: !found,
negate: negate,
})
}
}
return func(image images.Image) bool {
ctx := context.TODO()
// This is not an error, but a signal to Dispatch that it should stop
// processing more content (otherwise it will run for all children).
// It will be returned once a matching config is found.
errFoundConfig := errors.New("success, found matching config")
err := images.Dispatch(ctx, presentChildrenHandler(store, images.HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) (subdescs []ocispec.Descriptor, err error) {
if !images.IsConfigType(desc.MediaType) {
return nil, nil
}
// Subset of ocispec.Image that only contains Labels
var cfg struct {
Config struct {
Labels map[string]string `json:"Labels,omitempty"`
} `json:"Config,omitempty"`
}
if err := readConfig(ctx, store, desc, &cfg); err != nil {
return nil, err
}
for _, check := range checks {
value, exists := cfg.Config.Labels[check.key]
if check.onlyExists {
// label! given without value, check if doesn't exist
if check.negate {
// Label exists, config doesn't match
if exists {
return nil, nil
}
} else {
// Label should exist
if !exists {
// Label doesn't exist, config doesn't match
return nil, nil
}
}
continue
} else if !exists {
// We are checking value and label doesn't exist.
return nil, nil
}
valueEquals := value == check.value
if valueEquals == check.negate {
return nil, nil
}
}
// This config matches the filter so we need to shop this image, stop dispatch.
return nil, errFoundConfig
})), nil, image.Target)
if err == errFoundConfig {
return true
}
if err != nil {
logrus.WithFields(logrus.Fields{
logrus.ErrorKey: err,
"image": image.Name,
"checks": checks,
}).Error("failed to check image labels")
}
return false
}, nil
}
func computeSharedSize(chainIDs []digest.Digest, layers map[digest.Digest]int, sizeFn func(d digest.Digest) (int64, error)) (int64, error) {
var sharedSize int64
for _, chainID := range chainIDs {
if layers[chainID] == 1 {
continue
}
size, err := sizeFn(chainID)
if err != nil {
return 0, err
}
sharedSize += size
}
return sharedSize, nil
}
// readConfig reads content pointed by the descriptor and unmarshals it into a specified output.
func readConfig(ctx context.Context, store content.Provider, desc ocispec.Descriptor, out interface{}) error {
data, err := content.ReadBlob(ctx, store, desc)
if err != nil {
err = errors.Wrapf(err, "failed to read config content")
if cerrdefs.IsNotFound(err) {
return errdefs.NotFound(err)
}
return err
}
err = json.Unmarshal(data, out)
if err != nil {
err = errors.Wrapf(err, "could not deserialize image config")
if cerrdefs.IsNotFound(err) {
return errdefs.NotFound(err)
}
return err
}
return nil
}