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image.go
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image.go
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package containerd
import (
"context"
"fmt"
"regexp"
"sort"
"strconv"
"sync/atomic"
"time"
cerrdefs "github.com/containerd/containerd/errdefs"
containerdimages "github.com/containerd/containerd/images"
cplatforms "github.com/containerd/containerd/platforms"
"github.com/docker/distribution/reference"
containertypes "github.com/docker/docker/api/types/container"
imagetype "github.com/docker/docker/api/types/image"
"github.com/docker/docker/daemon/images"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/image"
"github.com/docker/docker/layer"
"github.com/docker/docker/pkg/platforms"
"github.com/docker/go-connections/nat"
"github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"golang.org/x/sync/semaphore"
)
var truncatedID = regexp.MustCompile(`^([a-f0-9]{4,64})$`)
// GetImage returns an image corresponding to the image referred to by refOrID.
func (i *ImageService) GetImage(ctx context.Context, refOrID string, options imagetype.GetImageOpts) (*image.Image, error) {
desc, err := i.resolveImage(ctx, refOrID)
if err != nil {
return nil, err
}
platform := platforms.AllPlatformsWithPreference(cplatforms.Default())
if options.Platform != nil {
platform = cplatforms.OnlyStrict(*options.Platform)
}
cs := i.client.ContentStore()
var presentImages []ocispec.Image
err = i.walkImageManifests(ctx, desc, func(img *ImageManifest) error {
conf, err := img.Config(ctx)
if err != nil {
return fmt.Errorf("failed to get config descriptor: %w", err)
}
var ociimage ocispec.Image
if err := readConfig(ctx, cs, conf, &ociimage); err != nil {
if cerrdefs.IsNotFound(err) {
log.G(ctx).WithFields(log.Fields{
"manifestDescriptor": img.Target(),
"configDescriptor": conf,
}).Debug("manifest present, but its config is missing, ignoring")
return nil
}
return fmt.Errorf("failed to read config of the manifest %v: %w", img.Target().Digest, err)
}
presentImages = append(presentImages, ociimage)
return nil
})
if err != nil {
return nil, err
}
if len(presentImages) == 0 {
ref, _ := reference.ParseAnyReference(refOrID)
return nil, images.ErrImageDoesNotExist{Ref: ref}
}
sort.SliceStable(presentImages, func(i, j int) bool {
return platform.Less(presentImages[i].Platform, presentImages[j].Platform)
})
ociimage := presentImages[0]
rootfs := image.NewRootFS()
for _, id := range ociimage.RootFS.DiffIDs {
rootfs.Append(layer.DiffID(id))
}
exposedPorts := make(nat.PortSet, len(ociimage.Config.ExposedPorts))
for k, v := range ociimage.Config.ExposedPorts {
exposedPorts[nat.Port(k)] = v
}
derefTimeSafely := func(t *time.Time) time.Time {
if t != nil {
return *t
}
return time.Time{}
}
var imgHistory []image.History
for _, h := range ociimage.History {
imgHistory = append(imgHistory, image.History{
Created: derefTimeSafely(h.Created),
Author: h.Author,
CreatedBy: h.CreatedBy,
Comment: h.Comment,
EmptyLayer: h.EmptyLayer,
})
}
img := image.NewImage(image.ID(desc.Target.Digest))
img.V1Image = image.V1Image{
ID: string(desc.Target.Digest),
OS: ociimage.OS,
Architecture: ociimage.Architecture,
Created: derefTimeSafely(ociimage.Created),
Variant: ociimage.Variant,
Config: &containertypes.Config{
Entrypoint: ociimage.Config.Entrypoint,
Env: ociimage.Config.Env,
Cmd: ociimage.Config.Cmd,
User: ociimage.Config.User,
WorkingDir: ociimage.Config.WorkingDir,
ExposedPorts: exposedPorts,
Volumes: ociimage.Config.Volumes,
Labels: ociimage.Config.Labels,
StopSignal: ociimage.Config.StopSignal,
},
}
img.RootFS = rootfs
img.History = imgHistory
if options.Details {
lastUpdated := time.Unix(0, 0)
size, err := i.size(ctx, desc.Target, platform)
if err != nil {
return nil, err
}
tagged, err := i.client.ImageService().List(ctx, "target.digest=="+desc.Target.Digest.String())
if err != nil {
return nil, err
}
// Usually each image will result in 2 references (named and digested).
refs := make([]reference.Named, 0, len(tagged)*2)
for _, i := range tagged {
if i.UpdatedAt.After(lastUpdated) {
lastUpdated = i.UpdatedAt
}
if isDanglingImage(i) {
if len(tagged) > 1 {
// This is unexpected - dangling image should be deleted
// as soon as another image with the same target is created.
// Log a warning, but don't error out the whole operation.
logrus.WithField("refs", tagged).Warn("multiple images have the same target, but one of them is still dangling")
}
continue
}
name, err := reference.ParseNamed(i.Name)
if err != nil {
// This is inconsistent with `docker image ls` which will
// still include the malformed name in RepoTags.
logrus.WithField("name", name).WithError(err).Error("failed to parse image name as reference")
continue
}
refs = append(refs, name)
if _, ok := name.(reference.Digested); ok {
// Image name already contains a digest, so no need to create a digested reference.
continue
}
digested, err := reference.WithDigest(reference.TrimNamed(name), desc.Target.Digest)
if err != nil {
// This could only happen if digest is invalid, but considering that
// we get it from the Descriptor it's highly unlikely.
// Log error just in case.
logrus.WithError(err).Error("failed to create digested reference")
continue
}
refs = append(refs, digested)
}
img.Details = &image.Details{
References: refs,
Size: size,
Metadata: nil,
Driver: i.snapshotter,
LastUpdated: lastUpdated,
}
}
return img, nil
}
func (i *ImageService) GetImageManifest(ctx context.Context, refOrID string, options imagetype.GetImageOpts) (*ocispec.Descriptor, error) {
cs := i.client.ContentStore()
desc, err := i.resolveDescriptor(ctx, refOrID)
if err != nil {
return nil, err
}
if containerdimages.IsManifestType(desc.MediaType) {
return &desc, nil
}
if containerdimages.IsIndexType(desc.MediaType) {
platform := platforms.AllPlatformsWithPreference(cplatforms.Default())
if options.Platform != nil {
platform = cplatforms.Only(*options.Platform)
}
childManifests, err := containerdimages.LimitManifests(containerdimages.ChildrenHandler(cs), platform, 1)(ctx, desc)
if err != nil {
if cerrdefs.IsNotFound(err) {
return nil, errdefs.NotFound(err)
}
return nil, errdefs.System(err)
}
// len(childManifests) == 1 since we requested 1 and if none
// were found LimitManifests would have thrown an error
if !containerdimages.IsManifestType(childManifests[0].MediaType) {
return nil, errdefs.NotFound(fmt.Errorf("manifest has incorrect mediatype: %s", childManifests[0].MediaType))
}
return &childManifests[0], nil
}
return nil, errdefs.NotFound(errors.New("failed to find manifest"))
}
// size returns the total size of the image's packed resources.
func (i *ImageService) size(ctx context.Context, desc ocispec.Descriptor, platform cplatforms.MatchComparer) (int64, error) {
var size int64
cs := i.client.ContentStore()
handler := containerdimages.LimitManifests(containerdimages.ChildrenHandler(cs), platform, 1)
var wh containerdimages.HandlerFunc = func(ctx context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
children, err := handler(ctx, desc)
if err != nil {
if !cerrdefs.IsNotFound(err) {
return nil, err
}
}
atomic.AddInt64(&size, desc.Size)
return children, nil
}
l := semaphore.NewWeighted(3)
if err := containerdimages.Dispatch(ctx, wh, l, desc); err != nil {
return 0, err
}
return size, nil
}
// resolveDescriptor searches for a descriptor based on the given
// reference or identifier. Returns the descriptor of
// the image, which could be a manifest list, manifest, or config.
func (i *ImageService) resolveDescriptor(ctx context.Context, refOrID string) (ocispec.Descriptor, error) {
img, err := i.resolveImage(ctx, refOrID)
if err != nil {
return ocispec.Descriptor{}, err
}
return img.Target, nil
}
func (i *ImageService) resolveImage(ctx context.Context, refOrID string) (containerdimages.Image, error) {
parsed, err := reference.ParseAnyReference(refOrID)
if err != nil {
return containerdimages.Image{}, errdefs.InvalidParameter(err)
}
is := i.client.ImageService()
digested, ok := parsed.(reference.Digested)
if ok {
imgs, err := is.List(ctx, "target.digest=="+digested.Digest().String())
if err != nil {
return containerdimages.Image{}, errors.Wrap(err, "failed to lookup digest")
}
if len(imgs) == 0 {
return containerdimages.Image{}, images.ErrImageDoesNotExist{Ref: parsed}
}
// If reference is both Named and Digested, make sure we don't match
// images with a different repository even if digest matches.
// For example, busybox@sha256:abcdef..., shouldn't match asdf@sha256:abcdef...
if parsedNamed, ok := parsed.(reference.Named); ok {
for _, img := range imgs {
imgNamed, err := reference.ParseNormalizedNamed(img.Name)
if err != nil {
logrus.WithError(err).WithField("image", img.Name).Warn("image with invalid name encountered")
continue
}
if parsedNamed.Name() == imgNamed.Name() {
return img, nil
}
}
return containerdimages.Image{}, images.ErrImageDoesNotExist{Ref: parsed}
}
return imgs[0], nil
}
ref := reference.TagNameOnly(parsed.(reference.Named)).String()
img, err := is.Get(ctx, ref)
if err == nil {
return img, nil
} else {
// TODO(containerd): error translation can use common function
if !cerrdefs.IsNotFound(err) {
return containerdimages.Image{}, err
}
}
// If the identifier could be a short ID, attempt to match
if truncatedID.MatchString(refOrID) {
filters := []string{
fmt.Sprintf("name==%q", ref), // Or it could just look like one.
"target.digest~=" + strconv.Quote(fmt.Sprintf(`^sha256:%s[0-9a-fA-F]{%d}$`, regexp.QuoteMeta(refOrID), 64-len(refOrID))),
}
imgs, err := is.List(ctx, filters...)
if err != nil {
return containerdimages.Image{}, err
}
if len(imgs) == 0 {
return containerdimages.Image{}, images.ErrImageDoesNotExist{Ref: parsed}
}
if len(imgs) > 1 {
digests := map[digest.Digest]struct{}{}
for _, img := range imgs {
if img.Name == ref {
return img, nil
}
digests[img.Target.Digest] = struct{}{}
}
if len(digests) > 1 {
return containerdimages.Image{}, errdefs.NotFound(errors.New("ambiguous reference"))
}
}
return imgs[0], nil
}
return containerdimages.Image{}, images.ErrImageDoesNotExist{Ref: parsed}
}