/
cache.go
227 lines (193 loc) · 6.11 KB
/
cache.go
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package containerd
import (
"context"
"encoding/json"
"errors"
"fmt"
"github.com/containerd/containerd/content"
cerrdefs "github.com/containerd/containerd/errdefs"
"github.com/containerd/log"
"github.com/docker/docker/api/types/backend"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/builder"
"github.com/docker/docker/errdefs"
"github.com/docker/docker/image"
"github.com/docker/docker/image/cache"
"github.com/docker/docker/internal/multierror"
"github.com/docker/docker/layer"
"github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
)
// MakeImageCache creates a stateful image cache.
func (i *ImageService) MakeImageCache(ctx context.Context, sourceRefs []string) (builder.ImageCache, error) {
return cache.New(ctx, cacheAdaptor{i}, sourceRefs)
}
type cacheAdaptor struct {
is *ImageService
}
func (c cacheAdaptor) Get(id image.ID) (*image.Image, error) {
ctx := context.TODO()
ref := id.String()
outImg, err := c.is.GetImage(ctx, id.String(), backend.GetImageOpts{})
if err != nil {
return nil, fmt.Errorf("GetImage: %w", err)
}
c8dImg, err := c.is.resolveImage(ctx, ref)
if err != nil {
return nil, fmt.Errorf("resolveImage: %w", err)
}
var errFound = errors.New("success")
err = c.is.walkImageManifests(ctx, c8dImg, func(img *ImageManifest) error {
desc, err := img.Config(ctx)
if err != nil {
log.G(ctx).WithFields(log.Fields{
"image": img,
"error": err,
}).Warn("failed to get config descriptor for image")
return nil
}
info, err := c.is.content.Info(ctx, desc.Digest)
if err != nil {
if !cerrdefs.IsNotFound(err) {
log.G(ctx).WithFields(log.Fields{
"image": img,
"desc": desc,
"error": err,
}).Warn("failed to get info of image config")
}
return nil
}
if dgstStr, ok := info.Labels[contentLabelGcRefContainerConfig]; ok {
dgst, err := digest.Parse(dgstStr)
if err != nil {
log.G(ctx).WithFields(log.Fields{
"label": contentLabelClassicBuilderImage,
"value": dgstStr,
"content": desc.Digest,
"error": err,
}).Warn("invalid digest in label")
return nil
}
configDesc := ocispec.Descriptor{
Digest: dgst,
}
var config container.Config
if err := readConfig(ctx, c.is.content, configDesc, &config); err != nil {
if !errdefs.IsNotFound(err) {
log.G(ctx).WithFields(log.Fields{
"configDigest": dgst,
"error": err,
}).Warn("failed to read container config")
}
return nil
}
outImg.ContainerConfig = config
// We already have the config we looked for, so return an error to
// stop walking the image further. This error will be ignored.
return errFound
}
return nil
})
if err != nil && err != errFound {
return nil, err
}
return outImg, nil
}
func (c cacheAdaptor) GetByRef(ctx context.Context, refOrId string) (*image.Image, error) {
return c.is.GetImage(ctx, refOrId, backend.GetImageOpts{})
}
func (c cacheAdaptor) SetParent(target, parent image.ID) error {
ctx := context.TODO()
_, imgs, err := c.is.resolveAllReferences(ctx, target.String())
if err != nil {
return fmt.Errorf("failed to list images with digest %q", target)
}
var errs []error
is := c.is.images
for _, img := range imgs {
if img.Labels == nil {
img.Labels = make(map[string]string)
}
img.Labels[imageLabelClassicBuilderParent] = parent.String()
if _, err := is.Update(ctx, img, "labels."+imageLabelClassicBuilderParent); err != nil {
errs = append(errs, fmt.Errorf("failed to update parent label on image %v: %w", img, err))
}
}
return multierror.Join(errs...)
}
func (c cacheAdaptor) GetParent(target image.ID) (image.ID, error) {
ctx := context.TODO()
value, err := c.is.getImageLabelByDigest(ctx, target.Digest(), imageLabelClassicBuilderParent)
if err != nil {
return "", fmt.Errorf("failed to read parent image: %w", err)
}
dgst, err := digest.Parse(value)
if err != nil {
return "", fmt.Errorf("invalid parent value: %q", value)
}
return image.ID(dgst), nil
}
func (c cacheAdaptor) Create(parent *image.Image, target image.Image, extraLayer layer.DiffID) (image.ID, error) {
ctx := context.TODO()
data, err := json.Marshal(target)
if err != nil {
return "", fmt.Errorf("failed to marshal image config: %w", err)
}
var layerDigest digest.Digest
if extraLayer != "" {
info, err := findContentByUncompressedDigest(ctx, c.is.client.ContentStore(), digest.Digest(extraLayer))
if err != nil {
return "", fmt.Errorf("failed to find content for diff ID %q: %w", extraLayer, err)
}
layerDigest = info.Digest
}
var parentRef string
if parent != nil {
parentRef = parent.ID().String()
}
img, err := c.is.CreateImage(ctx, data, parentRef, layerDigest)
if err != nil {
return "", fmt.Errorf("failed to created cached image: %w", err)
}
return image.ID(img.ImageID()), nil
}
func (c cacheAdaptor) IsBuiltLocally(target image.ID) (bool, error) {
ctx := context.TODO()
value, err := c.is.getImageLabelByDigest(ctx, target.Digest(), imageLabelClassicBuilderContainerConfig)
if err != nil {
return false, fmt.Errorf("failed to read container config label: %w", err)
}
return value != "", nil
}
func (c cacheAdaptor) Children(id image.ID) []image.ID {
ctx := context.TODO()
if id.String() == "" {
imgs, err := c.is.getImagesWithLabel(ctx, imageLabelClassicBuilderFromScratch, "1")
if err != nil {
log.G(ctx).WithError(err).Error("failed to get from scratch images")
return nil
}
return imgs
}
imgs, err := c.is.Children(ctx, id)
if err != nil {
log.G(ctx).WithError(err).Error("failed to get image children")
return nil
}
return imgs
}
func findContentByUncompressedDigest(ctx context.Context, cs content.Manager, uncompressed digest.Digest) (content.Info, error) {
var out content.Info
errStopWalk := errors.New("success")
err := cs.Walk(ctx, func(i content.Info) error {
out = i
return errStopWalk
}, `labels."containerd.io/uncompressed"==`+uncompressed.String())
if err != nil && err != errStopWalk {
return out, err
}
if out.Digest == "" {
return out, errdefs.NotFound(errors.New("no content matches this uncompressed digest"))
}
return out, nil
}