157 lines
3.9 KiB
Go
157 lines
3.9 KiB
Go
package blobs
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import (
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"context"
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"time"
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"github.com/containerd/containerd/content"
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"github.com/containerd/containerd/diff"
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"github.com/containerd/containerd/mount"
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"github.com/moby/buildkit/cache"
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"github.com/moby/buildkit/snapshot"
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"github.com/moby/buildkit/util/flightcontrol"
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"github.com/moby/buildkit/util/winlayers"
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digest "github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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"golang.org/x/sync/errgroup"
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)
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var g flightcontrol.Group
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const containerdUncompressed = "containerd.io/uncompressed"
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type DiffPair struct {
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DiffID digest.Digest
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Blobsum digest.Digest
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}
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var ErrNoBlobs = errors.Errorf("no blobs for snapshot")
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func GetDiffPairs(ctx context.Context, contentStore content.Store, snapshotter snapshot.Snapshotter, differ diff.Comparer, ref cache.ImmutableRef, createBlobs bool) ([]DiffPair, error) {
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if ref == nil {
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return nil, nil
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}
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if err := ref.Finalize(ctx, true); err != nil {
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return nil, err
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}
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if isTypeWindows(ref) {
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ctx = winlayers.UseWindowsLayerMode(ctx)
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}
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return getDiffPairs(ctx, contentStore, snapshotter, differ, ref, createBlobs)
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}
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func getDiffPairs(ctx context.Context, contentStore content.Store, snapshotter snapshot.Snapshotter, differ diff.Comparer, ref cache.ImmutableRef, createBlobs bool) ([]DiffPair, error) {
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if ref == nil {
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return nil, nil
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}
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eg, ctx := errgroup.WithContext(ctx)
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var diffPairs []DiffPair
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var currentPair DiffPair
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parent := ref.Parent()
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if parent != nil {
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defer parent.Release(context.TODO())
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eg.Go(func() error {
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dp, err := getDiffPairs(ctx, contentStore, snapshotter, differ, parent, createBlobs)
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if err != nil {
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return err
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}
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diffPairs = dp
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return nil
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})
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}
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eg.Go(func() error {
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dp, err := g.Do(ctx, ref.ID(), func(ctx context.Context) (interface{}, error) {
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diffID, blob, err := snapshotter.GetBlob(ctx, ref.ID())
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if err != nil {
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return nil, err
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}
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if blob != "" {
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return DiffPair{DiffID: diffID, Blobsum: blob}, nil
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} else if !createBlobs {
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return nil, errors.WithStack(ErrNoBlobs)
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}
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// reference needs to be committed
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parent := ref.Parent()
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var lower []mount.Mount
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var release func() error
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if parent != nil {
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defer parent.Release(context.TODO())
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m, err := parent.Mount(ctx, true)
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if err != nil {
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return nil, err
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}
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lower, release, err = m.Mount()
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if err != nil {
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return nil, err
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}
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if release != nil {
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defer release()
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}
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}
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m, err := ref.Mount(ctx, true)
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if err != nil {
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return nil, err
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}
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upper, release, err := m.Mount()
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if err != nil {
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return nil, err
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}
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if release != nil {
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defer release()
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}
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descr, err := differ.Compare(ctx, lower, upper,
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diff.WithMediaType(ocispec.MediaTypeImageLayerGzip),
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diff.WithReference(ref.ID()),
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diff.WithLabels(map[string]string{
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"containerd.io/gc.root": time.Now().UTC().Format(time.RFC3339Nano),
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}),
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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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info, err := contentStore.Info(ctx, descr.Digest)
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if err != nil {
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return nil, err
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}
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diffIDStr, ok := info.Labels[containerdUncompressed]
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if !ok {
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return nil, errors.Errorf("invalid differ response with no diffID: %v", descr.Digest)
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}
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diffIDDigest, err := digest.Parse(diffIDStr)
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if err != nil {
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return nil, err
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}
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if err := snapshotter.SetBlob(ctx, ref.ID(), diffIDDigest, descr.Digest); err != nil {
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return nil, err
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}
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return DiffPair{DiffID: diffIDDigest, Blobsum: descr.Digest}, nil
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})
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if err != nil {
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return err
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}
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currentPair = dp.(DiffPair)
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return nil
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})
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err := eg.Wait()
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if err != nil {
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return nil, err
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}
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return append(diffPairs, currentPair), nil
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}
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func isTypeWindows(ref cache.ImmutableRef) bool {
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if cache.GetLayerType(ref) == "windows" {
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return true
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}
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if parent := ref.Parent(); parent != nil {
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defer parent.Release(context.TODO())
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return isTypeWindows(parent)
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}
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return false
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}
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