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//go:build nydus
// +build nydus
package winlayers
import (
"context"
"io"
"github.com/containerd/containerd/archive"
"github.com/containerd/containerd/diff"
"github.com/containerd/containerd/mount"
digest "github.com/opencontainers/go-digest"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
nydusify "github.com/containerd/nydus-snapshotter/pkg/converter"
)
func isNydusBlob(ctx context.Context, desc ocispecs.Descriptor) bool {
if desc.Annotations == nil {
return false
}
hasMediaType := desc.MediaType == nydusify.MediaTypeNydusBlob
_, hasAnno := desc.Annotations[nydusify.LayerAnnotationNydusBlob]
return hasMediaType && hasAnno
}
func (s *winApplier) apply(ctx context.Context, desc ocispecs.Descriptor, mounts []mount.Mount, opts ...diff.ApplyOpt) (d ocispecs.Descriptor, err error) {
if !isNydusBlob(ctx, desc) {
return s.a.Apply(ctx, desc, mounts, opts...)
}
var ocidesc ocispecs.Descriptor
if err := mount.WithTempMount(ctx, mounts, func(root string) error {
ra, err := s.cs.ReaderAt(ctx, desc)
if err != nil {
return errors.Wrap(err, "get reader from content store")
}
defer ra.Close()
pr, pw := io.Pipe()
go func() {
defer pw.Close()
if err := nydusify.Unpack(ctx, ra, pw, nydusify.UnpackOption{}); err != nil {
pw.CloseWithError(errors.Wrap(err, "unpack nydus blob"))
}
}()
defer pr.Close()
digester := digest.Canonical.Digester()
rc := &readCounter{
r: io.TeeReader(pr, digester.Hash()),
}
if _, err := archive.Apply(ctx, root, rc); err != nil {
return errors.Wrap(err, "apply nydus blob")
}
ocidesc = ocispecs.Descriptor{
MediaType: ocispecs.MediaTypeImageLayer,
Size: rc.c,
Digest: digester.Digest(),
}
return nil
}); err != nil {
return ocispecs.Descriptor{}, err
}
return ocidesc, nil
}
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