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//go:build nydus
// +build nydus
package compression
import (
"context"
"io"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/labels"
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"
)
type nydusType struct{}
var Nydus = nydusType{}
func init() {
toDockerLayerType[nydusify.MediaTypeNydusBlob] = nydusify.MediaTypeNydusBlob
toOCILayerType[nydusify.MediaTypeNydusBlob] = nydusify.MediaTypeNydusBlob
}
func Parse(t string) (Type, error) {
ct, err := parse(t)
if err != nil && t == Nydus.String() {
return Nydus, nil
}
return ct, err
}
func FromMediaType(mediaType string) (Type, error) {
ct, err := fromMediaType(mediaType)
if err != nil && mediaType == nydusify.MediaTypeNydusBlob {
return Nydus, nil
}
return ct, err
}
func (c nydusType) Compress(ctx context.Context, comp Config) (compressorFunc Compressor, finalize Finalizer) {
digester := digest.Canonical.Digester()
return func(dest io.Writer, requiredMediaType string) (io.WriteCloser, error) {
writer := io.MultiWriter(dest, digester.Hash())
return nydusify.Pack(ctx, writer, nydusify.PackOption{})
}, func(ctx context.Context, cs content.Store) (map[string]string, error) {
// Fill necessary labels
uncompressedDgst := digester.Digest().String()
info, err := cs.Info(ctx, digester.Digest())
if err != nil {
return nil, errors.Wrap(err, "get info from content store")
}
if info.Labels == nil {
info.Labels = make(map[string]string)
}
info.Labels[labels.LabelUncompressed] = uncompressedDgst
if _, err := cs.Update(ctx, info, "labels."+labels.LabelUncompressed); err != nil {
return nil, errors.Wrap(err, "update info to content store")
}
// Fill annotations
annotations := map[string]string{
labels.LabelUncompressed: uncompressedDgst,
// Use this annotation to identify nydus blob layer.
nydusify.LayerAnnotationNydusBlob: "true",
}
return annotations, nil
}
}
func (c nydusType) Decompress(ctx context.Context, cs content.Store, desc ocispecs.Descriptor) (io.ReadCloser, error) {
ra, err := cs.ReaderAt(ctx, desc)
if err != nil {
return nil, err
}
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"))
}
}()
return pr, nil
}
func (c nydusType) NeedsConversion(ctx context.Context, cs content.Store, desc ocispecs.Descriptor) (bool, error) {
if !images.IsLayerType(desc.MediaType) {
return false, nil
}
if isNydusBlob, err := c.Is(ctx, cs, desc); err != nil {
return true, nil
} else if isNydusBlob {
return false, nil
}
return true, nil
}
func (c nydusType) NeedsComputeDiffBySelf(comp Config) bool {
return true
}
func (c nydusType) OnlySupportOCITypes() bool {
return true
}
func (c nydusType) MediaType() string {
return nydusify.MediaTypeNydusBlob
}
func (c nydusType) String() string {
return "nydus"
}
// Is returns true when the specified digest of content exists in
// the content store and it's nydus format.
func (c nydusType) Is(ctx context.Context, cs content.Store, desc ocispecs.Descriptor) (bool, error) {
if desc.Annotations == nil {
return false, nil
}
hasMediaType := desc.MediaType == nydusify.MediaTypeNydusBlob
_, hasAnno := desc.Annotations[nydusify.LayerAnnotationNydusBlob]
_, err := cs.Info(ctx, desc.Digest)
if err != nil {
return false, err
}
return hasMediaType && hasAnno, nil
}
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