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|
package contentutil
import (
"context"
"io"
"strings"
"sync"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/images"
"github.com/moby/buildkit/util/resolver/limited"
"github.com/moby/buildkit/util/resolver/retryhandler"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
func Copy(ctx context.Context, ingester content.Ingester, provider content.Provider, desc ocispecs.Descriptor, ref string, logger func([]byte)) error {
ctx = RegisterContentPayloadTypes(ctx)
if _, err := retryhandler.New(limited.FetchHandler(ingester, &localFetcher{provider}, ref), logger)(ctx, desc); err != nil {
return err
}
return nil
}
type localFetcher struct {
content.Provider
}
func (f *localFetcher) Fetch(ctx context.Context, desc ocispecs.Descriptor) (io.ReadCloser, error) {
r, err := f.Provider.ReaderAt(ctx, desc)
if err != nil {
return nil, err
}
return &rc{ReaderAt: r}, nil
}
type rc struct {
content.ReaderAt
offset int64
}
func (r *rc) Read(b []byte) (int, error) {
n, err := r.ReadAt(b, r.offset)
r.offset += int64(n)
if n > 0 && err == io.EOF {
err = nil
}
return n, err
}
func (r *rc) Seek(offset int64, whence int) (int64, error) {
switch whence {
case io.SeekStart:
r.offset = offset
case io.SeekCurrent:
r.offset += offset
case io.SeekEnd:
r.offset = r.Size() - offset
}
return r.offset, nil
}
func CopyChain(ctx context.Context, ingester content.Ingester, provider content.Provider, desc ocispecs.Descriptor) error {
ctx = RegisterContentPayloadTypes(ctx)
var m sync.Mutex
manifestStack := []ocispecs.Descriptor{}
filterHandler := images.HandlerFunc(func(ctx context.Context, desc ocispecs.Descriptor) ([]ocispecs.Descriptor, error) {
switch desc.MediaType {
case images.MediaTypeDockerSchema2Manifest, ocispecs.MediaTypeImageManifest,
images.MediaTypeDockerSchema2ManifestList, ocispecs.MediaTypeImageIndex:
m.Lock()
manifestStack = append(manifestStack, desc)
m.Unlock()
return nil, images.ErrStopHandler
default:
return nil, nil
}
})
handlers := []images.Handler{
annotateDistributionSourceHandler(images.ChildrenHandler(provider), desc.Annotations),
filterHandler,
retryhandler.New(limited.FetchHandler(ingester, &localFetcher{provider}, ""), func(_ []byte) {}),
}
if err := images.Dispatch(ctx, images.Handlers(handlers...), nil, desc); err != nil {
return errors.WithStack(err)
}
for i := len(manifestStack) - 1; i >= 0; i-- {
if err := Copy(ctx, ingester, provider, manifestStack[i], "", nil); err != nil {
return errors.WithStack(err)
}
}
return nil
}
func annotateDistributionSourceHandler(f images.HandlerFunc, basis map[string]string) images.HandlerFunc {
return func(ctx context.Context, desc ocispecs.Descriptor) ([]ocispecs.Descriptor, error) {
children, err := f(ctx, desc)
if err != nil {
return nil, err
}
// only add distribution source for the config or blob data descriptor
switch desc.MediaType {
case images.MediaTypeDockerSchema2Manifest, ocispecs.MediaTypeImageManifest,
images.MediaTypeDockerSchema2ManifestList, ocispecs.MediaTypeImageIndex:
default:
return children, nil
}
for i := range children {
child := children[i]
for k, v := range basis {
if !strings.HasPrefix(k, "containerd.io/distribution.source.") {
continue
}
if child.Annotations != nil {
if _, ok := child.Annotations[k]; ok {
// don't override if already present
continue
}
}
if child.Annotations == nil {
child.Annotations = map[string]string{}
}
child.Annotations[k] = v
}
children[i] = child
}
return children, nil
}
}
|
