44 lines
913 B
Go
44 lines
913 B
Go
package contentutil
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
|
|
"github.com/containerd/containerd/content"
|
|
"github.com/containerd/containerd/remotes"
|
|
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
|
|
)
|
|
|
|
func Copy(ctx context.Context, ingester content.Ingester, provider content.Provider, desc ocispec.Descriptor) error {
|
|
if _, err := remotes.FetchHandler(ingester, &localFetcher{provider})(ctx, desc); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type localFetcher struct {
|
|
content.Provider
|
|
}
|
|
|
|
func (f *localFetcher) Fetch(ctx context.Context, desc ocispec.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 int
|
|
}
|
|
|
|
func (r *rc) Read(b []byte) (int, error) {
|
|
n, err := r.ReadAt(b, int64(r.offset))
|
|
r.offset += n
|
|
if n > 0 && err == io.EOF {
|
|
err = nil
|
|
}
|
|
return n, err
|
|
}
|