67 lines
2.3 KiB
Go
67 lines
2.3 KiB
Go
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package remotes
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import (
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"context"
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"fmt"
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"github.com/Sirupsen/logrus"
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"github.com/docker/containerd/content"
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"github.com/docker/containerd/image"
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"github.com/docker/containerd/log"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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// MakeRef returns a unique reference for the descriptor. This reference can be
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// used to lookup ongoing processes related to the descriptor. This function
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// may look to the context to namespace the reference appropriately.
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func MakeRefKey(ctx context.Context, desc ocispec.Descriptor) string {
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// TODO(stevvooe): Need better remote key selection here. Should be a
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// product of the context, which may include information about the ongoing
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// fetch process.
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switch desc.MediaType {
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case image.MediaTypeDockerSchema2Manifest, ocispec.MediaTypeImageManifest,
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image.MediaTypeDockerSchema2ManifestList, ocispec.MediaTypeImageIndex:
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return "manifest-" + desc.Digest.String()
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case image.MediaTypeDockerSchema2Layer, image.MediaTypeDockerSchema2LayerGzip:
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return "layer-" + desc.Digest.String()
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case "application/vnd.docker.container.image.v1+json":
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return "config-" + desc.Digest.String()
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default:
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log.G(ctx).Warnf("reference for unknown type: %s", desc.MediaType)
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return "unknown-" + desc.Digest.String()
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}
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}
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// FetchHandler returns a handler that will fetch all content into the ingester
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// discovered in a call to Dispatch. Use with ChildrenHandler to do a full
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// recursive fetch.
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func FetchHandler(ingester content.Ingester, fetcher Fetcher) image.HandlerFunc {
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return func(ctx context.Context, desc ocispec.Descriptor) (subdescs []ocispec.Descriptor, err error) {
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ctx = log.WithLogger(ctx, log.G(ctx).WithFields(logrus.Fields{
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"digest": desc.Digest,
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"mediatype": desc.MediaType,
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"size": desc.Size,
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}))
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switch desc.MediaType {
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case image.MediaTypeDockerSchema2ManifestList, ocispec.MediaTypeImageIndex:
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return nil, fmt.Errorf("%v not yet supported", desc.MediaType)
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default:
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err := fetch(ctx, ingester, fetcher, desc)
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return nil, err
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}
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}
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}
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func fetch(ctx context.Context, ingester content.Ingester, fetcher Fetcher, desc ocispec.Descriptor) error {
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log.G(ctx).Debug("fetch")
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ref := MakeRefKey(ctx, desc)
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rc, err := fetcher.Fetch(ctx, desc)
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if err != nil {
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return err
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}
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defer rc.Close()
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return content.WriteBlob(ctx, ingester, ref, rc, desc.Size, desc.Digest)
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}
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