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pull.go
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pull.go
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package remotes
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"github.com/cnabio/cnab-go/bundle"
"github.com/cnabio/cnab-to-oci/converter"
"github.com/cnabio/cnab-to-oci/relocation"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/log"
"github.com/containerd/containerd/remotes"
"github.com/docker/cli/opts"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/client/auth"
ocischemav1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
// Pull pulls a bundle from an OCI Image Index manifest
func Pull(ctx context.Context, ref reference.Named, resolver remotes.Resolver) (*bundle.Bundle, relocation.ImageRelocationMap, error) {
log.G(ctx).Debugf("Pulling CNAB Bundle %s", ref)
index, err := getIndex(ctx, ref, resolver)
if err != nil {
return nil, nil, err
}
b, err := getBundle(ctx, ref, resolver, index)
if err != nil {
return nil, nil, err
}
relocationMap, err := converter.GenerateRelocationMap(&index, b, ref)
if err != nil {
return nil, nil, err
}
return b, relocationMap, nil
}
func getIndex(ctx context.Context, ref auth.Scope, resolver remotes.Resolver) (ocischemav1.Index, error) {
logger := log.G(ctx)
logger.Debug("Getting OCI Index Descriptor")
resolvedRef, indexDescriptor, err := resolver.Resolve(withMutedContext(ctx), ref.String())
if err != nil {
if errors.Cause(err) == errdefs.ErrNotFound {
return ocischemav1.Index{}, err
}
return ocischemav1.Index{}, fmt.Errorf("failed to resolve bundle manifest %q: %s", ref, err)
}
if indexDescriptor.MediaType != ocischemav1.MediaTypeImageIndex && indexDescriptor.MediaType != images.MediaTypeDockerSchema2ManifestList {
return ocischemav1.Index{}, fmt.Errorf("invalid media type %q for bundle manifest", indexDescriptor.MediaType)
}
logPayload(logger, indexDescriptor)
logger.Debugf("Fetching OCI Index %s", indexDescriptor.Digest)
indexPayload, err := pullPayload(ctx, resolver, resolvedRef, indexDescriptor)
if err != nil {
return ocischemav1.Index{}, fmt.Errorf("failed to pull bundle manifest %q: %s", ref, err)
}
var index ocischemav1.Index
if err := json.Unmarshal(indexPayload, &index); err != nil {
return ocischemav1.Index{}, fmt.Errorf("failed to pull bundle manifest %q: %s", ref, err)
}
logPayload(logger, index)
return index, nil
}
func getBundle(ctx context.Context, ref opts.NamedOption, resolver remotes.Resolver, index ocischemav1.Index) (*bundle.Bundle, error) {
repoOnly, err := reference.ParseNormalizedNamed(ref.Name())
if err != nil {
return nil, fmt.Errorf("invalid bundle manifest reference name %q: %s", ref, err)
}
// config is wrapped in an image manifest. So we first pull the manifest
// and then the config blob within it
configManifestDescriptor, err := getConfigManifestDescriptor(ctx, ref, index)
if err != nil {
return nil, err
}
manifest, err := getConfigManifest(ctx, ref, repoOnly, resolver, configManifestDescriptor)
if err != nil {
return nil, err
}
// Pull now the bundle itself
return getBundleConfig(ctx, ref, repoOnly, resolver, manifest)
}
func getConfigManifestDescriptor(ctx context.Context, ref opts.NamedOption, index ocischemav1.Index) (ocischemav1.Descriptor, error) {
logger := log.G(ctx)
logger.Debug("Getting Bundle Config Manifest Descriptor")
configManifestDescriptor, err := converter.GetBundleConfigManifestDescriptor(&index)
if err != nil {
return ocischemav1.Descriptor{}, fmt.Errorf("failed to get bundle config manifest from %q: %s", ref, err)
}
logPayload(logger, configManifestDescriptor)
return configManifestDescriptor, nil
}
func getConfigManifest(ctx context.Context, ref opts.NamedOption, repoOnly reference.Named, resolver remotes.Resolver, configManifestDescriptor ocischemav1.Descriptor) (ocischemav1.Manifest, error) {
logger := log.G(ctx)
logger.Debugf("Getting Bundle Config Manifest %s", configManifestDescriptor.Digest)
configManifestRef, err := reference.WithDigest(repoOnly, configManifestDescriptor.Digest)
if err != nil {
return ocischemav1.Manifest{}, fmt.Errorf("invalid bundle config manifest reference name %q: %s", ref, err)
}
configManifestPayload, err := pullPayload(ctx, resolver, configManifestRef.String(), configManifestDescriptor)
if err != nil {
return ocischemav1.Manifest{}, fmt.Errorf("failed to pull bundle config manifest %q: %s", ref, err)
}
var manifest ocischemav1.Manifest
if err := json.Unmarshal(configManifestPayload, &manifest); err != nil {
return ocischemav1.Manifest{}, err
}
logPayload(logger, manifest)
return manifest, err
}
func getBundleConfig(ctx context.Context, ref opts.NamedOption, repoOnly reference.Named, resolver remotes.Resolver, manifest ocischemav1.Manifest) (*bundle.Bundle, error) {
logger := log.G(ctx)
logger.Debugf("Fetching Bundle %s", manifest.Config.Digest)
configRef, err := reference.WithDigest(repoOnly, manifest.Config.Digest)
if err != nil {
return nil, fmt.Errorf("invalid bundle reference name %q: %s", ref, err)
}
configPayload, err := pullPayload(ctx, resolver, configRef.String(), ocischemav1.Descriptor{
Digest: manifest.Config.Digest,
MediaType: manifest.Config.MediaType,
Size: manifest.Config.Size,
})
if err != nil {
return nil, fmt.Errorf("failed to pull bundle %q: %s", ref, err)
}
var b bundle.Bundle
if err := json.Unmarshal(configPayload, &b); err != nil {
return nil, fmt.Errorf("failed to pull bundle %q: %s", ref, err)
}
logPayload(logger, b)
return &b, nil
}
func pullPayload(ctx context.Context, resolver remotes.Resolver, reference string, descriptor ocischemav1.Descriptor) ([]byte, error) {
ctx = withMutedContext(ctx)
fetcher, err := resolver.Fetcher(ctx, reference)
if err != nil {
return nil, err
}
reader, err := fetcher.Fetch(ctx, descriptor)
if err != nil {
return nil, err
}
defer reader.Close()
result, err := ioutil.ReadAll(reader)
return result, err
}