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index.go
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index.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package oci
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"time"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/google/go-containerregistry/pkg/name"
specs "github.com/opencontainers/image-spec/specs-go"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"oras.land/oras-go/v2/content"
"kraftkit.sh/internal/version"
"kraftkit.sh/oci/handler"
)
type Index struct {
handle handler.Handler
index *ocispec.Index
desc *ocispec.Descriptor
manifests []*Manifest
annotations map[string]string
saved bool
}
// NewIndex instantiates a new index using the provided handler.
func NewIndex(_ context.Context, handle handler.Handler) (*Index, error) {
if handle == nil {
return nil, fmt.Errorf("cannot use `NewIndex` without handler")
}
index := Index{
handle: handle,
saved: false,
}
return &index, nil
}
// NewIndexFromSpec instantiates a new index using the provided handler as well
// as a reference
func NewIndexFromSpec(ctx context.Context, handle handler.Handler, spec *ocispec.Index) (*Index, error) {
index, err := NewIndex(ctx, handle)
if err != nil {
return nil, err
}
index.index = spec
indexJson, err := json.Marshal(spec)
if err != nil {
return nil, fmt.Errorf("failed to marshal manifest: %w", err)
}
indexDesc := content.NewDescriptorFromBytes(
ocispec.MediaTypeImageIndex,
indexJson,
)
index.desc = &indexDesc
for _, desc := range spec.Manifests {
manifest, err := NewManifestFromDigest(ctx, handle, desc.Digest)
if err != nil {
return nil, fmt.Errorf("could not instantiate manifest from structure: %w", err)
}
index.manifests = append(index.manifests, manifest)
}
return index, nil
}
// NewIndexFromRef instantiates a new index using the provided reference which
// is used by the handle to look up any local existing indexes.
func NewIndexFromRef(ctx context.Context, handle handler.Handler, ref string) (*Index, error) {
spec, err := handle.ResolveIndex(ctx, ref)
if err != nil {
return nil, fmt.Errorf("cannot instantiate index from unknown reference '%s'", ref)
}
index, err := NewIndexFromSpec(ctx, handle, spec)
if err != nil {
return nil, err
}
index.saved = true
return index, nil
}
// SetAnnotation sets an anootation of the image with the provided key.
func (index *Index) SetAnnotation(_ context.Context, key, val string) {
if index.annotations == nil {
index.annotations = make(map[string]string)
}
index.saved = false
index.annotations[key] = val
}
// Annotations returns the map of annotations for the index.
func (index *Index) Annotations() map[string]string {
return index.annotations
}
// IndexDesc returns the descriptor of the index.
func (index *Index) Descriptor() (*ocispec.Descriptor, error) {
if index.desc != nil {
return index.desc, nil
}
indexJson, err := json.Marshal(index.index)
if err != nil {
return nil, fmt.Errorf("failed to marshal manifest: %w", err)
}
desc := content.NewDescriptorFromBytes(
ocispec.MediaTypeImageIndex,
indexJson,
)
desc.Annotations = index.Annotations()
index.desc = &desc
return &desc, nil
}
// AddManifest adds a manifest based an previously instantiated Manifest
// structure.
func (index *Index) AddManifest(_ context.Context, manifest *Manifest) error {
if index.manifests == nil {
index.manifests = []*Manifest{}
}
index.desc = nil
index.saved = false
for _, m := range index.manifests {
if m.desc != nil && manifest.desc != nil && m.desc.Digest == manifest.desc.Digest {
return nil
}
}
index.manifests = append(index.manifests, manifest)
return nil
}
// Save the index.
func (index *Index) Save(ctx context.Context, fullref string, onProgress func(float64)) (ocispec.Descriptor, error) {
if index.saved {
return *index.desc, nil
}
if index.desc != nil {
if info, _ := index.handle.DigestInfo(ctx, index.desc.Digest); info != nil {
return *index.desc, nil
}
}
ref, err := name.ParseReference(fullref,
name.WithDefaultRegistry(""),
name.WithDefaultTag(DefaultTag),
)
if err != nil {
return ocispec.Descriptor{}, err
}
// Pack the given blobs which generates an image manifest for the pack, and
// pushes it to a content storage.
if index.annotations == nil {
index.annotations = make(map[string]string)
}
// General annotations
index.annotations[ocispec.AnnotationRefName] = ref.Context().String()
index.annotations[ocispec.AnnotationCreated] = time.Now().UTC().Format(time.RFC3339)
index.annotations[AnnotationKraftKitVersion] = version.Version()
// containerd compatibility annotations
index.annotations[images.AnnotationImageName] = ref.String()
manifestDescs := make([]ocispec.Descriptor, len(index.manifests))
for i, manifest := range index.manifests {
desc := manifest.desc
if !manifest.saved {
desc, err = manifest.Save(ctx, ref.Name(), nil)
if err != nil {
return ocispec.Descriptor{}, fmt.Errorf("could not save manifest: %w", err)
}
// Reset the index descriptor if a new manifest is added via local save
index.index = nil
}
manifestDescs[i] = *desc
}
if index.index == nil {
// Generate the final manifest
index.index = &ocispec.Index{
MediaType: ocispec.MediaTypeImageIndex,
Versioned: specs.Versioned{
SchemaVersion: 2,
},
Manifests: manifestDescs,
Annotations: index.annotations,
}
index.desc = nil
}
indexJson, err := json.Marshal(index.index)
if err != nil {
return ocispec.Descriptor{}, fmt.Errorf("failed to marshal manifest: %w", err)
}
if index.desc == nil {
indexDesc := content.NewDescriptorFromBytes(
ocispec.MediaTypeImageIndex,
indexJson,
)
indexDesc.Annotations = index.index.Annotations
index.desc = &indexDesc
}
// Remove the old index
if err := index.handle.DeleteIndex(ctx, ref.Name(), false); err != nil {
return ocispec.Descriptor{}, fmt.Errorf("failed to remove old index: %w", err)
}
// save the manifest digest
if err := index.handle.SaveDescriptor(
ctx,
ref.Name(),
*index.desc,
bytes.NewReader(indexJson),
onProgress,
); err != nil && !errors.Is(err, errdefs.ErrAlreadyExists) {
return ocispec.Descriptor{}, fmt.Errorf("failed to save manifest: %w", err)
}
index.saved = true
return *index.desc, nil
}