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package localinlinecache
import (
"context"
"encoding/json"
"time"
"github.com/containerd/containerd/v2/core/content"
c8dimages "github.com/containerd/containerd/v2/core/images"
"github.com/containerd/containerd/v2/core/remotes/docker"
distreference "github.com/distribution/reference"
imagestore "github.com/docker/docker/image"
"github.com/docker/docker/reference"
"github.com/moby/buildkit/cache/remotecache"
registryremotecache "github.com/moby/buildkit/cache/remotecache/registry"
v1 "github.com/moby/buildkit/cache/remotecache/v1"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/solver"
"github.com/moby/buildkit/worker"
"github.com/opencontainers/go-digest"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
// ResolveCacheImporterFunc returns a resolver function for local inline cache
func ResolveCacheImporterFunc(sm *session.Manager, resolverFunc docker.RegistryHosts, cs content.Store, rs reference.Store, is imagestore.Store) remotecache.ResolveCacheImporterFunc {
upstream := registryremotecache.ResolveCacheImporterFunc(sm, cs, resolverFunc)
return func(ctx context.Context, group session.Group, attrs map[string]string) (remotecache.Importer, ocispec.Descriptor, error) {
if dt, err := tryImportLocal(rs, is, attrs["ref"]); err == nil {
return newLocalImporter(dt), ocispec.Descriptor{}, nil
}
return upstream(ctx, group, attrs)
}
}
func tryImportLocal(rs reference.Store, is imagestore.Store, refStr string) ([]byte, error) {
ref, err := distreference.ParseNormalizedNamed(refStr)
if err != nil {
return nil, err
}
dgst, err := rs.Get(ref)
if err != nil {
return nil, err
}
img, err := is.Get(imagestore.ID(dgst))
if err != nil {
return nil, err
}
return img.RawJSON(), nil
}
func newLocalImporter(dt []byte) remotecache.Importer {
return &localImporter{dt: dt}
}
type localImporter struct {
dt []byte
}
func (li *localImporter) Resolve(ctx context.Context, _ ocispec.Descriptor, id string, w worker.Worker) (solver.CacheManager, error) {
cc := v1.NewCacheChains()
if err := li.importInlineCache(ctx, li.dt, cc); err != nil {
return nil, err
}
keysStorage, resultStorage, err := v1.NewCacheKeyStorage(cc, w)
if err != nil {
return nil, err
}
return solver.NewCacheManager(ctx, id, keysStorage, resultStorage), nil
}
func (li *localImporter) importInlineCache(ctx context.Context, dt []byte, cc solver.CacheExporterTarget) error {
var img image
if err := json.Unmarshal(dt, &img); err != nil {
return err
}
if img.Cache == nil {
return nil
}
var config v1.CacheConfig
if err := json.Unmarshal(img.Cache, &config.Records); err != nil {
return err
}
createdDates, createdMsg, err := parseCreatedLayerInfo(img)
if err != nil {
return err
}
layers := v1.DescriptorProvider{}
for i, diffID := range img.Rootfs.DiffIDs {
dgst := digest.Digest(diffID.String())
desc := ocispec.Descriptor{
Digest: dgst,
Size: -1,
MediaType: c8dimages.MediaTypeDockerSchema2Layer,
Annotations: map[string]string{},
}
if createdAt := createdDates[i]; createdAt != "" {
desc.Annotations["buildkit/createdat"] = createdAt
}
if createdBy := createdMsg[i]; createdBy != "" {
desc.Annotations["buildkit/description"] = createdBy
}
desc.Annotations["containerd.io/uncompressed"] = img.Rootfs.DiffIDs[i].String()
layers[dgst] = v1.DescriptorProviderPair{
Descriptor: desc,
Provider: &emptyProvider{},
}
config.Layers = append(config.Layers, v1.CacheLayer{
Blob: dgst,
ParentIndex: i - 1,
})
}
return v1.ParseConfig(config, layers, cc)
}
type image struct {
Rootfs struct {
DiffIDs []digest.Digest `json:"diff_ids"`
} `json:"rootfs"`
Cache []byte `json:"moby.buildkit.cache.v0"`
History []struct {
Created *time.Time `json:"created,omitempty"`
CreatedBy string `json:"created_by,omitempty"`
EmptyLayer bool `json:"empty_layer,omitempty"`
} `json:"history,omitempty"`
}
func parseCreatedLayerInfo(img image) ([]string, []string, error) {
dates := make([]string, 0, len(img.Rootfs.DiffIDs))
createdBy := make([]string, 0, len(img.Rootfs.DiffIDs))
for _, h := range img.History {
if !h.EmptyLayer {
str := ""
if h.Created != nil {
dt, err := h.Created.MarshalText()
if err != nil {
return nil, nil, err
}
str = string(dt)
}
dates = append(dates, str)
createdBy = append(createdBy, h.CreatedBy)
}
}
return dates, createdBy, nil
}
type emptyProvider struct{}
func (p *emptyProvider) ReaderAt(ctx context.Context, dec ocispec.Descriptor) (content.ReaderAt, error) {
return nil, errors.Errorf("ReaderAt not implemented for empty provider")
}
|
