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package local
import (
"context"
"strconv"
"time"
"github.com/containerd/containerd/content"
"github.com/moby/buildkit/cache/remotecache"
"github.com/moby/buildkit/session"
sessioncontent "github.com/moby/buildkit/session/content"
"github.com/moby/buildkit/util/compression"
digest "github.com/opencontainers/go-digest"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
const (
attrDigest = "digest"
attrSrc = "src"
attrDest = "dest"
attrImageManifest = "image-manifest"
attrOCIMediatypes = "oci-mediatypes"
contentStoreIDPrefix = "local:"
)
type exporter struct {
remotecache.Exporter
}
func (*exporter) Name() string {
return "exporting cache to client directory"
}
// ResolveCacheExporterFunc for "local" cache exporter.
func ResolveCacheExporterFunc(sm *session.Manager) remotecache.ResolveCacheExporterFunc {
return func(ctx context.Context, g session.Group, attrs map[string]string) (remotecache.Exporter, error) {
store := attrs[attrDest]
if store == "" {
return nil, errors.New("local cache exporter requires dest")
}
compressionConfig, err := compression.ParseAttributes(attrs)
if err != nil {
return nil, err
}
ociMediatypes := true
if v, ok := attrs[attrOCIMediatypes]; ok {
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse %s", attrOCIMediatypes)
}
ociMediatypes = b
}
imageManifest := false
if v, ok := attrs[attrImageManifest]; ok {
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse %s", attrImageManifest)
}
imageManifest = b
}
csID := contentStoreIDPrefix + store
cs, err := getContentStore(ctx, sm, g, csID)
if err != nil {
return nil, err
}
return &exporter{remotecache.NewExporter(cs, "", ociMediatypes, imageManifest, compressionConfig)}, nil
}
}
// ResolveCacheImporterFunc for "local" cache importer.
func ResolveCacheImporterFunc(sm *session.Manager) remotecache.ResolveCacheImporterFunc {
return func(ctx context.Context, g session.Group, attrs map[string]string) (remotecache.Importer, ocispecs.Descriptor, error) {
dgstStr := attrs[attrDigest]
if dgstStr == "" {
return nil, ocispecs.Descriptor{}, errors.New("local cache importer requires explicit digest")
}
dgst := digest.Digest(dgstStr)
store := attrs[attrSrc]
if store == "" {
return nil, ocispecs.Descriptor{}, errors.New("local cache importer requires src")
}
csID := contentStoreIDPrefix + store
cs, err := getContentStore(ctx, sm, g, csID)
if err != nil {
return nil, ocispecs.Descriptor{}, err
}
info, err := cs.Info(ctx, dgst)
if err != nil {
return nil, ocispecs.Descriptor{}, err
}
desc := ocispecs.Descriptor{
// MediaType is typically MediaTypeDockerSchema2ManifestList,
// but we leave it empty until we get correct support for local index.json
Digest: dgst,
Size: info.Size,
}
return remotecache.NewImporter(cs), desc, nil
}
}
func getContentStore(ctx context.Context, sm *session.Manager, g session.Group, storeID string) (content.Store, error) {
// TODO: to ensure correct session is detected, new api for finding if storeID is supported is needed
sessionID := g.SessionIterator().NextSession()
if sessionID == "" {
return nil, errors.New("local cache exporter/importer requires session")
}
timeoutCtx, cancel := context.WithCancelCause(context.Background())
timeoutCtx, _ = context.WithTimeoutCause(timeoutCtx, 5*time.Second, errors.WithStack(context.DeadlineExceeded))
defer cancel(errors.WithStack(context.Canceled))
caller, err := sm.Get(timeoutCtx, sessionID, false)
if err != nil {
return nil, err
}
return &unlazyProvider{sessioncontent.NewCallerStore(caller, storeID), g}, nil
}
type unlazyProvider struct {
content.Store
s session.Group
}
func (p *unlazyProvider) UnlazySession(desc ocispecs.Descriptor) session.Group {
return p.s
}
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