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writer.go
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/
writer.go
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package containerimage
import (
"bytes"
"context"
"encoding/json"
"fmt"
"os"
"strings"
"time"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/diff"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/platforms"
"github.com/containerd/continuity/fs"
intoto "github.com/in-toto/in-toto-golang/in_toto"
"github.com/moby/buildkit/cache"
cacheconfig "github.com/moby/buildkit/cache/config"
"github.com/moby/buildkit/exporter"
"github.com/moby/buildkit/exporter/containerimage/exptypes"
"github.com/moby/buildkit/exporter/util/epoch"
gatewaypb "github.com/moby/buildkit/frontend/gateway/pb"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/snapshot"
"github.com/moby/buildkit/solver"
"github.com/moby/buildkit/solver/result"
"github.com/moby/buildkit/util/attestation"
"github.com/moby/buildkit/util/bklog"
"github.com/moby/buildkit/util/buildinfo"
binfotypes "github.com/moby/buildkit/util/buildinfo/types"
"github.com/moby/buildkit/util/compression"
"github.com/moby/buildkit/util/progress"
"github.com/moby/buildkit/util/purl"
"github.com/moby/buildkit/util/system"
"github.com/moby/buildkit/util/tracing"
digest "github.com/opencontainers/go-digest"
specs "github.com/opencontainers/image-spec/specs-go"
ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
"golang.org/x/sync/errgroup"
)
type WriterOpt struct {
Snapshotter snapshot.Snapshotter
ContentStore content.Store
Applier diff.Applier
Differ diff.Comparer
}
func NewImageWriter(opt WriterOpt) (*ImageWriter, error) {
return &ImageWriter{opt: opt}, nil
}
type ImageWriter struct {
opt WriterOpt
}
func (ic *ImageWriter) Commit(ctx context.Context, inp *exporter.Source, sessionID string, opts *ImageCommitOpts) (*ocispecs.Descriptor, error) {
platformsBytes, ok := inp.Metadata[exptypes.ExporterPlatformsKey]
if len(inp.Refs) > 0 && !ok {
return nil, errors.Errorf("unable to export multiple refs, missing platforms mapping")
}
var p exptypes.Platforms
if ok && len(platformsBytes) > 0 {
if err := json.Unmarshal(platformsBytes, &p); err != nil {
return nil, errors.Wrapf(err, "failed to parse platforms passed to exporter")
}
}
if opts.Epoch == nil {
if tm, ok, err := epoch.ParseSource(inp); err != nil {
return nil, err
} else if ok {
opts.Epoch = tm
}
}
if len(inp.Refs) == 0 {
remotes, err := ic.exportLayers(ctx, opts.RefCfg, session.NewGroup(sessionID), inp.Ref)
if err != nil {
return nil, err
}
var dtbi []byte
if opts.BuildInfo {
if dtbi, err = buildinfo.Format(inp.Metadata[exptypes.ExporterBuildInfo], buildinfo.FormatOpts{
RemoveAttrs: !opts.BuildInfoAttrs,
}); err != nil {
return nil, err
}
}
mfstDesc, configDesc, err := ic.commitDistributionManifest(ctx, opts, inp.Ref, inp.Metadata[exptypes.ExporterImageConfigKey], &remotes[0], opts.Annotations.Platform(nil), inp.Metadata[exptypes.ExporterInlineCache], dtbi, opts.Epoch, session.NewGroup(sessionID))
if err != nil {
return nil, err
}
if mfstDesc.Annotations == nil {
mfstDesc.Annotations = make(map[string]string)
}
if len(p.Platforms) == 1 {
mfstDesc.Platform = &p.Platforms[0].Platform
}
mfstDesc.Annotations[exptypes.ExporterConfigDigestKey] = configDesc.Digest.String()
return mfstDesc, nil
}
attestCount := 0
for _, attests := range inp.Attestations {
attestCount += len(attests)
}
if count := attestCount + len(p.Platforms); count != len(inp.Refs) {
return nil, errors.Errorf("number of required refs (%d) does not match number of references (%d)", count, len(inp.Refs))
}
if attestCount > 0 {
opts.EnableOCITypes("attestations")
}
refs := make([]cache.ImmutableRef, 0, len(inp.Refs))
remotesMap := make(map[string]int, len(inp.Refs))
for id, r := range inp.Refs {
remotesMap[id] = len(refs)
refs = append(refs, r)
}
remotes, err := ic.exportLayers(ctx, opts.RefCfg, session.NewGroup(sessionID), refs...)
if err != nil {
return nil, err
}
idx := struct {
// MediaType is reserved in the OCI spec but
// excluded from go types.
MediaType string `json:"mediaType,omitempty"`
ocispecs.Index
}{
MediaType: ocispecs.MediaTypeImageIndex,
Index: ocispecs.Index{
Annotations: opts.Annotations.Platform(nil).Index,
Versioned: specs.Versioned{
SchemaVersion: 2,
},
},
}
if !opts.OCITypes {
idx.MediaType = images.MediaTypeDockerSchema2ManifestList
}
labels := map[string]string{}
var attestationManifests []ocispecs.Descriptor
for i, p := range p.Platforms {
r, ok := inp.Refs[p.ID]
if !ok {
return nil, errors.Errorf("failed to find ref for ID %s", p.ID)
}
config := inp.Metadata[fmt.Sprintf("%s/%s", exptypes.ExporterImageConfigKey, p.ID)]
inlineCache := inp.Metadata[fmt.Sprintf("%s/%s", exptypes.ExporterInlineCache, p.ID)]
var dtbi []byte
if opts.BuildInfo {
if dtbi, err = buildinfo.Format(inp.Metadata[fmt.Sprintf("%s/%s", exptypes.ExporterBuildInfo, p.ID)], buildinfo.FormatOpts{
RemoveAttrs: !opts.BuildInfoAttrs,
}); err != nil {
return nil, err
}
}
desc, _, err := ic.commitDistributionManifest(ctx, opts, r, config, &remotes[remotesMap[p.ID]], opts.Annotations.Platform(&p.Platform), inlineCache, dtbi, opts.Epoch, session.NewGroup(sessionID))
if err != nil {
return nil, err
}
dp := p.Platform
desc.Platform = &dp
idx.Manifests = append(idx.Manifests, *desc)
labels[fmt.Sprintf("containerd.io/gc.ref.content.%d", i)] = desc.Digest.String()
if attestations, ok := inp.Attestations[p.ID]; ok {
inTotos, err := ic.extractAttestations(ctx, opts, session.NewGroup(sessionID), desc, inp.Refs, attestations)
if err != nil {
return nil, err
}
desc, err := ic.commitAttestationsManifest(ctx, opts, p, desc.Digest.String(), inTotos)
if err != nil {
return nil, err
}
desc.Platform = &intotoPlatform
attestationManifests = append(attestationManifests, *desc)
}
}
for i, mfst := range attestationManifests {
idx.Manifests = append(idx.Manifests, mfst)
labels[fmt.Sprintf("containerd.io/gc.ref.content.%d", len(p.Platforms)+i)] = mfst.Digest.String()
}
idxBytes, err := json.MarshalIndent(idx, "", " ")
if err != nil {
return nil, errors.Wrap(err, "failed to marshal index")
}
idxDigest := digest.FromBytes(idxBytes)
idxDesc := ocispecs.Descriptor{
Digest: idxDigest,
Size: int64(len(idxBytes)),
MediaType: idx.MediaType,
Annotations: opts.Annotations.Platform(nil).IndexDescriptor,
}
idxDone := progress.OneOff(ctx, "exporting manifest list "+idxDigest.String())
if err := content.WriteBlob(ctx, ic.opt.ContentStore, idxDigest.String(), bytes.NewReader(idxBytes), idxDesc, content.WithLabels(labels)); err != nil {
return nil, idxDone(errors.Wrapf(err, "error writing manifest list blob %s", idxDigest))
}
idxDone(nil)
return &idxDesc, nil
}
func (ic *ImageWriter) exportLayers(ctx context.Context, refCfg cacheconfig.RefConfig, s session.Group, refs ...cache.ImmutableRef) ([]solver.Remote, error) {
attr := []attribute.KeyValue{
attribute.String("exportLayers.compressionType", refCfg.Compression.Type.String()),
attribute.Bool("exportLayers.forceCompression", refCfg.Compression.Force),
}
if refCfg.Compression.Level != nil {
attr = append(attr, attribute.Int("exportLayers.compressionLevel", *refCfg.Compression.Level))
}
span, ctx := tracing.StartSpan(ctx, "export layers", trace.WithAttributes(attr...))
eg, ctx := errgroup.WithContext(ctx)
layersDone := progress.OneOff(ctx, "exporting layers")
out := make([]solver.Remote, len(refs))
for i, ref := range refs {
func(i int, ref cache.ImmutableRef) {
if ref == nil {
return
}
eg.Go(func() error {
remotes, err := ref.GetRemotes(ctx, true, refCfg, false, s)
if err != nil {
return err
}
remote := remotes[0]
out[i] = *remote
return nil
})
}(i, ref)
}
err := layersDone(eg.Wait())
tracing.FinishWithError(span, err)
return out, err
}
func (ic *ImageWriter) extractAttestations(ctx context.Context, opts *ImageCommitOpts, s session.Group, desc *ocispecs.Descriptor, refs map[string]cache.ImmutableRef, attestations []result.Attestation) ([]intoto.Statement, error) {
eg, ctx := errgroup.WithContext(ctx)
statements := make([][]intoto.Statement, len(attestations))
var purls []string
for _, name := range strings.Split(opts.ImageName, ",") {
if name == "" {
continue
}
p, err := purl.RefToPURL(name, desc.Platform)
if err != nil {
return nil, err
}
purls = append(purls, p)
}
if len(attestations) > 0 && refs == nil {
return nil, errors.Errorf("no refs map provided to lookup attestation keys")
}
for i, att := range attestations {
i, att := i, att
eg.Go(func() error {
ref, ok := refs[att.Ref]
if !ok {
return errors.Errorf("key %s not found in refs map", att.Ref)
}
mount, err := ref.Mount(ctx, true, s)
if err != nil {
return err
}
lm := snapshot.LocalMounter(mount)
src, err := lm.Mount()
if err != nil {
return err
}
defer lm.Unmount()
switch att.Kind {
case gatewaypb.AttestationKindInToto:
p, err := fs.RootPath(src, att.Path)
if err != nil {
return err
}
data, err := os.ReadFile(p)
if err != nil {
return errors.Wrap(err, "cannot read in-toto attestation")
}
if len(data) == 0 {
data = nil
}
var subjects []intoto.Subject
if len(att.InToto.Subjects) == 0 {
att.InToto.Subjects = []result.InTotoSubject{{
Kind: gatewaypb.InTotoSubjectKindSelf,
}}
}
for _, subject := range att.InToto.Subjects {
name := "_"
if subject.Name != "" {
name = subject.Name
}
switch subject.Kind {
case gatewaypb.InTotoSubjectKindSelf:
names := []string{}
if name != "_" {
names = append(names, name)
}
names = append(names, purls...)
for _, name := range names {
subjects = append(subjects, intoto.Subject{
Name: name,
Digest: result.DigestMap(desc.Digest),
})
}
case gatewaypb.InTotoSubjectKindRaw:
subjects = append(subjects, intoto.Subject{
Name: name,
Digest: result.DigestMap(subject.Digest...),
})
default:
return errors.Errorf("unknown attestation subject type %T", subject)
}
}
stmt := intoto.Statement{
StatementHeader: intoto.StatementHeader{
Type: intoto.StatementInTotoV01,
PredicateType: att.InToto.PredicateType,
Subject: subjects,
},
Predicate: json.RawMessage(data),
}
statements[i] = append(statements[i], stmt)
case gatewaypb.AttestationKindBundle:
dir, err := fs.RootPath(src, att.Path)
if err != nil {
return err
}
entries, err := os.ReadDir(dir)
if err != nil {
return err
}
for _, entry := range entries {
p, err := fs.RootPath(dir, entry.Name())
if err != nil {
return err
}
f, err := os.Open(p)
if err != nil {
return err
}
dec := json.NewDecoder(f)
var stmt intoto.Statement
if err := dec.Decode(&stmt); err != nil {
return errors.Wrap(err, "cannot decode in-toto statement")
}
if att.InToto.PredicateType != "" && stmt.PredicateType != att.InToto.PredicateType {
return errors.Errorf("bundle entry %s does not match required predicate type %s", stmt.PredicateType, att.InToto.PredicateType)
}
if stmt.Subject == nil {
for _, name := range purls {
stmt.Subject = append(stmt.Subject, intoto.Subject{
Name: name,
Digest: result.DigestMap(desc.Digest),
})
}
}
statements[i] = append(statements[i], stmt)
}
}
return nil
})
}
if err := eg.Wait(); err != nil {
return nil, err
}
var allStatements []intoto.Statement
for _, statements := range statements {
allStatements = append(allStatements, statements...)
}
return allStatements, nil
}
func (ic *ImageWriter) commitDistributionManifest(ctx context.Context, opts *ImageCommitOpts, ref cache.ImmutableRef, config []byte, remote *solver.Remote, annotations *Annotations, inlineCache []byte, buildInfo []byte, epoch *time.Time, sg session.Group) (*ocispecs.Descriptor, *ocispecs.Descriptor, error) {
if len(config) == 0 {
var err error
config, err = defaultImageConfig()
if err != nil {
return nil, nil, err
}
}
if remote == nil {
remote = &solver.Remote{
Provider: ic.opt.ContentStore,
}
}
history, err := parseHistoryFromConfig(config)
if err != nil {
return nil, nil, err
}
remote, history, err = patchImageLayers(ctx, remote, history, ref, opts, sg)
if err != nil {
return nil, nil, err
}
config, err = patchImageConfig(config, remote.Descriptors, history, inlineCache, buildInfo, epoch)
if err != nil {
return nil, nil, err
}
var (
configDigest = digest.FromBytes(config)
manifestType = ocispecs.MediaTypeImageManifest
configType = ocispecs.MediaTypeImageConfig
)
// Use docker media types for older Docker versions and registries
if !opts.OCITypes {
manifestType = images.MediaTypeDockerSchema2Manifest
configType = images.MediaTypeDockerSchema2Config
}
mfst := struct {
// MediaType is reserved in the OCI spec but
// excluded from go types.
MediaType string `json:"mediaType,omitempty"`
ocispecs.Manifest
}{
MediaType: manifestType,
Manifest: ocispecs.Manifest{
Annotations: annotations.Manifest,
Versioned: specs.Versioned{
SchemaVersion: 2,
},
Config: ocispecs.Descriptor{
Digest: configDigest,
Size: int64(len(config)),
MediaType: configType,
},
},
}
labels := map[string]string{
"containerd.io/gc.ref.content.0": configDigest.String(),
}
for i, desc := range remote.Descriptors {
removeInternalLayerAnnotations(&desc, opts.OCITypes)
mfst.Layers = append(mfst.Layers, desc)
labels[fmt.Sprintf("containerd.io/gc.ref.content.%d", i+1)] = desc.Digest.String()
}
mfstJSON, err := json.MarshalIndent(mfst, "", " ")
if err != nil {
return nil, nil, errors.Wrap(err, "failed to marshal manifest")
}
mfstDigest := digest.FromBytes(mfstJSON)
mfstDesc := ocispecs.Descriptor{
Digest: mfstDigest,
Size: int64(len(mfstJSON)),
}
mfstDone := progress.OneOff(ctx, "exporting manifest "+mfstDigest.String())
if err := content.WriteBlob(ctx, ic.opt.ContentStore, mfstDigest.String(), bytes.NewReader(mfstJSON), mfstDesc, content.WithLabels((labels))); err != nil {
return nil, nil, mfstDone(errors.Wrapf(err, "error writing manifest blob %s", mfstDigest))
}
mfstDone(nil)
configDesc := ocispecs.Descriptor{
Digest: configDigest,
Size: int64(len(config)),
MediaType: configType,
}
configDone := progress.OneOff(ctx, "exporting config "+configDigest.String())
if err := content.WriteBlob(ctx, ic.opt.ContentStore, configDigest.String(), bytes.NewReader(config), configDesc); err != nil {
return nil, nil, configDone(errors.Wrap(err, "error writing config blob"))
}
configDone(nil)
return &ocispecs.Descriptor{
Annotations: annotations.ManifestDescriptor,
Digest: mfstDigest,
Size: int64(len(mfstJSON)),
MediaType: manifestType,
}, &configDesc, nil
}
func (ic *ImageWriter) commitAttestationsManifest(ctx context.Context, opts *ImageCommitOpts, p exptypes.Platform, target string, statements []intoto.Statement) (*ocispecs.Descriptor, error) {
var (
manifestType = ocispecs.MediaTypeImageManifest
configType = ocispecs.MediaTypeImageConfig
)
if !opts.OCITypes {
manifestType = images.MediaTypeDockerSchema2Manifest
configType = images.MediaTypeDockerSchema2Config
}
layers := make([]ocispecs.Descriptor, len(statements))
for i, statement := range statements {
i, statement := i, statement
data, err := json.Marshal(statement)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal attestation")
}
digest := digest.FromBytes(data)
desc := ocispecs.Descriptor{
MediaType: attestation.MediaTypeDockerSchema2AttestationType,
Digest: digest,
Size: int64(len(data)),
Annotations: map[string]string{
"containerd.io/uncompressed": digest.String(),
"in-toto.io/predicate-type": statement.PredicateType,
},
}
if err := content.WriteBlob(ctx, ic.opt.ContentStore, digest.String(), bytes.NewReader(data), desc); err != nil {
return nil, errors.Wrapf(err, "error writing data blob %s", digest)
}
layers[i] = desc
}
config, err := attestationsConfig(layers)
if err != nil {
return nil, err
}
configDigest := digest.FromBytes(config)
configDesc := ocispecs.Descriptor{
Digest: configDigest,
Size: int64(len(config)),
MediaType: configType,
}
mfst := struct {
// MediaType is reserved in the OCI spec but
// excluded from go types.
MediaType string `json:"mediaType,omitempty"`
ocispecs.Manifest
}{
MediaType: manifestType,
Manifest: ocispecs.Manifest{
Versioned: specs.Versioned{
SchemaVersion: 2,
},
Config: ocispecs.Descriptor{
Digest: configDigest,
Size: int64(len(config)),
MediaType: configType,
},
},
}
labels := map[string]string{
"containerd.io/gc.ref.content.0": configDigest.String(),
}
for i, desc := range layers {
removeInternalLayerAnnotations(&desc, opts.OCITypes)
mfst.Layers = append(mfst.Layers, desc)
labels[fmt.Sprintf("containerd.io/gc.ref.content.%d", i+1)] = desc.Digest.String()
}
mfstJSON, err := json.MarshalIndent(mfst, "", " ")
if err != nil {
return nil, errors.Wrap(err, "failed to marshal manifest")
}
mfstDigest := digest.FromBytes(mfstJSON)
mfstDesc := ocispecs.Descriptor{
Digest: mfstDigest,
Size: int64(len(mfstJSON)),
}
done := progress.OneOff(ctx, "exporting attestation manifest "+mfstDigest.String())
if err := content.WriteBlob(ctx, ic.opt.ContentStore, mfstDigest.String(), bytes.NewReader(mfstJSON), mfstDesc, content.WithLabels((labels))); err != nil {
return nil, done(errors.Wrapf(err, "error writing manifest blob %s", mfstDigest))
}
if err := content.WriteBlob(ctx, ic.opt.ContentStore, configDigest.String(), bytes.NewReader(config), configDesc); err != nil {
return nil, done(errors.Wrap(err, "error writing config blob"))
}
done(nil)
return &ocispecs.Descriptor{
Digest: mfstDigest,
Size: int64(len(mfstJSON)),
MediaType: manifestType,
Annotations: map[string]string{
attestation.DockerAnnotationReferenceType: attestation.DockerAnnotationReferenceTypeDefault,
attestation.DockerAnnotationReferenceDigest: target,
},
}, nil
}
func (ic *ImageWriter) ContentStore() content.Store {
return ic.opt.ContentStore
}
func (ic *ImageWriter) Snapshotter() snapshot.Snapshotter {
return ic.opt.Snapshotter
}
func (ic *ImageWriter) Applier() diff.Applier {
return ic.opt.Applier
}
func defaultImageConfig() ([]byte, error) {
pl := platforms.Normalize(platforms.DefaultSpec())
img := ocispecs.Image{
Architecture: pl.Architecture,
OS: pl.OS,
Variant: pl.Variant,
}
img.RootFS.Type = "layers"
img.Config.WorkingDir = "/"
img.Config.Env = []string{"PATH=" + system.DefaultPathEnv(pl.OS)}
dt, err := json.Marshal(img)
return dt, errors.Wrap(err, "failed to create empty image config")
}
func attestationsConfig(layers []ocispecs.Descriptor) ([]byte, error) {
img := ocispecs.Image{
Architecture: intotoPlatform.Architecture,
OS: intotoPlatform.OS,
OSVersion: intotoPlatform.OSVersion,
OSFeatures: intotoPlatform.OSFeatures,
Variant: intotoPlatform.Variant,
}
img.RootFS.Type = "layers"
for _, layer := range layers {
img.RootFS.DiffIDs = append(img.RootFS.DiffIDs, digest.Digest(layer.Annotations["containerd.io/uncompressed"]))
}
dt, err := json.Marshal(img)
return dt, errors.Wrap(err, "failed to create attestations image config")
}
func parseHistoryFromConfig(dt []byte) ([]ocispecs.History, error) {
var config struct {
History []ocispecs.History
}
if err := json.Unmarshal(dt, &config); err != nil {
return nil, errors.Wrap(err, "failed to unmarshal history from config")
}
return config.History, nil
}
func patchImageConfig(dt []byte, descs []ocispecs.Descriptor, history []ocispecs.History, cache []byte, buildInfo []byte, epoch *time.Time) ([]byte, error) {
m := map[string]json.RawMessage{}
if err := json.Unmarshal(dt, &m); err != nil {
return nil, errors.Wrap(err, "failed to parse image config for patch")
}
var rootFS ocispecs.RootFS
rootFS.Type = "layers"
for _, desc := range descs {
rootFS.DiffIDs = append(rootFS.DiffIDs, digest.Digest(desc.Annotations["containerd.io/uncompressed"]))
}
dt, err := json.Marshal(rootFS)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal rootfs")
}
m["rootfs"] = dt
if epoch != nil {
for i, h := range history {
if h.Created == nil || h.Created.After(*epoch) {
history[i].Created = epoch
}
}
}
dt, err = json.Marshal(history)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal history")
}
m["history"] = dt
// if epoch is set then clamp creation time
if v, ok := m["created"]; ok && epoch != nil {
var tm time.Time
if err := json.Unmarshal(v, &tm); err != nil {
return nil, errors.Wrapf(err, "failed to unmarshal creation time %q", m["created"])
}
if tm.After(*epoch) {
dt, err = json.Marshal(&epoch)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal creation time")
}
m["created"] = dt
}
}
if _, ok := m["created"]; !ok {
var tm *time.Time
for _, h := range history {
if h.Created != nil {
tm = h.Created
}
}
dt, err = json.Marshal(&tm)
if err != nil {
return nil, errors.Wrap(err, "failed to marshal creation time")
}
m["created"] = dt
}
if cache != nil {
dt, err := json.Marshal(cache)
if err != nil {
return nil, err
}
m["moby.buildkit.cache.v0"] = dt
}
if buildInfo != nil {
dt, err := json.Marshal(buildInfo)
if err != nil {
return nil, err
}
m[binfotypes.ImageConfigField] = dt
} else {
delete(m, binfotypes.ImageConfigField)
}
dt, err = json.Marshal(m)
return dt, errors.Wrap(err, "failed to marshal config after patch")
}
func normalizeLayersAndHistory(ctx context.Context, remote *solver.Remote, history []ocispecs.History, ref cache.ImmutableRef, oci bool) (*solver.Remote, []ocispecs.History) {
refMeta := getRefMetadata(ref, len(remote.Descriptors))
var historyLayers int
for _, h := range history {
if !h.EmptyLayer {
historyLayers++
}
}
if historyLayers > len(remote.Descriptors) {
// this case shouldn't happen but if it does force set history layers empty
// from the bottom
bklog.G(ctx).Warn("invalid image config with unaccounted layers")
historyCopy := make([]ocispecs.History, 0, len(history))
var l int
for _, h := range history {
if l >= len(remote.Descriptors) {
h.EmptyLayer = true
}
if !h.EmptyLayer {
l++
}
historyCopy = append(historyCopy, h)
}
history = historyCopy
}
if len(remote.Descriptors) > historyLayers {
// some history items are missing. add them based on the ref metadata
for _, md := range refMeta[historyLayers:] {
history = append(history, ocispecs.History{
Created: md.createdAt,
CreatedBy: md.description,
Comment: "buildkit.exporter.image.v0",
})
}
}
var layerIndex int
for i, h := range history {
if !h.EmptyLayer {
if h.Created == nil {
h.Created = refMeta[layerIndex].createdAt
}
layerIndex++
}
history[i] = h
}
// Find the first new layer time. Otherwise, the history item for a first
// metadata command would be the creation time of a base image layer.
// If there is no such then the last layer with timestamp.
var created *time.Time
var noCreatedTime bool
for _, h := range history {
if h.Created != nil {
created = h.Created
if noCreatedTime {
break
}
} else {
noCreatedTime = true
}
}
// Fill in created times for all history items to be either the first new
// layer time or the previous layer.
noCreatedTime = false
for i, h := range history {
if h.Created != nil {
if noCreatedTime {
created = h.Created
}
} else {
noCreatedTime = true
h.Created = created
}
history[i] = h
}
// convert between oci and docker media types (or vice versa) if needed
remote.Descriptors = compression.ConvertAllLayerMediaTypes(oci, remote.Descriptors...)
return remote, history
}
func removeInternalLayerAnnotations(desc *ocispecs.Descriptor, oci bool) {
if oci {
// oci supports annotations but don't export internal annotations
delete(desc.Annotations, "containerd.io/uncompressed")
delete(desc.Annotations, "buildkit/createdat")
for k := range desc.Annotations {
if strings.HasPrefix(k, "containerd.io/distribution.source.") {
delete(desc.Annotations, k)
}
}
} else {
desc.Annotations = nil
}
}
type refMetadata struct {
description string
createdAt *time.Time
}
func getRefMetadata(ref cache.ImmutableRef, limit int) []refMetadata {
if ref == nil {
return make([]refMetadata, limit)
}
layerChain := ref.LayerChain()
defer layerChain.Release(context.TODO())
if limit < len(layerChain) {
layerChain = layerChain[len(layerChain)-limit:]
}
metas := make([]refMetadata, len(layerChain))
for i, layer := range layerChain {
meta := &metas[i]
if description := layer.GetDescription(); description != "" {
meta.description = description
} else {
meta.description = "created by buildkit" // shouldn't be shown but don't fail build
}
createdAt := layer.GetCreatedAt()
meta.createdAt = &createdAt
}
return metas
}