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export.go
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export.go
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package mobyexporter
import (
"context"
"encoding/json"
"fmt"
"strings"
distref "github.com/docker/distribution/reference"
"github.com/docker/docker/image"
"github.com/docker/docker/layer"
"github.com/moby/buildkit/exporter"
"github.com/moby/buildkit/exporter/containerimage/exptypes"
"github.com/opencontainers/go-digest"
"github.com/pkg/errors"
)
const (
keyImageName = "name"
)
// Differ can make a moby layer from a snapshot
type Differ interface {
EnsureLayer(ctx context.Context, key string) ([]layer.DiffID, error)
}
type ImageTagger interface {
TagImage(ctx context.Context, imageID image.ID, newTag distref.Named) error
}
// Opt defines a struct for creating new exporter
type Opt struct {
ImageStore image.Store
Differ Differ
ImageTagger ImageTagger
}
type imageExporter struct {
opt Opt
}
// New creates a new moby imagestore exporter
func New(opt Opt) (exporter.Exporter, error) {
im := &imageExporter{opt: opt}
return im, nil
}
func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exporter.ExporterInstance, error) {
i := &imageExporterInstance{
imageExporter: e,
}
for k, v := range opt {
switch k {
case keyImageName:
for _, v := range strings.Split(v, ",") {
ref, err := distref.ParseNormalizedNamed(v)
if err != nil {
return nil, err
}
i.targetNames = append(i.targetNames, ref)
}
default:
if i.meta == nil {
i.meta = make(map[string][]byte)
}
i.meta[k] = []byte(v)
}
}
return i, nil
}
type imageExporterInstance struct {
*imageExporter
targetNames []distref.Named
meta map[string][]byte
}
func (e *imageExporterInstance) Name() string {
return "exporting to image"
}
func (e *imageExporterInstance) Config() *exporter.Config {
return exporter.NewConfig()
}
func (e *imageExporterInstance) Export(ctx context.Context, inp *exporter.Source, sessionID string) (map[string]string, exporter.DescriptorReference, error) {
if len(inp.Refs) > 1 {
return nil, nil, fmt.Errorf("exporting multiple references to image store is currently unsupported")
}
ref := inp.Ref
if ref != nil && len(inp.Refs) == 1 {
return nil, nil, fmt.Errorf("invalid exporter input: Ref and Refs are mutually exclusive")
}
// only one loop
for _, v := range inp.Refs {
ref = v
}
var config []byte
switch len(inp.Refs) {
case 0:
config = inp.Metadata[exptypes.ExporterImageConfigKey]
case 1:
platformsBytes, ok := inp.Metadata[exptypes.ExporterPlatformsKey]
if !ok {
return nil, nil, fmt.Errorf("cannot export image, missing platforms mapping")
}
var p exptypes.Platforms
if err := json.Unmarshal(platformsBytes, &p); err != nil {
return nil, nil, errors.Wrapf(err, "failed to parse platforms passed to exporter")
}
if len(p.Platforms) != len(inp.Refs) {
return nil, nil, errors.Errorf("number of platforms does not match references %d %d", len(p.Platforms), len(inp.Refs))
}
config = inp.Metadata[fmt.Sprintf("%s/%s", exptypes.ExporterImageConfigKey, p.Platforms[0].ID)]
}
var diffs []digest.Digest
if ref != nil {
layersDone := oneOffProgress(ctx, "exporting layers")
if err := ref.Finalize(ctx); err != nil {
return nil, nil, layersDone(err)
}
if err := ref.Extract(ctx, nil); err != nil {
return nil, nil, err
}
diffIDs, err := e.opt.Differ.EnsureLayer(ctx, ref.ID())
if err != nil {
return nil, nil, layersDone(err)
}
diffs = make([]digest.Digest, len(diffIDs))
for i := range diffIDs {
diffs[i] = digest.Digest(diffIDs[i])
}
_ = layersDone(nil)
}
if len(config) == 0 {
var err error
config, err = emptyImageConfig()
if err != nil {
return nil, nil, err
}
}
history, err := parseHistoryFromConfig(config)
if err != nil {
return nil, nil, err
}
diffs, history = normalizeLayersAndHistory(diffs, history, ref)
config, err = patchImageConfig(config, diffs, history, inp.Metadata[exptypes.ExporterInlineCache])
if err != nil {
return nil, nil, err
}
configDigest := digest.FromBytes(config)
configDone := oneOffProgress(ctx, fmt.Sprintf("writing image %s", configDigest))
id, err := e.opt.ImageStore.Create(config)
if err != nil {
return nil, nil, configDone(err)
}
_ = configDone(nil)
if e.opt.ImageTagger != nil {
for _, targetName := range e.targetNames {
tagDone := oneOffProgress(ctx, "naming to "+targetName.String())
if err := e.opt.ImageTagger.TagImage(ctx, image.ID(digest.Digest(id)), targetName); err != nil {
return nil, nil, tagDone(err)
}
_ = tagDone(nil)
}
}
return map[string]string{
exptypes.ExporterImageConfigDigestKey: configDigest.String(),
exptypes.ExporterImageDigestKey: id.String(),
}, nil, nil
}