func (lb *FileBackend) BuildACI(layerIDs []string, dockerURL *types.ParsedDockerURL, outputDir string, tmpBaseDir string, compression common.Compression) ([]string, []*schema.ImageManifest, error) {
if strings.Contains(layerIDs[0], ":") {
return lb.BuildACIV22(layerIDs, dockerURL, outputDir, tmpBaseDir, compression)
}
var aciLayerPaths []string
var aciManifests []*schema.ImageManifest
var curPwl []string
tmpDir, err := ioutil.TempDir(tmpBaseDir, "docker2aci-")
if err != nil {
return nil, nil, fmt.Errorf("error creating dir: %v", err)
}
defer os.RemoveAll(tmpDir)
for i := len(layerIDs) - 1; i >= 0; i-- {
if err := common.ValidateLayerId(layerIDs[i]); err != nil {
return nil, nil, err
}
j, err := getJson(lb.file, layerIDs[i])
if err != nil {
return nil, nil, fmt.Errorf("error getting layer json: %v", err)
}
layerData := types.DockerImageData{}
if err := json.Unmarshal(j, &layerData); err != nil {
return nil, nil, fmt.Errorf("error unmarshaling layer data: %v", err)
}
tmpLayerPath := path.Join(tmpDir, layerIDs[i])
tmpLayerPath += ".tar"
layerTarPath := path.Join(layerIDs[i], "layer.tar")
layerFile, err := extractEmbeddedLayer(lb.file, layerTarPath, tmpLayerPath)
if err != nil {
return nil, nil, fmt.Errorf("error getting layer from file: %v", err)
}
defer layerFile.Close()
log.Debug("Generating layer ACI...")
aciPath, manifest, err := internal.GenerateACI(i, layerData, dockerURL, outputDir, layerFile, curPwl, compression)
if err != nil {
return nil, nil, fmt.Errorf("error generating ACI: %v", err)
}
aciLayerPaths = append(aciLayerPaths, aciPath)
aciManifests = append(aciManifests, manifest)
curPwl = manifest.PathWhitelist
}
return aciLayerPaths, aciManifests, nil
}
func fixManifestLayers(manifest *v2Manifest) error {
type imageV1 struct {
ID string
Parent string
}
imgs := make([]*imageV1, len(manifest.FSLayers))
for i := range manifest.FSLayers {
img := &imageV1{}
if err := json.Unmarshal([]byte(manifest.History[i].V1Compatibility), img); err != nil {
return err
}
imgs[i] = img
if err := common.ValidateLayerId(img.ID); err != nil {
return err
}
}
if imgs[len(imgs)-1].Parent != "" {
return errors.New("Invalid parent ID in the base layer of the image.")
}
// check general duplicates to error instead of a deadlock
idmap := make(map[string]struct{})
var lastID string
for _, img := range imgs {
// skip IDs that appear after each other, we handle those later
if _, exists := idmap[img.ID]; img.ID != lastID && exists {
return fmt.Errorf("ID %+v appears multiple times in manifest", img.ID)
}
lastID = img.ID
idmap[lastID] = struct{}{}
}
// backwards loop so that we keep the remaining indexes after removing items
for i := len(imgs) - 2; i >= 0; i-- {
if imgs[i].ID == imgs[i+1].ID { // repeated ID. remove and continue
manifest.FSLayers = append(manifest.FSLayers[:i], manifest.FSLayers[i+1:]...)
manifest.History = append(manifest.History[:i], manifest.History[i+1:]...)
} else if imgs[i].Parent != imgs[i+1].ID {
return fmt.Errorf("Invalid parent ID. Expected %v, got %v.", imgs[i+1].ID, imgs[i].Parent)
}
}
return nil
}
func (rb *RepositoryBackend) buildACIV1(layerIDs []string, dockerURL *common.ParsedDockerURL, outputDir string, tmpBaseDir string, compression common.Compression) ([]string, []*schema.ImageManifest, error) {
layerFiles := make([]*os.File, len(layerIDs))
layerDatas := make([]types.DockerImageData, len(layerIDs))
tmpParentDir, err := ioutil.TempDir(tmpBaseDir, "docker2aci-")
if err != nil {
return nil, nil, err
}
defer os.RemoveAll(tmpParentDir)
var doneChannels []chan error
for i, layerID := range layerIDs {
if err := common.ValidateLayerId(layerID); err != nil {
return nil, nil, err
}
doneChan := make(chan error)
doneChannels = append(doneChannels, doneChan)
// https://github.com/golang/go/wiki/CommonMistakes
i := i // golang--
layerID := layerID
go func() {
tmpDir, err := ioutil.TempDir(tmpParentDir, "")
if err != nil {
doneChan <- fmt.Errorf("error creating dir: %v", err)
return
}
j, size, err := rb.getJsonV1(layerID, rb.repoData.Endpoints[0], rb.repoData)
if err != nil {
doneChan <- fmt.Errorf("error getting image json: %v", err)
return
}
layerDatas[i] = types.DockerImageData{}
if err := json.Unmarshal(j, &layerDatas[i]); err != nil {
doneChan <- fmt.Errorf("error unmarshaling layer data: %v", err)
return
}
layerFiles[i], err = rb.getLayerV1(layerID, rb.repoData.Endpoints[0], rb.repoData, size, tmpDir)
if err != nil {
doneChan <- fmt.Errorf("error getting the remote layer: %v", err)
return
}
doneChan <- nil
}()
}
for _, doneChan := range doneChannels {
err := <-doneChan
if err != nil {
return nil, nil, err
}
}
var aciLayerPaths []string
var aciManifests []*schema.ImageManifest
var curPwl []string
for i := len(layerIDs) - 1; i >= 0; i-- {
rb.debug.Println("Generating layer ACI...")
aciPath, manifest, err := internal.GenerateACI(i, layerDatas[i], dockerURL, outputDir, layerFiles[i], curPwl, compression, rb.debug)
if err != nil {
return nil, nil, fmt.Errorf("error generating ACI: %v", err)
}
aciLayerPaths = append(aciLayerPaths, aciPath)
aciManifests = append(aciManifests, manifest)
curPwl = manifest.PathWhitelist
layerFiles[i].Close()
}
return aciLayerPaths, aciManifests, nil
}
func (rb *RepositoryBackend) buildACIV21(layerIDs []string, dockerURL *common.ParsedDockerURL, outputDir string, tmpBaseDir string, compression common.Compression) ([]string, []*schema.ImageManifest, error) {
layerFiles := make([]*os.File, len(layerIDs))
layerDatas := make([]types.DockerImageData, len(layerIDs))
tmpParentDir, err := ioutil.TempDir(tmpBaseDir, "docker2aci-")
if err != nil {
return nil, nil, err
}
defer os.RemoveAll(tmpParentDir)
copier := progressutil.NewCopyProgressPrinter()
var errChannels []chan error
closers := make([]io.ReadCloser, len(layerIDs))
var wg sync.WaitGroup
for i, layerID := range layerIDs {
if err := common.ValidateLayerId(layerID); err != nil {
return nil, nil, err
}
wg.Add(1)
errChan := make(chan error, 1)
errChannels = append(errChannels, errChan)
// https://github.com/golang/go/wiki/CommonMistakes
i := i // golang--
layerID := layerID
go func() {
defer wg.Done()
manifest := rb.imageManifests[*dockerURL]
layerIndex, ok := rb.layersIndex[layerID]
if !ok {
errChan <- fmt.Errorf("layer not found in manifest: %s", layerID)
return
}
if len(manifest.History) <= layerIndex {
errChan <- fmt.Errorf("history not found for layer %s", layerID)
return
}
layerDatas[i] = types.DockerImageData{}
if err := json.Unmarshal([]byte(manifest.History[layerIndex].V1Compatibility), &layerDatas[i]); err != nil {
errChan <- fmt.Errorf("error unmarshaling layer data: %v", err)
return
}
tmpDir, err := ioutil.TempDir(tmpParentDir, "")
if err != nil {
errChan <- fmt.Errorf("error creating dir: %v", err)
return
}
layerFiles[i], closers[i], err = rb.getLayerV2(layerID, dockerURL, tmpDir, copier)
if err != nil {
errChan <- fmt.Errorf("error getting the remote layer: %v", err)
return
}
errChan <- nil
}()
}
// Need to wait for all of the readers to be added to the copier (which happens during rb.getLayerV2)
wg.Wait()
err = copier.PrintAndWait(os.Stderr, 500*time.Millisecond, nil)
if err != nil {
return nil, nil, err
}
for _, closer := range closers {
if closer != nil {
closer.Close()
}
}
for _, errChan := range errChannels {
err := <-errChan
if err != nil {
return nil, nil, err
}
}
for _, layerFile := range layerFiles {
err := layerFile.Sync()
if err != nil {
return nil, nil, err
}
}
var aciLayerPaths []string
var aciManifests []*schema.ImageManifest
var curPwl []string
for i := len(layerIDs) - 1; i >= 0; i-- {
rb.debug.Println("Generating layer ACI...")
aciPath, aciManifest, err := internal.GenerateACI(i, layerDatas[i], dockerURL, outputDir, layerFiles[i], curPwl, compression, rb.debug)
if err != nil {
return nil, nil, fmt.Errorf("error generating ACI: %v", err)
}
aciLayerPaths = append(aciLayerPaths, aciPath)
aciManifests = append(aciManifests, aciManifest)
curPwl = aciManifest.PathWhitelist
layerFiles[i].Close()
}
return aciLayerPaths, aciManifests, nil
}
func (rb *RepositoryBackend) buildACIV22(layerIDs []string, dockerURL *common.ParsedDockerURL, outputDir string, tmpBaseDir string, compression common.Compression) ([]string, []*schema.ImageManifest, error) {
layerFiles := make([]*os.File, len(layerIDs))
tmpParentDir, err := ioutil.TempDir(tmpBaseDir, "docker2aci-")
if err != nil {
return nil, nil, err
}
defer os.RemoveAll(tmpParentDir)
copier := progressutil.NewCopyProgressPrinter()
resultChan := make(chan layer, len(layerIDs))
for i, layerID := range layerIDs {
if err := common.ValidateLayerId(layerID); err != nil {
return nil, nil, err
}
// https://github.com/golang/go/wiki/CommonMistakes
i := i // golang--
layerID := layerID
go func() {
tmpDir, err := ioutil.TempDir(tmpParentDir, "")
if err != nil {
resultChan <- layer{
index: i,
err: fmt.Errorf("error creating dir: %v", err),
}
return
}
layerFile, closer, err := rb.getLayerV2(layerID, dockerURL, tmpDir, copier)
if err != nil {
resultChan <- layer{
index: i,
err: fmt.Errorf("error getting the remote layer: %v", err),
}
return
}
resultChan <- layer{
index: i,
file: layerFile,
closer: closer,
err: nil,
}
}()
}
var errs []error
for i := 0; i < len(layerIDs); i++ {
res := <-resultChan
if res.closer != nil {
defer res.closer.Close()
}
if res.file != nil {
defer res.file.Close()
}
if res.err != nil {
errs = append(errs, res.err)
}
layerFiles[res.index] = res.file
}
if len(errs) > 0 {
return nil, nil, errs[0]
}
err = copier.PrintAndWait(os.Stderr, 500*time.Millisecond, nil)
if err != nil {
return nil, nil, err
}
for _, layerFile := range layerFiles {
err := layerFile.Sync()
if err != nil {
return nil, nil, err
}
}
var aciLayerPaths []string
var aciManifests []*schema.ImageManifest
var curPwl []string
var i int
for i = 0; i < len(layerIDs)-1; i++ {
rb.debug.Println("Generating layer ACI...")
aciPath, aciManifest, err := internal.GenerateACI22LowerLayer(dockerURL, layerIDs[i], outputDir, layerFiles[i], curPwl, compression)
if err != nil {
return nil, nil, fmt.Errorf("error generating ACI: %v", err)
}
aciLayerPaths = append(aciLayerPaths, aciPath)
aciManifests = append(aciManifests, aciManifest)
curPwl = aciManifest.PathWhitelist
}
rb.debug.Println("Generating layer ACI...")
aciPath, aciManifest, err := internal.GenerateACI22TopLayer(dockerURL, rb.imageConfigs[*dockerURL], layerIDs[i], outputDir, layerFiles[i], curPwl, compression, aciManifests, rb.debug)
if err != nil {
return nil, nil, fmt.Errorf("error generating ACI: %v", err)
}
aciLayerPaths = append(aciLayerPaths, aciPath)
aciManifests = append(aciManifests, aciManifest)
return aciLayerPaths, aciManifests, nil
}