func convertPorts(dockerExposedPorts map[string]struct{}, dockerPortSpecs []string, debug log.Logger) ([]appctypes.Port, error) {
ports := []appctypes.Port{}
for ep := range dockerExposedPorts {
appcPort, err := parseDockerPort(ep)
if err != nil {
return nil, err
}
ports = append(ports, *appcPort)
}
if dockerExposedPorts == nil && dockerPortSpecs != nil {
debug.Println("warning: docker image uses deprecated PortSpecs field")
for _, ep := range dockerPortSpecs {
appcPort, err := parseDockerPort(ep)
if err != nil {
return nil, err
}
ports = append(ports, *appcPort)
}
}
sort.Sort(appcPortSorter(ports))
return ports, nil
}
func getParent(file *os.File, imgID string, debug log.Logger) (string, error) {
var parent string
_, err := file.Seek(0, 0)
if err != nil {
return "", fmt.Errorf("error seeking file: %v", err)
}
jsonPath := filepath.Join(imgID, "json")
parentWalker := func(t *tarball.TarFile) error {
if filepath.Clean(t.Name()) == jsonPath {
jsonb, err := ioutil.ReadAll(t.TarStream)
if err != nil {
return fmt.Errorf("error reading layer json: %v", err)
}
var dockerData types.DockerImageData
if err := json.Unmarshal(jsonb, &dockerData); err != nil {
return fmt.Errorf("error unmarshaling layer data: %v", err)
}
parent = dockerData.Parent
}
return nil
}
tr := tar.NewReader(file)
if err := tarball.Walk(*tr, parentWalker); err != nil {
return "", err
}
debug.Printf("Layer %q depends on layer %q", imgID, parent)
return parent, nil
}
func extractEmbeddedLayer(file *os.File, layerTarPath string, outputPath string, info log.Logger) (*os.File, error) {
info.Println("Extracting ", layerTarPath)
_, err := file.Seek(0, 0)
if err != nil {
return nil, fmt.Errorf("error seeking file: %v", err)
}
var layerFile *os.File
fileWalker := func(t *tarball.TarFile) error {
if filepath.Clean(t.Name()) == layerTarPath {
layerFile, err = os.Create(outputPath)
if err != nil {
return fmt.Errorf("error creating layer: %v", err)
}
_, err = io.Copy(layerFile, t.TarStream)
if err != nil {
return fmt.Errorf("error getting layer: %v", err)
}
}
return nil
}
tr := tar.NewReader(file)
if err := tarball.Walk(*tr, fileWalker); err != nil {
return nil, err
}
if layerFile == nil {
return nil, fmt.Errorf("file %q not found", layerTarPath)
}
return layerFile, nil
}
// squashLayers receives a list of ACI layer file names ordered from base image
// to application image and squashes them into one ACI
func squashLayers(images []acirenderer.Image, aciRegistry acirenderer.ACIRegistry, parsedDockerURL common.ParsedDockerURL, outputDir string, compression common.Compression, debug log.Logger) (path string, err error) {
debug.Println("Squashing layers...")
debug.Println("Rendering ACI...")
renderedACI, err := acirenderer.GetRenderedACIFromList(images, aciRegistry)
if err != nil {
return "", fmt.Errorf("error rendering squashed image: %v", err)
}
manifests, err := getManifests(renderedACI, aciRegistry)
if err != nil {
return "", fmt.Errorf("error getting manifests: %v", err)
}
squashedFilename := getSquashedFilename(parsedDockerURL)
squashedImagePath := filepath.Join(outputDir, squashedFilename)
squashedTempFile, err := ioutil.TempFile(outputDir, "docker2aci-squashedFile-")
if err != nil {
return "", err
}
defer func() {
if err == nil {
err = squashedTempFile.Close()
} else {
// remove temp file on error
// we ignore its error to not mask the real error
os.Remove(squashedTempFile.Name())
}
}()
debug.Println("Writing squashed ACI...")
if err := writeSquashedImage(squashedTempFile, renderedACI, aciRegistry, manifests, compression); err != nil {
return "", fmt.Errorf("error writing squashed image: %v", err)
}
debug.Println("Validating squashed ACI...")
if err := internal.ValidateACI(squashedTempFile.Name()); err != nil {
return "", fmt.Errorf("error validating image: %v", err)
}
if err := os.Rename(squashedTempFile.Name(), squashedImagePath); err != nil {
return "", err
}
debug.Println("ACI squashed!")
return squashedImagePath, nil
}
// getAncestry computes an image ancestry, returning an ordered list
// of dependencies starting from the topmost image to the base.
// It checks for dependency loops via duplicate detection in the image
// chain and errors out in such cases.
func getAncestry(file *os.File, imgID string, debug log.Logger) ([]string, error) {
var ancestry []string
deps := make(map[string]bool)
curImgID := imgID
var err error
for curImgID != "" {
if deps[curImgID] {
return nil, fmt.Errorf("dependency loop detected at image %q", curImgID)
}
deps[curImgID] = true
ancestry = append(ancestry, curImgID)
debug.Printf("Getting ancestry for layer %q", curImgID)
curImgID, err = getParent(file, curImgID, debug)
if err != nil {
return nil, err
}
}
return ancestry, nil
}
func getImageID(file *os.File, dockerURL *common.ParsedDockerURL, name string, debug log.Logger) (string, []string, *common.ParsedDockerURL, error) {
debug.Println("getting image id...")
type tags map[string]string
type apps map[string]tags
_, err := file.Seek(0, 0)
if err != nil {
return "", nil, nil, fmt.Errorf("error seeking file: %v", err)
}
tag := "latest"
if dockerURL != nil {
tag = dockerURL.Tag
}
var imageID string
var ancestry []string
var appName string
reposWalker := func(t *tarball.TarFile) error {
clean := filepath.Clean(t.Name())
if clean == "repositories" {
repob, err := ioutil.ReadAll(t.TarStream)
if err != nil {
return fmt.Errorf("error reading repositories file: %v", err)
}
var repositories apps
if err := json.Unmarshal(repob, &repositories); err != nil {
return fmt.Errorf("error unmarshaling repositories file")
}
if dockerURL == nil {
n := len(repositories)
switch {
case n == 1:
for key, _ := range repositories {
appName = key
}
case n > 1:
var appNames []string
for key, _ := range repositories {
appNames = append(appNames, key)
}
return &common.ErrSeveralImages{
Msg: "several images found",
Images: appNames,
}
default:
return fmt.Errorf("no images found")
}
} else {
appName = dockerURL.ImageName
}
app, ok := repositories[appName]
if !ok {
return fmt.Errorf("app %q not found", appName)
}
_, ok = app[tag]
if !ok {
if len(app) == 1 {
for key, _ := range app {
tag = key
}
} else {
return fmt.Errorf("tag %q not found", tag)
}
}
if dockerURL == nil {
dockerURL = &common.ParsedDockerURL{
OriginalName: "",
IndexURL: "",
Tag: tag,
ImageName: appName,
}
}
imageID = string(app[tag])
}
if clean == "refs/"+tag {
refb, err := ioutil.ReadAll(t.TarStream)
if err != nil {
return fmt.Errorf("error reading ref descriptor for tag %s: %v", tag, err)
}
if dockerURL == nil {
dockerURL = &common.ParsedDockerURL{
IndexURL: "",
Tag: tag,
ImageName: name,
}
}
var ref spec.Descriptor
if err := json.Unmarshal(refb, &ref); err != nil {
return fmt.Errorf("error unmarshaling ref descriptor for tag %s", tag)
}
imageID, ancestry, err = getDataFromManifest(file, ref.Digest)
if err != nil {
return err
}
return io.EOF
}
return nil
}
tr := tar.NewReader(file)
if err := tarball.Walk(*tr, reposWalker); err != nil && err != io.EOF {
return "", nil, nil, err
}
if imageID == "" {
return "", nil, nil, fmt.Errorf("Could not find image")
}
return imageID, ancestry, dockerURL, nil
}
