package image import ( "context" "fmt" "io" "path/filepath" "strings" cp "github.com/containers/image/copy" "github.com/containers/image/directory" "github.com/containers/image/docker" dockerarchive "github.com/containers/image/docker/archive" "github.com/containers/image/docker/tarfile" ociarchive "github.com/containers/image/oci/archive" is "github.com/containers/image/storage" "github.com/containers/image/transports" "github.com/containers/image/transports/alltransports" "github.com/containers/image/types" "github.com/containers/libpod/libpod/events" "github.com/containers/libpod/pkg/registries" "github.com/hashicorp/go-multierror" "github.com/opentracing/opentracing-go" "github.com/pkg/errors" "github.com/sirupsen/logrus" ) var ( // DockerArchive is the transport we prepend to an image name // when saving to docker-archive DockerArchive = dockerarchive.Transport.Name() // OCIArchive is the transport we prepend to an image name // when saving to oci-archive OCIArchive = ociarchive.Transport.Name() // DirTransport is the transport for pushing and pulling // images to and from a directory DirTransport = directory.Transport.Name() // DockerTransport is the transport for docker registries DockerTransport = docker.Transport.Name() // AtomicTransport is the transport for atomic registries AtomicTransport = "atomic" // DefaultTransport is a prefix that we apply to an image name // NOTE: This is a string prefix, not actually a transport name usable for transports.Get(); // and because syntaxes of image names are transport-dependent, the prefix is not really interchangeable; // each user implicitly assumes the appended string is a Docker-like reference. DefaultTransport = DockerTransport + "://" // DefaultLocalRegistry is the default local registry for local image operations // Remote pulls will still use defined registries DefaultLocalRegistry = "localhost" ) // pullRefPair records a pair of prepared image references to pull. type pullRefPair struct { image string srcRef types.ImageReference dstRef types.ImageReference } // pullGoal represents the prepared image references and decided behavior to be executed by imagePull type pullGoal struct { refPairs []pullRefPair pullAllPairs bool // Pull all refPairs instead of stopping on first success. usedSearchRegistries bool // refPairs construction has depended on registries.GetRegistries() searchedRegistries []string // The list of search registries used; set only if usedSearchRegistries } // singlePullRefPairGoal returns a no-frills pull goal for the specified reference pair. func singlePullRefPairGoal(rp pullRefPair) *pullGoal { return &pullGoal{ refPairs: []pullRefPair{rp}, pullAllPairs: false, // Does not really make a difference. usedSearchRegistries: false, searchedRegistries: nil, } } func (ir *Runtime) getPullRefPair(srcRef types.ImageReference, destName string) (pullRefPair, error) { decomposedDest, err := decompose(destName) if err == nil && !decomposedDest.hasRegistry { // If the image doesn't have a registry, set it as the default repo ref, err := decomposedDest.referenceWithRegistry(DefaultLocalRegistry) if err != nil { return pullRefPair{}, err } destName = ref.String() } reference := destName if srcRef.DockerReference() != nil { reference = srcRef.DockerReference().String() } destRef, err := is.Transport.ParseStoreReference(ir.store, reference) if err != nil { return pullRefPair{}, errors.Wrapf(err, "error parsing dest reference name %#v", destName) } return pullRefPair{ image: destName, srcRef: srcRef, dstRef: destRef, }, nil } // getSinglePullRefPairGoal calls getPullRefPair with the specified parameters, and returns a single-pair goal for the return value. func (ir *Runtime) getSinglePullRefPairGoal(srcRef types.ImageReference, destName string) (*pullGoal, error) { rp, err := ir.getPullRefPair(srcRef, destName) if err != nil { return nil, err } return singlePullRefPairGoal(rp), nil } // pullGoalFromImageReference returns a pull goal for a single ImageReference, depending on the used transport. func (ir *Runtime) pullGoalFromImageReference(ctx context.Context, srcRef types.ImageReference, imgName string, sc *types.SystemContext) (*pullGoal, error) { span, _ := opentracing.StartSpanFromContext(ctx, "pullGoalFromImageReference") defer span.Finish() // supports pulling from docker-archive, oci, and registries switch srcRef.Transport().Name() { case DockerArchive: archivePath := srcRef.StringWithinTransport() tarSource, err := tarfile.NewSourceFromFile(archivePath) if err != nil { return nil, err } manifest, err := tarSource.LoadTarManifest() if err != nil { return nil, errors.Wrapf(err, "error retrieving manifest.json") } // to pull the first image stored in the tar file if len(manifest) == 0 { // use the hex of the digest if no manifest is found reference, err := getImageDigest(ctx, srcRef, sc) if err != nil { return nil, err } return ir.getSinglePullRefPairGoal(srcRef, reference) } if len(manifest[0].RepoTags) == 0 { // If the input image has no repotags, we need to feed it a dest anyways digest, err := getImageDigest(ctx, srcRef, sc) if err != nil { return nil, err } return ir.getSinglePullRefPairGoal(srcRef, digest) } // Need to load in all the repo tags from the manifest res := []pullRefPair{} for _, dst := range manifest[0].RepoTags { //check if image exists and gives a warning of untagging localImage, err := ir.NewFromLocal(dst) imageID := strings.TrimSuffix(manifest[0].Config, ".json") if err == nil && imageID != localImage.ID() { logrus.Errorf("the image %s already exists, renaming the old one with ID %s to empty string", dst, localImage.ID()) } pullInfo, err := ir.getPullRefPair(srcRef, dst) if err != nil { return nil, err } res = append(res, pullInfo) } return &pullGoal{ refPairs: res, pullAllPairs: true, usedSearchRegistries: false, searchedRegistries: nil, }, nil case OCIArchive: // retrieve the manifest from index.json to access the image name manifest, err := ociarchive.LoadManifestDescriptor(srcRef) if err != nil { return nil, errors.Wrapf(err, "error loading manifest for %q", srcRef) } var dest string if manifest.Annotations == nil || manifest.Annotations["org.opencontainers.image.ref.name"] == "" { // If the input image has no image.ref.name, we need to feed it a dest anyways // use the hex of the digest dest, err = getImageDigest(ctx, srcRef, sc) if err != nil { return nil, errors.Wrapf(err, "error getting image digest; image reference not found") } } else { dest = manifest.Annotations["org.opencontainers.image.ref.name"] } return ir.getSinglePullRefPairGoal(srcRef, dest) case DirTransport: path := srcRef.StringWithinTransport() image := path if image[:1] == "/" { // Set localhost as the registry so docker.io isn't prepended, and the path becomes the repository image = DefaultLocalRegistry + image } return ir.getSinglePullRefPairGoal(srcRef, image) default: return ir.getSinglePullRefPairGoal(srcRef, imgName) } } // pullImageFromHeuristicSource pulls an image based on inputName, which is heuristically parsed and may involve configured registries. // Use pullImageFromReference if the source is known precisely. func (ir *Runtime) pullImageFromHeuristicSource(ctx context.Context, inputName string, writer io.Writer, authfile, signaturePolicyPath string, signingOptions SigningOptions, dockerOptions *DockerRegistryOptions, label *string) ([]string, error) { span, _ := opentracing.StartSpanFromContext(ctx, "pullImageFromHeuristicSource") defer span.Finish() var goal *pullGoal sc := GetSystemContext(signaturePolicyPath, authfile, false) sc.BlobInfoCacheDir = filepath.Join(ir.store.GraphRoot(), "cache") srcRef, err := alltransports.ParseImageName(inputName) if err != nil { // could be trying to pull from registry with short name goal, err = ir.pullGoalFromPossiblyUnqualifiedName(inputName) if err != nil { return nil, errors.Wrap(err, "error getting default registries to try") } } else { goal, err = ir.pullGoalFromImageReference(ctx, srcRef, inputName, sc) if err != nil { return nil, errors.Wrapf(err, "error determining pull goal for image %q", inputName) } } return ir.doPullImage(ctx, sc, *goal, writer, signingOptions, dockerOptions, label) } // pullImageFromReference pulls an image from a types.imageReference. func (ir *Runtime) pullImageFromReference(ctx context.Context, srcRef types.ImageReference, writer io.Writer, authfile, signaturePolicyPath string, signingOptions SigningOptions, dockerOptions *DockerRegistryOptions) ([]string, error) { span, _ := opentracing.StartSpanFromContext(ctx, "pullImageFromReference") defer span.Finish() sc := GetSystemContext(signaturePolicyPath, authfile, false) goal, err := ir.pullGoalFromImageReference(ctx, srcRef, transports.ImageName(srcRef), sc) if err != nil { return nil, errors.Wrapf(err, "error determining pull goal for image %q", transports.ImageName(srcRef)) } return ir.doPullImage(ctx, sc, *goal, writer, signingOptions, dockerOptions, nil) } // doPullImage is an internal helper interpreting pullGoal. Almost everyone should call one of the callers of doPullImage instead. func (ir *Runtime) doPullImage(ctx context.Context, sc *types.SystemContext, goal pullGoal, writer io.Writer, signingOptions SigningOptions, dockerOptions *DockerRegistryOptions, label *string) ([]string, error) { span, _ := opentracing.StartSpanFromContext(ctx, "doPullImage") defer span.Finish() policyContext, err := getPolicyContext(sc) if err != nil { return nil, err } defer func() { if err := policyContext.Destroy(); err != nil { logrus.Errorf("failed to destroy policy context: %q", err) } }() systemRegistriesConfPath := registries.SystemRegistriesConfPath() var ( images []string pullErrors *multierror.Error ) for _, imageInfo := range goal.refPairs { copyOptions := getCopyOptions(sc, writer, dockerOptions, nil, signingOptions, "", nil) copyOptions.SourceCtx.SystemRegistriesConfPath = systemRegistriesConfPath // FIXME: Set this more globally. Probably no reason not to have it in every types.SystemContext, and to compute the value just once in one place. // Print the following statement only when pulling from a docker or atomic registry if writer != nil && (imageInfo.srcRef.Transport().Name() == DockerTransport || imageInfo.srcRef.Transport().Name() == AtomicTransport) { if _, err := io.WriteString(writer, fmt.Sprintf("Trying to pull %s...", imageInfo.image)); err != nil { return nil, err } } // If the label is not nil, check if the label exists and if not, return err if label != nil { if err := checkRemoteImageForLabel(ctx, *label, imageInfo, sc); err != nil { return nil, err } } _, err = cp.Image(ctx, policyContext, imageInfo.dstRef, imageInfo.srcRef, copyOptions) if err != nil { pullErrors = multierror.Append(pullErrors, err) logrus.Errorf("Error pulling image ref %s: %v", imageInfo.srcRef.StringWithinTransport(), err) if writer != nil { _, _ = io.WriteString(writer, "Failed\n") } } else { if !goal.pullAllPairs { ir.newImageEvent(events.Pull, "") return []string{imageInfo.image}, nil } images = append(images, imageInfo.image) } } // If no image was found, we should handle. Lets be nicer to the user and see if we can figure out why. if len(images) == 0 { if goal.usedSearchRegistries && len(goal.searchedRegistries) == 0 { return nil, errors.Errorf("image name provided is a short name and no search registries are defined in the registries config file.") } // If the image passed in was fully-qualified, we will have 1 refpair. Bc the image is fq'd, we dont need to yap about registries. if !goal.usedSearchRegistries { if pullErrors != nil && len(pullErrors.Errors) > 0 { // this should always be true return nil, errors.Wrap(pullErrors.Errors[0], "unable to pull image") } return nil, errors.Errorf("unable to pull image, or you do not have pull access") } return nil, pullErrors } if len(images) > 0 { ir.newImageEvent(events.Pull, images[0]) } return images, nil } // pullGoalFromPossiblyUnqualifiedName looks at inputName and determines the possible // image references to try pulling in combination with the registries.conf file as well func (ir *Runtime) pullGoalFromPossiblyUnqualifiedName(inputName string) (*pullGoal, error) { decomposedImage, err := decompose(inputName) if err != nil { return nil, err } if decomposedImage.hasRegistry { srcRef, err := docker.ParseReference("//" + inputName) if err != nil { return nil, errors.Wrapf(err, "unable to parse '%s'", inputName) } return ir.getSinglePullRefPairGoal(srcRef, inputName) } searchRegistries, err := registries.GetRegistries() if err != nil { return nil, err } var refPairs []pullRefPair for _, registry := range searchRegistries { ref, err := decomposedImage.referenceWithRegistry(registry) if err != nil { return nil, err } imageName := ref.String() srcRef, err := docker.ParseReference("//" + imageName) if err != nil { return nil, errors.Wrapf(err, "unable to parse '%s'", imageName) } ps, err := ir.getPullRefPair(srcRef, imageName) if err != nil { return nil, err } refPairs = append(refPairs, ps) } return &pullGoal{ refPairs: refPairs, pullAllPairs: false, usedSearchRegistries: true, searchedRegistries: searchRegistries, }, nil } // checkRemoteImageForLabel checks if the remote image has a specific label. if the label exists, we // return nil, else we return an error func checkRemoteImageForLabel(ctx context.Context, label string, imageInfo pullRefPair, sc *types.SystemContext) error { labelImage, err := imageInfo.srcRef.NewImage(ctx, sc) if err != nil { return err } remoteInspect, err := labelImage.Inspect(ctx) if err != nil { return err } // Labels are case insensitive; so we iterate instead of simple lookup for k := range remoteInspect.Labels { if strings.ToLower(label) == strings.ToLower(k) { return nil } } return errors.Errorf("%s has no label %s", imageInfo.image, label) }