271 lines
7.7 KiB
Go
271 lines
7.7 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package local
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import (
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"context"
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"fmt"
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"github.com/containerd/containerd"
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"github.com/containerd/containerd/content"
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"github.com/containerd/containerd/errdefs"
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"github.com/containerd/containerd/images"
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"github.com/containerd/containerd/log"
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"github.com/containerd/containerd/pkg/transfer"
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"github.com/containerd/containerd/pkg/unpack"
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"github.com/containerd/containerd/remotes"
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"github.com/containerd/containerd/remotes/docker"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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func (ts *localTransferService) pull(ctx context.Context, ir transfer.ImageFetcher, is transfer.ImageStorer, tops *transfer.Config) error {
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ctx, done, err := ts.withLease(ctx)
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if err != nil {
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return err
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}
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defer done(ctx)
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if tops.Progress != nil {
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tops.Progress(transfer.Progress{
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Event: fmt.Sprintf("Resolving from %s", ir),
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})
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}
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name, desc, err := ir.Resolve(ctx)
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if err != nil {
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return fmt.Errorf("failed to resolve image: %w", err)
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}
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if desc.MediaType == images.MediaTypeDockerSchema1Manifest {
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// Explicitly call out schema 1 as deprecated and not supported
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return fmt.Errorf("schema 1 image manifests are no longer supported: %w", errdefs.ErrInvalidArgument)
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}
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// TODO: Handle already exists
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if tops.Progress != nil {
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tops.Progress(transfer.Progress{
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Event: fmt.Sprintf("Pulling from %s", ir),
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})
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tops.Progress(transfer.Progress{
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Event: "fetching image content",
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Name: name,
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//Digest: img.Target.Digest.String(),
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})
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}
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fetcher, err := ir.Fetcher(ctx, name)
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if err != nil {
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return fmt.Errorf("failed to get fetcher for %q: %w", name, err)
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}
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var (
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handler images.Handler
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baseHandlers []images.Handler
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unpacker *unpack.Unpacker
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// has a config media type bug (distribution#1622)
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hasMediaTypeBug1622 bool
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store = ts.content
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progressTracker *ProgressTracker
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)
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ctx, cancel := context.WithCancel(ctx)
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if tops.Progress != nil {
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progressTracker = NewProgressTracker(name, "downloading") //Pass in first name as root
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go progressTracker.HandleProgress(ctx, tops.Progress, NewContentStatusTracker(store))
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defer progressTracker.Wait()
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}
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defer cancel()
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// Get all the children for a descriptor
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childrenHandler := images.ChildrenHandler(store)
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if f, ok := is.(transfer.ImageFilterer); ok {
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childrenHandler = f.ImageFilter(childrenHandler, store)
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}
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checkNeedsFix := images.HandlerFunc(
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func(_ context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
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// set to true if there is application/octet-stream media type
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if desc.MediaType == docker.LegacyConfigMediaType {
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hasMediaTypeBug1622 = true
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}
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return []ocispec.Descriptor{}, nil
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},
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)
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appendDistSrcLabelHandler, err := docker.AppendDistributionSourceLabel(store, name)
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if err != nil {
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return err
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}
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//Set up baseHandlers from service configuration if present or create a new one
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if ts.config.BaseHandlers != nil {
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baseHandlers = ts.config.BaseHandlers
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} else {
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baseHandlers = []images.Handler{}
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}
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if tops.Progress != nil {
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baseHandlers = append(baseHandlers, images.HandlerFunc(
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func(_ context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
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progressTracker.Add(desc)
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return []ocispec.Descriptor{}, nil
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},
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))
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baseChildrenHandler := childrenHandler
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childrenHandler = images.HandlerFunc(func(ctx context.Context, desc ocispec.Descriptor) (children []ocispec.Descriptor, err error) {
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children, err = baseChildrenHandler(ctx, desc)
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if err != nil {
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return
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}
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progressTracker.AddChildren(desc, children)
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return
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})
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}
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handler = images.Handlers(append(baseHandlers,
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fetchHandler(store, fetcher, progressTracker),
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checkNeedsFix,
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childrenHandler, // List children to track hierarchy
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appendDistSrcLabelHandler,
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)...)
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// First find suitable platforms to unpack into
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//If image storer is also an unpacker type, i.e implemented UnpackPlatforms() func
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if iu, ok := is.(transfer.ImageUnpacker); ok {
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unpacks := iu.UnpackPlatforms()
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if len(unpacks) > 0 {
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uopts := []unpack.UnpackerOpt{}
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//Only unpack if requested unpackconfig matches default/supported unpackconfigs
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for _, u := range unpacks {
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matched, mu := getSupportedPlatform(u, ts.config.UnpackPlatforms)
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if matched {
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uopts = append(uopts, unpack.WithUnpackPlatform(mu))
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}
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}
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if ts.limiterD != nil {
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uopts = append(uopts, unpack.WithLimiter(ts.limiterD))
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}
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if ts.config.DuplicationSuppressor != nil {
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uopts = append(uopts, unpack.WithDuplicationSuppressor(ts.config.DuplicationSuppressor))
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}
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unpacker, err = unpack.NewUnpacker(ctx, ts.content, uopts...)
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if err != nil {
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return fmt.Errorf("unable to initialize unpacker: %w", err)
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}
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handler = unpacker.Unpack(handler)
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}
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}
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if err := images.Dispatch(ctx, handler, ts.limiterD, desc); err != nil {
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if unpacker != nil {
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// wait for unpacker to cleanup
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unpacker.Wait()
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}
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return err
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}
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// NOTE(fuweid): unpacker defers blobs download. before create image
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// record in ImageService, should wait for unpacking(including blobs
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// download).
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if unpacker != nil {
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if _, err = unpacker.Wait(); err != nil {
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return err
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}
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// TODO: Check results to make sure unpack was successful
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}
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if hasMediaTypeBug1622 {
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if desc, err = docker.ConvertManifest(ctx, store, desc); err != nil {
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return err
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}
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}
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imgs, err := is.Store(ctx, desc, ts.images)
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if err != nil {
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return err
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}
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if tops.Progress != nil {
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for _, img := range imgs {
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tops.Progress(transfer.Progress{
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Event: "saved",
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Name: img.Name,
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})
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}
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}
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if tops.Progress != nil {
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tops.Progress(transfer.Progress{
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Event: fmt.Sprintf("Completed pull from %s", ir),
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})
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}
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return nil
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}
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func fetchHandler(ingester content.Ingester, fetcher remotes.Fetcher, pt *ProgressTracker) images.HandlerFunc {
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return func(ctx context.Context, desc ocispec.Descriptor) (subdescs []ocispec.Descriptor, err error) {
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ctx = log.WithLogger(ctx, log.G(ctx).WithFields(log.Fields{
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"digest": desc.Digest,
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"mediatype": desc.MediaType,
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"size": desc.Size,
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}))
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switch desc.MediaType {
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case images.MediaTypeDockerSchema1Manifest:
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return nil, fmt.Errorf("%v not supported", desc.MediaType)
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default:
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err := remotes.Fetch(ctx, ingester, fetcher, desc)
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if errdefs.IsAlreadyExists(err) {
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pt.MarkExists(desc)
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return nil, nil
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}
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return nil, err
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}
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}
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}
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// getSupportedPlatform returns a matched platform comparing input UnpackConfiguration to the supported platform/snapshotter combinations
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// If input platform didn't specify snapshotter, default will be used if there is a match on platform.
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func getSupportedPlatform(uc transfer.UnpackConfiguration, supportedPlatforms []unpack.Platform) (bool, unpack.Platform) {
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var u unpack.Platform
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for _, sp := range supportedPlatforms {
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//If both platform and snapshotter match, return the supportPlatform
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//If platform matched and SnapshotterKey is empty, we assume client didn't pass SnapshotterKey
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//use default Snapshotter
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if sp.Platform.Match(uc.Platform) {
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//assuming sp.SnapshotterKey is not empty
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if uc.Snapshotter == sp.SnapshotterKey {
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return true, sp
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} else if uc.Snapshotter == "" && sp.SnapshotterKey == containerd.DefaultSnapshotter {
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return true, sp
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}
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}
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}
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return false, u
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}
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