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pull.go
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pull.go
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/*
Copyright The containerd Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package containerd
import (
"context"
"errors"
"fmt"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/platforms"
"github.com/containerd/containerd/remotes"
"github.com/containerd/containerd/remotes/docker"
"github.com/containerd/containerd/remotes/docker/schema1"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"golang.org/x/sync/errgroup"
"golang.org/x/sync/semaphore"
)
// Pull downloads the provided content into containerd's content store
// and returns a platform specific image object
func (c *Client) Pull(ctx context.Context, ref string, opts ...RemoteOpt) (_ Image, retErr error) {
pullCtx := defaultRemoteContext()
for _, o := range opts {
if err := o(c, pullCtx); err != nil {
return nil, err
}
}
if pullCtx.PlatformMatcher == nil {
if len(pullCtx.Platforms) > 1 {
return nil, errors.New("cannot pull multiplatform image locally, try Fetch")
} else if len(pullCtx.Platforms) == 0 {
pullCtx.PlatformMatcher = c.platform
} else {
p, err := platforms.Parse(pullCtx.Platforms[0])
if err != nil {
return nil, fmt.Errorf("invalid platform %s: %w", pullCtx.Platforms[0], err)
}
pullCtx.PlatformMatcher = platforms.Only(p)
}
}
ctx, done, err := c.WithLease(ctx)
if err != nil {
return nil, err
}
defer done(ctx)
var unpacks int32
var unpackEg *errgroup.Group
var unpackWrapper func(f images.Handler) images.Handler
if pullCtx.Unpack {
// unpacker only supports schema 2 image, for schema 1 this is noop.
u, err := c.newUnpacker(ctx, pullCtx)
if err != nil {
return nil, fmt.Errorf("create unpacker: %w", err)
}
unpackWrapper, unpackEg = u.handlerWrapper(ctx, pullCtx, &unpacks)
defer func() {
if err := unpackEg.Wait(); err != nil {
if retErr == nil {
retErr = fmt.Errorf("unpack: %w", err)
}
}
}()
wrapper := pullCtx.HandlerWrapper
pullCtx.HandlerWrapper = func(h images.Handler) images.Handler {
if wrapper == nil {
return unpackWrapper(h)
}
return unpackWrapper(wrapper(h))
}
}
img, err := c.fetch(ctx, pullCtx, ref, 1)
if err != nil {
return nil, err
}
// NOTE(fuweid): unpacker defers blobs download. before create image
// record in ImageService, should wait for unpacking(including blobs
// download).
if pullCtx.Unpack {
if unpackEg != nil {
if err := unpackEg.Wait(); err != nil {
return nil, err
}
}
}
img, err = c.createNewImage(ctx, img)
if err != nil {
return nil, err
}
i := NewImageWithPlatform(c, img, pullCtx.PlatformMatcher)
if pullCtx.Unpack {
if unpacks == 0 {
// Try to unpack is none is done previously.
// This is at least required for schema 1 image.
if err := i.Unpack(ctx, pullCtx.Snapshotter, pullCtx.UnpackOpts...); err != nil {
return nil, fmt.Errorf("failed to unpack image on snapshotter %s: %w", pullCtx.Snapshotter, err)
}
}
}
return i, nil
}
func (c *Client) fetch(ctx context.Context, rCtx *RemoteContext, ref string, limit int) (images.Image, error) {
store := c.ContentStore()
name, desc, err := rCtx.Resolver.Resolve(ctx, ref)
if err != nil {
return images.Image{}, fmt.Errorf("failed to resolve reference %q: %w", ref, err)
}
fetcher, err := rCtx.Resolver.Fetcher(ctx, name)
if err != nil {
return images.Image{}, fmt.Errorf("failed to get fetcher for %q: %w", name, err)
}
var (
handler images.Handler
isConvertible bool
converterFunc func(context.Context, ocispec.Descriptor) (ocispec.Descriptor, error)
limiter *semaphore.Weighted
)
if desc.MediaType == images.MediaTypeDockerSchema1Manifest && rCtx.ConvertSchema1 {
schema1Converter := schema1.NewConverter(store, fetcher)
handler = images.Handlers(append(rCtx.BaseHandlers, schema1Converter)...)
isConvertible = true
converterFunc = func(ctx context.Context, _ ocispec.Descriptor) (ocispec.Descriptor, error) {
return schema1Converter.Convert(ctx)
}
} else {
// Get all the children for a descriptor
childrenHandler := images.ChildrenHandler(store)
// Set any children labels for that content
childrenHandler = images.SetChildrenMappedLabels(store, childrenHandler, rCtx.ChildLabelMap)
if rCtx.AllMetadata {
// Filter manifests by platforms but allow to handle manifest
// and configuration for not-target platforms
childrenHandler = remotes.FilterManifestByPlatformHandler(childrenHandler, rCtx.PlatformMatcher)
} else {
// Filter children by platforms if specified.
childrenHandler = images.FilterPlatforms(childrenHandler, rCtx.PlatformMatcher)
}
// Sort and limit manifests if a finite number is needed
if limit > 0 {
childrenHandler = images.LimitManifests(childrenHandler, rCtx.PlatformMatcher, limit)
}
// set isConvertible to true if there is application/octet-stream media type
convertibleHandler := images.HandlerFunc(
func(_ context.Context, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
if desc.MediaType == docker.LegacyConfigMediaType {
isConvertible = true
}
return []ocispec.Descriptor{}, nil
},
)
appendDistSrcLabelHandler, err := docker.AppendDistributionSourceLabel(store, ref)
if err != nil {
return images.Image{}, err
}
handlers := append(rCtx.BaseHandlers,
remotes.FetchHandler(store, fetcher),
convertibleHandler,
childrenHandler,
appendDistSrcLabelHandler,
)
handler = images.Handlers(handlers...)
converterFunc = func(ctx context.Context, desc ocispec.Descriptor) (ocispec.Descriptor, error) {
return docker.ConvertManifest(ctx, store, desc)
}
}
if rCtx.HandlerWrapper != nil {
handler = rCtx.HandlerWrapper(handler)
}
if rCtx.MaxConcurrentDownloads > 0 {
limiter = semaphore.NewWeighted(int64(rCtx.MaxConcurrentDownloads))
}
if err := images.Dispatch(ctx, handler, limiter, desc); err != nil {
return images.Image{}, err
}
if isConvertible {
if desc, err = converterFunc(ctx, desc); err != nil {
return images.Image{}, err
}
}
return images.Image{
Name: name,
Target: desc,
Labels: rCtx.Labels,
}, nil
}
func (c *Client) createNewImage(ctx context.Context, img images.Image) (images.Image, error) {
is := c.ImageService()
for {
if created, err := is.Create(ctx, img); err != nil {
if !errdefs.IsAlreadyExists(err) {
return images.Image{}, err
}
updated, err := is.Update(ctx, img)
if err != nil {
// if image was removed, try create again
if errdefs.IsNotFound(err) {
continue
}
return images.Image{}, err
}
img = updated
} else {
img = created
}
return img, nil
}
}