d88de4a34f
This change allows implementations to resolve the location of the actual data using OCI descriptor fields such as MediaType. No OCI descriptor field is written to the store. No change on gRPC API. Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
129 lines
3.2 KiB
Go
129 lines
3.2 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 apply
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import (
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"context"
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"io"
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"io/ioutil"
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"time"
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"github.com/containerd/containerd/archive"
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"github.com/containerd/containerd/archive/compression"
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"github.com/containerd/containerd/content"
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"github.com/containerd/containerd/diff"
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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/mount"
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digest "github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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// NewFileSystemApplier returns an applier which simply mounts
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// and applies diff onto the mounted filesystem.
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func NewFileSystemApplier(cs content.Provider) diff.Applier {
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return &fsApplier{
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store: cs,
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}
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}
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type fsApplier struct {
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store content.Provider
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}
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var emptyDesc = ocispec.Descriptor{}
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// Apply applies the content associated with the provided digests onto the
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// provided mounts. Archive content will be extracted and decompressed if
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// necessary.
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func (s *fsApplier) Apply(ctx context.Context, desc ocispec.Descriptor, mounts []mount.Mount) (d ocispec.Descriptor, err error) {
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t1 := time.Now()
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defer func() {
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if err == nil {
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log.G(ctx).WithFields(logrus.Fields{
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"d": time.Now().Sub(t1),
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"dgst": desc.Digest,
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"size": desc.Size,
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"media": desc.MediaType,
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}).Debugf("diff applied")
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}
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}()
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isCompressed, err := images.IsCompressedDiff(ctx, desc.MediaType)
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if err != nil {
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return emptyDesc, errors.Wrapf(errdefs.ErrNotImplemented, "unsupported diff media type: %v", desc.MediaType)
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}
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var ocidesc ocispec.Descriptor
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if err := mount.WithTempMount(ctx, mounts, func(root string) error {
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ra, err := s.store.ReaderAt(ctx, desc)
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if err != nil {
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return errors.Wrap(err, "failed to get reader from content store")
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}
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defer ra.Close()
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r := content.NewReader(ra)
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if isCompressed {
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ds, err := compression.DecompressStream(r)
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if err != nil {
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return err
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}
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defer ds.Close()
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r = ds
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}
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digester := digest.Canonical.Digester()
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rc := &readCounter{
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r: io.TeeReader(r, digester.Hash()),
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}
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if _, err := archive.Apply(ctx, root, rc); err != nil {
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return err
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}
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// Read any trailing data
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if _, err := io.Copy(ioutil.Discard, rc); err != nil {
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return err
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}
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ocidesc = ocispec.Descriptor{
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MediaType: ocispec.MediaTypeImageLayer,
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Size: rc.c,
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Digest: digester.Digest(),
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}
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return nil
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}); err != nil {
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return emptyDesc, err
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}
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return ocidesc, nil
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}
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type readCounter struct {
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r io.Reader
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c int64
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}
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func (rc *readCounter) Read(p []byte) (n int, err error) {
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n, err = rc.r.Read(p)
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rc.c += int64(n)
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return
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}
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