113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
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.Digest)
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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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