b763777288
Remove combined interface and split implementations. Signed-off-by: Derek McGowan <derek@mcgstyle.net>
113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
package apply
|
|
|
|
import (
|
|
"context"
|
|
"io"
|
|
"io/ioutil"
|
|
"time"
|
|
|
|
"github.com/containerd/containerd/archive"
|
|
"github.com/containerd/containerd/archive/compression"
|
|
"github.com/containerd/containerd/content"
|
|
"github.com/containerd/containerd/diff"
|
|
"github.com/containerd/containerd/errdefs"
|
|
"github.com/containerd/containerd/images"
|
|
"github.com/containerd/containerd/log"
|
|
"github.com/containerd/containerd/mount"
|
|
digest "github.com/opencontainers/go-digest"
|
|
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
|
|
"github.com/pkg/errors"
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// NewFileSystemApplier returns an applier which simply mounts
|
|
// and applies diff onto the mounted filesystem.
|
|
func NewFileSystemApplier(cs content.Store) diff.Applier {
|
|
return &fsApplier{
|
|
store: cs,
|
|
}
|
|
}
|
|
|
|
type fsApplier struct {
|
|
store content.Store
|
|
}
|
|
|
|
var emptyDesc = ocispec.Descriptor{}
|
|
|
|
// Apply applies the content associated with the provided digests onto the
|
|
// provided mounts. Archive content will be extracted and decompressed if
|
|
// necessary.
|
|
func (s *fsApplier) Apply(ctx context.Context, desc ocispec.Descriptor, mounts []mount.Mount) (d ocispec.Descriptor, err error) {
|
|
t1 := time.Now()
|
|
defer func() {
|
|
if err == nil {
|
|
log.G(ctx).WithFields(logrus.Fields{
|
|
"d": time.Now().Sub(t1),
|
|
"dgst": desc.Digest,
|
|
"size": desc.Size,
|
|
"media": desc.MediaType,
|
|
}).Debugf("diff applied")
|
|
}
|
|
}()
|
|
|
|
isCompressed, err := images.IsCompressedDiff(ctx, desc.MediaType)
|
|
if err != nil {
|
|
return emptyDesc, errors.Wrapf(errdefs.ErrNotImplemented, "unsupported diff media type: %v", desc.MediaType)
|
|
}
|
|
|
|
var ocidesc ocispec.Descriptor
|
|
if err := mount.WithTempMount(ctx, mounts, func(root string) error {
|
|
ra, err := s.store.ReaderAt(ctx, desc.Digest)
|
|
if err != nil {
|
|
return errors.Wrap(err, "failed to get reader from content store")
|
|
}
|
|
defer ra.Close()
|
|
|
|
r := content.NewReader(ra)
|
|
if isCompressed {
|
|
ds, err := compression.DecompressStream(r)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer ds.Close()
|
|
r = ds
|
|
}
|
|
|
|
digester := digest.Canonical.Digester()
|
|
rc := &readCounter{
|
|
r: io.TeeReader(r, digester.Hash()),
|
|
}
|
|
|
|
if _, err := archive.Apply(ctx, root, rc); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Read any trailing data
|
|
if _, err := io.Copy(ioutil.Discard, rc); err != nil {
|
|
return err
|
|
}
|
|
|
|
ocidesc = ocispec.Descriptor{
|
|
MediaType: ocispec.MediaTypeImageLayer,
|
|
Size: rc.c,
|
|
Digest: digester.Digest(),
|
|
}
|
|
return nil
|
|
|
|
}); err != nil {
|
|
return emptyDesc, err
|
|
}
|
|
return ocidesc, nil
|
|
}
|
|
|
|
type readCounter struct {
|
|
r io.Reader
|
|
c int64
|
|
}
|
|
|
|
func (rc *readCounter) Read(p []byte) (n int, err error) {
|
|
n, err = rc.r.Read(p)
|
|
rc.c += int64(n)
|
|
return
|
|
}
|