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bugfix: cache empty layer for docker schema1 image

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containerd should cache empty label for docker schema1 image.

if not, the original empty layer will be non-empty layer and the image
config will be changed too. in this case, the image ID will be changed.

check the blob empty label to avoid changing image ID when repull docker
schema1 image.

Signed-off-by: Wei Fu <fuweid89@gmail.com>
This commit is contained in:
Wei Fu 2018-09-28 13:40:24 +08:00
parent 87d1118a0f
commit 57d79e1b49
1 changed files with 19 additions and 3 deletions
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22
remotes/docker/schema1/converter.go
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@ -24,6 +24,7 @@ import (
"fmt"
"io"
"io/ioutil"
"strconv"
"strings"
"sync"
"time"
@ -42,7 +43,10 @@ import (
"github.com/pkg/errors"
)
const manifestSizeLimit = 8e6 // 8MB
const (
manifestSizeLimit = 8e6 // 8MB
labelDockerSchema1EmptyLayer = "containerd.io/docker.schema1.empty.layer"
)
type blobState struct {
diffID digest.Digest
@ -353,10 +357,11 @@ func (c *Converter) fetchBlob(ctx context.Context, desc ocispec.Descriptor) erro
Digest: desc.Digest,
Labels: map[string]string{
"containerd.io/uncompressed": state.diffID.String(),
labelDockerSchema1EmptyLayer: strconv.FormatBool(state.empty),
},
}
if _, err := c.contentStore.Update(ctx, cinfo, "labels.containerd.io/uncompressed"); err != nil {
if _, err := c.contentStore.Update(ctx, cinfo, "labels.containerd.io/uncompressed", fmt.Sprintf("labels.%s", labelDockerSchema1EmptyLayer)); err != nil {
return errors.Wrap(err, "failed to update uncompressed label")
}
@ -380,7 +385,18 @@ func (c *Converter) reuseLabelBlobState(ctx context.Context, desc ocispec.Descri
return false, nil
}
bState := blobState{empty: false}
emptyVal, ok := cinfo.Labels[labelDockerSchema1EmptyLayer]
if !ok {
return false, nil
}
isEmpty, err := strconv.ParseBool(emptyVal)
if err != nil {
log.G(ctx).WithField("id", desc.Digest).Warnf("failed to parse bool from label %s: %v", labelDockerSchema1EmptyLayer, isEmpty)
return false, nil
}
bState := blobState{empty: isEmpty}
if bState.diffID, err = digest.Parse(diffID); err != nil {
log.G(ctx).WithField("id", desc.Digest).Warnf("failed to parse digest from label containerd.io/uncompressed: %v", diffID)