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Avoid parsing image metadata

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Avoid parsing metadata that the image library keeps in order to find an
image's top layer and creation date; instead, use the values which the
storage library now makes available, which will be correct once we merge
PR #654 or something like it.

Instead of assuming the last blob which was added for the image was the
manifest, read it directly and compute its digest ourselves.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>
This commit is contained in:
Nalin Dahyabhai 2017-07-25 15:33:41 -04:00
parent 7e9ac9700b
commit cb0bb94c68
4 changed files with 33 additions and 91 deletions
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52
libkpod/image/image.go
View file

@ -8,6 +8,7 @@ import (
is "github.com/containers/image/storage"
"github.com/containers/storage"
"github.com/kubernetes-incubator/cri-o/libkpod/common"
digest "github.com/opencontainers/go-digest"
"github.com/pkg/errors"
)
@ -41,13 +42,13 @@ func ParseFilter(store storage.Store, filter string) (*FilterParams, error) {
params.label = pair[1]
case "before":
if img, err := findImageInSlice(images, pair[1]); err == nil {
params.beforeImage, _ = getCreatedTime(img)
params.beforeImage = img.Created
} else {
return nil, fmt.Errorf("no such id: %s", pair[0])
}
case "since":
if img, err := findImageInSlice(images, pair[1]); err == nil {
params.sinceImage, _ = getCreatedTime(img)
params.sinceImage = img.Created
} else {
return nil, fmt.Errorf("no such id: %s``", pair[0])
}
@ -123,11 +124,7 @@ func matchesBeforeImage(image storage.Image, name string, params *FilterParams)
if params.beforeImage.IsZero() {
return true
}
createdTime, err := getCreatedTime(image)
if err != nil {
return false
}
if createdTime.Before(params.beforeImage) {
if image.Created.Before(params.beforeImage) {
return true
}
return false
@ -139,11 +136,7 @@ func matchesSinceImage(image storage.Image, name string, params *FilterParams) b
if params.sinceImage.IsZero() {
return true
}
createdTime, err := getCreatedTime(image)
if err != nil {
return false
}
if createdTime.After(params.beforeImage) {
if image.Created.After(params.sinceImage) {
return true
}
return false
@ -219,43 +212,32 @@ func findImageInSlice(images []storage.Image, ref string) (storage.Image, error)
return storage.Image{}, errors.New("could not find image")
}
// Size returns the size of the image in the given store
func Size(store storage.Store, img storage.Image) (int64, error) {
// DigestAndSize returns the size of the image in the given store and the
// digest of its manifest, if it has one, or "" if it doesn't.
func DigestAndSize(store storage.Store, img storage.Image) (digest.Digest, int64, error) {
is.Transport.SetStore(store)
storeRef, err := is.Transport.ParseStoreReference(store, "@"+img.ID)
if err != nil {
return -1, err
return "", -1, errors.Wrapf(err, "error parsing image reference %q", "@"+img.ID)
}
imgRef, err := storeRef.NewImage(nil)
if err != nil {
return -1, err
return "", -1, errors.Wrapf(err, "error reading image %q", img.ID)
}
defer imgRef.Close()
imgSize, err := imgRef.Size()
if err != nil {
return -1, err
return "", -1, errors.Wrapf(err, "error reading size of image %q", img.ID)
}
return imgSize, nil
}
// GetTopLayerID returns the ID of the top layer of the image
func GetTopLayerID(img storage.Image) (string, error) {
metadata, err := ParseMetadata(img)
manifest, _, err := imgRef.Manifest()
if err != nil {
return "", err
return "", -1, errors.Wrapf(err, "error reading manifest for image %q", img.ID)
}
// Get the digest of the first blob
digest := string(metadata.Blobs[0].Digest)
// Return the first layer associated with the given digest
return metadata.Layers[digest][0], nil
}
func getCreatedTime(image storage.Image) (time.Time, error) {
metadata, err := ParseMetadata(image)
if err != nil {
return time.Time{}, err
manifestDigest := digest.Digest("")
if len(manifest) > 0 {
manifestDigest = digest.Canonical.FromBytes(manifest)
}
return metadata.CreatedTime, nil
return manifestDigest, imgSize, nil
}
// GetImagesMatchingFilter returns a slice of all images in the store that match the provided FilterParams.