100 lines
3.6 KiB
Go
100 lines
3.6 KiB
Go
package images // import "github.com/docker/docker/daemon/images"
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import (
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"fmt"
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"github.com/pkg/errors"
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"github.com/docker/distribution/reference"
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"github.com/docker/docker/errdefs"
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"github.com/docker/docker/image"
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specs "github.com/opencontainers/image-spec/specs-go/v1"
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)
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// ErrImageDoesNotExist is error returned when no image can be found for a reference.
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type ErrImageDoesNotExist struct {
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ref reference.Reference
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}
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func (e ErrImageDoesNotExist) Error() string {
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ref := e.ref
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if named, ok := ref.(reference.Named); ok {
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ref = reference.TagNameOnly(named)
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}
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return fmt.Sprintf("No such image: %s", reference.FamiliarString(ref))
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}
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// NotFound implements the NotFound interface
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func (e ErrImageDoesNotExist) NotFound() {}
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// GetImage returns an image corresponding to the image referred to by refOrID.
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func (i *ImageService) GetImage(refOrID string, platform *specs.Platform) (retImg *image.Image, retErr error) {
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defer func() {
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if retErr != nil || retImg == nil || platform == nil {
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return
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}
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// This allows us to tell clients that we don't have the image they asked for
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// Where this gets hairy is the image store does not currently support multi-arch images, e.g.:
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// An image `foo` may have a multi-arch manifest, but the image store only fetches the image for a specific platform
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// The image store does not store the manifest list and image tags are assigned to architecture specific images.
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// So we can have a `foo` image that is amd64 but the user requested armv7. If the user looks at the list of images.
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// This may be confusing.
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// The alternative to this is to return a errdefs.Conflict error with a helpful message, but clients will not be
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// able to automatically tell what causes the conflict.
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if retImg.OS != platform.OS {
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retErr = errdefs.NotFound(errors.Errorf("image with reference %s was found but does not match the specified OS platform: wanted: %s, actual: %s", refOrID, platform.OS, retImg.OS))
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retImg = nil
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return
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}
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if retImg.Architecture != platform.Architecture {
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retErr = errdefs.NotFound(errors.Errorf("image with reference %s was found but does not match the specified platform cpu architecture: wanted: %s, actual: %s", refOrID, platform.Architecture, retImg.Architecture))
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retImg = nil
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return
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}
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// Only validate variant if retImg has a variant set.
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// The image variant may not be set since it's a newer field.
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if platform.Variant != "" && retImg.Variant != "" && retImg.Variant != platform.Variant {
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retErr = errdefs.NotFound(errors.Errorf("image with reference %s was found but does not match the specified platform cpu architecture variant: wanted: %s, actual: %s", refOrID, platform.Variant, retImg.Variant))
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retImg = nil
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return
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}
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}()
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ref, err := reference.ParseAnyReference(refOrID)
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if err != nil {
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return nil, errdefs.InvalidParameter(err)
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}
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namedRef, ok := ref.(reference.Named)
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if !ok {
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digested, ok := ref.(reference.Digested)
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if !ok {
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return nil, ErrImageDoesNotExist{ref}
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}
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id := image.IDFromDigest(digested.Digest())
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if img, err := i.imageStore.Get(id); err == nil {
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return img, nil
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}
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return nil, ErrImageDoesNotExist{ref}
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}
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if digest, err := i.referenceStore.Get(namedRef); err == nil {
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// Search the image stores to get the operating system, defaulting to host OS.
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id := image.IDFromDigest(digest)
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if img, err := i.imageStore.Get(id); err == nil {
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return img, nil
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}
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}
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// Search based on ID
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if id, err := i.imageStore.Search(refOrID); err == nil {
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img, err := i.imageStore.Get(id)
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if err != nil {
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return nil, ErrImageDoesNotExist{ref}
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}
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return img, nil
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}
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return nil, ErrImageDoesNotExist{ref}
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}
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