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package archive
import (
"context"
"fmt"
"strings"
"github.com/containers/image/docker/reference"
ctrImage "github.com/containers/image/image"
"github.com/containers/image/transports"
"github.com/containers/image/types"
"github.com/pkg/errors"
)
func init() {
transports.Register(Transport)
}
// Transport is an ImageTransport for local Docker archives.
var Transport = archiveTransport{}
type archiveTransport struct{}
func (t archiveTransport) Name() string {
return "docker-archive"
}
// ParseReference converts a string, which should not start with the ImageTransport.Name prefix, into an ImageReference.
func (t archiveTransport) ParseReference(reference string) (types.ImageReference, error) {
return ParseReference(reference)
}
// ValidatePolicyConfigurationScope checks that scope is a valid name for a signature.PolicyTransportScopes keys
// (i.e. a valid PolicyConfigurationIdentity() or PolicyConfigurationNamespaces() return value).
// It is acceptable to allow an invalid value which will never be matched, it can "only" cause user confusion.
// scope passed to this function will not be "", that value is always allowed.
func (t archiveTransport) ValidatePolicyConfigurationScope(scope string) error {
// See the explanation in archiveReference.PolicyConfigurationIdentity.
return errors.New(`docker-archive: does not support any scopes except the default "" one`)
}
// archiveReference is an ImageReference for Docker images.
type archiveReference struct {
destinationRef reference.NamedTagged // only used for destinations
path string
}
// ParseReference converts a string, which should not start with the ImageTransport.Name prefix, into an Docker ImageReference.
func ParseReference(refString string) (types.ImageReference, error) {
if refString == "" {
return nil, errors.Errorf("docker-archive reference %s isn't of the form <path>[:<reference>]", refString)
}
parts := strings.SplitN(refString, ":", 2)
path := parts[0]
var destinationRef reference.NamedTagged
// A :tag was specified, which is only necessary for destinations.
if len(parts) == 2 {
ref, err := reference.ParseNormalizedNamed(parts[1])
if err != nil {
return nil, errors.Wrapf(err, "docker-archive parsing reference")
}
ref = reference.TagNameOnly(ref)
if _, isDigest := ref.(reference.Canonical); isDigest {
return nil, errors.Errorf("docker-archive doesn't support digest references: %s", refString)
}
refTagged, isTagged := ref.(reference.NamedTagged)
if !isTagged {
// Really shouldn't be hit...
return nil, errors.Errorf("internal error: reference is not tagged even after reference.TagNameOnly: %s", refString)
}
destinationRef = refTagged
}
return archiveReference{
destinationRef: destinationRef,
path: path,
}, nil
}
func (ref archiveReference) Transport() types.ImageTransport {
return Transport
}
// StringWithinTransport returns a string representation of the reference, which MUST be such that
// reference.Transport().ParseReference(reference.StringWithinTransport()) returns an equivalent reference.
// NOTE: The returned string is not promised to be equal to the original input to ParseReference;
// e.g. default attribute values omitted by the user may be filled in in the return value, or vice versa.
// WARNING: Do not use the return value in the UI to describe an image, it does not contain the Transport().Name() prefix.
func (ref archiveReference) StringWithinTransport() string {
if ref.destinationRef == nil {
return ref.path
}
return fmt.Sprintf("%s:%s", ref.path, ref.destinationRef.String())
}
// DockerReference returns a Docker reference associated with this reference
// (fully explicit, i.e. !reference.IsNameOnly, but reflecting user intent,
// not e.g. after redirect or alias processing), or nil if unknown/not applicable.
func (ref archiveReference) DockerReference() reference.Named {
return ref.destinationRef
}
// PolicyConfigurationIdentity returns a string representation of the reference, suitable for policy lookup.
// This MUST reflect user intent, not e.g. after processing of third-party redirects or aliases;
// The value SHOULD be fully explicit about its semantics, with no hidden defaults, AND canonical
// (i.e. various references with exactly the same semantics should return the same configuration identity)
// It is fine for the return value to be equal to StringWithinTransport(), and it is desirable but
// not required/guaranteed that it will be a valid input to Transport().ParseReference().
// Returns "" if configuration identities for these references are not supported.
func (ref archiveReference) PolicyConfigurationIdentity() string {
// Punt, the justification is similar to dockerReference.PolicyConfigurationIdentity.
return ""
}
// PolicyConfigurationNamespaces returns a list of other policy configuration namespaces to search
// for if explicit configuration for PolicyConfigurationIdentity() is not set. The list will be processed
// in order, terminating on first match, and an implicit "" is always checked at the end.
// It is STRONGLY recommended for the first element, if any, to be a prefix of PolicyConfigurationIdentity(),
// and each following element to be a prefix of the element preceding it.
func (ref archiveReference) PolicyConfigurationNamespaces() []string {
// TODO
return []string{}
}
// NewImage returns a types.ImageCloser for this reference, possibly specialized for this ImageTransport.
// The caller must call .Close() on the returned ImageCloser.
// NOTE: If any kind of signature verification should happen, build an UnparsedImage from the value returned by NewImageSource,
// verify that UnparsedImage, and convert it into a real Image via image.FromUnparsedImage.
// WARNING: This may not do the right thing for a manifest list, see image.FromSource for details.
func (ref archiveReference) NewImage(ctx context.Context, sys *types.SystemContext) (types.ImageCloser, error) {
src, err := newImageSource(ctx, ref)
if err != nil {
return nil, err
}
return ctrImage.FromSource(ctx, sys, src)
}
// NewImageSource returns a types.ImageSource for this reference.
// The caller must call .Close() on the returned ImageSource.
func (ref archiveReference) NewImageSource(ctx context.Context, sys *types.SystemContext) (types.ImageSource, error) {
return newImageSource(ctx, ref)
}
// NewImageDestination returns a types.ImageDestination for this reference.
// The caller must call .Close() on the returned ImageDestination.
func (ref archiveReference) NewImageDestination(ctx context.Context, sys *types.SystemContext) (types.ImageDestination, error) {
return newImageDestination(ref)
}
// DeleteImage deletes the named image from the registry, if supported.
func (ref archiveReference) DeleteImage(ctx context.Context, sys *types.SystemContext) error {
// Not really supported, for safety reasons.
return errors.New("Deleting images not implemented for docker-archive: images")
}
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