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images: simplify mediatype logic

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Signed-off-by: Bjorn Neergaard <bjorn.neergaard@docker.com>
This commit is contained in:
Bjorn Neergaard 2023-09-27 09:06:08 -06:00
parent 377c5ca9cd
commit 62f621a344
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1 changed files with 13 additions and 23 deletions
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36
images/image.go
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@ -321,7 +321,6 @@ func Check(ctx context.Context, provider content.Provider, image ocispec.Descrip
// Children returns the immediate children of content described by the descriptor.
func Children(ctx context.Context, provider content.Provider, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
var descs []ocispec.Descriptor
if IsManifestType(desc.MediaType) {
p, err := content.ReadBlob(ctx, provider, desc)
if err != nil {
@ -339,8 +338,7 @@ func Children(ctx context.Context, provider content.Provider, desc ocispec.Descr
return nil, err
}
descs = append(descs, manifest.Config)
descs = append(descs, manifest.Layers...)
return append([]ocispec.Descriptor{manifest.Config}, manifest.Layers...), nil
} else if IsIndexType(desc.MediaType) {
p, err := content.ReadBlob(ctx, provider, desc)
if err != nil {
@ -356,16 +354,12 @@ func Children(ctx context.Context, provider content.Provider, desc ocispec.Descr
return nil, err
}
descs = append(descs, index.Manifests...)
} else {
if IsLayerType(desc.MediaType) || IsKnownConfig(desc.MediaType) {
// childless data types.
return nil, nil
}
return append([]ocispec.Descriptor{}, index.Manifests...), nil
} else if !IsLayerType(desc.MediaType) && !IsKnownConfig(desc.MediaType) {
// Layers and configs are childless data types and should not be logged.
log.G(ctx).Debugf("encountered unknown type %v; children may not be fetched", desc.MediaType)
}
return descs, nil
return nil, nil
}
// unknownDocument represents a manifest, manifest list, or index that has not
@ -378,9 +372,10 @@ type unknownDocument struct {
FSLayers json.RawMessage `json:"fsLayers,omitempty"` // schema 1
}
// validateMediaType returns an error if the byte slice is invalid JSON or if
// the media type identifies the blob as one format but it contains elements of
// another format.
// validateMediaType returns an error if the byte slice is invalid JSON,
// if the format of the blob is not supported, or if the media type
// identifies the blob as one format, but it identifies itself as, or
// contains elements of another format.
func validateMediaType(b []byte, mt string) error {
var doc unknownDocument
if err := json.Unmarshal(b, &doc); err != nil {
@ -389,15 +384,10 @@ func validateMediaType(b []byte, mt string) error {
if len(doc.FSLayers) != 0 {
return fmt.Errorf("media-type: schema 1 not supported")
}
if IsManifestType(mt) {
if len(doc.Manifests) != 0 || IsIndexType(doc.MediaType) {
return fmt.Errorf("media-type: expected manifest but found index (%s)", mt)
}
} else if IsIndexType(mt) {
if len(doc.Config) != 0 || len(doc.Layers) != 0 || IsManifestType(doc.MediaType) {
return fmt.Errorf("media-type: expected index but found manifest (%s)", mt)
}
if IsManifestType(mt) && (len(doc.Manifests) != 0 || IsIndexType(doc.MediaType)) {
return fmt.Errorf("media-type: expected manifest but found index (%s)", mt)
} else if IsIndexType(mt) && (len(doc.Config) != 0 || len(doc.Layers) != 0 || IsManifestType(doc.MediaType)) {
return fmt.Errorf("media-type: expected index but found manifest (%s)", mt)
}
return nil
}