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Handle OCI manifests and image indexes without a media type

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In the OCI image specification, the MediaType field is reserved
and otherwise undefined; assume that manifests without a media
in storage are OCI images or image indexes, and determine which
by looking at what fields are in the JSON. We do keep a check
that when unmarshalling an OCI image or image index, if it has
a MediaType field, it must match that media type of the upload.

Signed-off-by: Owen W. Taylor <otaylor@fishsoup.net>
This commit is contained in:
Owen W. Taylor 2018-03-14 17:22:36 -04:00
parent 1d47ef7b80
commit 60d9c5dfad
5 changed files with 27 additions and 8 deletions
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6
manifest/ocischema/manifest.go
View file

@ -97,8 +97,8 @@ func (m *DeserializedManifest) UnmarshalJSON(b []byte) error {
return err
}
if manifest.MediaType != v1.MediaTypeImageManifest {
return fmt.Errorf("mediaType in manifest should be '%s' not '%s'",
if manifest.MediaType != "" && manifest.MediaType != v1.MediaTypeImageManifest {
return fmt.Errorf("if present, mediaType in manifest should be '%s' not '%s'",
v1.MediaTypeImageManifest, manifest.MediaType)
}
@ -120,5 +120,5 @@ func (m *DeserializedManifest) MarshalJSON() ([]byte, error) {
// Payload returns the raw content of the manifest. The contents can be used to
// calculate the content identifier.
func (m DeserializedManifest) Payload() (string, []byte, error) {
return m.MediaType, m.canonical, nil
return v1.MediaTypeImageManifest, m.canonical, nil
}