working commit

app/operator/ociaux.go

@@ -63,3 +63,68 @@ func descrsFromManifest(name, reference string, manifest *ocispec.Manifest, rawM
 	}
 	return manifestDescr, blobDescrs, err
 }
+
+func layersDiff(name, reference string, existingManifest, incomingManifest *ocispec.Manifest, rawManifest []byte) ([]descr.Blob, []descr.Blob, error) {
+	var err error
+	newBlobDescrs := make([]descr.Blob, 0)
+	delBlobDescrs := make([]descr.Blob, 0)
+
+	// Calculating old layers
+	delLayers := make([]ocispec.Descriptor, 0)
+	for _, oldLayer := range existingManifest.Layers {
+		uniq := true
+		for _, newLayer := range incomingManifest.Layers {
+			if oldLayer.Digest == newLayer.Digest {
+				uniq = false
+			}
+		}
+		if uniq {
+			delLayers = append(delLayers, oldLayer)
+		}
+	}
+	// Calculating new layers
+	newLayers := make([]ocispec.Descriptor, 0)
+	for _, newLayer := range incomingManifest.Layers {
+		uniq := true
+		for _, oldLayer := range existingManifest.Layers {
+			if oldLayer.Digest == newLayer.Digest {
+				uniq = false
+			}
+		}
+		if uniq {
+			newLayers = append(newLayers, newLayer)
+		}
+	}
+	if incomingManifest.Config.Digest != existingManifest.Config.Digest {
+		delLayers = append(delLayers, existingManifest.Config)
+		newLayers = append(newLayers, incomingManifest.Config)
+	}
+	// Converting to new blob
+	timestamp := auxtool.TimeNow()
+	for _, layer := range newLayers {
+		blobDescr := descr.Blob{
+			ID:        auxuuid.NewUUID(),
+			Name:      name,
+			Reference: reference,
+			MediaType: layer.MediaType,
+			Digest:    string(layer.Digest),
+			Size:      layer.Size,
+			CreatedAt: timestamp,
+			UpdatedAt: timestamp,
+		}
+		newBlobDescrs = append(newBlobDescrs, blobDescr)
+	}
+	// Converting to old blobs
+	for _, layer := range delLayers {
+		blobDescr := descr.Blob{
+			ID:        auxuuid.NewUUID(),
+			Name:      name,
+			Reference: reference,
+			MediaType: layer.MediaType,
+			Digest:    string(layer.Digest),
+			Size:      layer.Size,
+		}
+		delBlobDescrs = append(delBlobDescrs, blobDescr)
+	}
+	return newBlobDescrs, delBlobDescrs, err
+}