fix parameter inheritence

parameters are not inherited because they are processed differently from
other layer. fix this by explicitly merging the inherited params into
the new params. parameter values defined in the new modelfile will
override those defined in the inherited modelfile. array lists are
replaced instead of appended

server/images.go

@@ -276,6 +276,7 @@ func CreateModel(ctx context.Context, name string, path string, fn func(resp api
 
 	var layers []*LayerReader
 	params := make(map[string][]string)
+	var sourceParams map[string]any
 	embed := EmbeddingParams{fn: fn}
 	for _, c := range commands {
 		log.Printf("[%s] - %s\n", c.Name, c.Args)
@@ -359,6 +360,23 @@ func CreateModel(ctx context.Context, name string, path string, fn func(resp api
 				config.FileType = source.FileType
 
 				for _, l := range mf.Layers {
+					if l.MediaType == "application/vnd.ollama.image.params" {
+						sourceParamsBlobPath, err := GetBlobsPath(l.Digest)
+						if err != nil {
+							return err
+						}
+
+						sourceParamsBlob, err := os.Open(sourceParamsBlobPath)
+						if err != nil {
+							return err
+						}
+						defer sourceParamsBlob.Close()
+
+						if err := json.NewDecoder(sourceParamsBlob).Decode(&sourceParams); err != nil {
+							return err
+						}
+					}
+
 					newLayer, err := GetLayerWithBufferFromLayer(l)
 					if err != nil {
 						return err
@@ -436,6 +454,12 @@ func CreateModel(ctx context.Context, name string, path string, fn func(resp api
 			return fmt.Errorf("couldn't create params json: %v", err)
 		}
 
+		for k, v := range sourceParams {
+			if _, ok := formattedParams[k]; !ok {
+				formattedParams[k] = v
+			}
+		}
+
 		bts, err := json.Marshal(formattedParams)
 		if err != nil {
 			return err