daemon/container: stream & decode JSON

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)

daemon/container.go

@@ -102,13 +102,17 @@ func (container *Container) FromDisk() error {
 		return err
 	}
 
-	data, err := ioutil.ReadFile(pth)
+	jsonSource, err := os.Open(pth)
 	if err != nil {
 		return err
 	}
+	defer jsonSource.Close()
+
+	dec := json.NewDecoder(jsonSource)
+
 	// Load container settings
 	// udp broke compat of docker.PortMapping, but it's not used when loading a container, we can skip it
-	if err := json.Unmarshal(data, container); err != nil && !strings.Contains(err.Error(), "docker.PortMapping") {
+	if err := dec.Decode(container); err != nil && !strings.Contains(err.Error(), "docker.PortMapping") {
 		return err
 	}