Fail docker logs on all logging drivers apart from 'json-file'

Signed-off-by: Alexander Morozov <lk4d4@docker.com>

daemon/container.go

@@ -1489,3 +1489,12 @@ func (container *Container) getNetworkedContainer() (*Container, error) {
 func (container *Container) Stats() (*execdriver.ResourceStats, error) {
 	return container.daemon.Stats(container)
 }
+
+func (c *Container) LogDriverType() string {
+	c.Lock()
+	defer c.Unlock()
+	if c.hostConfig.LogConfig.Type == "" {
+		return c.daemon.defaultLogConfig.Type
+	}
+	return c.hostConfig.LogConfig.Type
+}

daemon/logs.go

@@ -44,6 +44,9 @@ func (daemon *Daemon) ContainerLogs(job *engine.Job) engine.Status {
 	if err != nil {
 		return job.Error(err)
 	}
+	if container.LogDriverType() != "json-file" {
+		return job.Errorf("\"logs\" endpoint is supported only for \"json-file\" logging driver")
+	}
 	cLog, err := container.ReadLog("json")
 	if err != nil && os.IsNotExist(err) {
 		// Legacy logs