From 6ad13d126b7d79d6e2a0c0600d972c1e3b1f37a7 Mon Sep 17 00:00:00 2001
From: Victor Marmol <vmarmol@google.com>
Date: Thu, 18 Dec 2014 16:09:50 -0800
Subject: [PATCH] Check filesystem before accessing it in UI.

Fixes #377.
---
 container/raw/handler.go      | 6 ++++--
 pages/static/containers_js.go | 9 ++++++---
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/container/raw/handler.go b/container/raw/handler.go
index a49bd51e07..650049c545 100644
--- a/container/raw/handler.go
+++ b/container/raw/handler.go
@@ -201,7 +201,6 @@ func (self *rawContainerHandler) GetSpec() (info.ContainerSpec, error) {
 }
 
 func (self *rawContainerHandler) getFsStats(stats *info.ContainerStats) error {
-
 	// Get Filesystem information only for the root cgroup.
 	if self.name == "/" {
 		filesystems, err := self.fsInfo.GetGlobalFsInfo()
@@ -210,7 +209,10 @@ func (self *rawContainerHandler) getFsStats(stats *info.ContainerStats) error {
 		}
 		for _, fs := range filesystems {
 			stats.Filesystem = append(stats.Filesystem,
-				info.FsStats{fs.Device, fs.Capacity, fs.Capacity - fs.Free,
+				info.FsStats{
+					fs.Device,
+					fs.Capacity,
+					fs.Capacity - fs.Free,
 					fs.DiskStats.ReadsCompleted,
 					fs.DiskStats.ReadsMerged,
 					fs.DiskStats.SectorsRead,
diff --git a/pages/static/containers_js.go b/pages/static/containers_js.go
index 9ffc512d87..1c36e48710 100644
--- a/pages/static/containers_js.go
+++ b/pages/static/containers_js.go
@@ -1750,10 +1750,13 @@ function startFileSystemUsage(elementId, machineInfo, stats) {
 	// A map of device name to DOM elements.
 	window.cadvisor.fsUsage.elements = {};
 
-	var curr = stats.stats[stats.stats.length - 1];
+	var cur = stats.stats[stats.stats.length - 1];
 	var el = $("<div>");
-	for (var i = 0; i < curr.filesystem.length; i++) {
-		var data = curr.filesystem[i];
+	if (!cur.filesystem) {
+		return;
+	}
+	for (var i = 0; i < cur.filesystem.length; i++) {
+		var data = cur.filesystem[i];
 		el.append($("<div>")
 			.addClass("row col-sm-12")
 			.append($("<h4>")