From dc3a09c1d02458a20248826cdfc955e7beedbb0f Mon Sep 17 00:00:00 2001
From: shirou <shirou.faw@gmail.com>
Date: Sun, 22 Oct 2017 16:39:36 +0900
Subject: [PATCH] [host] linux: change file if in a lxc container.

---
 host/host_linux.go | 13 ++++++++++++-
 host/host_test.go  |  2 ++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/host/host_linux.go b/host/host_linux.go
index 14893a4..06d469b 100644
--- a/host/host_linux.go
+++ b/host/host_linux.go
@@ -95,7 +95,18 @@ func BootTime() (uint64, error) {
 	if t != 0 {
 		return t, nil
 	}
-	filename := common.HostProc("stat")
+
+	system, role, err := Virtualization()
+	if err != nil {
+		return 0, err
+	}
+	statFile := "stat"
+	if system == "lxc" && role == "guest" {
+		// if lxc, /proc/uptime is used.
+		statFile = "uptime"
+	}
+
+	filename := common.HostProc(statFile)
 	lines, err := common.ReadLines(filename)
 	if err != nil {
 		return 0, err
diff --git a/host/host_test.go b/host/host_test.go
index 65f7a75..d9e6611 100644
--- a/host/host_test.go
+++ b/host/host_test.go
@@ -40,11 +40,13 @@ func TestBoot_time(t *testing.T) {
 	if v < 946652400 {
 		t.Errorf("Invalid Boottime, older than 2000-01-01")
 	}
+	t.Logf("first boot time: %d", v)
 
 	v2, err := BootTime()
 	if v != v2 {
 		t.Errorf("cached boot time is different")
 	}
+	t.Logf("second boot time: %d", v2)
 }
 
 func TestUsers(t *testing.T) {