From 1223e28905537f5365eda14a40889c5ddcfd4409 Mon Sep 17 00:00:00 2001
From: Shirou WAKAYAMA <shirou.faw@gmail.com>
Date: Fri, 7 Aug 2015 10:14:14 +0900
Subject: [PATCH] docker[linux]: change docker error valiable and add cgroup
 error.

---
 docker/docker.go          | 3 ++-
 docker/docker_linux.go    | 1 -
 docker/docker_notlinux.go | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/docker/docker.go b/docker/docker.go
index 5cd4c62..83a92be 100644
--- a/docker/docker.go
+++ b/docker/docker.go
@@ -2,7 +2,8 @@ package docker
 
 import "errors"
 
-var ErrNotAvailable = errors.New("docker not available")
+var ErrDockerNotAvailable = errors.New("docker not available")
+var ErrCgroupNotAvailable = errors.New("cgroup not available")
 
 type CgroupMemStat struct {
 	ContainerID             string `json:"container_id"`
diff --git a/docker/docker_linux.go b/docker/docker_linux.go
index e148f22..1113e4c 100644
--- a/docker/docker_linux.go
+++ b/docker/docker_linux.go
@@ -4,7 +4,6 @@ package docker
 
 import (
 	"encoding/json"
-	"errors"
 	"os/exec"
 	"path"
 	"strconv"
diff --git a/docker/docker_notlinux.go b/docker/docker_notlinux.go
index 628a856..ff2f5e0 100644
--- a/docker/docker_notlinux.go
+++ b/docker/docker_notlinux.go
@@ -12,7 +12,7 @@ import (
 // GetDockerIDList returnes a list of DockerID.
 // This requires certain permission.
 func GetDockerIDList() ([]string, error) {
-	return nil, common.NotImplementedError
+	return nil, ErrDockerNotAvailable
 }
 
 // CgroupCPU returnes specified cgroup id CPU status.
@@ -20,7 +20,7 @@ func GetDockerIDList() ([]string, error) {
 // If you use container via systemd.slice, you could use
 // containerid = docker-<container id>.scope and base=/sys/fs/cgroup/cpuacct/system.slice/
 func CgroupCPU(containerid string, base string) (*cpu.CPUTimesStat, error) {
-	return nil, common.NotImplementedError
+	return nil, ErrCgroupNotAvailable
 }
 
 func CgroupCPUDocker(containerid string) (*cpu.CPUTimesStat, error) {
@@ -28,7 +28,7 @@ func CgroupCPUDocker(containerid string) (*cpu.CPUTimesStat, error) {
 }
 
 func CgroupMem(containerid string, base string) (*CgroupMemStat, error) {
-	return nil, common.NotImplementedError
+	return nil, ErrCgroupNotAvailable
 }
 
 func CgroupMemDocker(containerid string) (*CgroupMemStat, error) {