Add system uuid and machine id information

Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>

info/v1/machine.go

@@ -122,6 +122,12 @@ type MachineInfo struct {
 	// The amount of memory (in bytes) in this machine
 	MemoryCapacity int64 `json:"memory_capacity"`
 
+	// The machine id
+	MachineID string `json:"machine_id"`
+
+	// The system uuid
+	SystemUUID string `json:"system_uuid"`
+
 	// Filesystems on this machine.
 	Filesystems []FsInfo `json:"filesystems"`
 

manager/machine.go

@@ -16,6 +16,7 @@ package manager
 
 import (
 	"bytes"
+	"flag"
 	"fmt"
 	"io/ioutil"
 	"regexp"
@@ -24,6 +25,7 @@ import (
 	"syscall"
 
 	dclient "github.com/fsouza/go-dockerclient"
+	"github.com/golang/glog"
 	"github.com/google/cadvisor/container/docker"
 	"github.com/google/cadvisor/fs"
 	info "github.com/google/cadvisor/info/v1"
@@ -39,6 +41,8 @@ var nodeRegExp = regexp.MustCompile("physical id\\t*: +([0-9]+)")
 var CpuClockSpeedMHz = regexp.MustCompile("cpu MHz\\t*: +([0-9]+.[0-9]+)")
 var memoryCapacityRegexp = regexp.MustCompile("MemTotal: *([0-9]+) kB")
 
+var machineIdFilePath = flag.String("machine_id_file", "/etc/machine-id", "File containing the machine-id")
+
 func getClockSpeed(procInfo []byte) (uint64, error) {
 	// First look through sys to find a max supported cpu frequency.
 	const maxFreqFile = "/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq"
@@ -205,6 +209,15 @@ func getTopology(sysFs sysfs.SysFs, cpuinfo string) ([]info.Node, int, error) {
 	return nodes, numCores, nil
 }
 
+func getMachineID() string {
+	id, err := ioutil.ReadFile(*machineIdFilePath)
+	if err != nil {
+		glog.Error("Couldn't collect machine-id: ", err)
+		return ""
+	}
+	return strings.TrimSpace(string(id))
+}
+
 func getMachineInfo(sysFs sysfs.SysFs) (*info.MachineInfo, error) {
 	cpuinfo, err := ioutil.ReadFile("/proc/cpuinfo")
 	clockSpeed, err := getClockSpeed(cpuinfo)
@@ -247,6 +260,11 @@ func getMachineInfo(sysFs sysfs.SysFs) (*info.MachineInfo, error) {
 		return nil, err
 	}
 
+	system_uuid, err := sysinfo.GetSystemUUID(sysFs)
+	if err != nil {
+		return nil, err
+	}
+
 	machineInfo := &info.MachineInfo{
 		NumCores:       numCores,
 		CpuFrequency:   clockSpeed,
@@ -254,6 +272,8 @@ func getMachineInfo(sysFs sysfs.SysFs) (*info.MachineInfo, error) {
 		DiskMap:        diskMap,
 		NetworkDevices: netDevices,
 		Topology:       topology,
+		MachineID:      getMachineID(),
+		SystemUUID:     system_uuid,
 	}
 
 	for _, fs := range filesystems {

utils/sysfs/fakesysfs/fake.go

@@ -108,3 +108,7 @@ func (self *FakeSysFs) SetCacheInfo(cache sysfs.CacheInfo) {
 func (self *FakeSysFs) SetEntryName(name string) {
 	self.info.EntryName = name
 }
+
+func (self *FakeSysFs) GetSystemUUID() (string, error) {
+	return "1F862619-BA9F-4526-8F85-ECEAF0C97430", nil
+}

utils/sysfs/sysfs.go

@@ -27,6 +27,7 @@ const (
 	blockDir = "/sys/block"
 	cacheDir = "/sys/devices/system/cpu/cpu"
 	netDir   = "/sys/class/net"
+	dmiDir   = "/sys/class/dmi"
 )
 
 type CacheInfo struct {
@@ -61,6 +62,8 @@ type SysFs interface {
 	GetCaches(id int) ([]os.FileInfo, error)
 	// Get information for a cache accessible from the given cpu.
 	GetCacheInfo(cpu int, cache string) (CacheInfo, error)
+
+	GetSystemUUID() (string, error)
 }
 
 type realSysFs struct{}
@@ -228,3 +231,11 @@ func (self *realSysFs) GetCacheInfo(id int, name string) (CacheInfo, error) {
 		Cpus:  cpuCount,
 	}, nil
 }
+
+func (self *realSysFs) GetSystemUUID() (string, error) {
+	id, err := ioutil.ReadFile(path.Join(dmiDir, "id", "product_uuid"))
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(id)), nil
+}

utils/sysinfo/sysinfo.go

@@ -204,3 +204,7 @@ func getNetworkStats(name string, sysFs sysfs.SysFs) (info.NetworkStats, error)
 	}
 	return stats, nil
 }
+
+func GetSystemUUID(sysFs sysfs.SysFs) (string, error) {
+	return sysFs.GetSystemUUID()
+}