127 lines
3.2 KiB
Go
127 lines
3.2 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package manager
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"regexp"
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"strconv"
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"strings"
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"syscall"
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dclient "github.com/fsouza/go-dockerclient"
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"github.com/google/cadvisor/container/docker"
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"github.com/google/cadvisor/info"
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)
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var numCpuRegexp = regexp.MustCompile("processor\\t*: +[0-9]+")
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var memoryCapacityRegexp = regexp.MustCompile("MemTotal: *([0-9]+) kB")
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func getMachineInfo() (*info.MachineInfo, error) {
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// Get the number of CPUs from /proc/cpuinfo.
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out, err := ioutil.ReadFile("/proc/cpuinfo")
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if err != nil {
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return nil, err
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}
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numCores := len(numCpuRegexp.FindAll(out, -1))
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if numCores == 0 {
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return nil, fmt.Errorf("failed to count cores in output: %s", string(out))
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}
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// Get the amount of usable memory from /proc/meminfo.
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out, err = ioutil.ReadFile("/proc/meminfo")
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if err != nil {
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return nil, err
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}
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matches := memoryCapacityRegexp.FindSubmatch(out)
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if len(matches) != 2 {
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return nil, fmt.Errorf("failed to find memory capacity in output: %s", string(out))
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}
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memoryCapacity, err := strconv.ParseInt(string(matches[1]), 10, 64)
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if err != nil {
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return nil, err
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}
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// Capacity is in KB, convert it to bytes.
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memoryCapacity = memoryCapacity * 1024
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return &info.MachineInfo{
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NumCores: numCores,
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MemoryCapacity: memoryCapacity,
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}, nil
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}
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func getVersionInfo() (*info.VersionInfo, error) {
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kernel_version := getKernelVersion()
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container_os := getContainerOsVersion()
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docker_version := getDockerVersion()
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return &info.VersionInfo{
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KernelVersion: kernel_version,
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ContainerOsVersion: container_os,
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DockerVersion: docker_version,
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}, nil
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}
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func getContainerOsVersion() string {
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container_os := "Unknown"
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os_release, err := ioutil.ReadFile("/etc/os-release")
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if err == nil {
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// We might be running in a busybox or some hand-crafted image.
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// It's useful to know why cadvisor didn't come up.
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for _, line := range strings.Split(string(os_release), "\n") {
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parsed := strings.Split(line, "\"")
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if len(parsed) == 3 && parsed[0] == "PRETTY_NAME=" {
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container_os = parsed[1]
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break
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}
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}
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}
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return container_os
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}
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func getDockerVersion() string {
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docker_version := "Unknown"
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client, err := dclient.NewClient(*docker.ArgDockerEndpoint)
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if err == nil {
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version, err := client.Version()
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if err == nil {
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docker_version = version.Get("Version")
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}
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}
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return docker_version
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}
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func getKernelVersion() string {
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uname := &syscall.Utsname{}
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if err := syscall.Uname(uname); err != nil {
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return "Unknown"
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}
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release := make([]byte, len(uname.Release))
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i := 0
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for _, c := range uname.Release {
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release[i] = byte(c)
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i++
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}
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release = release[:bytes.IndexByte(release, 0)]
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return string(release)
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}
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