391 lines
10 KiB
Go
391 lines
10 KiB
Go
// +build linux
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package main
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import (
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"syscall"
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"github.com/Sirupsen/logrus"
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"github.com/codegangsta/cli"
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"github.com/opencontainers/runc/libcontainer/cgroups"
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"github.com/opencontainers/runc/libcontainer/configs"
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"github.com/opencontainers/runc/libcontainer/devices"
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"github.com/opencontainers/specs"
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)
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var specCommand = cli.Command{
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Name: "spec",
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Usage: "create a new specification file",
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Action: func(context *cli.Context) {
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spec := specs.LinuxSpec{
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Spec: specs.Spec{
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Version: specs.Version,
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Platform: specs.Platform{
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OS: runtime.GOOS,
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Arch: runtime.GOARCH,
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},
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Root: specs.Root{
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Path: "rootfs",
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Readonly: true,
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},
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Process: specs.Process{
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Terminal: true,
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User: specs.User{},
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Args: []string{
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"sh",
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},
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Env: []string{
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"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
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"TERM=xterm",
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},
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},
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Hostname: "shell",
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Mounts: []specs.Mount{
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{
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Type: "proc",
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Source: "proc",
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Destination: "/proc",
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Options: "",
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},
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{
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Type: "tmpfs",
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Source: "tmpfs",
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Destination: "/dev",
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Options: "nosuid,strictatime,mode=755,size=65536k",
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},
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{
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Type: "devpts",
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Source: "devpts",
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Destination: "/dev/pts",
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Options: "nosuid,noexec,newinstance,ptmxmode=0666,mode=0620,gid=5",
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},
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{
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Type: "tmpfs",
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Source: "shm",
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Destination: "/dev/shm",
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Options: "nosuid,noexec,nodev,mode=1777,size=65536k",
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},
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{
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Type: "mqueue",
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Source: "mqueue",
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Destination: "/dev/mqueue",
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Options: "nosuid,noexec,nodev",
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},
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{
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Type: "sysfs",
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Source: "sysfs",
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Destination: "/sys",
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Options: "nosuid,noexec,nodev",
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},
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},
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},
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Linux: specs.Linux{
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Namespaces: []specs.Namespace{
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{
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Type: "process",
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},
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{
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Type: "network",
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},
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{
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Type: "ipc",
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},
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{
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Type: "uts",
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},
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{
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Type: "mount",
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},
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},
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Capabilities: []string{
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"AUDIT_WRITE",
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"KILL",
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"NET_BIND_SERVICE",
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},
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Devices: []string{
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"null",
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"random",
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"full",
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"tty",
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"zero",
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"urandom",
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},
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},
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}
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data, err := json.MarshalIndent(&spec, "", "\t")
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if err != nil {
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logrus.Fatal(err)
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}
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fmt.Printf("%s", data)
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},
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}
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var namespaceMapping = map[string]configs.NamespaceType{
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"process": configs.NEWPID,
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"network": configs.NEWNET,
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"mount": configs.NEWNS,
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"user": configs.NEWUSER,
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"ipc": configs.NEWIPC,
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"uts": configs.NEWUTS,
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}
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// loadSpec loads the specification from the provided path.
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// If the path is empty then the default path will be "config.json"
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func loadSpec(path string) (*specs.LinuxSpec, error) {
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if path == "" {
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path = "config.json"
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}
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f, err := os.Open(path)
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if err != nil {
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if os.IsNotExist(err) {
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return nil, fmt.Errorf("JSON specification file for %s not found", path)
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}
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return nil, err
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}
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defer f.Close()
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var s *specs.LinuxSpec
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if err := json.NewDecoder(f).Decode(&s); err != nil {
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return nil, err
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}
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return s, checkSpecVersion(s)
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}
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// checkSpecVersion makes sure that the spec version matches runc's while we are in the initial
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// development period. It is better to hard fail than have missing fields or options in the spec.
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func checkSpecVersion(s *specs.LinuxSpec) error {
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if s.Version != specs.Version {
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return fmt.Errorf("spec version is not compatible with implemented version %q: spec %q", specs.Version, s.Version)
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}
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return nil
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}
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func createLibcontainerConfig(spec *specs.LinuxSpec) (*configs.Config, error) {
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cwd, err := os.Getwd()
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if err != nil {
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return nil, err
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}
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rootfsPath := spec.Root.Path
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if !filepath.IsAbs(rootfsPath) {
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rootfsPath = filepath.Join(cwd, rootfsPath)
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}
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config := &configs.Config{
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Rootfs: rootfsPath,
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Capabilities: spec.Linux.Capabilities,
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Readonlyfs: spec.Root.Readonly,
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Hostname: spec.Hostname,
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Privatefs: true,
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}
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for _, ns := range spec.Linux.Namespaces {
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t, exists := namespaceMapping[ns.Type]
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if !exists {
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return nil, fmt.Errorf("namespace %q does not exist", ns)
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}
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config.Namespaces.Add(t, ns.Path)
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}
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for _, m := range spec.Mounts {
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config.Mounts = append(config.Mounts, createLibcontainerMount(cwd, m))
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}
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if err := createDevices(spec, config); err != nil {
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return nil, err
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}
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if err := setupUserNamespace(spec, config); err != nil {
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return nil, err
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}
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c, err := createCgroupConfig(spec, config.Devices)
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if err != nil {
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return nil, err
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}
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config.Cgroups = c
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if config.Readonlyfs {
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setReadonly(config)
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config.MaskPaths = []string{
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"/proc/kcore",
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}
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config.ReadonlyPaths = []string{
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"/proc/sys", "/proc/sysrq-trigger", "/proc/irq", "/proc/bus",
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}
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}
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return config, nil
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}
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func createLibcontainerMount(cwd string, m specs.Mount) *configs.Mount {
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flags, data := parseMountOptions(m.Options)
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source := m.Source
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if m.Type == "bind" {
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if !filepath.IsAbs(source) {
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source = filepath.Join(cwd, m.Source)
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}
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}
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return &configs.Mount{
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Device: m.Type,
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Source: source,
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Destination: m.Destination,
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Data: data,
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Flags: flags,
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}
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}
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func createCgroupConfig(spec *specs.LinuxSpec, devices []*configs.Device) (*configs.Cgroup, error) {
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myCgroupPath, err := cgroups.GetThisCgroupDir("devices")
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if err != nil {
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return nil, err
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}
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c := &configs.Cgroup{
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Name: getDefaultID(),
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Parent: myCgroupPath,
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AllowedDevices: append(devices, allowedDevices...),
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}
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r := spec.Linux.Resources
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c.MemoryReservation = r.Memory.Reservation
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c.MemorySwap = r.Memory.Swap
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c.KernelMemory = r.Memory.Kernel
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c.CpuShares = r.CPU.Shares
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c.CpuQuota = r.CPU.Quota
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c.CpuPeriod = r.CPU.Period
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c.CpuRtRuntime = r.CPU.RealtimeRuntime
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c.CpuRtPeriod = r.CPU.RealtimePeriod
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c.CpusetCpus = r.CPU.Cpus
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c.CpusetMems = r.CPU.Mems
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c.BlkioThrottleReadBpsDevice = r.BlockIO.ThrottleReadBpsDevice
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c.BlkioThrottleWriteBpsDevice = r.BlockIO.ThrottleWriteBpsDevice
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c.BlkioThrottleReadIOpsDevice = r.BlockIO.ThrottleReadIOpsDevice
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c.BlkioThrottleWriteIOpsDevice = r.BlockIO.ThrottleWriteIOpsDevice
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c.BlkioWeight = r.BlockIO.Weight
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c.BlkioWeightDevice = r.BlockIO.WeightDevice
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for _, l := range r.HugepageLimits {
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c.HugetlbLimit = append(c.HugetlbLimit, &configs.HugepageLimit{
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Pagesize: l.Pagesize,
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Limit: l.Limit,
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})
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}
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c.OomKillDisable = r.DisableOOMKiller
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c.NetClsClassid = r.Network.ClassID
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for _, m := range r.Network.Priorities {
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c.NetPrioIfpriomap = append(c.NetPrioIfpriomap, &configs.IfPrioMap{
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Interface: m.Name,
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Priority: m.Priority,
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})
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}
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return c, nil
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}
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func createDevices(spec *specs.LinuxSpec, config *configs.Config) error {
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for _, name := range spec.Linux.Devices {
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d, err := devices.DeviceFromPath(filepath.Join("/dev", name), "rwm")
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if err != nil {
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return err
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}
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config.Devices = append(config.Devices, d)
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}
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return nil
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}
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func setReadonly(config *configs.Config) {
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for _, m := range config.Mounts {
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if m.Device == "sysfs" {
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m.Flags |= syscall.MS_RDONLY
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}
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}
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}
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func setupUserNamespace(spec *specs.LinuxSpec, config *configs.Config) error {
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if len(spec.Linux.UidMappings) == 0 {
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return nil
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}
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config.Namespaces.Add(configs.NEWUSER, "")
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create := func(m specs.IDMapping) configs.IDMap {
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return configs.IDMap{
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ContainerID: int(m.From),
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HostID: int(m.To),
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Size: int(m.Count),
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}
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}
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for _, m := range spec.Linux.UidMappings {
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config.UidMappings = append(config.UidMappings, create(m))
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}
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for _, m := range spec.Linux.GidMappings {
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config.GidMappings = append(config.GidMappings, create(m))
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}
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rootUid, err := config.HostUID()
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if err != nil {
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return err
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}
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rootGid, err := config.HostGID()
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if err != nil {
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return err
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}
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for _, node := range config.Devices {
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node.Uid = uint32(rootUid)
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node.Gid = uint32(rootGid)
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}
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return nil
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}
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// parseMountOptions parses the string and returns the flags and any mount data that
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// it contains.
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func parseMountOptions(options string) (int, string) {
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var (
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flag int
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data []string
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)
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flags := map[string]struct {
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clear bool
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flag int
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}{
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"defaults": {false, 0},
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"ro": {false, syscall.MS_RDONLY},
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"rw": {true, syscall.MS_RDONLY},
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"suid": {true, syscall.MS_NOSUID},
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"nosuid": {false, syscall.MS_NOSUID},
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"dev": {true, syscall.MS_NODEV},
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"nodev": {false, syscall.MS_NODEV},
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"exec": {true, syscall.MS_NOEXEC},
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"noexec": {false, syscall.MS_NOEXEC},
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"sync": {false, syscall.MS_SYNCHRONOUS},
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"async": {true, syscall.MS_SYNCHRONOUS},
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"dirsync": {false, syscall.MS_DIRSYNC},
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"remount": {false, syscall.MS_REMOUNT},
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"mand": {false, syscall.MS_MANDLOCK},
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"nomand": {true, syscall.MS_MANDLOCK},
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"atime": {true, syscall.MS_NOATIME},
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"noatime": {false, syscall.MS_NOATIME},
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"diratime": {true, syscall.MS_NODIRATIME},
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"nodiratime": {false, syscall.MS_NODIRATIME},
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"bind": {false, syscall.MS_BIND},
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"rbind": {false, syscall.MS_BIND | syscall.MS_REC},
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"unbindable": {false, syscall.MS_UNBINDABLE},
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"runbindable": {false, syscall.MS_UNBINDABLE | syscall.MS_REC},
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"private": {false, syscall.MS_PRIVATE},
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"rprivate": {false, syscall.MS_PRIVATE | syscall.MS_REC},
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"shared": {false, syscall.MS_SHARED},
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"rshared": {false, syscall.MS_SHARED | syscall.MS_REC},
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"slave": {false, syscall.MS_SLAVE},
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"rslave": {false, syscall.MS_SLAVE | syscall.MS_REC},
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"relatime": {false, syscall.MS_RELATIME},
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"norelatime": {true, syscall.MS_RELATIME},
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"strictatime": {false, syscall.MS_STRICTATIME},
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"nostrictatime": {true, syscall.MS_STRICTATIME},
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}
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for _, o := range strings.Split(options, ",") {
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// If the option does not exist in the flags table or the flag
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// is not supported on the platform,
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// then it is a data value for a specific fs type
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if f, exists := flags[o]; exists && f.flag != 0 {
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if f.clear {
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flag &= ^f.flag
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} else {
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flag |= f.flag
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}
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} else {
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data = append(data, o)
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}
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}
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return flag, strings.Join(data, ",")
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}
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