| package docker |
| |
| import ( |
| "bytes" |
| "encoding/json" |
| "errors" |
| "fmt" |
| "github.com/dotcloud/docker/archive" |
| "github.com/dotcloud/docker/graphdriver" |
| "github.com/dotcloud/docker/mount" |
| "github.com/dotcloud/docker/pkg/term" |
| "github.com/dotcloud/docker/utils" |
| "github.com/kr/pty" |
| "io" |
| "io/ioutil" |
| "log" |
| "net" |
| "os" |
| "os/exec" |
| "path" |
| "strconv" |
| "strings" |
| "sync" |
| "syscall" |
| "time" |
| ) |
| |
| var ( |
| ErrNotATTY = errors.New("The PTY is not a file") |
| ErrNoTTY = errors.New("No PTY found") |
| ) |
| |
| type Container struct { |
| sync.Mutex |
| root string // Path to the "home" of the container, including metadata. |
| rootfs string // Path to the root filesystem of the container. |
| |
| ID string |
| |
| Created time.Time |
| |
| Path string |
| Args []string |
| |
| Config *Config |
| State State |
| Image string |
| |
| network *NetworkInterface |
| NetworkSettings *NetworkSettings |
| |
| ResolvConfPath string |
| HostnamePath string |
| HostsPath string |
| Name string |
| Driver string |
| |
| cmd *exec.Cmd |
| stdout *utils.WriteBroadcaster |
| stderr *utils.WriteBroadcaster |
| stdin io.ReadCloser |
| stdinPipe io.WriteCloser |
| ptyMaster io.Closer |
| |
| runtime *Runtime |
| |
| waitLock chan struct{} |
| Volumes map[string]string |
| // Store rw/ro in a separate structure to preserve reverse-compatibility on-disk. |
| // Easier than migrating older container configs :) |
| VolumesRW map[string]bool |
| hostConfig *HostConfig |
| |
| activeLinks map[string]*Link |
| } |
| |
| // Note: the Config structure should hold only portable information about the container. |
| // Here, "portable" means "independent from the host we are running on". |
| // Non-portable information *should* appear in HostConfig. |
| type Config struct { |
| Hostname string |
| Domainname string |
| User string |
| Memory int64 // Memory limit (in bytes) |
| MemorySwap int64 // Total memory usage (memory + swap); set `-1' to disable swap |
| CpuShares int64 // CPU shares (relative weight vs. other containers) |
| AttachStdin bool |
| AttachStdout bool |
| AttachStderr bool |
| PortSpecs []string // Deprecated - Can be in the format of 8080/tcp |
| ExposedPorts map[Port]struct{} |
| Tty bool // Attach standard streams to a tty, including stdin if it is not closed. |
| OpenStdin bool // Open stdin |
| StdinOnce bool // If true, close stdin after the 1 attached client disconnects. |
| Env []string |
| Cmd []string |
| Dns []string |
| Image string // Name of the image as it was passed by the operator (eg. could be symbolic) |
| Volumes map[string]struct{} |
| VolumesFrom string |
| WorkingDir string |
| Entrypoint []string |
| NetworkDisabled bool |
| } |
| |
| type HostConfig struct { |
| Binds []string |
| ContainerIDFile string |
| LxcConf []KeyValuePair |
| Privileged bool |
| PortBindings map[Port][]PortBinding |
| Links []string |
| PublishAllPorts bool |
| } |
| |
| type BindMap struct { |
| SrcPath string |
| DstPath string |
| Mode string |
| } |
| |
| var ( |
| ErrContainerStart = errors.New("The container failed to start. Unkown error") |
| ErrContainerStartTimeout = errors.New("The container failed to start due to timed out.") |
| ErrInvalidWorikingDirectory = errors.New("The working directory is invalid. It needs to be an absolute path.") |
| ErrConflictAttachDetach = errors.New("Conflicting options: -a and -d") |
| ErrConflictDetachAutoRemove = errors.New("Conflicting options: -rm and -d") |
| ) |
| |
| type KeyValuePair struct { |
| Key string |
| Value string |
| } |
| |
| type PortBinding struct { |
| HostIp string |
| HostPort string |
| } |
| |
| // 80/tcp |
| type Port string |
| |
| func (p Port) Proto() string { |
| parts := strings.Split(string(p), "/") |
| if len(parts) == 1 { |
| return "tcp" |
| } |
| return parts[1] |
| } |
| |
| func (p Port) Port() string { |
| return strings.Split(string(p), "/")[0] |
| } |
| |
| func (p Port) Int() int { |
| i, err := parsePort(p.Port()) |
| if err != nil { |
| panic(err) |
| } |
| return i |
| } |
| |
| func NewPort(proto, port string) Port { |
| return Port(fmt.Sprintf("%s/%s", port, proto)) |
| } |
| |
| type PortMapping map[string]string // Deprecated |
| |
| type NetworkSettings struct { |
| IPAddress string |
| IPPrefixLen int |
| Gateway string |
| Bridge string |
| PortMapping map[string]PortMapping // Deprecated |
| Ports map[Port][]PortBinding |
| } |
| |
| func (settings *NetworkSettings) PortMappingAPI() []APIPort { |
| var mapping []APIPort |
| for port, bindings := range settings.Ports { |
| p, _ := parsePort(port.Port()) |
| if len(bindings) == 0 { |
| mapping = append(mapping, APIPort{ |
| PublicPort: int64(p), |
| Type: port.Proto(), |
| }) |
| continue |
| } |
| for _, binding := range bindings { |
| p, _ := parsePort(port.Port()) |
| h, _ := parsePort(binding.HostPort) |
| mapping = append(mapping, APIPort{ |
| PrivatePort: int64(p), |
| PublicPort: int64(h), |
| Type: port.Proto(), |
| IP: binding.HostIp, |
| }) |
| } |
| } |
| return mapping |
| } |
| |
| // Inject the io.Reader at the given path. Note: do not close the reader |
| func (container *Container) Inject(file io.Reader, pth string) error { |
| if err := container.EnsureMounted(); err != nil { |
| return fmt.Errorf("inject: error mounting container %s: %s", container.ID, err) |
| } |
| |
| // Return error if path exists |
| destPath := path.Join(container.RootfsPath(), pth) |
| if _, err := os.Stat(destPath); err == nil { |
| // Since err is nil, the path could be stat'd and it exists |
| return fmt.Errorf("%s exists", pth) |
| } else if !os.IsNotExist(err) { |
| // Expect err might be that the file doesn't exist, so |
| // if it's some other error, return that. |
| |
| return err |
| } |
| |
| // Make sure the directory exists |
| if err := os.MkdirAll(path.Join(container.RootfsPath(), path.Dir(pth)), 0755); err != nil { |
| return err |
| } |
| |
| dest, err := os.Create(destPath) |
| if err != nil { |
| return err |
| } |
| defer dest.Close() |
| |
| if _, err := io.Copy(dest, file); err != nil { |
| return err |
| } |
| return nil |
| } |
| |
| func (container *Container) Cmd() *exec.Cmd { |
| return container.cmd |
| } |
| |
| func (container *Container) When() time.Time { |
| return container.Created |
| } |
| |
| func (container *Container) FromDisk() error { |
| data, err := ioutil.ReadFile(container.jsonPath()) |
| if err != nil { |
| return err |
| } |
| // Load container settings |
| // udp broke compat of docker.PortMapping, but it's not used when loading a container, we can skip it |
| if err := json.Unmarshal(data, container); err != nil && !strings.Contains(err.Error(), "docker.PortMapping") { |
| return err |
| } |
| return container.readHostConfig() |
| } |
| |
| func (container *Container) ToDisk() (err error) { |
| data, err := json.Marshal(container) |
| if err != nil { |
| return |
| } |
| err = ioutil.WriteFile(container.jsonPath(), data, 0666) |
| if err != nil { |
| return |
| } |
| return container.writeHostConfig() |
| } |
| |
| func (container *Container) readHostConfig() error { |
| container.hostConfig = &HostConfig{} |
| // If the hostconfig file does not exist, do not read it. |
| // (We still have to initialize container.hostConfig, |
| // but that's OK, since we just did that above.) |
| _, err := os.Stat(container.hostConfigPath()) |
| if os.IsNotExist(err) { |
| return nil |
| } |
| data, err := ioutil.ReadFile(container.hostConfigPath()) |
| if err != nil { |
| return err |
| } |
| return json.Unmarshal(data, container.hostConfig) |
| } |
| |
| func (container *Container) writeHostConfig() (err error) { |
| data, err := json.Marshal(container.hostConfig) |
| if err != nil { |
| return |
| } |
| return ioutil.WriteFile(container.hostConfigPath(), data, 0666) |
| } |
| |
| func (container *Container) generateEnvConfig(env []string) error { |
| data, err := json.Marshal(env) |
| if err != nil { |
| return err |
| } |
| p, err := container.EnvConfigPath() |
| if err != nil { |
| return err |
| } |
| ioutil.WriteFile(p, data, 0600) |
| return nil |
| } |
| |
| func (container *Container) generateLXCConfig() error { |
| fo, err := os.Create(container.lxcConfigPath()) |
| if err != nil { |
| return err |
| } |
| defer fo.Close() |
| return LxcTemplateCompiled.Execute(fo, container) |
| } |
| |
| func (container *Container) startPty() error { |
| ptyMaster, ptySlave, err := pty.Open() |
| if err != nil { |
| return err |
| } |
| container.ptyMaster = ptyMaster |
| container.cmd.Stdout = ptySlave |
| container.cmd.Stderr = ptySlave |
| |
| // Copy the PTYs to our broadcasters |
| go func() { |
| defer container.stdout.CloseWriters() |
| utils.Debugf("startPty: begin of stdout pipe") |
| io.Copy(container.stdout, ptyMaster) |
| utils.Debugf("startPty: end of stdout pipe") |
| }() |
| |
| // stdin |
| if container.Config.OpenStdin { |
| container.cmd.Stdin = ptySlave |
| container.cmd.SysProcAttr.Setctty = true |
| go func() { |
| defer container.stdin.Close() |
| utils.Debugf("startPty: begin of stdin pipe") |
| io.Copy(ptyMaster, container.stdin) |
| utils.Debugf("startPty: end of stdin pipe") |
| }() |
| } |
| if err := container.cmd.Start(); err != nil { |
| return err |
| } |
| ptySlave.Close() |
| return nil |
| } |
| |
| func (container *Container) start() error { |
| container.cmd.Stdout = container.stdout |
| container.cmd.Stderr = container.stderr |
| if container.Config.OpenStdin { |
| stdin, err := container.cmd.StdinPipe() |
| if err != nil { |
| return err |
| } |
| go func() { |
| defer stdin.Close() |
| utils.Debugf("start: begin of stdin pipe") |
| io.Copy(stdin, container.stdin) |
| utils.Debugf("start: end of stdin pipe") |
| }() |
| } |
| return container.cmd.Start() |
| } |
| |
| func (container *Container) Attach(stdin io.ReadCloser, stdinCloser io.Closer, stdout io.Writer, stderr io.Writer) chan error { |
| var cStdout, cStderr io.ReadCloser |
| |
| var nJobs int |
| errors := make(chan error, 3) |
| if stdin != nil && container.Config.OpenStdin { |
| nJobs += 1 |
| if cStdin, err := container.StdinPipe(); err != nil { |
| errors <- err |
| } else { |
| go func() { |
| utils.Debugf("attach: stdin: begin") |
| defer utils.Debugf("attach: stdin: end") |
| // No matter what, when stdin is closed (io.Copy unblock), close stdout and stderr |
| if container.Config.StdinOnce && !container.Config.Tty { |
| defer cStdin.Close() |
| } else { |
| if cStdout != nil { |
| defer cStdout.Close() |
| } |
| if cStderr != nil { |
| defer cStderr.Close() |
| } |
| } |
| if container.Config.Tty { |
| _, err = utils.CopyEscapable(cStdin, stdin) |
| } else { |
| _, err = io.Copy(cStdin, stdin) |
| } |
| if err == io.ErrClosedPipe { |
| err = nil |
| } |
| if err != nil { |
| utils.Errorf("attach: stdin: %s", err) |
| } |
| errors <- err |
| }() |
| } |
| } |
| if stdout != nil { |
| nJobs += 1 |
| if p, err := container.StdoutPipe(); err != nil { |
| errors <- err |
| } else { |
| cStdout = p |
| go func() { |
| utils.Debugf("attach: stdout: begin") |
| defer utils.Debugf("attach: stdout: end") |
| // If we are in StdinOnce mode, then close stdin |
| if container.Config.StdinOnce && stdin != nil { |
| defer stdin.Close() |
| } |
| if stdinCloser != nil { |
| defer stdinCloser.Close() |
| } |
| _, err := io.Copy(stdout, cStdout) |
| if err == io.ErrClosedPipe { |
| err = nil |
| } |
| if err != nil { |
| utils.Errorf("attach: stdout: %s", err) |
| } |
| errors <- err |
| }() |
| } |
| } else { |
| go func() { |
| if stdinCloser != nil { |
| defer stdinCloser.Close() |
| } |
| if cStdout, err := container.StdoutPipe(); err != nil { |
| utils.Errorf("attach: stdout pipe: %s", err) |
| } else { |
| io.Copy(&utils.NopWriter{}, cStdout) |
| } |
| }() |
| } |
| if stderr != nil { |
| nJobs += 1 |
| if p, err := container.StderrPipe(); err != nil { |
| errors <- err |
| } else { |
| cStderr = p |
| go func() { |
| utils.Debugf("attach: stderr: begin") |
| defer utils.Debugf("attach: stderr: end") |
| // If we are in StdinOnce mode, then close stdin |
| if container.Config.StdinOnce && stdin != nil { |
| defer stdin.Close() |
| } |
| if stdinCloser != nil { |
| defer stdinCloser.Close() |
| } |
| _, err := io.Copy(stderr, cStderr) |
| if err == io.ErrClosedPipe { |
| err = nil |
| } |
| if err != nil { |
| utils.Errorf("attach: stderr: %s", err) |
| } |
| errors <- err |
| }() |
| } |
| } else { |
| go func() { |
| if stdinCloser != nil { |
| defer stdinCloser.Close() |
| } |
| |
| if cStderr, err := container.StderrPipe(); err != nil { |
| utils.Errorf("attach: stdout pipe: %s", err) |
| } else { |
| io.Copy(&utils.NopWriter{}, cStderr) |
| } |
| }() |
| } |
| |
| return utils.Go(func() error { |
| if cStdout != nil { |
| defer cStdout.Close() |
| } |
| if cStderr != nil { |
| defer cStderr.Close() |
| } |
| // FIXME: how to clean up the stdin goroutine without the unwanted side effect |
| // of closing the passed stdin? Add an intermediary io.Pipe? |
| for i := 0; i < nJobs; i += 1 { |
| utils.Debugf("attach: waiting for job %d/%d", i+1, nJobs) |
| if err := <-errors; err != nil { |
| utils.Errorf("attach: job %d returned error %s, aborting all jobs", i+1, err) |
| return err |
| } |
| utils.Debugf("attach: job %d completed successfully", i+1) |
| } |
| utils.Debugf("attach: all jobs completed successfully") |
| return nil |
| }) |
| } |
| |
| func (container *Container) Start() (err error) { |
| container.Lock() |
| defer container.Unlock() |
| |
| if container.State.IsRunning() { |
| return fmt.Errorf("The container %s is already running.", container.ID) |
| } |
| defer func() { |
| if err != nil { |
| container.cleanup() |
| } |
| }() |
| if err := container.EnsureMounted(); err != nil { |
| return err |
| } |
| if container.runtime.networkManager.disabled { |
| container.Config.NetworkDisabled = true |
| container.buildHostnameAndHostsFiles("127.0.1.1") |
| } else { |
| if err := container.allocateNetwork(); err != nil { |
| return err |
| } |
| container.buildHostnameAndHostsFiles(container.NetworkSettings.IPAddress) |
| } |
| |
| // Make sure the config is compatible with the current kernel |
| if container.Config.Memory > 0 && !container.runtime.capabilities.MemoryLimit { |
| log.Printf("WARNING: Your kernel does not support memory limit capabilities. Limitation discarded.\n") |
| container.Config.Memory = 0 |
| } |
| if container.Config.Memory > 0 && !container.runtime.capabilities.SwapLimit { |
| log.Printf("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.\n") |
| container.Config.MemorySwap = -1 |
| } |
| |
| if container.runtime.capabilities.IPv4ForwardingDisabled { |
| log.Printf("WARNING: IPv4 forwarding is disabled. Networking will not work") |
| } |
| |
| if container.Volumes == nil || len(container.Volumes) == 0 { |
| container.Volumes = make(map[string]string) |
| container.VolumesRW = make(map[string]bool) |
| } |
| |
| // Apply volumes from another container if requested |
| if err := container.applyExternalVolumes(); err != nil { |
| return err |
| } |
| |
| if err := container.createVolumes(); err != nil { |
| return err |
| } |
| |
| if err := container.generateLXCConfig(); err != nil { |
| return err |
| } |
| |
| var lxcStart string = "lxc-start" |
| if container.hostConfig.Privileged && container.runtime.capabilities.AppArmor { |
| lxcStart = path.Join(container.runtime.config.Root, "lxc-start-unconfined") |
| } |
| |
| params := []string{ |
| lxcStart, |
| "-n", container.ID, |
| "-f", container.lxcConfigPath(), |
| "--", |
| "/.dockerinit", |
| } |
| |
| // Networking |
| if !container.Config.NetworkDisabled { |
| network := container.NetworkSettings |
| params = append(params, |
| "-g", network.Gateway, |
| "-i", fmt.Sprintf("%s/%d", network.IPAddress, network.IPPrefixLen), |
| "-mtu", strconv.Itoa(container.runtime.config.Mtu), |
| ) |
| } |
| |
| // User |
| if container.Config.User != "" { |
| params = append(params, "-u", container.Config.User) |
| } |
| |
| // Setup environment |
| env := []string{ |
| "HOME=/", |
| "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin", |
| "HOSTNAME=" + container.Config.Hostname, |
| } |
| |
| if container.Config.Tty { |
| env = append(env, "TERM=xterm") |
| } |
| |
| if container.hostConfig.Privileged { |
| params = append(params, "-privileged") |
| } |
| |
| // Init any links between the parent and children |
| runtime := container.runtime |
| |
| children, err := runtime.Children(container.Name) |
| if err != nil { |
| return err |
| } |
| |
| if len(children) > 0 { |
| container.activeLinks = make(map[string]*Link, len(children)) |
| |
| // If we encounter an error make sure that we rollback any network |
| // config and ip table changes |
| rollback := func() { |
| for _, link := range container.activeLinks { |
| link.Disable() |
| } |
| container.activeLinks = nil |
| } |
| |
| for p, child := range children { |
| link, err := NewLink(container, child, p, runtime.networkManager.bridgeIface) |
| if err != nil { |
| rollback() |
| return err |
| } |
| |
| container.activeLinks[link.Alias()] = link |
| if err := link.Enable(); err != nil { |
| rollback() |
| return err |
| } |
| |
| for _, envVar := range link.ToEnv() { |
| env = append(env, envVar) |
| } |
| } |
| } |
| |
| for _, elem := range container.Config.Env { |
| env = append(env, elem) |
| } |
| |
| if err := container.generateEnvConfig(env); err != nil { |
| return err |
| } |
| |
| if container.Config.WorkingDir != "" { |
| workingDir := path.Clean(container.Config.WorkingDir) |
| utils.Debugf("[working dir] working dir is %s", workingDir) |
| |
| if err := os.MkdirAll(path.Join(container.RootfsPath(), workingDir), 0755); err != nil { |
| return nil |
| } |
| |
| params = append(params, |
| "-w", workingDir, |
| ) |
| } |
| |
| // Program |
| params = append(params, "--", container.Path) |
| params = append(params, container.Args...) |
| |
| if RootIsShared() { |
| // lxc-start really needs / to be non-shared, or all kinds of stuff break |
| // when lxc-start unmount things and those unmounts propagate to the main |
| // mount namespace. |
| // What we really want is to clone into a new namespace and then |
| // mount / MS_REC|MS_SLAVE, but since we can't really clone or fork |
| // without exec in go we have to do this horrible shell hack... |
| shellString := |
| "mount --make-rslave /; exec " + |
| utils.ShellQuoteArguments(params) |
| |
| params = []string{ |
| "unshare", "-m", "--", "/bin/sh", "-c", shellString, |
| } |
| } |
| |
| root := container.RootfsPath() |
| envPath, err := container.EnvConfigPath() |
| if err != nil { |
| return err |
| } |
| |
| // Mount docker specific files into the containers root fs |
| if err := mount.Mount(runtime.sysInitPath, path.Join(root, "/.dockerinit"), "none", "bind,ro"); err != nil { |
| return err |
| } |
| if err := mount.Mount(envPath, path.Join(root, "/.dockerenv"), "none", "bind,ro"); err != nil { |
| return err |
| } |
| if err := mount.Mount(container.ResolvConfPath, path.Join(root, "/etc/resolv.conf"), "none", "bind,ro"); err != nil { |
| return err |
| } |
| |
| if container.HostnamePath != "" && container.HostsPath != "" { |
| if err := mount.Mount(container.HostnamePath, path.Join(root, "/etc/hostname"), "none", "bind,ro"); err != nil { |
| return err |
| } |
| if err := mount.Mount(container.HostsPath, path.Join(root, "/etc/hosts"), "none", "bind,ro"); err != nil { |
| return err |
| } |
| } |
| |
| // Mount user specified volumes |
| |
| for r, v := range container.Volumes { |
| mountAs := "ro" |
| if container.VolumesRW[v] { |
| mountAs = "rw" |
| } |
| |
| if err := mount.Mount(v, path.Join(root, r), "none", fmt.Sprintf("bind,%s", mountAs)); err != nil { |
| return err |
| } |
| } |
| |
| container.cmd = exec.Command(params[0], params[1:]...) |
| |
| // Setup logging of stdout and stderr to disk |
| if err := container.runtime.LogToDisk(container.stdout, container.logPath("json"), "stdout"); err != nil { |
| return err |
| } |
| if err := container.runtime.LogToDisk(container.stderr, container.logPath("json"), "stderr"); err != nil { |
| return err |
| } |
| |
| container.cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true} |
| |
| if container.Config.Tty { |
| err = container.startPty() |
| } else { |
| err = container.start() |
| } |
| if err != nil { |
| return err |
| } |
| // FIXME: save state on disk *first*, then converge |
| // this way disk state is used as a journal, eg. we can restore after crash etc. |
| container.State.SetRunning(container.cmd.Process.Pid) |
| |
| // Init the lock |
| container.waitLock = make(chan struct{}) |
| |
| container.ToDisk() |
| go container.monitor() |
| |
| defer utils.Debugf("Container running: %v", container.State.IsRunning()) |
| // We wait for the container to be fully running. |
| // Timeout after 5 seconds. In case of broken pipe, just retry. |
| // Note: The container can run and finish correctly before |
| // the end of this loop |
| for now := time.Now(); time.Since(now) < 5*time.Second; { |
| // If the container dies while waiting for it, just return |
| if !container.State.IsRunning() { |
| return nil |
| } |
| output, err := exec.Command("lxc-info", "-s", "-n", container.ID).CombinedOutput() |
| if err != nil { |
| utils.Debugf("Error with lxc-info: %s (%s)", err, output) |
| |
| output, err = exec.Command("lxc-info", "-s", "-n", container.ID).CombinedOutput() |
| if err != nil { |
| utils.Debugf("Second Error with lxc-info: %s (%s)", err, output) |
| return err |
| } |
| |
| } |
| if strings.Contains(string(output), "RUNNING") { |
| return nil |
| } |
| utils.Debugf("Waiting for the container to start (running: %v): %s", container.State.IsRunning(), bytes.TrimSpace(output)) |
| time.Sleep(50 * time.Millisecond) |
| } |
| |
| if container.State.IsRunning() { |
| return ErrContainerStartTimeout |
| } |
| return ErrContainerStart |
| } |
| |
| func (container *Container) getBindMap() (map[string]BindMap, error) { |
| // Create the requested bind mounts |
| binds := make(map[string]BindMap) |
| // Define illegal container destinations |
| illegalDsts := []string{"/", "."} |
| |
| for _, bind := range container.hostConfig.Binds { |
| // FIXME: factorize bind parsing in parseBind |
| var src, dst, mode string |
| arr := strings.Split(bind, ":") |
| if len(arr) == 2 { |
| src = arr[0] |
| dst = arr[1] |
| mode = "rw" |
| } else if len(arr) == 3 { |
| src = arr[0] |
| dst = arr[1] |
| mode = arr[2] |
| } else { |
| return nil, fmt.Errorf("Invalid bind specification: %s", bind) |
| } |
| |
| // Bail if trying to mount to an illegal destination |
| for _, illegal := range illegalDsts { |
| if dst == illegal { |
| return nil, fmt.Errorf("Illegal bind destination: %s", dst) |
| } |
| } |
| |
| bindMap := BindMap{ |
| SrcPath: src, |
| DstPath: dst, |
| Mode: mode, |
| } |
| binds[path.Clean(dst)] = bindMap |
| } |
| return binds, nil |
| } |
| |
| func (container *Container) createVolumes() error { |
| binds, err := container.getBindMap() |
| if err != nil { |
| return err |
| } |
| volumesDriver := container.runtime.volumes.driver |
| // Create the requested volumes if they don't exist |
| for volPath := range container.Config.Volumes { |
| volPath = path.Clean(volPath) |
| volIsDir := true |
| // Skip existing volumes |
| if _, exists := container.Volumes[volPath]; exists { |
| continue |
| } |
| var srcPath string |
| var isBindMount bool |
| srcRW := false |
| // If an external bind is defined for this volume, use that as a source |
| if bindMap, exists := binds[volPath]; exists { |
| isBindMount = true |
| srcPath = bindMap.SrcPath |
| if strings.ToLower(bindMap.Mode) == "rw" { |
| srcRW = true |
| } |
| if stat, err := os.Lstat(bindMap.SrcPath); err != nil { |
| return err |
| } else { |
| volIsDir = stat.IsDir() |
| } |
| // Otherwise create an directory in $ROOT/volumes/ and use that |
| } else { |
| |
| // Do not pass a container as the parameter for the volume creation. |
| // The graph driver using the container's information ( Image ) to |
| // create the parent. |
| c, err := container.runtime.volumes.Create(nil, nil, "", "", nil) |
| if err != nil { |
| return err |
| } |
| srcPath, err = volumesDriver.Get(c.ID) |
| if err != nil { |
| return fmt.Errorf("Driver %s failed to get volume rootfs %s: %s", volumesDriver, c.ID, err) |
| } |
| srcRW = true // RW by default |
| } |
| container.Volumes[volPath] = srcPath |
| container.VolumesRW[volPath] = srcRW |
| |
| // Create the mountpoint |
| volPath = path.Join(container.RootfsPath(), volPath) |
| rootVolPath, err := utils.FollowSymlinkInScope(volPath, container.RootfsPath()) |
| if err != nil { |
| return err |
| } |
| |
| if _, err := os.Stat(rootVolPath); err != nil { |
| if os.IsNotExist(err) { |
| if volIsDir { |
| if err := os.MkdirAll(rootVolPath, 0755); err != nil { |
| return err |
| } |
| } else { |
| if err := os.MkdirAll(path.Dir(rootVolPath), 0755); err != nil { |
| return err |
| } |
| if f, err := os.OpenFile(rootVolPath, os.O_CREATE, 0755); err != nil { |
| return err |
| } else { |
| f.Close() |
| } |
| } |
| } |
| } |
| |
| // Do not copy or change permissions if we are mounting from the host |
| if srcRW && !isBindMount { |
| volList, err := ioutil.ReadDir(rootVolPath) |
| if err != nil { |
| return err |
| } |
| if len(volList) > 0 { |
| srcList, err := ioutil.ReadDir(srcPath) |
| if err != nil { |
| return err |
| } |
| if len(srcList) == 0 { |
| // If the source volume is empty copy files from the root into the volume |
| if err := archive.CopyWithTar(rootVolPath, srcPath); err != nil { |
| return err |
| } |
| |
| var stat syscall.Stat_t |
| if err := syscall.Stat(rootVolPath, &stat); err != nil { |
| return err |
| } |
| var srcStat syscall.Stat_t |
| if err := syscall.Stat(srcPath, &srcStat); err != nil { |
| return err |
| } |
| // Change the source volume's ownership if it differs from the root |
| // files that where just copied |
| if stat.Uid != srcStat.Uid || stat.Gid != srcStat.Gid { |
| if err := os.Chown(srcPath, int(stat.Uid), int(stat.Gid)); err != nil { |
| return err |
| } |
| } |
| } |
| } |
| } |
| } |
| return nil |
| } |
| |
| func (container *Container) applyExternalVolumes() error { |
| if container.Config.VolumesFrom != "" { |
| containerSpecs := strings.Split(container.Config.VolumesFrom, ",") |
| for _, containerSpec := range containerSpecs { |
| mountRW := true |
| specParts := strings.SplitN(containerSpec, ":", 2) |
| switch len(specParts) { |
| case 0: |
| return fmt.Errorf("Malformed volumes-from specification: %s", container.Config.VolumesFrom) |
| case 2: |
| switch specParts[1] { |
| case "ro": |
| mountRW = false |
| case "rw": // mountRW is already true |
| default: |
| return fmt.Errorf("Malformed volumes-from speficication: %s", containerSpec) |
| } |
| } |
| c := container.runtime.Get(specParts[0]) |
| if c == nil { |
| return fmt.Errorf("Container %s not found. Impossible to mount its volumes", container.ID) |
| } |
| for volPath, id := range c.Volumes { |
| if _, exists := container.Volumes[volPath]; exists { |
| continue |
| } |
| if err := os.MkdirAll(path.Join(container.RootfsPath(), volPath), 0755); err != nil { |
| return err |
| } |
| container.Volumes[volPath] = id |
| if isRW, exists := c.VolumesRW[volPath]; exists { |
| container.VolumesRW[volPath] = isRW && mountRW |
| } |
| } |
| |
| } |
| } |
| return nil |
| } |
| |
| func (container *Container) Run() error { |
| if err := container.Start(); err != nil { |
| return err |
| } |
| container.Wait() |
| return nil |
| } |
| |
| func (container *Container) Output() (output []byte, err error) { |
| pipe, err := container.StdoutPipe() |
| if err != nil { |
| return nil, err |
| } |
| defer pipe.Close() |
| if err := container.Start(); err != nil { |
| return nil, err |
| } |
| output, err = ioutil.ReadAll(pipe) |
| container.Wait() |
| return output, err |
| } |
| |
| // Container.StdinPipe returns a WriteCloser which can be used to feed data |
| // to the standard input of the container's active process. |
| // Container.StdoutPipe and Container.StderrPipe each return a ReadCloser |
| // which can be used to retrieve the standard output (and error) generated |
| // by the container's active process. The output (and error) are actually |
| // copied and delivered to all StdoutPipe and StderrPipe consumers, using |
| // a kind of "broadcaster". |
| |
| func (container *Container) StdinPipe() (io.WriteCloser, error) { |
| return container.stdinPipe, nil |
| } |
| |
| func (container *Container) StdoutPipe() (io.ReadCloser, error) { |
| reader, writer := io.Pipe() |
| container.stdout.AddWriter(writer, "") |
| return utils.NewBufReader(reader), nil |
| } |
| |
| func (container *Container) StderrPipe() (io.ReadCloser, error) { |
| reader, writer := io.Pipe() |
| container.stderr.AddWriter(writer, "") |
| return utils.NewBufReader(reader), nil |
| } |
| |
| func (container *Container) buildHostnameAndHostsFiles(IP string) { |
| container.HostnamePath = path.Join(container.root, "hostname") |
| ioutil.WriteFile(container.HostnamePath, []byte(container.Config.Hostname+"\n"), 0644) |
| |
| hostsContent := []byte(` |
| 127.0.0.1 localhost |
| ::1 localhost ip6-localhost ip6-loopback |
| fe00::0 ip6-localnet |
| ff00::0 ip6-mcastprefix |
| ff02::1 ip6-allnodes |
| ff02::2 ip6-allrouters |
| `) |
| |
| container.HostsPath = path.Join(container.root, "hosts") |
| |
| if container.Config.Domainname != "" { |
| hostsContent = append([]byte(fmt.Sprintf("%s\t%s.%s %s\n", IP, container.Config.Hostname, container.Config.Domainname, container.Config.Hostname)), hostsContent...) |
| } else { |
| hostsContent = append([]byte(fmt.Sprintf("%s\t%s\n", IP, container.Config.Hostname)), hostsContent...) |
| } |
| |
| ioutil.WriteFile(container.HostsPath, hostsContent, 0644) |
| } |
| |
| func (container *Container) allocateNetwork() error { |
| if container.Config.NetworkDisabled { |
| return nil |
| } |
| |
| var ( |
| iface *NetworkInterface |
| err error |
| ) |
| if container.State.IsGhost() { |
| if manager := container.runtime.networkManager; manager.disabled { |
| iface = &NetworkInterface{disabled: true} |
| } else { |
| iface = &NetworkInterface{ |
| IPNet: net.IPNet{IP: net.ParseIP(container.NetworkSettings.IPAddress), Mask: manager.bridgeNetwork.Mask}, |
| Gateway: manager.bridgeNetwork.IP, |
| manager: manager, |
| } |
| if iface != nil && iface.IPNet.IP != nil { |
| ipNum := ipToInt(iface.IPNet.IP) |
| manager.ipAllocator.inUse[ipNum] = struct{}{} |
| } else { |
| iface, err = container.runtime.networkManager.Allocate() |
| if err != nil { |
| return err |
| } |
| } |
| } |
| } else { |
| iface, err = container.runtime.networkManager.Allocate() |
| if err != nil { |
| return err |
| } |
| } |
| |
| if container.Config.PortSpecs != nil { |
| utils.Debugf("Migrating port mappings for container: %s", strings.Join(container.Config.PortSpecs, ", ")) |
| if err := migratePortMappings(container.Config, container.hostConfig); err != nil { |
| return err |
| } |
| container.Config.PortSpecs = nil |
| if err := container.writeHostConfig(); err != nil { |
| return err |
| } |
| } |
| |
| var ( |
| portSpecs = make(map[Port]struct{}) |
| bindings = make(map[Port][]PortBinding) |
| ) |
| |
| if !container.State.IsGhost() { |
| if container.Config.ExposedPorts != nil { |
| portSpecs = container.Config.ExposedPorts |
| } |
| if container.hostConfig.PortBindings != nil { |
| bindings = container.hostConfig.PortBindings |
| } |
| } else { |
| if container.NetworkSettings.Ports != nil { |
| for port, binding := range container.NetworkSettings.Ports { |
| portSpecs[port] = struct{}{} |
| bindings[port] = binding |
| } |
| } |
| } |
| |
| container.NetworkSettings.PortMapping = nil |
| |
| for port := range portSpecs { |
| binding := bindings[port] |
| if container.hostConfig.PublishAllPorts && len(binding) == 0 { |
| binding = append(binding, PortBinding{}) |
| } |
| for i := 0; i < len(binding); i++ { |
| b := binding[i] |
| nat, err := iface.AllocatePort(port, b) |
| if err != nil { |
| iface.Release() |
| return err |
| } |
| utils.Debugf("Allocate port: %s:%s->%s", nat.Binding.HostIp, port, nat.Binding.HostPort) |
| binding[i] = nat.Binding |
| } |
| bindings[port] = binding |
| } |
| container.writeHostConfig() |
| |
| container.NetworkSettings.Ports = bindings |
| container.network = iface |
| |
| container.NetworkSettings.Bridge = container.runtime.networkManager.bridgeIface |
| container.NetworkSettings.IPAddress = iface.IPNet.IP.String() |
| container.NetworkSettings.IPPrefixLen, _ = iface.IPNet.Mask.Size() |
| container.NetworkSettings.Gateway = iface.Gateway.String() |
| |
| return nil |
| } |
| |
| func (container *Container) releaseNetwork() { |
| if container.Config.NetworkDisabled || container.network == nil { |
| return |
| } |
| container.network.Release() |
| container.network = nil |
| container.NetworkSettings = &NetworkSettings{} |
| } |
| |
| // FIXME: replace this with a control socket within dockerinit |
| func (container *Container) waitLxc() error { |
| for { |
| output, err := exec.Command("lxc-info", "-n", container.ID).CombinedOutput() |
| if err != nil { |
| return err |
| } |
| if !strings.Contains(string(output), "RUNNING") { |
| return nil |
| } |
| time.Sleep(500 * time.Millisecond) |
| } |
| } |
| |
| func (container *Container) monitor() { |
| // Wait for the program to exit |
| |
| // If the command does not exist, try to wait via lxc |
| // (This probably happens only for ghost containers, i.e. containers that were running when Docker started) |
| if container.cmd == nil { |
| utils.Debugf("monitor: waiting for container %s using waitLxc", container.ID) |
| if err := container.waitLxc(); err != nil { |
| utils.Errorf("monitor: while waiting for container %s, waitLxc had a problem: %s", container.ID, err) |
| } |
| } else { |
| utils.Debugf("monitor: waiting for container %s using cmd.Wait", container.ID) |
| if err := container.cmd.Wait(); err != nil { |
| // Since non-zero exit status and signal terminations will cause err to be non-nil, |
| // we have to actually discard it. Still, log it anyway, just in case. |
| utils.Debugf("monitor: cmd.Wait reported exit status %s for container %s", err, container.ID) |
| } |
| } |
| utils.Debugf("monitor: container %s finished", container.ID) |
| |
| exitCode := -1 |
| if container.cmd != nil { |
| exitCode = container.cmd.ProcessState.Sys().(syscall.WaitStatus).ExitStatus() |
| } |
| |
| if container.runtime != nil && container.runtime.srv != nil { |
| container.runtime.srv.LogEvent("die", container.ID, container.runtime.repositories.ImageName(container.Image)) |
| } |
| |
| // Cleanup |
| container.cleanup() |
| |
| // Re-create a brand new stdin pipe once the container exited |
| if container.Config.OpenStdin { |
| container.stdin, container.stdinPipe = io.Pipe() |
| } |
| |
| // Report status back |
| container.State.SetStopped(exitCode) |
| |
| // Release the lock |
| close(container.waitLock) |
| |
| if err := container.ToDisk(); err != nil { |
| // FIXME: there is a race condition here which causes this to fail during the unit tests. |
| // If another goroutine was waiting for Wait() to return before removing the container's root |
| // from the filesystem... At this point it may already have done so. |
| // This is because State.setStopped() has already been called, and has caused Wait() |
| // to return. |
| // FIXME: why are we serializing running state to disk in the first place? |
| //log.Printf("%s: Failed to dump configuration to the disk: %s", container.ID, err) |
| } |
| } |
| |
| func (container *Container) cleanup() { |
| container.releaseNetwork() |
| |
| // Disable all active links |
| if container.activeLinks != nil { |
| for _, link := range container.activeLinks { |
| link.Disable() |
| } |
| } |
| |
| if container.Config.OpenStdin { |
| if err := container.stdin.Close(); err != nil { |
| utils.Errorf("%s: Error close stdin: %s", container.ID, err) |
| } |
| } |
| if err := container.stdout.CloseWriters(); err != nil { |
| utils.Errorf("%s: Error close stdout: %s", container.ID, err) |
| } |
| if err := container.stderr.CloseWriters(); err != nil { |
| utils.Errorf("%s: Error close stderr: %s", container.ID, err) |
| } |
| |
| if container.ptyMaster != nil { |
| if err := container.ptyMaster.Close(); err != nil { |
| utils.Errorf("%s: Error closing Pty master: %s", container.ID, err) |
| } |
| } |
| |
| if err := container.Unmount(); err != nil { |
| log.Printf("%v: Failed to umount filesystem: %v", container.ID, err) |
| } |
| } |
| |
| func (container *Container) kill(sig int) error { |
| container.Lock() |
| defer container.Unlock() |
| |
| if !container.State.IsRunning() { |
| return nil |
| } |
| |
| if output, err := exec.Command("lxc-kill", "-n", container.ID, strconv.Itoa(sig)).CombinedOutput(); err != nil { |
| log.Printf("error killing container %s (%s, %s)", utils.TruncateID(container.ID), output, err) |
| return err |
| } |
| |
| return nil |
| } |
| |
| func (container *Container) Kill() error { |
| if !container.State.IsRunning() { |
| return nil |
| } |
| |
| // 1. Send SIGKILL |
| if err := container.kill(9); err != nil { |
| return err |
| } |
| |
| // 2. Wait for the process to die, in last resort, try to kill the process directly |
| if err := container.WaitTimeout(10 * time.Second); err != nil { |
| if container.cmd == nil { |
| return fmt.Errorf("lxc-kill failed, impossible to kill the container %s", utils.TruncateID(container.ID)) |
| } |
| log.Printf("Container %s failed to exit within 10 seconds of lxc-kill %s - trying direct SIGKILL", "SIGKILL", utils.TruncateID(container.ID)) |
| if err := container.cmd.Process.Kill(); err != nil { |
| return err |
| } |
| } |
| |
| container.Wait() |
| return nil |
| } |
| |
| func (container *Container) Stop(seconds int) error { |
| if !container.State.IsRunning() { |
| return nil |
| } |
| |
| // 1. Send a SIGTERM |
| if err := container.kill(15); err != nil { |
| utils.Debugf("Error sending kill SIGTERM: %s", err) |
| log.Print("Failed to send SIGTERM to the process, force killing") |
| if err := container.kill(9); err != nil { |
| return err |
| } |
| } |
| |
| // 2. Wait for the process to exit on its own |
| if err := container.WaitTimeout(time.Duration(seconds) * time.Second); err != nil { |
| log.Printf("Container %v failed to exit within %d seconds of SIGTERM - using the force", container.ID, seconds) |
| // 3. If it doesn't, then send SIGKILL |
| if err := container.Kill(); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func (container *Container) Restart(seconds int) error { |
| if err := container.Stop(seconds); err != nil { |
| return err |
| } |
| return container.Start() |
| } |
| |
| // Wait blocks until the container stops running, then returns its exit code. |
| func (container *Container) Wait() int { |
| <-container.waitLock |
| return container.State.GetExitCode() |
| } |
| |
| func (container *Container) Resize(h, w int) error { |
| pty, ok := container.ptyMaster.(*os.File) |
| if !ok { |
| return fmt.Errorf("ptyMaster does not have Fd() method") |
| } |
| return term.SetWinsize(pty.Fd(), &term.Winsize{Height: uint16(h), Width: uint16(w)}) |
| } |
| |
| func (container *Container) ExportRw() (archive.Archive, error) { |
| if err := container.EnsureMounted(); err != nil { |
| return nil, err |
| } |
| if container.runtime == nil { |
| return nil, fmt.Errorf("Can't load storage driver for unregistered container %s", container.ID) |
| } |
| |
| return container.runtime.Diff(container) |
| } |
| |
| func (container *Container) Export() (archive.Archive, error) { |
| if err := container.EnsureMounted(); err != nil { |
| return nil, err |
| } |
| return archive.Tar(container.RootfsPath(), archive.Uncompressed) |
| } |
| |
| func (container *Container) WaitTimeout(timeout time.Duration) error { |
| done := make(chan bool) |
| go func() { |
| container.Wait() |
| done <- true |
| }() |
| |
| select { |
| case <-time.After(timeout): |
| return fmt.Errorf("Timed Out") |
| case <-done: |
| return nil |
| } |
| } |
| |
| func (container *Container) EnsureMounted() error { |
| // FIXME: EnsureMounted is deprecated because drivers are now responsible |
| // for re-entrant mounting in their Get() method. |
| return container.Mount() |
| } |
| |
| func (container *Container) Mount() error { |
| return container.runtime.Mount(container) |
| } |
| |
| func (container *Container) Changes() ([]archive.Change, error) { |
| return container.runtime.Changes(container) |
| } |
| |
| func (container *Container) GetImage() (*Image, error) { |
| if container.runtime == nil { |
| return nil, fmt.Errorf("Can't get image of unregistered container") |
| } |
| return container.runtime.graph.Get(container.Image) |
| } |
| |
| func (container *Container) Unmount() error { |
| var ( |
| err error |
| root = container.RootfsPath() |
| mounts = []string{ |
| path.Join(root, "/.dockerinit"), |
| path.Join(root, "/.dockerenv"), |
| path.Join(root, "/etc/resolv.conf"), |
| } |
| ) |
| |
| if container.HostnamePath != "" && container.HostsPath != "" { |
| mounts = append(mounts, path.Join(root, "/etc/hostname"), path.Join(root, "/etc/hosts")) |
| } |
| |
| for r := range container.Volumes { |
| mounts = append(mounts, path.Join(root, r)) |
| } |
| |
| for _, m := range mounts { |
| if lastError := mount.Unmount(m); lastError != nil { |
| err = lastError |
| } |
| } |
| if err != nil { |
| return err |
| } |
| return container.runtime.Unmount(container) |
| } |
| |
| func (container *Container) logPath(name string) string { |
| return path.Join(container.root, fmt.Sprintf("%s-%s.log", container.ID, name)) |
| } |
| |
| func (container *Container) ReadLog(name string) (io.Reader, error) { |
| return os.Open(container.logPath(name)) |
| } |
| |
| func (container *Container) hostConfigPath() string { |
| return path.Join(container.root, "hostconfig.json") |
| } |
| |
| func (container *Container) jsonPath() string { |
| return path.Join(container.root, "config.json") |
| } |
| |
| func (container *Container) EnvConfigPath() (string, error) { |
| p := path.Join(container.root, "config.env") |
| if _, err := os.Stat(p); err != nil { |
| if os.IsNotExist(err) { |
| f, err := os.Create(p) |
| if err != nil { |
| return "", err |
| } |
| f.Close() |
| } else { |
| return "", err |
| } |
| } |
| return p, nil |
| } |
| |
| func (container *Container) lxcConfigPath() string { |
| return path.Join(container.root, "config.lxc") |
| } |
| |
| // This method must be exported to be used from the lxc template |
| func (container *Container) RootfsPath() string { |
| return container.rootfs |
| } |
| |
| func validateID(id string) error { |
| if id == "" { |
| return fmt.Errorf("Invalid empty id") |
| } |
| return nil |
| } |
| |
| // GetSize, return real size, virtual size |
| func (container *Container) GetSize() (int64, int64) { |
| var ( |
| sizeRw, sizeRootfs int64 |
| err error |
| driver = container.runtime.driver |
| ) |
| |
| if err := container.EnsureMounted(); err != nil { |
| utils.Errorf("Warning: failed to compute size of container rootfs %s: %s", container.ID, err) |
| return sizeRw, sizeRootfs |
| } |
| |
| if differ, ok := container.runtime.driver.(graphdriver.Differ); ok { |
| sizeRw, err = differ.DiffSize(container.ID) |
| if err != nil { |
| utils.Errorf("Warning: driver %s couldn't return diff size of container %s: %s", driver, container.ID, err) |
| // FIXME: GetSize should return an error. Not changing it now in case |
| // there is a side-effect. |
| sizeRw = -1 |
| } |
| } else { |
| changes, _ := container.Changes() |
| if changes != nil { |
| sizeRw = archive.ChangesSize(container.RootfsPath(), changes) |
| } else { |
| sizeRw = -1 |
| } |
| } |
| |
| if _, err = os.Stat(container.RootfsPath()); err != nil { |
| if sizeRootfs, err = utils.TreeSize(container.RootfsPath()); err != nil { |
| sizeRootfs = -1 |
| } |
| } |
| return sizeRw, sizeRootfs |
| } |
| |
| func (container *Container) Copy(resource string) (archive.Archive, error) { |
| if err := container.EnsureMounted(); err != nil { |
| return nil, err |
| } |
| var filter []string |
| basePath := path.Join(container.RootfsPath(), resource) |
| stat, err := os.Stat(basePath) |
| if err != nil { |
| return nil, err |
| } |
| if !stat.IsDir() { |
| d, f := path.Split(basePath) |
| basePath = d |
| filter = []string{f} |
| } else { |
| filter = []string{path.Base(basePath)} |
| basePath = path.Dir(basePath) |
| } |
| return archive.TarFilter(basePath, &archive.TarOptions{ |
| Compression: archive.Uncompressed, |
| Includes: filter, |
| Recursive: true, |
| }) |
| } |
| |
| // Returns true if the container exposes a certain port |
| func (container *Container) Exposes(p Port) bool { |
| _, exists := container.Config.ExposedPorts[p] |
| return exists |
| } |
| |
| func (container *Container) GetPtyMaster() (*os.File, error) { |
| if container.ptyMaster == nil { |
| return nil, ErrNoTTY |
| } |
| if pty, ok := container.ptyMaster.(*os.File); ok { |
| return pty, nil |
| } |
| return nil, ErrNotATTY |
| } |