package libcontainerd import ( "errors" "fmt" "io" "path/filepath" "strings" "syscall" "github.com/Microsoft/hcsshim" "github.com/Sirupsen/logrus" ) type client struct { clientCommon // Platform specific properties below here (none presently on Windows) } // Win32 error codes that are used for various workarounds // These really should be ALL_CAPS to match golangs syscall library and standard // Win32 error conventions, but golint insists on CamelCase. const ( CoEClassstring = syscall.Errno(0x800401F3) // Invalid class string ErrorNoNetwork = syscall.Errno(1222) // The network is not present or not started ErrorBadPathname = syscall.Errno(161) // The specified path is invalid ErrorInvalidObject = syscall.Errno(0x800710D8) // The object identifier does not represent a valid object ) // defaultOwner is a tag passed to HCS to allow it to differentiate between // container creator management stacks. We hard code "docker" in the case // of docker. const defaultOwner = "docker" // Create is the entrypoint to create a container from a spec, and if successfully // created, start it too. func (clnt *client) Create(containerID string, spec Spec, options ...CreateOption) error { logrus.Debugln("LCD client.Create() with spec", spec) configuration := &hcsshim.ContainerConfig{ SystemType: "Container", Name: containerID, Owner: defaultOwner, VolumePath: spec.Root.Path, IgnoreFlushesDuringBoot: spec.Windows.FirstStart, LayerFolderPath: spec.Windows.LayerFolder, HostName: spec.Hostname, } if spec.Windows.Networking != nil { configuration.EndpointList = spec.Windows.Networking.EndpointList } if spec.Windows.Resources != nil { if spec.Windows.Resources.CPU != nil { if spec.Windows.Resources.CPU.Shares != nil { configuration.ProcessorWeight = *spec.Windows.Resources.CPU.Shares } if spec.Windows.Resources.CPU.Percent != nil { configuration.ProcessorMaximum = *spec.Windows.Resources.CPU.Percent * 100 // ProcessorMaximum is a value between 1 and 10000 } } if spec.Windows.Resources.Memory != nil { if spec.Windows.Resources.Memory.Limit != nil { configuration.MemoryMaximumInMB = *spec.Windows.Resources.Memory.Limit / 1024 / 1024 } } if spec.Windows.Resources.Storage != nil { if spec.Windows.Resources.Storage.Bps != nil { configuration.StorageBandwidthMaximum = *spec.Windows.Resources.Storage.Bps } if spec.Windows.Resources.Storage.Iops != nil { configuration.StorageIOPSMaximum = *spec.Windows.Resources.Storage.Iops } if spec.Windows.Resources.Storage.SandboxSize != nil { configuration.StorageSandboxSize = *spec.Windows.Resources.Storage.SandboxSize } } } if spec.Windows.HvRuntime != nil { configuration.HvPartition = true configuration.HvRuntime = &hcsshim.HvRuntime{ ImagePath: spec.Windows.HvRuntime.ImagePath, } } if configuration.HvPartition { configuration.SandboxPath = filepath.Dir(spec.Windows.LayerFolder) } else { configuration.VolumePath = spec.Root.Path configuration.LayerFolderPath = spec.Windows.LayerFolder } for _, option := range options { if s, ok := option.(*ServicingOption); ok { configuration.Servicing = s.IsServicing break } } for _, layerPath := range spec.Windows.LayerPaths { _, filename := filepath.Split(layerPath) g, err := hcsshim.NameToGuid(filename) if err != nil { return err } configuration.Layers = append(configuration.Layers, hcsshim.Layer{ ID: g.ToString(), Path: layerPath, }) } // Add the mounts (volumes, bind mounts etc) to the structure mds := make([]hcsshim.MappedDir, len(spec.Mounts)) for i, mount := range spec.Mounts { mds[i] = hcsshim.MappedDir{ HostPath: mount.Source, ContainerPath: mount.Destination, ReadOnly: mount.Readonly} } configuration.MappedDirectories = mds hcsContainer, err := hcsshim.CreateContainer(containerID, configuration) if err != nil { return err } // Construct a container object for calling start on it. container := &container{ containerCommon: containerCommon{ process: process{ processCommon: processCommon{ containerID: containerID, client: clnt, friendlyName: InitFriendlyName, }, commandLine: strings.Join(spec.Process.Args, " "), }, processes: make(map[string]*process), }, ociSpec: spec, hcsContainer: hcsContainer, } container.options = options for _, option := range options { if err := option.Apply(container); err != nil { logrus.Error(err) } } // Call start, and if it fails, delete the container from our // internal structure, start will keep HCS in sync by deleting the // container there. logrus.Debugf("Create() id=%s, Calling start()", containerID) if err := container.start(); err != nil { clnt.deleteContainer(containerID) return err } logrus.Debugf("Create() id=%s completed successfully", containerID) return nil } // AddProcess is the handler for adding a process to an already running // container. It's called through docker exec. func (clnt *client) AddProcess(containerID, processFriendlyName string, procToAdd Process) error { clnt.lock(containerID) defer clnt.unlock(containerID) container, err := clnt.getContainer(containerID) if err != nil { return err } // Note we always tell HCS to // create stdout as it's required regardless of '-i' or '-t' options, so that // docker can always grab the output through logs. We also tell HCS to always // create stdin, even if it's not used - it will be closed shortly. Stderr // is only created if it we're not -t. createProcessParms := hcsshim.ProcessConfig{ EmulateConsole: procToAdd.Terminal, ConsoleSize: procToAdd.InitialConsoleSize, CreateStdInPipe: true, CreateStdOutPipe: true, CreateStdErrPipe: !procToAdd.Terminal, } // Take working directory from the process to add if it is defined, // otherwise take from the first process. if procToAdd.Cwd != "" { createProcessParms.WorkingDirectory = procToAdd.Cwd } else { createProcessParms.WorkingDirectory = container.ociSpec.Process.Cwd } // Configure the environment for the process createProcessParms.Environment = setupEnvironmentVariables(procToAdd.Env) createProcessParms.CommandLine = strings.Join(procToAdd.Args, " ") logrus.Debugf("commandLine: %s", createProcessParms.CommandLine) // Start the command running in the container. var stdout, stderr io.ReadCloser var stdin io.WriteCloser newProcess, err := container.hcsContainer.CreateProcess(&createProcessParms) if err != nil { logrus.Errorf("AddProcess %s CreateProcess() failed %s", containerID, err) return err } stdin, stdout, stderr, err = newProcess.Stdio() if err != nil { logrus.Errorf("%s getting std pipes failed %s", containerID, err) return err } iopipe := &IOPipe{Terminal: procToAdd.Terminal} iopipe.Stdin = createStdInCloser(stdin, newProcess) // TEMP: Work around Windows BS/DEL behavior. iopipe.Stdin = fixStdinBackspaceBehavior(iopipe.Stdin, container.ociSpec.Platform.OSVersion, procToAdd.Terminal) // Convert io.ReadClosers to io.Readers if stdout != nil { iopipe.Stdout = openReaderFromPipe(stdout) } if stderr != nil { iopipe.Stderr = openReaderFromPipe(stderr) } pid := newProcess.Pid() proc := &process{ processCommon: processCommon{ containerID: containerID, friendlyName: processFriendlyName, client: clnt, systemPid: uint32(pid), }, commandLine: createProcessParms.CommandLine, hcsProcess: newProcess, } // Add the process to the container's list of processes container.processes[processFriendlyName] = proc // Make sure the lock is not held while calling back into the daemon clnt.unlock(containerID) // Tell the engine to attach streams back to the client if err := clnt.backend.AttachStreams(processFriendlyName, *iopipe); err != nil { return err } // Lock again so that the defer unlock doesn't fail. (I really don't like this code) clnt.lock(containerID) // Spin up a go routine waiting for exit to handle cleanup go container.waitExit(proc, false) return nil } // Signal handles `docker stop` on Windows. While Linux has support for // the full range of signals, signals aren't really implemented on Windows. // We fake supporting regular stop and -9 to force kill. func (clnt *client) Signal(containerID string, sig int) error { var ( cont *container err error ) // Get the container as we need it to find the pid of the process. clnt.lock(containerID) defer clnt.unlock(containerID) if cont, err = clnt.getContainer(containerID); err != nil { return err } cont.manualStopRequested = true logrus.Debugf("lcd: Signal() containerID=%s sig=%d pid=%d", containerID, sig, cont.systemPid) if syscall.Signal(sig) == syscall.SIGKILL { // Terminate the compute system if err := cont.hcsContainer.Terminate(); err != nil { if err != hcsshim.ErrVmcomputeOperationPending { logrus.Errorf("Failed to terminate %s - %q", containerID, err) } } } else { // Terminate Process if err := cont.hcsProcess.Kill(); err != nil { // ignore errors logrus.Warnf("Failed to terminate pid %d in %s: %q", cont.systemPid, containerID, err) } } return nil } // While Linux has support for the full range of signals, signals aren't really implemented on Windows. // We try to terminate the specified process whatever signal is requested. func (clnt *client) SignalProcess(containerID string, processFriendlyName string, sig int) error { clnt.lock(containerID) defer clnt.unlock(containerID) cont, err := clnt.getContainer(containerID) if err != nil { return err } for _, p := range cont.processes { if p.friendlyName == processFriendlyName { return hcsshim.TerminateProcessInComputeSystem(containerID, p.systemPid) } } return fmt.Errorf("SignalProcess could not find process %s in %s", processFriendlyName, containerID) } // Resize handles a CLI event to resize an interactive docker run or docker exec // window. func (clnt *client) Resize(containerID, processFriendlyName string, width, height int) error { // Get the libcontainerd container object clnt.lock(containerID) defer clnt.unlock(containerID) cont, err := clnt.getContainer(containerID) if err != nil { return err } h, w := uint16(height), uint16(width) if processFriendlyName == InitFriendlyName { logrus.Debugln("Resizing systemPID in", containerID, cont.process.systemPid) return cont.process.hcsProcess.ResizeConsole(w, h) } for _, p := range cont.processes { if p.friendlyName == processFriendlyName { logrus.Debugln("Resizing exec'd process", containerID, p.systemPid) return p.hcsProcess.ResizeConsole(w, h) } } return fmt.Errorf("Resize could not find containerID %s to resize", containerID) } // Pause handles pause requests for containers func (clnt *client) Pause(containerID string) error { return errors.New("Windows: Containers cannot be paused") } // Resume handles resume requests for containers func (clnt *client) Resume(containerID string) error { return errors.New("Windows: Containers cannot be paused") } // Stats handles stats requests for containers func (clnt *client) Stats(containerID string) (*Stats, error) { return nil, errors.New("Windows: Stats not implemented") } // Restore is the handler for restoring a container func (clnt *client) Restore(containerID string, unusedOnWindows ...CreateOption) error { // TODO Windows: Implement this. For now, just tell the backend the container exited. logrus.Debugf("lcd Restore %s", containerID) return clnt.backend.StateChanged(containerID, StateInfo{ CommonStateInfo: CommonStateInfo{ State: StateExit, ExitCode: 1 << 31, }}) } // GetPidsForContainer returns a list of process IDs running in a container. // Although implemented, this is not used in Windows. func (clnt *client) GetPidsForContainer(containerID string) ([]int, error) { var pids []int clnt.lock(containerID) defer clnt.unlock(containerID) cont, err := clnt.getContainer(containerID) if err != nil { return nil, err } // Add the first process pids = append(pids, int(cont.containerCommon.systemPid)) // And add all the exec'd processes for _, p := range cont.processes { pids = append(pids, int(p.processCommon.systemPid)) } return pids, nil } // Summary returns a summary of the processes running in a container. // This is present in Windows to support docker top. In linux, the // engine shells out to ps to get process information. On Windows, as // the containers could be Hyper-V containers, they would not be // visible on the container host. However, libcontainerd does have // that information. func (clnt *client) Summary(containerID string) ([]Summary, error) { var s []Summary clnt.lock(containerID) defer clnt.unlock(containerID) cont, err := clnt.getContainer(containerID) if err != nil { return nil, err } // Add the first process s = append(s, Summary{ Pid: cont.containerCommon.systemPid, Command: cont.ociSpec.Process.Args[0]}) // And add all the exec'd processes for _, p := range cont.processes { s = append(s, Summary{ Pid: p.processCommon.systemPid, Command: p.commandLine}) } return s, nil } // UpdateResources updates resources for a running container. func (clnt *client) UpdateResources(containerID string, resources Resources) error { // Updating resource isn't supported on Windows // but we should return nil for enabling updating container return nil }