Exemplo n.º 1
0
func (ctr *container) start(checkpoint string, checkpointDir string) error {
	spec, err := ctr.spec()
	if err != nil {
		return nil
	}
	createChan := make(chan struct{})
	iopipe, err := ctr.openFifos(spec.Process.Terminal)
	if err != nil {
		return err
	}

	// we need to delay stdin closure after container start or else "stdin close"
	// event will be rejected by containerd.
	// stdin closure happens in AttachStreams
	stdin := iopipe.Stdin
	iopipe.Stdin = ioutils.NewWriteCloserWrapper(stdin, func() error {
		go func() {
			<-createChan
			stdin.Close()
		}()
		return nil
	})

	r := &containerd.CreateContainerRequest{
		Id:            ctr.containerID,
		BundlePath:    ctr.dir,
		Stdin:         ctr.fifo(syscall.Stdin),
		Stdout:        ctr.fifo(syscall.Stdout),
		Stderr:        ctr.fifo(syscall.Stderr),
		Checkpoint:    checkpoint,
		CheckpointDir: checkpointDir,
		// check to see if we are running in ramdisk to disable pivot root
		NoPivotRoot: os.Getenv("DOCKER_RAMDISK") != "",
		Runtime:     ctr.runtime,
		RuntimeArgs: ctr.runtimeArgs,
	}
	ctr.client.appendContainer(ctr)

	if err := ctr.client.backend.AttachStreams(ctr.containerID, *iopipe); err != nil {
		close(createChan)
		ctr.closeFifos(iopipe)
		return err
	}

	resp, err := ctr.client.remote.apiClient.CreateContainer(context.Background(), r)
	if err != nil {
		close(createChan)
		ctr.closeFifos(iopipe)
		return err
	}
	ctr.startedAt = time.Now()
	ctr.systemPid = systemPid(resp.Container)
	close(createChan)

	return ctr.client.backend.StateChanged(ctr.containerID, StateInfo{
		CommonStateInfo: CommonStateInfo{
			State: StateStart,
			Pid:   ctr.systemPid,
		}})
}
Exemplo n.º 2
0
func (bufPool *BufioWriterPool) NewWriteCloserWrapper(buf *bufio.Writer, w io.Writer) io.WriteCloser {
	return ioutils.NewWriteCloserWrapper(w, func() error {
		buf.Flush()
		if writeCloser, ok := w.(io.WriteCloser); ok {
			return writeCloser.Close()
		}
		return nil
	})
}
Exemplo n.º 3
0
func (fm *fileMetadataTransaction) TarSplitWriter() (io.WriteCloser, error) {
	f, err := os.OpenFile(filepath.Join(fm.root, "tar-split.json.gz"), os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return nil, err
	}

	fz := gzip.NewWriter(f)

	return ioutils.NewWriteCloserWrapper(fz, func() error {
		fz.Close()
		return f.Close()
	}), nil
}
Exemplo n.º 4
0
func createStdInCloser(pipe io.WriteCloser, process hcsshim.Process) io.WriteCloser {
	return ioutils.NewWriteCloserWrapper(pipe, func() error {
		if err := pipe.Close(); err != nil {
			return err
		}

		err := process.CloseStdin()
		if err != nil && !hcsshim.IsNotExist(err) && !hcsshim.IsAlreadyClosed(err) {
			// This error will occur if the compute system is currently shutting down
			if perr, ok := err.(*hcsshim.ProcessError); ok && perr.Err != hcsshim.ErrVmcomputeOperationInvalidState {
				return err
			}
		}

		return nil
	})
}
Exemplo n.º 5
0
func (fm *fileMetadataTransaction) TarSplitWriter(compressInput bool) (io.WriteCloser, error) {
	f, err := fm.ws.FileWriter("tar-split.json.gz", os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return nil, err
	}
	var wc io.WriteCloser
	if compressInput {
		wc = gzip.NewWriter(f)
	} else {
		wc = f
	}

	return ioutils.NewWriteCloserWrapper(wc, func() error {
		wc.Close()
		return f.Close()
	}), nil
}
Exemplo n.º 6
0
func createStdInCloser(pipe io.WriteCloser, process hcsshim.Process) io.WriteCloser {
	return ioutils.NewWriteCloserWrapper(pipe, func() error {
		if err := pipe.Close(); err != nil {
			return err
		}

		// We do not need to lock container ID here, even though
		// we are calling into hcsshim. This is safe, because the
		// only place that closes this process handle is this method.
		err := process.CloseStdin()
		if err != nil && !hcsshim.IsNotExist(err) {
			// This error will occur if the compute system is currently shutting down
			if perr, ok := err.(*hcsshim.ProcessError); ok && perr.Err != hcsshim.ErrVmcomputeOperationInvalidState {
				return err
			}
		}

		return err
	})
}
Exemplo n.º 7
0
func (p *process) openFifos(terminal bool) (*IOPipe, error) {
	bundleDir := p.dir
	if err := os.MkdirAll(bundleDir, 0700); err != nil {
		return nil, err
	}

	for i := 0; i < 3; i++ {
		f := p.fifo(i)
		if err := syscall.Mkfifo(f, 0700); err != nil && !os.IsExist(err) {
			return nil, fmt.Errorf("mkfifo: %s %v", f, err)
		}
	}

	io := &IOPipe{}
	stdinf, err := os.OpenFile(p.fifo(syscall.Stdin), syscall.O_RDWR, 0)
	if err != nil {
		return nil, err
	}

	io.Stdout = openReaderFromFifo(p.fifo(syscall.Stdout))
	if !terminal {
		io.Stderr = openReaderFromFifo(p.fifo(syscall.Stderr))
	} else {
		io.Stderr = emptyReader{}
	}

	io.Stdin = ioutils.NewWriteCloserWrapper(stdinf, func() error {
		stdinf.Close()
		_, err := p.client.remote.apiClient.UpdateProcess(context.Background(), &containerd.UpdateProcessRequest{
			Id:         p.containerID,
			Pid:        p.friendlyName,
			CloseStdin: true,
		})
		return err
	})

	return io, nil
}
Exemplo n.º 8
0
func targetStream(in io.Writer) (io.WriteCloser, <-chan []target) {
	r, w := io.Pipe()
	out := io.MultiWriter(in, w)
	targetChan := make(chan []target)

	go func() {
		targets := []target{}
		scanner := bufio.NewScanner(r)
		scanner.Split(ansiescape.ScanANSILines)
		for scanner.Scan() {
			line := scanner.Bytes()
			if matches := targetRegexp.FindSubmatch(line); len(matches) == 4 {
				dgst, err := digest.ParseDigest(string(matches[2]))
				if err != nil {
					// Line does match what is expected, continue looking for valid lines
					logrus.Debugf("Bad digest value %q in matched line, ignoring\n", string(matches[2]))
					continue
				}
				s, err := strconv.ParseInt(string(matches[3]), 10, 64)
				if err != nil {
					// Line does match what is expected, continue looking for valid lines
					logrus.Debugf("Bad size value %q in matched line, ignoring\n", string(matches[3]))
					continue
				}

				targets = append(targets, target{
					reference: registry.ParseReference(string(matches[1])),
					digest:    dgst,
					size:      s,
				})
			}
		}
		targetChan <- targets
	}()

	return ioutils.NewWriteCloserWrapper(out, w.Close), targetChan
}
Exemplo n.º 9
0
// AddProcess is the handler for adding a process to an already running
// container. It's called through docker exec. It returns the system pid of the
// exec'd process.
func (clnt *client) AddProcess(ctx context.Context, containerID, processFriendlyName string, specp Process, attachStdio StdioCallback) (int, error) {
	clnt.lock(containerID)
	defer clnt.unlock(containerID)
	container, err := clnt.getContainer(containerID)
	if err != nil {
		return -1, err
	}

	spec, err := container.spec()
	if err != nil {
		return -1, err
	}
	sp := spec.Process
	sp.Args = specp.Args
	sp.Terminal = specp.Terminal
	if len(specp.Env) > 0 {
		sp.Env = specp.Env
	}
	if specp.Cwd != nil {
		sp.Cwd = *specp.Cwd
	}
	if specp.User != nil {
		sp.User = specs.User{
			UID:            specp.User.UID,
			GID:            specp.User.GID,
			AdditionalGids: specp.User.AdditionalGids,
		}
	}
	if specp.Capabilities != nil {
		sp.Capabilities = specp.Capabilities
	}

	p := container.newProcess(processFriendlyName)

	r := &containerd.AddProcessRequest{
		Args:     sp.Args,
		Cwd:      sp.Cwd,
		Terminal: sp.Terminal,
		Id:       containerID,
		Env:      sp.Env,
		User: &containerd.User{
			Uid:            sp.User.UID,
			Gid:            sp.User.GID,
			AdditionalGids: sp.User.AdditionalGids,
		},
		Pid:             processFriendlyName,
		Stdin:           p.fifo(syscall.Stdin),
		Stdout:          p.fifo(syscall.Stdout),
		Stderr:          p.fifo(syscall.Stderr),
		Capabilities:    sp.Capabilities,
		ApparmorProfile: sp.ApparmorProfile,
		SelinuxLabel:    sp.SelinuxLabel,
		NoNewPrivileges: sp.NoNewPrivileges,
		Rlimits:         convertRlimits(sp.Rlimits),
	}

	iopipe, err := p.openFifos(sp.Terminal)
	if err != nil {
		return -1, err
	}

	resp, err := clnt.remote.apiClient.AddProcess(ctx, r)
	if err != nil {
		p.closeFifos(iopipe)
		return -1, err
	}

	var stdinOnce sync.Once
	stdin := iopipe.Stdin
	iopipe.Stdin = ioutils.NewWriteCloserWrapper(stdin, func() error {
		var err error
		stdinOnce.Do(func() { // on error from attach we don't know if stdin was already closed
			err = stdin.Close()
			if err2 := p.sendCloseStdin(); err == nil {
				err = err2
			}
		})
		return err
	})

	container.processes[processFriendlyName] = p

	if err := attachStdio(*iopipe); err != nil {
		p.closeFifos(iopipe)
		return -1, err
	}

	return int(resp.SystemPid), nil
}
Exemplo n.º 10
0
func (clnt *client) restore(cont *containerd.Container, lastEvent *containerd.Event, attachStdio StdioCallback, options ...CreateOption) (err error) {
	clnt.lock(cont.Id)
	defer clnt.unlock(cont.Id)

	logrus.Debugf("libcontainerd: restore container %s state %s", cont.Id, cont.Status)

	containerID := cont.Id
	if _, err := clnt.getContainer(containerID); err == nil {
		return fmt.Errorf("container %s is already active", containerID)
	}

	defer func() {
		if err != nil {
			clnt.deleteContainer(cont.Id)
		}
	}()

	container := clnt.newContainer(cont.BundlePath, options...)
	container.systemPid = systemPid(cont)

	var terminal bool
	for _, p := range cont.Processes {
		if p.Pid == InitFriendlyName {
			terminal = p.Terminal
		}
	}

	iopipe, err := container.openFifos(terminal)
	if err != nil {
		return err
	}
	var stdinOnce sync.Once
	stdin := iopipe.Stdin
	iopipe.Stdin = ioutils.NewWriteCloserWrapper(stdin, func() error {
		var err error
		stdinOnce.Do(func() { // on error from attach we don't know if stdin was already closed
			err = stdin.Close()
		})
		return err
	})

	if err := attachStdio(*iopipe); err != nil {
		container.closeFifos(iopipe)
		return err
	}

	clnt.appendContainer(container)

	err = clnt.backend.StateChanged(containerID, StateInfo{
		CommonStateInfo: CommonStateInfo{
			State: StateRestore,
			Pid:   container.systemPid,
		}})

	if err != nil {
		container.closeFifos(iopipe)
		return err
	}

	if lastEvent != nil {
		// This should only be a pause or resume event
		if lastEvent.Type == StatePause || lastEvent.Type == StateResume {
			return clnt.backend.StateChanged(containerID, StateInfo{
				CommonStateInfo: CommonStateInfo{
					State: lastEvent.Type,
					Pid:   container.systemPid,
				}})
		}

		logrus.Warnf("libcontainerd: unexpected backlog event: %#v", lastEvent)
	}

	return nil
}
Exemplo n.º 11
0
func (ctr *container) start(checkpoint string, checkpointDir string, attachStdio StdioCallback) error {
	spec, err := ctr.spec()
	if err != nil {
		return nil
	}

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	ready := make(chan struct{})

	iopipe, err := ctr.openFifos(spec.Process.Terminal)
	if err != nil {
		return err
	}

	var stdinOnce sync.Once

	// we need to delay stdin closure after container start or else "stdin close"
	// event will be rejected by containerd.
	// stdin closure happens in attachStdio
	stdin := iopipe.Stdin
	iopipe.Stdin = ioutils.NewWriteCloserWrapper(stdin, func() error {
		var err error
		stdinOnce.Do(func() { // on error from attach we don't know if stdin was already closed
			err = stdin.Close()
			go func() {
				select {
				case <-ready:
					if err := ctr.sendCloseStdin(); err != nil {
						logrus.Warnf("failed to close stdin: %+v", err)
					}
				case <-ctx.Done():
				}
			}()
		})
		return err
	})

	r := &containerd.CreateContainerRequest{
		Id:            ctr.containerID,
		BundlePath:    ctr.dir,
		Stdin:         ctr.fifo(syscall.Stdin),
		Stdout:        ctr.fifo(syscall.Stdout),
		Stderr:        ctr.fifo(syscall.Stderr),
		Checkpoint:    checkpoint,
		CheckpointDir: checkpointDir,
		// check to see if we are running in ramdisk to disable pivot root
		NoPivotRoot: os.Getenv("DOCKER_RAMDISK") != "",
		Runtime:     ctr.runtime,
		RuntimeArgs: ctr.runtimeArgs,
	}
	ctr.client.appendContainer(ctr)

	if err := attachStdio(*iopipe); err != nil {
		ctr.closeFifos(iopipe)
		return err
	}

	resp, err := ctr.client.remote.apiClient.CreateContainer(context.Background(), r)
	if err != nil {
		ctr.closeFifos(iopipe)
		return err
	}
	ctr.systemPid = systemPid(resp.Container)
	close(ready)

	return ctr.client.backend.StateChanged(ctr.containerID, StateInfo{
		CommonStateInfo: CommonStateInfo{
			State: StateStart,
			Pid:   ctr.systemPid,
		}})
}