예제 #1
0
파일: archive.go 프로젝트: Nerdness/docker
// CopyFileWithTar emulates the behavior of the 'cp' command-line
// for a single file. It copies a regular file from path `src` to
// path `dst`, and preserves all its metadata.
//
// If `dst` ends with a trailing slash '/', the final destination path
// will be `dst/base(src)`.
func CopyFileWithTar(src, dst string) (err error) {
	utils.Debugf("CopyFileWithTar(%s, %s)", src, dst)
	srcSt, err := os.Stat(src)
	if err != nil {
		return err
	}
	if srcSt.IsDir() {
		return fmt.Errorf("Can't copy a directory")
	}
	// Clean up the trailing /
	if dst[len(dst)-1] == '/' {
		dst = path.Join(dst, filepath.Base(src))
	}
	// Create the holding directory if necessary
	if err := os.MkdirAll(filepath.Dir(dst), 0700); err != nil && !os.IsExist(err) {
		return err
	}

	r, w := io.Pipe()
	errC := utils.Go(func() error {
		defer w.Close()

		srcF, err := os.Open(src)
		if err != nil {
			return err
		}
		defer srcF.Close()

		tw := tar.NewWriter(w)
		hdr, err := tar.FileInfoHeader(srcSt, "")
		if err != nil {
			return err
		}
		hdr.Name = filepath.Base(dst)
		if err := tw.WriteHeader(hdr); err != nil {
			return err
		}
		if _, err := io.Copy(tw, srcF); err != nil {
			return err
		}
		tw.Close()
		return nil
	})
	defer func() {
		if er := <-errC; err != nil {
			err = er
		}
	}()
	return Untar(r, filepath.Dir(dst), nil)
}
예제 #2
0
func (b *buildFile) run() (string, error) {
	if b.image == "" {
		return "", fmt.Errorf("Please provide a source image with `from` prior to run")
	}
	b.config.Image = b.image

	// Create the container and start it
	c, _, err := b.runtime.Create(b.config, "")
	if err != nil {
		return "", err
	}
	b.tmpContainers[c.ID] = struct{}{}
	fmt.Fprintf(b.outStream, " ---> Running in %s\n", utils.TruncateID(c.ID))

	// override the entry point that may have been picked up from the base image
	c.Path = b.config.Cmd[0]
	c.Args = b.config.Cmd[1:]

	var errCh chan error

	if b.verbose {
		errCh = utils.Go(func() error {
			return <-c.Attach(nil, nil, b.outStream, b.errStream)
		})
	}

	//start the container
	if err := c.Start(); err != nil {
		return "", err
	}

	if errCh != nil {
		if err := <-errCh; err != nil {
			return "", err
		}
	}

	// Wait for it to finish
	if ret := c.Wait(); ret != 0 {
		err := &utils.JSONError{
			Message: fmt.Sprintf("The command %v returned a non-zero code: %d", b.config.Cmd, ret),
			Code:    ret,
		}
		return "", err
	}

	return c.ID, nil
}
예제 #3
0
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.Mount(); err != nil {
		return err
	}

	if container.runtime.config.DisableNetwork {
		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.sysInfo.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.sysInfo.SwapLimit {
		log.Printf("WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.\n")
		container.Config.MemorySwap = -1
	}

	if container.runtime.sysInfo.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
	}

	// 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")
	}

	// 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.eng)
			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 != "" {
		container.Config.WorkingDir = path.Clean(container.Config.WorkingDir)
		if err := os.MkdirAll(path.Join(container.basefs, container.Config.WorkingDir), 0755); err != nil {
			return nil
		}
	}

	envPath, err := container.EnvConfigPath()
	if err != nil {
		return err
	}

	// Setup the root fs as a bind mount of the base fs
	root := container.RootfsPath()
	if err := os.MkdirAll(root, 0755); err != nil && !os.IsExist(err) {
		return nil
	}

	// Create a bind mount of the base fs as a place where we can add mounts
	// without affecting the ability to access the base fs
	if err := mount.Mount(container.basefs, root, "none", "bind,rw"); err != nil {
		return err
	}

	// Make sure the root fs is private so the mounts here don't propagate to basefs
	if err := mount.ForceMount(root, root, "none", "private"); 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[r] {
			mountAs = "rw"
		}

		r = path.Join(root, r)
		if p, err := utils.FollowSymlinkInScope(r, root); err != nil {
			return err
		} else {
			r = p
		}

		if err := mount.Mount(v, r, "none", fmt.Sprintf("bind,%s", mountAs)); err != nil {
			return err
		}
	}

	populateCommand(container)

	// 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.waitLock = make(chan struct{})

	// Setuping pipes and/or Pty
	var setup func() error
	if container.Config.Tty {
		setup = container.setupPty
	} else {
		setup = container.setupStd
	}
	if err := setup(); err != nil {
		return err
	}

	callbackLock := make(chan struct{})
	callback := func(command *execdriver.Command) {
		container.State.SetRunning(command.Pid())
		if command.Tty {
			// The callback is called after the process Start()
			// so we are in the parent process. In TTY mode, stdin/out/err is the PtySlace
			// which we close here.
			if c, ok := command.Stdout.(io.Closer); ok {
				c.Close()
			}
		}
		if err := container.ToDisk(); err != nil {
			utils.Debugf("%s", err)
		}
		close(callbackLock)
	}

	// We use a callback here instead of a goroutine and an chan for
	// syncronization purposes
	cErr := utils.Go(func() error { return container.monitor(callback) })

	// Start should not return until the process is actually running
	select {
	case <-callbackLock:
	case err := <-cErr:
		return err
	}
	return nil
}
예제 #4
0
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 {
					defer func() {
						if cStdout != nil {
							cStdout.Close()
						}
						if cStderr != nil {
							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 {
		defer func() {
			if cStdout != nil {
				cStdout.Close()
			}
			if cStderr != nil {
				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
	})
}