Golang utils.FollowSymlinkInScope函數代碼示例

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.Stat(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
		}

		if p, err := filepath.EvalSymlinks(srcPath); err != nil {
			return err
		} else {
			srcPath = p
		}

		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 {
//.........這裏部分代碼省略.........

//.........這裏部分代碼省略.........
		if err := os.MkdirAll(path.Join(root, container.Config.WorkingDir), 0755); err != nil {
			return nil
		}
	}

	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[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
}

func mountVolumesForContainer(container *Container, envPath string) error {
	// Setup the root fs as a bind mount of the base fs
	var (
		root    = container.RootfsPath()
		runtime = container.runtime
	)
	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, filepath.Join(root, "/.dockerinit"), "none", "bind,ro"); err != nil {
		return err
	}
	if err := mount.Mount(envPath, filepath.Join(root, "/.dockerenv"), "none", "bind,ro"); err != nil {
		return err
	}
	if err := mount.Mount(container.ResolvConfPath, filepath.Join(root, "/etc/resolv.conf"), "none", "bind,ro"); err != nil {
		return err
	}

	if container.HostnamePath != "" && container.HostsPath != "" {
		if err := mount.Mount(container.HostnamePath, filepath.Join(root, "/etc/hostname"), "none", "bind,ro"); err != nil {
			return err
		}
		if err := mount.Mount(container.HostsPath, filepath.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 = filepath.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
		}
	}
	return nil
}

func (b *buildFile) addContext(container *runtime.Container, orig, dest string, remote bool) error {
	var (
		err      error
		origPath = path.Join(b.contextPath, orig)
		destPath = path.Join(container.RootfsPath(), dest)
	)

	if destPath != container.RootfsPath() {
		destPath, err = utils.FollowSymlinkInScope(destPath, container.RootfsPath())
		if err != nil {
			return err
		}
	}

	// Preserve the trailing '/'
	if strings.HasSuffix(dest, "/") {
		destPath = destPath + "/"
	}
	fi, err := os.Stat(origPath)
	if err != nil {
		if os.IsNotExist(err) {
			return fmt.Errorf("%s: no such file or directory", orig)
		}
		return err
	}

	chownR := func(destPath string, uid, gid int) error {
		return filepath.Walk(destPath, func(path string, info os.FileInfo, err error) error {
			if err := os.Lchown(path, uid, gid); err != nil {
				return err
			}
			return nil
		})
	}

	if fi.IsDir() {
		if err := archive.CopyWithTar(origPath, destPath); err != nil {
			return err
		}
		if err := chownR(destPath, 0, 0); err != nil {
			return err
		}
		return nil
	}

	// First try to unpack the source as an archive
	// to support the untar feature we need to clean up the path a little bit
	// because tar is very forgiving.  First we need to strip off the archive's
	// filename from the path but this is only added if it does not end in / .
	tarDest := destPath
	if strings.HasSuffix(tarDest, "/") {
		tarDest = filepath.Dir(destPath)
	}

	// If we are adding a remote file, do not try to untar it
	if !remote {
		// try to successfully untar the orig
		if err := archive.UntarPath(origPath, tarDest); err == nil {
			return nil
		}
		utils.Debugf("Couldn't untar %s to %s: %s", origPath, destPath, err)
	}

	// If that fails, just copy it as a regular file
	// but do not use all the magic path handling for the tar path
	if err := os.MkdirAll(path.Dir(destPath), 0755); err != nil {
		return err
	}
	if err := archive.CopyWithTar(origPath, destPath); err != nil {
		return err
	}

	if err := chownR(destPath, 0, 0); err != nil {
		return err
	}
	return nil
}

func createVolumes(container *Container) error {
	binds, err := getBindMap(container)
	if err != nil {
		return err
	}

	volumesDriver := container.daemon.volumes.Driver()
	// Create the requested volumes if they don't exist
	for volPath := range container.Config.Volumes {
		volPath = filepath.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 !filepath.IsAbs(srcPath) {
				return fmt.Errorf("%s must be an absolute path", srcPath)
			}
			if strings.ToLower(bindMap.Mode) == "rw" {
				srcRW = true
			}
			if stat, err := os.Stat(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.daemon.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
		}

		if p, err := filepath.EvalSymlinks(srcPath); err != nil {
			return err
		} else {
			srcPath = p
		}

		// Create the mountpoint
		rootVolPath, err := utils.FollowSymlinkInScope(filepath.Join(container.basefs, volPath), container.basefs)
		if err != nil {
			return err
		}

		newVolPath, err := filepath.Rel(container.basefs, rootVolPath)
		if err != nil {
			return err
		}
		newVolPath = "/" + newVolPath

		if volPath != newVolPath {
			delete(container.Volumes, volPath)
			delete(container.VolumesRW, volPath)
		}

		container.Volumes[newVolPath] = srcPath
		container.VolumesRW[newVolPath] = srcRW

		if err := createIfNotExists(rootVolPath, volIsDir); err != nil {
			return err
		}

		// 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
//.........這裏部分代碼省略.........