Golang fileutils.Matches函数代码示例

// Reads a Dockerfile from the current context. It assumes that the
// 'filename' is a relative path from the root of the context
func (b *Builder) readDockerfile(origFile string) error {
	filename, err := symlink.FollowSymlinkInScope(filepath.Join(b.contextPath, origFile), b.contextPath)
	if err != nil {
		return fmt.Errorf("The Dockerfile (%s) must be within the build context", origFile)
	}

	fi, err := os.Lstat(filename)
	if os.IsNotExist(err) {
		return fmt.Errorf("Cannot locate specified Dockerfile: %s", origFile)
	}
	if fi.Size() == 0 {
		return ErrDockerfileEmpty
	}

	f, err := os.Open(filename)
	if err != nil {
		return err
	}

	b.dockerfile, err = parser.Parse(f)
	f.Close()

	if err != nil {
		return err
	}

	// After the Dockerfile has been parsed, we need to check the .dockerignore
	// file for either "Dockerfile" or ".dockerignore", and if either are
	// present then erase them from the build context. These files should never
	// have been sent from the client but we did send them to make sure that
	// we had the Dockerfile to actually parse, and then we also need the
	// .dockerignore file to know whether either file should be removed.
	// Note that this assumes the Dockerfile has been read into memory and
	// is now safe to be removed.

	excludes, _ := utils.ReadDockerIgnore(filepath.Join(b.contextPath, ".dockerignore"))
	if rm, _ := fileutils.Matches(".dockerignore", excludes); rm == true {
		os.Remove(filepath.Join(b.contextPath, ".dockerignore"))
		b.context.(tarsum.BuilderContext).Remove(".dockerignore")
	}
	if rm, _ := fileutils.Matches(b.dockerfileName, excludes); rm == true {
		os.Remove(filepath.Join(b.contextPath, b.dockerfileName))
		b.context.(tarsum.BuilderContext).Remove(b.dockerfileName)
	}

	return nil
}

// getArchive returns the tarfile io.ReadCloser. It is a direct copy of the
// logic found in the official docker client.
// See <https://github.com/docker/docker/blob/78f2b8d8/api/client/build.go#L126-L172>.
func getArchive(contextDir, relDockerfile string) (io.ReadCloser, error) {
	var err error

	// And canonicalize dockerfile name to a platform-independent one
	relDockerfile, err = archive.CanonicalTarNameForPath(relDockerfile)
	if err != nil {
		return nil, fmt.Errorf("cannot canonicalize dockerfile path %s: %v", relDockerfile, err)
	}

	f, err := os.Open(filepath.Join(contextDir, ".dockerignore"))
	if err != nil && !os.IsNotExist(err) {
		return nil, err
	}

	var excludes []string
	if err == nil {
		excludes, err = dockerignore.ReadAll(f)
		if err != nil {
			return nil, err
		}
	}

	// If .dockerignore mentions .dockerignore or the Dockerfile
	// then make sure we send both files over to the daemon
	// because Dockerfile is, obviously, needed no matter what, and
	// .dockerignore is needed to know if either one needs to be
	// removed. The daemon will remove them for us, if needed, after it
	// parses the Dockerfile. Ignore errors here, as they will have been
	// caught by validateContextDirectory above.
	var includes = []string{"."}
	keepThem1, _ := fileutils.Matches(".dockerignore", excludes)
	keepThem2, _ := fileutils.Matches(relDockerfile, excludes)
	if keepThem1 || keepThem2 {
		includes = append(includes, ".dockerignore", relDockerfile)
	}

	return archive.TarWithOptions(contextDir, &archive.TarOptions{
		Compression:     archive.Uncompressed,
		ExcludePatterns: excludes,
		IncludeFiles:    includes,
	})
}

func checkLargeFiles() error {
	title := "Large files in <file>.dockerignore</file>"
	startCheck(title)

	files := map[string]int64{}
	message := ""

	di, _ := readDockerIgnore(".")

	f := func(path string, info os.FileInfo, err error) error {
		m, err := fileutils.Matches(path, di)
		if err != nil {
			return err
		}
		if m {
			return nil
		}
		if info.Size() >= 200000000 {
			files[path] = info.Size()
		}
		return nil
	}

	err := filepath.Walk(".", f)
	if err != nil {
		return err
	}

	if len(files) == 0 {
		diagnose(Diagnosis{
			Title: title,
			Kind:  "success",
		})
		return nil
	}

	for k, v := range files {
		message += fmt.Sprintf(
			"<warning>./%s is %d bytes, perhaps you should add it to your .dockerignore to speed up builds and deploys</warning>\n",
			k,
			v,
		)
	}

	diagnose(Diagnosis{
		Title:       title,
		Kind:        "warning",
		DocsLink:    "https://docs.docker.com/engine/reference/builder/#/dockerignore-file",
		Description: message,
	})
	return nil
}

func send(ch chan Change, op, file, base string, ignore []string) {
	rel, err := filepath.Rel(base, file)
	if err != nil {
		return
	}

	if match, _ := fileutils.Matches(rel, ignore); match {
		return
	}

	change := Change{
		Operation: op,
		Base:      base,
		Path:      rel,
	}

	ch <- change
}

// validateContextDirectory checks if all the contents of the directory
// can be read and returns an error if some files can't be read
// symlinks which point to non-existing files don't trigger an error
func validateContextDirectory(srcPath string, excludes []string) error {
	contextRoot, err := getContextRoot(srcPath)
	if err != nil {
		return err
	}
	return filepath.Walk(contextRoot, func(filePath string, f os.FileInfo, err error) error {
		// skip this directory/file if it's not in the path, it won't get added to the context
		if relFilePath, err := filepath.Rel(contextRoot, filePath); err != nil {
			return err
		} else if skip, err := fileutils.Matches(relFilePath, excludes); err != nil {
			return err
		} else if skip {
			if f.IsDir() {
				return filepath.SkipDir
			}
			return nil
		}

		if err != nil {
			if os.IsPermission(err) {
				return fmt.Errorf("can't stat '%s'", filePath)
			}
			if os.IsNotExist(err) {
				return nil
			}
			return err
		}

		// skip checking if symlinks point to non-existing files, such symlinks can be useful
		// also skip named pipes, because they hanging on open
		if f.Mode()&(os.ModeSymlink|os.ModeNamedPipe) != 0 {
			return nil
		}

		if !f.IsDir() {
			currentFile, err := os.Open(filePath)
			if err != nil && os.IsPermission(err) {
				return fmt.Errorf("no permission to read from '%s'", filePath)
			}
			currentFile.Close()
		}
		return nil
	})
}

func createTarStream(srcPath, dockerfilePath string) (io.ReadCloser, error) {
	excludes, err := parseDockerignore(srcPath)
	if err != nil {
		return nil, err
	}

	includes := []string{"."}

	// If .dockerignore mentions .dockerignore or the Dockerfile
	// then make sure we send both files over to the daemon
	// because Dockerfile is, obviously, needed no matter what, and
	// .dockerignore is needed to know if either one needs to be
	// removed.  The deamon will remove them for us, if needed, after it
	// parses the Dockerfile.
	//
	// https://github.com/docker/docker/issues/8330
	//
	forceIncludeFiles := []string{".dockerignore", dockerfilePath}

	for _, includeFile := range forceIncludeFiles {
		if includeFile == "" {
			continue
		}
		keepThem, err := fileutils.Matches(includeFile, excludes)
		if err != nil {
			return nil, fmt.Errorf("cannot match .dockerfile: '%s', error: %s", includeFile, err)
		}
		if keepThem {
			includes = append(includes, includeFile)
		}
	}

	if err := validateContextDirectory(srcPath, excludes); err != nil {
		return nil, err
	}
	tarOpts := &archive.TarOptions{
		ExcludePatterns: excludes,
		IncludeFiles:    includes,
		Compression:     archive.Uncompressed,
		NoLchown:        true,
	}
	return archive.TarWithOptions(srcPath, tarOpts)
}

// Process reads the .dockerignore file at the root of the embedded context.
// If .dockerignore does not exist in the context, then nil is returned.
//
// It can take a list of files to be removed after .dockerignore is removed.
// This is used for server-side implementations of builders that need to send
// the .dockerignore file as well as the special files specified in filesToRemove,
// but expect them to be excluded from the context after they were processed.
//
// For example, server-side Dockerfile builders are expected to pass in the name
// of the Dockerfile to be removed after it was parsed.
//
// TODO: Don't require a ModifiableContext (use Context instead) and don't remove
// files, instead handle a list of files to be excluded from the context.
func (c DockerIgnoreContext) Process(filesToRemove []string) error {
	dockerignore, err := c.Open(".dockerignore")
	// Note that a missing .dockerignore file isn't treated as an error
	if err != nil {
		if os.IsNotExist(err) {
			return nil
		}
		return err
	}
	excludes, _ := utils.ReadDockerIgnore(dockerignore)
	filesToRemove = append([]string{".dockerignore"}, filesToRemove...)
	for _, fileToRemove := range filesToRemove {
		rm, _ := fileutils.Matches(fileToRemove, excludes)
		if rm {
			c.Remove(fileToRemove)
		}
	}
	return nil
}

func indexWalker(root string, index client.Index, ignore []string) filepath.WalkFunc {
	return func(path string, info os.FileInfo, err error) error {
		rel, err := filepath.Rel(root, path)

		if err != nil {
			return err
		}

		if info.IsDir() {
			return nil
		}

		match, err := fileutils.Matches(rel, ignore)

		if err != nil {
			return err
		}

		if match {
			return nil
		}

		data, err := ioutil.ReadFile(path)

		if err != nil {
			return err
		}

		sum := sha256.Sum256(data)
		hash := hex.EncodeToString([]byte(sum[:]))

		index[hash] = client.IndexItem{
			Name:    rel,
			Mode:    info.Mode(),
			ModTime: info.ModTime(),
			Size:    len(data),
		}

		return nil
	}
}

// TarWithOptions creates an archive from the directory at `path`, only including files whose relative
// paths are included in `options.IncludeFiles` (if non-nil) or not in `options.ExcludePatterns`.
func TarWithOptions(srcPath string, options *TarOptions) (io.ReadCloser, error) {
	pipeReader, pipeWriter := io.Pipe()

	compressWriter, err := CompressStream(pipeWriter, options.Compression)
	if err != nil {
		return nil, err
	}

	go func() {
		ta := &tarAppender{
			TarWriter: tar.NewWriter(compressWriter),
			Buffer:    pools.BufioWriter32KPool.Get(nil),
			SeenFiles: make(map[uint64]string),
		}
		// this buffer is needed for the duration of this piped stream
		defer pools.BufioWriter32KPool.Put(ta.Buffer)

		// In general we log errors here but ignore them because
		// during e.g. a diff operation the container can continue
		// mutating the filesystem and we can see transient errors
		// from this

		if options.IncludeFiles == nil {
			options.IncludeFiles = []string{"."}
		}

		seen := make(map[string]bool)

		var renamedRelFilePath string // For when tar.Options.Name is set
		for _, include := range options.IncludeFiles {
			filepath.Walk(filepath.Join(srcPath, include), func(filePath string, f os.FileInfo, err error) error {
				if err != nil {
					logrus.Debugf("Tar: Can't stat file %s to tar: %s", srcPath, err)
					return nil
				}

				relFilePath, err := filepath.Rel(srcPath, filePath)
				if err != nil || (relFilePath == "." && f.IsDir()) {
					// Error getting relative path OR we are looking
					// at the root path. Skip in both situations.
					return nil
				}

				skip := false

				// If "include" is an exact match for the current file
				// then even if there's an "excludePatterns" pattern that
				// matches it, don't skip it. IOW, assume an explicit 'include'
				// is asking for that file no matter what - which is true
				// for some files, like .dockerignore and Dockerfile (sometimes)
				if include != relFilePath {
					skip, err = fileutils.Matches(relFilePath, options.ExcludePatterns)
					if err != nil {
						logrus.Debugf("Error matching %s", relFilePath, err)
						return err
					}
				}

				if skip {
					if f.IsDir() {
						return filepath.SkipDir
					}
					return nil
				}

				if seen[relFilePath] {
					return nil
				}
				seen[relFilePath] = true

				// Rename the base resource
				if options.Name != "" && filePath == srcPath+"/"+filepath.Base(relFilePath) {
					renamedRelFilePath = relFilePath
				}
				// Set this to make sure the items underneath also get renamed
				if options.Name != "" {
					relFilePath = strings.Replace(relFilePath, renamedRelFilePath, options.Name, 1)
				}

				if err := ta.addTarFile(filePath, relFilePath); err != nil {
					logrus.Debugf("Can't add file %s to tar: %s", filePath, err)
				}
				return nil
			})
		}

		// Make sure to check the error on Close.
		if err := ta.TarWriter.Close(); err != nil {
			logrus.Debugf("Can't close tar writer: %s", err)
		}
		if err := compressWriter.Close(); err != nil {
			logrus.Debugf("Can't close compress writer: %s", err)
		}
		if err := pipeWriter.Close(); err != nil {
			logrus.Debugf("Can't close pipe writer: %s", err)
		}
	}()

//.........这里部分代码省略.........

//.........这里部分代码省略.........
		// Verify that 'filename' is within the build context
		filename, err = symlink.FollowSymlinkInScope(filename, absRoot)
		if err != nil {
			return fmt.Errorf("The Dockerfile (%s) must be within the build context (%s)", origDockerfile, root)
		}

		// Now reset the dockerfileName to be relative to the build context
		*dockerfileName, err = filepath.Rel(absRoot, filename)
		if err != nil {
			return err
		}
		// And canonicalize dockerfile name to a platform-independent one
		*dockerfileName, err = archive.CanonicalTarNameForPath(*dockerfileName)
		if err != nil {
			return fmt.Errorf("Cannot canonicalize dockerfile path %s: %v", *dockerfileName, err)
		}

		if _, err = os.Lstat(filename); os.IsNotExist(err) {
			return fmt.Errorf("Cannot locate Dockerfile: %s", origDockerfile)
		}
		var includes = []string{"."}

		excludes, err := utils.ReadDockerIgnore(path.Join(root, ".dockerignore"))
		if err != nil {
			return err
		}

		// If .dockerignore mentions .dockerignore or the Dockerfile
		// then make sure we send both files over to the daemon
		// because Dockerfile is, obviously, needed no matter what, and
		// .dockerignore is needed to know if either one needs to be
		// removed.  The deamon will remove them for us, if needed, after it
		// parses the Dockerfile.
		keepThem1, _ := fileutils.Matches(".dockerignore", excludes)
		keepThem2, _ := fileutils.Matches(*dockerfileName, excludes)
		if keepThem1 || keepThem2 {
			includes = append(includes, ".dockerignore", *dockerfileName)
		}

		if err := utils.ValidateContextDirectory(root, excludes); err != nil {
			return fmt.Errorf("Error checking context is accessible: '%s'. Please check permissions and try again.", err)
		}
		options := &archive.TarOptions{
			Compression:     archive.Uncompressed,
			ExcludePatterns: excludes,
			IncludeFiles:    includes,
		}
		context, err = archive.TarWithOptions(root, options)
		if err != nil {
			return err
		}
	}

	// windows: show error message about modified file permissions
	// FIXME: this is not a valid warning when the daemon is running windows. should be removed once docker engine for windows can build.
	if runtime.GOOS == "windows" {
		logrus.Warn(`SECURITY WARNING: You are building a Docker image from Windows against a Linux Docker host. All files and directories added to build context will have '-rwxr-xr-x' permissions. It is recommended to double check and reset permissions for sensitive files and directories.`)
	}

	var body io.Reader
	// Setup an upload progress bar
	// FIXME: ProgressReader shouldn't be this annoying to use
	if context != nil {
		sf := streamformatter.NewStreamFormatter(false)
		body = progressreader.New(progressreader.Config{
			In:        context,

func watchForChanges(files map[string]map[string]time.Time, dir string, ignore []string, ch chan Change) error {
	for {
		for file, _ := range files[dir] {
			if _, err := os.Stat(file); os.IsNotExist(err) {
				rel, err := filepath.Rel(dir, file)

				if err != nil {
					return err
				}

				delete(files[dir], file)

				ch <- Change{
					Operation: "remove",
					Base:      dir,
					Path:      rel,
				}
			}
		}

		filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
			if path == dir {
				return nil
			}

			if info.IsDir() {
				return nil
			}

			e, ok := files[dir][path]

			if !ok || e.Before(info.ModTime()) {
				rel, err := filepath.Rel(dir, path)
				if err != nil {
					return err
				}

				match, err := fileutils.Matches(rel, ignore)
				if err != nil {
					return err
				}

				if match {
					return nil
				}

				files[dir][path] = info.ModTime()

				ch <- Change{
					Operation: "add",
					Base:      dir,
					Path:      rel,
				}
			}

			return nil
		})

		time.Sleep(700 * time.Millisecond)
	}
}

//.........这里部分代码省略.........
	defer newDockerfile.Close()

	// And canonicalize dockerfile name to a platform-independent one
	relDockerfile, err = archive.CanonicalTarNameForPath(relDockerfile)
	if err != nil {
		return fmt.Errorf("cannot canonicalize dockerfile path %s: %v", relDockerfile, err)
	}

	f, err := os.Open(filepath.Join(contextDir, ".dockerignore"))
	if err != nil && !os.IsNotExist(err) {
		return err
	}

	var excludes []string
	if err == nil {
		excludes, err = utils.ReadDockerIgnore(f)
		if err != nil {
			return err
		}
	}

	if err := utils.ValidateContextDirectory(contextDir, excludes); err != nil {
		return fmt.Errorf("Error checking context: '%s'.", err)
	}

	// If .dockerignore mentions .dockerignore or the Dockerfile
	// then make sure we send both files over to the daemon
	// because Dockerfile is, obviously, needed no matter what, and
	// .dockerignore is needed to know if either one needs to be
	// removed.  The deamon will remove them for us, if needed, after it
	// parses the Dockerfile. Ignore errors here, as they will have been
	// caught by ValidateContextDirectory above.
	var includes = []string{"."}
	keepThem1, _ := fileutils.Matches(".dockerignore", excludes)
	keepThem2, _ := fileutils.Matches(relDockerfile, excludes)
	if keepThem1 || keepThem2 {
		includes = append(includes, ".dockerignore", relDockerfile)
	}

	context, err = archive.TarWithOptions(contextDir, &archive.TarOptions{
		Compression:     archive.Uncompressed,
		ExcludePatterns: excludes,
		IncludeFiles:    includes,
	})
	if err != nil {
		return err
	}

	// Wrap the tar archive to replace the Dockerfile entry with the rewritten
	// Dockerfile which uses trusted pulls.
	context = replaceDockerfileTarWrapper(context, newDockerfile, relDockerfile)

	// Setup an upload progress bar
	// FIXME: ProgressReader shouldn't be this annoying to use
	sf := streamformatter.NewStreamFormatter()
	var body io.Reader = progressreader.New(progressreader.Config{
		In:        context,
		Out:       cli.out,
		Formatter: sf,
		NewLines:  true,
		ID:        "",
		Action:    "Sending build context to Docker daemon",
	})

	var memory int64
	if *flMemoryString != "" {

func checkEnvIgnored(m *manifest.Manifest) error {
	//TODO
	if denv := filepath.Join(filepath.Dir(os.Args[0]), ".env"); exists(denv) {
		title := "<file>.env</file> in <file>.gitignore</file> and <file>.dockerignore</file>"
		startCheck(title)
		_, err := os.Stat(".dockerignore")
		if err != nil {
			diagnose(Diagnosis{
				Title:       title,
				Description: "<warning>It looks like you don't have a .dockerignore file</warning>",
				Kind:        "warning",
				DocsLink:    "https://docs.docker.com/engine/reference/builder/#/dockerignore-file",
			})
			return nil
		}

		_, err = os.Stat(".gitignore")
		if err != nil {
			diagnose(Diagnosis{
				Title:       title,
				Description: "<warning>It looks like you don't have a .gitignore file</warning>",
				Kind:        "warning",
				DocsLink:    "https://git-scm.com/docs/gitignore",
			})
			return nil
		}

		dockerIgnore, err := ioutil.ReadFile(filepath.Join(filepath.Dir(os.Args[0]), ".dockerignore"))
		if err != nil {
			return err
		}

		gitIgnore, err := ioutil.ReadFile(filepath.Join(filepath.Dir(os.Args[0]), ".gitignore"))
		if err != nil {
			return err
		}

		dockerIgnoreLines := strings.Split(string(dockerIgnore), "\n")
		gitIgnoreLines := strings.Split(string(gitIgnore), "\n")

		dockerIgnored, _ := fileutils.Matches(".env", dockerIgnoreLines)
		gitIgnored, _ := fileutils.Matches(".env", gitIgnoreLines)

		if !gitIgnored {
			diagnose(Diagnosis{
				Title:       title,
				Description: "<warning>It looks like you don't have your .env in your .gitignore file</warning>",
				Kind:        "warning",
				DocsLink:    "https://git-scm.com/docs/gitignore",
			})
		}

		if !dockerIgnored {
			diagnose(Diagnosis{
				Title:       title,
				Description: "<warning>It looks like you don't have your .env in your .dockerignore file</warning>",
				Kind:        "warning",
				DocsLink:    "https://docs.docker.com/engine/reference/builder/#/dockerignore-file",
			})
		}
		diagnose(Diagnosis{
			Title: title,
			Kind:  "success",
		})
	}
	return nil
}

// TarWithOptions creates an archive from the directory at `path`, only including files whose relative
// paths are included in `options.Includes` (if non-nil) or not in `options.Excludes`.
func TarWithOptions(srcPath string, options *TarOptions) (io.ReadCloser, error) {
	pipeReader, pipeWriter := io.Pipe()

	compressWriter, err := CompressStream(pipeWriter, options.Compression)
	if err != nil {
		return nil, err
	}

	go func() {
		ta := &tarAppender{
			TarWriter: tar.NewWriter(compressWriter),
			Buffer:    pools.BufioWriter32KPool.Get(nil),
			SeenFiles: make(map[uint64]string),
		}
		// this buffer is needed for the duration of this piped stream
		defer pools.BufioWriter32KPool.Put(ta.Buffer)

		// In general we log errors here but ignore them because
		// during e.g. a diff operation the container can continue
		// mutating the filesystem and we can see transient errors
		// from this

		if options.Includes == nil {
			options.Includes = []string{"."}
		}

		var renamedRelFilePath string // For when tar.Options.Name is set
		for _, include := range options.Includes {
			filepath.Walk(filepath.Join(srcPath, include), func(filePath string, f os.FileInfo, err error) error {
				if err != nil {
					log.Debugf("Tar: Can't stat file %s to tar: %s", srcPath, err)
					return nil
				}

				relFilePath, err := filepath.Rel(srcPath, filePath)
				if err != nil {
					return nil
				}

				skip, err := fileutils.Matches(relFilePath, options.Excludes)
				if err != nil {
					log.Debugf("Error matching %s", relFilePath, err)
					return err
				}

				if skip {
					if f.IsDir() {
						return filepath.SkipDir
					}
					return nil
				}

				// Rename the base resource
				if options.Name != "" && filePath == srcPath+"/"+filepath.Base(relFilePath) {
					renamedRelFilePath = relFilePath
				}
				// Set this to make sure the items underneath also get renamed
				if options.Name != "" {
					relFilePath = strings.Replace(relFilePath, renamedRelFilePath, options.Name, 1)
				}

				if err := ta.addTarFile(filePath, relFilePath); err != nil {
					log.Debugf("Can't add file %s to tar: %s", srcPath, err)
				}
				return nil
			})
		}

		// Make sure to check the error on Close.
		if err := ta.TarWriter.Close(); err != nil {
			log.Debugf("Can't close tar writer: %s", err)
		}
		if err := compressWriter.Close(); err != nil {
			log.Debugf("Can't close compress writer: %s", err)
		}
		if err := pipeWriter.Close(); err != nil {
			log.Debugf("Can't close pipe writer: %s", err)
		}
	}()

	return pipeReader, nil
}

func createTarball(base string) ([]byte, error) {
	cwd, err := os.Getwd()
	if err != nil {
		return nil, err
	}

	sym, err := filepath.EvalSymlinks(base)
	if err != nil {
		return nil, err
	}

	err = os.Chdir(sym)
	if err != nil {
		return nil, err
	}

	var includes = []string{"."}
	var excludes []string

	dockerIgnorePath := path.Join(sym, ".dockerignore")
	dockerIgnore, err := os.Open(dockerIgnorePath)
	if err != nil {
		if !os.IsNotExist(err) {
			return nil, err
		}
		//There is no docker ignore
		excludes = make([]string, 0)
	} else {
		excludes, err = dockerignore.ReadAll(dockerIgnore)
		if err != nil {
			return nil, err
		}
	}

	// If .dockerignore mentions .dockerignore or the Dockerfile
	// then make sure we send both files over to the daemon
	// because Dockerfile is, obviously, needed no matter what, and
	// .dockerignore is needed to know if either one needs to be
	// removed.  The deamon will remove them for us, if needed, after it
	// parses the Dockerfile.
	keepThem1, _ := fileutils.Matches(".dockerignore", excludes)
	keepThem2, _ := fileutils.Matches("Dockerfile", excludes)
	if keepThem1 || keepThem2 {
		includes = append(includes, ".dockerignore", "Dockerfile")
	}

	// if err := builder.ValidateContextDirectory(contextDirectory, excludes); err != nil {
	// 	return nil, fmt.Errorf("Error checking context is accessible: '%s'. Please check permissions and try again.", err)
	// }

	options := &archive.TarOptions{
		Compression:     archive.Gzip,
		ExcludePatterns: excludes,
		IncludeFiles:    includes,
	}

	out, err := archive.TarWithOptions(sym, options)
	if err != nil {
		return nil, err
	}

	bytes, err := ioutil.ReadAll(out)
	if err != nil {
		return nil, err
	}

	err = os.Chdir(cwd)
	if err != nil {
		return nil, err
	}

	return bytes, nil
}