@@ -12,11 +12,13 @@ import (

 	"github.com/Sirupsen/logrus"

 )

-func Exclusion(pattern string) bool {

+// exclusion return true if the specified pattern is an exclusion

+func exclusion(pattern string) bool {

 	return pattern[0] == '!'

 }

-func Empty(pattern string) bool {

+// empty return true if the specified pattern is empty

+func empty(pattern string) bool {

 	return pattern == ""

 }

@@ -35,10 +37,10 @@ func CleanPatterns(patterns []string) ([]string, [][]string, bool, error) {

 	for _, pattern := range patterns {

 		// Eliminate leading and trailing whitespace.

 		pattern = strings.TrimSpace(pattern)

-		if Empty(pattern) {

+		if empty(pattern) {

 			continue

 		}

-		if Exclusion(pattern) {

+		if exclusion(pattern) {

 			if len(pattern) == 1 {

 				return nil, nil, false, errors.New("Illegal exclusion pattern: !")

 			}

@@ -46,7 +48,7 @@ func CleanPatterns(patterns []string) ([]string, [][]string, bool, error) {

 		}

 		pattern = filepath.Clean(pattern)

 		cleanedPatterns = append(cleanedPatterns, pattern)

-		if Exclusion(pattern) {

+		if exclusion(pattern) {

 			pattern = pattern[1:]

 		}

 		patternDirs = append(patternDirs, strings.Split(pattern, "/"))

@@ -86,7 +88,7 @@ func OptimizedMatches(file string, patterns []string, patDirs [][]string) (bool,

 	for i, pattern := range patterns {

 		negative := false

-		if Exclusion(pattern) {

+		if exclusion(pattern) {

 			negative = true

 			pattern = pattern[1:]

 		}

@@ -116,6 +118,9 @@ func OptimizedMatches(file string, patterns []string, patDirs [][]string) (bool,

 	return matched, nil

 }

+// CopyFile copies from src to dst until either EOF is reached

+// on src or an error occurs. It verifies src exists and remove

+// the dst if it exists.

 func CopyFile(src, dst string) (int64, error) {

 	cleanSrc := filepath.Clean(src)

 	cleanDst := filepath.Clean(dst)

@@ -138,6 +143,8 @@ func CopyFile(src, dst string) (int64, error) {

 	return io.Copy(df, sf)

 }

+// GetTotalUsedFds Returns the number of used File Descriptors by

+// reading it via /proc filesystem.

 func GetTotalUsedFds() int {

 	if fds, err := ioutil.ReadDir(fmt.Sprintf("/proc/%d/fd", os.Getpid())); err != nil {

 		logrus.Errorf("Error opening /proc/%d/fd: %s", os.Getpid(), err)

@@ -4,6 +4,7 @@ import (

 	"io/ioutil"

 	"os"

 	"path"

+	"path/filepath"

 	"testing"

 )

@@ -268,7 +269,7 @@ func TestSingleExclamationError(t *testing.T) {

 // A string preceded with a ! should return true from Exclusion.

 func TestExclusion(t *testing.T) {

-	exclusion := Exclusion("!")

+	exclusion := exclusion("!")

 	if !exclusion {

 		t.Errorf("failed to get true for a single !, got %v", exclusion)

 	}

@@ -298,7 +299,7 @@ func TestMatchesWithMalformedPatterns(t *testing.T) {

 // An empty string should return true from Empty.

 func TestEmpty(t *testing.T) {

-	empty := Empty("")

+	empty := empty("")

 	if !empty {

 		t.Errorf("failed to get true for an empty string, got %v", empty)

 	}

@@ -355,3 +356,47 @@ func TestCleanPatternsFolderSplit(t *testing.T) {

 		t.Errorf("expected first element in dirs slice to be config, got %v", dirs[0][1])

 	}

 }

+

+func TestCreateIfNotExistsDir(t *testing.T) {

+	tempFolder, err := ioutil.TempDir("", "docker-fileutils-test")

+	if err != nil {

+		t.Fatal(err)

+	}

+	defer os.RemoveAll(tempFolder)

+

+	folderToCreate := filepath.Join(tempFolder, "tocreate")

+

+	if err := CreateIfNotExists(folderToCreate, true); err != nil {

+		t.Fatal(err)

+	}

+	fileinfo, err := os.Stat(folderToCreate)

+	if err != nil {

+		t.Fatalf("Should have create a folder, got %v", err)

+	}

+

+	if !fileinfo.IsDir() {

+		t.Fatalf("Should have been a dir, seems it's not")

+	}

+}

+

+func TestCreateIfNotExistsFile(t *testing.T) {

+	tempFolder, err := ioutil.TempDir("", "docker-fileutils-test")

+	if err != nil {

+		t.Fatal(err)

+	}

+	defer os.RemoveAll(tempFolder)

+

+	fileToCreate := filepath.Join(tempFolder, "file/to/create")

+

+	if err := CreateIfNotExists(fileToCreate, false); err != nil {

+		t.Fatal(err)

+	}

+	fileinfo, err := os.Stat(fileToCreate)

+	if err != nil {

+		t.Fatalf("Should have create a file, got %v", err)

+	}

+

+	if fileinfo.IsDir() {

+		t.Fatalf("Should have been a file, seems it's not")

+	}

+}