@@ -3,6 +3,7 @@ package chrootarchive

 import (

 	"bytes"

 	"fmt"

+	"hash/crc32"

 	"io"

 	"io/ioutil"

 	"os"

@@ -113,6 +114,16 @@ func prepareSourceDirectory(numberOfFiles int, targetPath string, makeSymLinks b

 	return totalSize, nil

 }

+func getHash(filename string) (uint32, error) {

+	stream, err := ioutil.ReadFile(filename)

+	if err != nil {

+		return 0, err

+	}

+	hash := crc32.NewIEEE()

+	hash.Write(stream)

+	return hash.Sum32(), nil

+}

+

 func compareDirectories(src string, dest string) error {

 	changes, err := archive.ChangesDirs(dest, src)

 	if err != nil {

@@ -124,6 +135,21 @@ func compareDirectories(src string, dest string) error {

 	return nil

 }

+func compareFiles(src string, dest string) error {

+	srcHash, err := getHash(src)

+	if err != nil {

+		return err

+	}

+	destHash, err := getHash(dest)

+	if err != nil {

+		return err

+	}

+	if srcHash != destHash {

+		return fmt.Errorf("%s is different from %s", src, dest)

+	}

+	return nil

+}

+

 func TestChrootTarUntarWithSymlink(t *testing.T) {

 	tmpdir, err := ioutil.TempDir("", "docker-TestChrootTarUntarWithSymlink")

 	if err != nil {

@@ -176,6 +202,9 @@ func TestChrootCopyWithTar(t *testing.T) {

 	if err := CopyWithTar(srcfile, destfile); err != nil {

 		t.Fatal(err)

 	}

+	if err := compareFiles(srcfile, destfile); err != nil {

+		t.Fatal(err)

+	}

 	// Copy symbolic link

 	srcLinkfile := filepath.Join(src, "file-1-link")

@@ -184,6 +213,9 @@ func TestChrootCopyWithTar(t *testing.T) {

 	if err := CopyWithTar(srcLinkfile, destLinkfile); err != nil {

 		t.Fatal(err)

 	}

+	if err := compareFiles(srcLinkfile, destLinkfile); err != nil {

+		t.Fatal(err)

+	}

 }

 func TestChrootCopyFileWithTar(t *testing.T) {

@@ -213,6 +245,9 @@ func TestChrootCopyFileWithTar(t *testing.T) {

 	if err := CopyFileWithTar(srcfile, destfile); err != nil {

 		t.Fatal(err)

 	}

+	if err := compareFiles(srcfile, destfile); err != nil {

+		t.Fatal(err)

+	}

 	// Copy symbolic link

 	srcLinkfile := filepath.Join(src, "file-1-link")

@@ -221,6 +256,9 @@ func TestChrootCopyFileWithTar(t *testing.T) {

 	if err := CopyFileWithTar(srcLinkfile, destLinkfile); err != nil {

 		t.Fatal(err)

 	}

+	if err := compareFiles(srcLinkfile, destLinkfile); err != nil {

+		t.Fatal(err)

+	}

 }

 func TestChrootUntarPath(t *testing.T) {