Add more tests for pkg/chrootarchive

Fixes issue #11601

Change-Id: Ifc1dbcc59cc4dc581ed43fc8fbe43fbaec4ccad0
Signed-off-by: Yestin Sun <sunyi0804@gmail.com>

chrootarchive/archive_test.go

@@ -1,9 +1,12 @@
 package chrootarchive
 
 import (
+	"bytes"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
+	"path"
 	"path/filepath"
 	"testing"
 	"time"
@@ -45,6 +48,148 @@ func TestChrootTarUntar(t *testing.T) {
 	}
 }
 
+func TestChrootUntarEmptyArchive(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "docker-TestChrootUntarEmptyArchive")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+	if err := Untar(nil, tmpdir, nil); err == nil {
+		t.Fatal("expected error on empty archive")
+	}
+}
+
+func prepareSourceDirectory(numberOfFiles int, targetPath string, makeLinks bool) (int, error) {
+	fileData := []byte("fooo")
+	for n := 0; n < numberOfFiles; n++ {
+		fileName := fmt.Sprintf("file-%d", n)
+		if err := ioutil.WriteFile(path.Join(targetPath, fileName), fileData, 0700); err != nil {
+			return 0, err
+		}
+		if makeLinks {
+			if err := os.Link(path.Join(targetPath, fileName), path.Join(targetPath, fileName+"-link")); err != nil {
+				return 0, err
+			}
+		}
+	}
+	totalSize := numberOfFiles * len(fileData)
+	return totalSize, nil
+}
+
+func TestChrootTarUntarWithSoftLink(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "docker-TestChrootTarUntarWithSoftLink")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+	src := filepath.Join(tmpdir, "src")
+	if err := os.MkdirAll(src, 0700); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := prepareSourceDirectory(10, src, true); err != nil {
+		t.Fatal(err)
+	}
+	dest := filepath.Join(tmpdir, "dest")
+	if err := TarUntar(src, dest); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestChrootCopyWithTar(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "docker-TestChrootCopyWithTar")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+	src := filepath.Join(tmpdir, "src")
+	if err := os.MkdirAll(src, 0700); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := prepareSourceDirectory(10, src, true); err != nil {
+		t.Fatal(err)
+	}
+	dest := filepath.Join(tmpdir, "dest")
+	// Copy directory
+	if err := CopyWithTar(src, dest); err != nil {
+		t.Fatal(err)
+	}
+	// Copy file
+	srcfile := filepath.Join(src, "file-1")
+	if err := CopyWithTar(srcfile, dest); err != nil {
+		t.Fatal(err)
+	}
+	// Copy symbolic link
+	linkfile := filepath.Join(src, "file-1-link")
+	if err := CopyWithTar(linkfile, dest); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestChrootCopyFileWithTar(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "docker-TestChrootCopyFileWithTar")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+	src := filepath.Join(tmpdir, "src")
+	if err := os.MkdirAll(src, 0700); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := prepareSourceDirectory(10, src, true); err != nil {
+		t.Fatal(err)
+	}
+	dest := filepath.Join(tmpdir, "dest")
+	// Copy directory
+	if err := CopyFileWithTar(src, dest); err == nil {
+		t.Fatal("Expected error on copying directory")
+	}
+	// Copy file
+	srcfile := filepath.Join(src, "file-1")
+	if err := CopyFileWithTar(srcfile, dest); err != nil {
+		t.Fatal(err)
+	}
+	// Copy symbolic link
+	linkfile := filepath.Join(src, "file-1-link")
+	if err := CopyFileWithTar(linkfile, dest); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestChrootUntarPath(t *testing.T) {
+	tmpdir, err := ioutil.TempDir("", "docker-TestChrootUntarPath")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+	src := filepath.Join(tmpdir, "src")
+	if err := os.MkdirAll(src, 0700); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := prepareSourceDirectory(10, src, true); err != nil {
+		t.Fatal(err)
+	}
+	dest := filepath.Join(tmpdir, "dest")
+	// Untar a directory
+	if err := UntarPath(src, dest); err == nil {
+		t.Fatal("Expected error on untaring a directory")
+	}
+
+	// Untar a tar file
+	stream, err := archive.Tar(src, archive.Uncompressed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	buf := new(bytes.Buffer)
+	buf.ReadFrom(stream)
+	tarfile := filepath.Join(tmpdir, "src.tar")
+	if err := ioutil.WriteFile(tarfile, buf.Bytes(), 0644); err != nil {
+		t.Fatal(err)
+	}
+	if err := UntarPath(tarfile, dest); err != nil {
+		t.Fatal(err)
+	}
+}
+
 type slowEmptyTarReader struct {
 	size      int
 	offset    int