dump: test proper permissions and directory name

internal/dump/tar_test.go

@@ -9,6 +9,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
 
@@ -68,6 +69,14 @@ func TestWriteTar(t *testing.T) {
 			},
 			target: "/",
 		},
+		{
+			name: "file and symlink in root",
+			args: archiver.TestDir{
+				"file1": archiver.TestFile{Content: "string"},
+				"file2": archiver.TestSymlink{Target: "file1"},
+			},
+			target: "/",
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -128,7 +137,7 @@ func checkTar(t *testing.T, testDir string, srcTar *bytes.Buffer) error {
 		}
 
 		matchPath := filepath.Join(testDir, hdr.Name)
-		match, err := os.Stat(matchPath)
+		match, err := os.Lstat(matchPath)
 		if err != nil {
 			return err
 		}
@@ -140,6 +149,10 @@ func checkTar(t *testing.T, testDir string, srcTar *bytes.Buffer) error {
 			return fmt.Errorf("modTime does not match, got: %s, want: %s", fileTime, tarTime)
 		}
 
+		if os.FileMode(hdr.Mode).Perm() != match.Mode().Perm() || os.FileMode(hdr.Mode)&^os.ModePerm != 0 {
+			return fmt.Errorf("mode does not match, got: %v, want: %v", os.FileMode(hdr.Mode), match.Mode())
+		}
+
 		if hdr.Typeflag == tar.TypeDir {
 			// this is a folder
 			if hdr.Name == "." {
@@ -151,7 +164,17 @@ func checkTar(t *testing.T, testDir string, srcTar *bytes.Buffer) error {
 			if filepath.Base(hdr.Name) != filebase {
 				return fmt.Errorf("foldernames don't match got %v want %v", filepath.Base(hdr.Name), filebase)
 			}
-
+			if !strings.HasSuffix(hdr.Name, "/") {
+				return fmt.Errorf("foldernames must end with separator got %v", hdr.Name)
+			}
+		} else if hdr.Typeflag == tar.TypeSymlink {
+			target, err := fs.Readlink(matchPath)
+			if err != nil {
+				return err
+			}
+			if target != hdr.Linkname {
+				return fmt.Errorf("symlink target does not match, got %s want %s", target, hdr.Linkname)
+			}
 		} else {
 			if match.Size() != hdr.Size {
 				return fmt.Errorf("size does not match got %v want %v", hdr.Size, match.Size())