Merge pull request #5054 from phillipp/dump-compress-zip

dump: add --compress flag to compress archives

internal/dump/zip.go

@@ -39,6 +39,9 @@ func (d *Dumper) dumpNodeZip(ctx context.Context, node *restic.Node, zw *zip.Wri
 		Modified:           node.ModTime,
 	}
 	header.SetMode(node.Mode)
+	if node.Type == restic.NodeTypeFile {
+		header.Method = zip.Deflate
+	}
 
 	if node.Type == restic.NodeTypeDir {
 		header.Name += "/"

internal/dump/zip_test.go

@@ -101,6 +101,9 @@ func checkZip(t *testing.T, testDir string, srcZip *bytes.Buffer) error {
 				return fmt.Errorf("symlink target does not match, got %s want %s", string(linkName), target)
 			}
 		default:
+			if f.Method != zip.Deflate {
+				return fmt.Errorf("expected compression method got %v want %v", f.Method, zip.Deflate)
+			}
 			if uint64(match.Size()) != f.UncompressedSize64 {
 				return fmt.Errorf("size does not match got %v want %v", f.UncompressedSize64, match.Size())
 			}