Insert sudo only at the beginning of command in deep scan #495 (#539)

* Insert `sudo` only at the beginning of command in deep scan #495

* Fix testcase

scan/executil.go

@@ -327,7 +327,6 @@ func getSSHLogger(log ...*logrus.Entry) *logrus.Entry {
 func decorateCmd(c conf.ServerInfo, cmd string, sudo bool) string {
 	if sudo && c.User != "root" && !c.IsContainer() {
 		cmd = fmt.Sprintf("sudo -S %s", cmd)
-		cmd = strings.Replace(cmd, "|", "| sudo ", -1)
 	}
 
 	// If you are using pipe and you want to detect preprocessing errors, remove comment out

scan/executil_test.go

@@ -63,7 +63,7 @@ func TestDecorateCmd(t *testing.T) {
 			conf:     config.ServerInfo{User: "non-roor"},
 			cmd:      "ls | grep hoge",
 			sudo:     true,
-			expected: "sudo -S ls | sudo  grep hoge",
+			expected: "sudo -S ls | grep hoge",
 		},
 		// -------------docker-------------
 		// root sudo false docker