Allow shutdown via CLI

cli/application.cpp

@@ -34,6 +34,7 @@ Application::Application() :
     // setup argument callbacks
     m_args.status.setCallback(bind(&Application::printStatus, this, _1));
     m_args.log.setCallback(bind(&Application::requestLog, this, _1));
+    m_args.stop.setCallback(bind(&Application::requestShutdown, this, _1));
     m_args.restart.setCallback(bind(&Application::requestRestart, this, _1));
     m_args.rescan.setCallback(bind(&Application::requestRescan, this, _1));
     m_args.rescanAll.setCallback(bind(&Application::requestRescanAll, this, _1));
@@ -168,6 +169,14 @@ void Application::requestLog(const ArgumentOccurrence &)
     cerr.flush();
 }
 
+void Application::requestShutdown(const ArgumentOccurrence &)
+{
+    connect(&m_connection, &SyncthingConnection::shutdownTriggered, &QCoreApplication::quit);
+    m_connection.shutdown();
+    cerr << "Request shutdown " << m_settings.syncthingUrl.toLocal8Bit().data() << " ...";
+    cerr.flush();
+}
+
 void Application::requestRestart(const ArgumentOccurrence &)
 {
     connect(&m_connection, &SyncthingConnection::restartTriggered, &QCoreApplication::quit);

cli/application.h

@@ -27,6 +27,7 @@ private slots:
 
 private:
     void requestLog(const ArgumentOccurrence &);
+    void requestShutdown(const ArgumentOccurrence &);
     void requestRestart(const ArgumentOccurrence &);
     void requestRescan(const ArgumentOccurrence &occurrence);
     void requestRescanAll(const ArgumentOccurrence &);

cli/args.cpp

@@ -6,6 +6,7 @@ Args::Args() :
     help(parser),
     status("status", 's', "shows the status"),
     log("log", 'l', "shows the Syncthing log"),
+    stop("stop", '\0', "stops Syncthing"),
     restart("restart", '\0', "restarts Syncthing"),
     rescan("rescan", 'r', "rescans the specified directories"),
     rescanAll("rescan-all", '\0', "rescans all directories"),
@@ -31,8 +32,7 @@ Args::Args() :
     resume.setValueNames({"dev ID"});
     resume.setRequiredValueCount(-1);
 
-    parser.setMainArguments({&status, &log, &restart, &rescan, &rescanAll, &pause, &pauseAll,
-                             &resume, &resumeAll,
+    parser.setMainArguments({&status, &log, &stop, &restart, &rescan, &rescanAll, &pause, &pauseAll, &resume, &resumeAll,
                              &configFile, &apiKey, &url, &credentials, &certificate, &help});
 
     // allow setting default values via environment

cli/args.h

@@ -12,7 +12,7 @@ struct Args
     Args();
     ArgumentParser parser;
     HelpArgument help;
-    OperationArgument status, log, restart, rescan, rescanAll, pause, pauseAll, resume, resumeAll;
+    OperationArgument status, log, stop, restart, rescan, rescanAll, pause, pauseAll, resume, resumeAll;
     ConfigValueArgument dir, dev;
     ConfigValueArgument configFile, apiKey, url, credentials, certificate;
 };

connector/syncthingconnection.cpp

@@ -359,6 +359,16 @@ void SyncthingConnection::restart()
     QObject::connect(postData(QStringLiteral("system/restart"), QUrlQuery()), &QNetworkReply::finished, this, &SyncthingConnection::readRestart);
 }
 
+/*!
+ * \brief Requests Syncthing to exit and not restart.
+ *
+ * The signal error() is emitted when the request was not successful.
+ */
+void SyncthingConnection::shutdown()
+{
+    QObject::connect(postData(QStringLiteral("system/shutdown"), QUrlQuery()), &QNetworkReply::finished, this, &SyncthingConnection::readShutdown);
+}
+
 /*!
  * \brief Considers all notifications as read; hence might trigger a status update.
  */
@@ -1396,6 +1406,22 @@ void SyncthingConnection::readRestart()
     }
 }
 
+/*!
+ * \brief Reads results of shutdown().
+ */
+void SyncthingConnection::readShutdown()
+{
+    auto *reply = static_cast<QNetworkReply *>(sender());
+    reply->deleteLater();
+    switch(reply->error()) {
+    case QNetworkReply::NoError:
+        emit shutdownTriggered();
+        break;
+    default:
+        emit error(tr("Unable to request shutdown: ") + reply->errorString());
+    }
+}
+
 /*!
  * \brief Sets the connection status. Ensures statusChanged() is emitted.
  * \param status Specifies the status; should be either SyncthingStatus::Disconnected or SyncthingStatus::Default. There is no use

connector/syncthingconnection.h

@@ -212,6 +212,7 @@ public Q_SLOTS:
     void rescan(const QString &dirId);
     void rescanAllDirs();
     void restart();
+    void shutdown();
     void considerAllNotificationsRead();
 
 Q_SIGNALS:
@@ -232,6 +233,7 @@ Q_SIGNALS:
     void pauseTriggered(const QString &devId);
     void resumeTriggered(const QString &devId);
     void restartTriggered();
+    void shutdownTriggered();
 
 private Q_SLOTS:
     void requestConfig();
@@ -262,6 +264,7 @@ private Q_SLOTS:
     void readRescan();
     void readPauseResume();
     void readRestart();
+    void readShutdown();
 
     void continueConnecting();
     void continueReconnecting();