service/upower: start upower dbus service if inactive

src/dbus/CMakeLists.txt

@@ -9,6 +9,7 @@ qt_add_dbus_interface(DBUS_INTERFACES
 
 qt_add_library(quickshell-dbus STATIC
 	properties.cpp
+	bus.cpp
 	${DBUS_INTERFACES}
 )
 

src/dbus/bus.cpp

@@ -0,0 +1,57 @@
+#include "bus.hpp" // NOLINT
+#include <functional>
+
+#include <qcontainerfwd.h>
+#include <qdbusconnection.h>
+#include <qdbusmessage.h>
+#include <qdbuspendingcall.h>
+#include <qdbuspendingreply.h>
+#include <qlogging.h>
+#include <qloggingcategory.h>
+#include <qobject.h>
+#include <qtypes.h>
+#include <qvariant.h>
+
+namespace qs::dbus {
+
+Q_LOGGING_CATEGORY(logDbus, "quickshell.dbus", QtWarningMsg);
+
+void tryLaunchService(
+    QObject* parent,
+    QDBusConnection& connection,
+    const QString& serviceName,
+    const std::function<void(bool)>& callback
+) {
+	qCDebug(logDbus) << "Attempting to launch service" << serviceName;
+
+	auto message = QDBusMessage::createMethodCall(
+	    "org.freedesktop.DBus",
+	    "/org/freedesktop/DBus",
+	    "org.freedesktop.DBus",
+	    "StartServiceByName"
+	);
+
+	message << serviceName << 0u;
+	auto pendingCall = connection.asyncCall(message);
+
+	auto* call = new QDBusPendingCallWatcher(pendingCall, parent);
+
+	auto responseCallback = [callback, serviceName](QDBusPendingCallWatcher* call) {
+		const QDBusPendingReply<quint32> reply = *call;
+
+		if (reply.isError()) {
+			qCWarning(logDbus).noquote().nospace()
+			    << "Could not launch service " << serviceName << ": " << reply.error();
+			callback(false);
+		} else {
+			qCDebug(logDbus) << "Service launch successful for" << serviceName;
+			callback(true);
+		}
+
+		delete call;
+	};
+
+	QObject::connect(call, &QDBusPendingCallWatcher::finished, parent, responseCallback);
+}
+
+} // namespace qs::dbus

src/dbus/bus.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <functional>
+
+#include <qcontainerfwd.h>
+#include <qdbusconnection.h>
+#include <qobject.h>
+
+namespace qs::dbus {
+
+void tryLaunchService(
+    QObject* parent,
+    QDBusConnection& connection,
+    const QString& serviceName,
+    const std::function<void(bool)>& callback
+);
+
+}

src/services/upower/core.cpp

@@ -14,6 +14,7 @@
 #include <qtmetamacros.h>
 
 #include "../../core/model.hpp"
+#include "../../dbus/bus.hpp"
 #include "../../dbus/properties.hpp"
 #include "dbus_service.h"
 #include "device.hpp"
@@ -23,7 +24,7 @@ namespace qs::service::upower {
 Q_LOGGING_CATEGORY(logUPower, "quickshell.service.upower", QtWarningMsg);
 
 UPower::UPower() {
-	qCDebug(logUPower) << "Starting UPower";
+	qCDebug(logUPower) << "Starting UPower Service";
 
 	auto bus = QDBusConnection::systemBus();
 
@@ -36,10 +37,22 @@ UPower::UPower() {
 	    new DBusUPowerService("org.freedesktop.UPower", "/org/freedesktop/UPower", bus, this);
 
 	if (!this->service->isValid()) {
-		qCWarning(logUPower) << "Cannot connect to the UPower service.";
+		qCDebug(logUPower) << "UPower service is not currently running, attempting to start it.";
-		return;
+
+		dbus::tryLaunchService(this, bus, "org.freedesktop.UPower", [this](bool success) {
+			if (success) {
+				qCDebug(logUPower) << "Successfully launched UPower service.";
+				this->init();
+			} else {
+				qCWarning(logUPower) << "Could not start UPower. The UPower service will not work.";
+			}
+		});
+	} else {
+		this->init();
+	}
 }
 
+void UPower::init() {
 	QObject::connect(
 	    &this->pOnBattery,
 	    &dbus::AbstractDBusProperty::changed,

src/services/upower/core.hpp

@@ -35,6 +35,7 @@ private slots:
 private:
 	explicit UPower();
 
+	void init();
 	void registerExisting();
 	void registerDevice(const QString& path);