improved linux sudo gui

Author: Skycoder42

.travis.yml

@@ -8,7 +8,6 @@ sudo: required
 env:
   global:
     - QT_VER=5.9.1
-    - PROJECT=QtAutoUpdater
 
 matrix:
   include:

appveyor.yml

@@ -6,7 +6,6 @@ version: build-{build}
 
 environment:
   QT_VER: 5.9.1
-  PROJECT: QtAutoUpdater
 
   matrix:
     - PLATFORM: msvc2017_64

src/autoupdatergui/adminauthorization_x11.cpp

@@ -54,15 +54,19 @@
 #include <sys/ioctl.h>
 #include <sys/types.h>
 #include <sys/wait.h>
-#include <QProcess>
+#include <QtCore/QProcess>
+#include <QtCore/QStandardPaths>
 #include <errno.h>
 
 using namespace QtAutoUpdater;
 
-#define KDESU_COMMAND QStringLiteral("/usr/bin/kdesu")
 #define SU_COMMAND "/usr/bin/sudo"
 
 static bool execAdminFallback(const QString &program, const QStringList &arguments);
+static QList<QPair<QString, QStringList>> suFontends = {
+	{QStringLiteral("kdesu"), {QStringLiteral("-c")}},
+	{QStringLiteral("gksu"), {}}
+};
 
 // has no guarantee to work
 bool AdminAuthorization::hasAdminRights()
@@ -72,20 +76,21 @@ bool AdminAuthorization::hasAdminRights()
 
 bool AdminAuthorization::executeAsAdmin(const QString &program, const QStringList &arguments)
 {
-	QString command;
-	QStringList args;
+	foreach(auto su, suFontends) {
+		auto command = QStandardPaths::findExecutable(su.first);
+		if(!command.isEmpty()) {
+			auto args = su.second;
 
-	if(QFile::exists(KDESU_COMMAND)) {
-		command = KDESU_COMMAND;
-		args.append(QStringLiteral("-c"));
-	} else
-		return execAdminFallback(program, arguments);
+			QStringList tmpList(program);
+			tmpList.append(arguments);
+			args.append(QLatin1Char('\"') + tmpList.join(QStringLiteral("\" \"")) + QLatin1Char('\"'));
 
-	QStringList tmpList(program);
-	tmpList.append(arguments);
-	args.append(QLatin1Char('\"') + tmpList.join(QStringLiteral("\" \"")) + QLatin1Char('\"'));
+			return QProcess::startDetached(command, args);
+		}
+	}
+
+	return execAdminFallback(program, arguments);
 
-	return QProcess::startDetached(command, args);
 }
 
 static bool execAdminFallback(const QString &program, const QStringList &arguments)