[PATCH 1 of 3] Start installer process as sudo if possible

[Wald Commits]

# HG changeset patch
# User Andre Heinecke <andre.heinecke at intevation.de>
# Date 1403686503 -7200
# Node ID a9a57dc1eb2f83faf1d0c60ca36e72b1d329868c
# Parent  c7a35fa302ec64f2e52eac3e97694b4758769f9b
Start installer process as sudo if possible.

diff -r c7a35fa302ec -r a9a57dc1eb2f ui/installwrapper.cpp
--- a/ui/installwrapper.cpp	Tue Jun 24 18:10:10 2014 +0200
+++ b/ui/installwrapper.cpp	Wed Jun 25 10:55:03 2014 +0200
@@ -150,20 +150,46 @@
     }
 #else /* WIN32 */
     QProcess installerProcess;
-    installerProcess.setProgram(cinstProcInfo.absoluteFilePath());
     QStringList parameters;
 
     choicesFile.setAutoRemove(false);
     parameters << "list=" + mCertListFile << "choices=" + choicesFile.fileName();
-    installerProcess.setArguments(parameters);
 
+    bool sudo_started = false;
+    bool use_sudo = is_admin();
+    if (use_sudo) {
+        QStringList sudoPrograms;
+        sudoPrograms << "gksudo" << "kdesudo" << "sudo";
+        QStringList sudoParams;
+        sudoParams <<cinstProcInfo.absoluteFilePath() << parameters;
+        installerProcess.setArguments(sudoParams);
 
-    qDebug() << "Starting process " << cinstFileName <<" params: " << parameters;
-    installerProcess.start();
-    if (!installerProcess.waitForStarted() ||
-        installerProcess.state() == QProcess::NotRunning) {
-        emit error (tr("Failed to start installer process."));
-        return;
+        foreach (const QString &sProg, sudoPrograms) {
+            installerProcess.setProgram(sProg);
+            qDebug() << "Starting process " << sProg <<" params: " << sudoParams;
+            installerProcess.start();
+            if (!installerProcess.waitForStarted() ||
+                installerProcess.state() == QProcess::NotRunning) {
+                continue;
+            } else {
+                sudo_started = true;
+                break;
+            }
+        }
+    }
+
+    /* Fallback to start without sudo */
+    if (!use_sudo || !sudo_started) {
+        installerProcess.setProgram(cinstProcInfo.absoluteFilePath());
+        installerProcess.setArguments(parameters);
+
+        qDebug() << "Starting process " << cinstFileName <<" params: " << parameters;
+        installerProcess.start();
+        if (!installerProcess.waitForStarted() ||
+            installerProcess.state() == QProcess::NotRunning) {
+            emit error (tr("Failed to start installer process."));
+            return;
+        }
     }
 
     installerProcess.waitForFinished();