[libcalamares] Introduce quit-at-end

- In some cases, it makes sense to close Calamares automatically
  when it is done. Set *quit-at-end* to do so -- although this
  probably also means you should remove the *finished* page.

settings.conf

@@ -188,3 +188,11 @@ disable-cancel: false
 #
 # YAML: boolean.
 disable-cancel-during-exec: false
+
+# If this is set to true, then once the end of the sequence has
+# been reached, the quit (done) button is clicked automatically
+# and Calamares will close. Default is false: the user will see
+# that the end of installation has been reached, and that things are ok.
+#
+#
+quit-at-end: false

src/libcalamares/Settings.cpp

@@ -232,6 +232,7 @@ Settings::Settings( const QString& settingsFilePath, bool debugMode )
             m_isSetupMode = requireBool( config, "oem-setup", !m_doChroot );
             m_disableCancel = requireBool( config, "disable-cancel", false );
             m_disableCancelDuringExec = requireBool( config, "disable-cancel-during-exec", false );
+            m_quitAtEnd = requireBool( config, "quit-at-end", false );
         }
         catch ( YAML::Exception& e )
         {

src/libcalamares/Settings.h

@@ -101,6 +101,9 @@ public:
     /** @brief Temporary setting of disable-cancel: can't cancel during exec. */
     bool disableCancelDuringExec() const { return m_disableCancelDuringExec; }
 
+    /** @brief Is quit-at-end set? (Quit automatically when done) */
+    bool quitAtEnd() const { return m_quitAtEnd; }
+
 private:
     static Settings* s_instance;
 
@@ -117,6 +120,7 @@ private:
     bool m_promptInstall;
     bool m_disableCancel;
     bool m_disableCancelDuringExec;
+    bool m_quitAtEnd;
 };
 
 }  // namespace Calamares

src/libcalamaresui/ViewManager.cpp

@@ -426,6 +426,10 @@ ViewManager::updateButtonLabels()
         m_quit->setVisible( true );  // At end, always visible and enabled.
         setButtonIcon( m_quit, "dialog-ok-apply" );
         updateCancelEnabled( true );
+        if ( settings->quitAtEnd() )
+        {
+            m_quit->click();
+        }
     }
     else
     {