kded: rework phases logic to take any desktop session into account

much like XDG autostart except for KDED modules, requires adjustments to
modules that are automatically loaded in phase-1

in the future the logic may apply not only to modules during startup but
also when attempting to load a module in general

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

kded/HOWTO

@@ -26,11 +26,11 @@ is not running (i.e. when running a KDE application in another environment).
 [The following paragraph was copied from kdebase/workspace/ksmserver/README]
 The exact way autoloading works is controlled by X-KDE-Kded-phase=,
 which may be 0, 1 or 2 (the default). Kded phase 0 means the module is
-always loaded by kded, even outside of KDE session. It should used only
-by kded modules which must be always running. Kded phase 1 modules are
-loaded right after kded startup, but only during KDE startup, i.e. it is
-for modules that are always needed by the KDE session. Phase 2 modules
-will be loaded later. 
+always loaded by kded, even outside of the current desktop session. It should
+used only by kded modules which must be always running. Kded phase 1 modules are
+loaded right after kded startup and is for modules that must be loaded for
+specific desktop session. Phase 2 modules will be loaded later by ksmserver
+and only for KDE session.
 
 Normally KDED modules are loaded whenever they are accessed, so you don't
 need autoloading enabled. On demand loading can be disabled by putting

kded/kded.cpp

@@ -203,26 +203,38 @@ static int phaseForModule(const KService::Ptr& service)
     return (phasev.isValid() ? phasev.toInt() : 2);
 }
 
+static bool allowedForDesktop(const KService::Ptr &service, const QString &desktop)
+{
+    const QString only_show_in = service->property("OnlyShowIn", QVariant::String).toString();
+    kDebug(7020) << "only_show_in" << service->entryPath() << only_show_in;
+    if (only_show_in.isEmpty()) {
+        return true;
+    }
+    const QStringList only_show_in_list = only_show_in.split(QLatin1Char(';'));
+    return only_show_in_list.contains(desktop);
+}
+
+static bool excludedForDesktop(const KService::Ptr &service, const QString &desktop)
+{
+    const QString not_show_in = service->property("NotShowIn", QVariant::String).toString();
+    kDebug(7020) << "not_show_in" << service->entryPath() << not_show_in;
+    if (not_show_in.isEmpty()) {
+        return false;
+    }
+    const QStringList not_show_in_list = not_show_in.split(QLatin1Char(';'));
+    return !not_show_in_list.contains(desktop);
+}
+
 void Kded::initModules()
 {
     m_dontLoad.clear();
-    bool kde_running = !qgetenv("KDE_FULL_SESSION").isEmpty();
-    if (!kde_running) {
-        kde_running = (QProcess::execute(QString::fromLatin1("kcheckrunning")) == 0);
-    }
-    if (kde_running) {
-        // not the same user like the one running the session (most likely we're run via sudo or something)
-        const QByteArray sessionUID = qgetenv("KDE_SESSION_UID");
-        if (!sessionUID.isEmpty() && uid_t(sessionUID.toInt()) != ::getuid()) {
-            kde_running = false;
-        }
-    }
-    kDebug(7020) << "kde_running" << kde_running;
+    const QString current_desktop = QString::fromLocal8Bit(qgetenv("XDG_CURRENT_DESKTOP"));
+    kDebug(7020) << "current_desktop" << current_desktop;
 
     // Preload kded modules.
     const KService::List kdedModules = KServiceTypeTrader::self()->query("KDEDModule");
     for (int phase = 0; phase < 2; phase++) {
-        foreach (KService::Ptr service, kdedModules) {
+        foreach (const KService::Ptr service, kdedModules) {
             const int module_phase = phaseForModule(service);
             // Should the service be loaded in this phase or later?
             if (module_phase != phase) {
@@ -231,8 +243,6 @@ void Kded::initModules()
 
             // Should the service load on startup?
             const bool autoload = isModuleAutoloaded(service);
-
-            // see ksmserver's README for description of the phases
             bool prevent_autoload = false;
             switch( module_phase ) {
                 case 0: {
@@ -240,8 +250,17 @@ void Kded::initModules()
                     break;
                 }
                 case 1: {
-                    // autoload only in KDE
-                    if (!kde_running) {
+                    // autoload only in the current desktop?
+                    if (current_desktop.isEmpty()) {
+                        prevent_autoload = true;
+                        break;
+                    }
+
+                    if (!prevent_autoload && !allowedForDesktop(service, current_desktop)) {
+                        prevent_autoload = true;
+                    }
+
+                    if (!prevent_autoload && excludedForDesktop(service, current_desktop)) {
                         prevent_autoload = true;
                     }
                     break;

kutils/kmediaplayer/kded/kaudioplayer.desktop

@@ -9,4 +9,3 @@ X-KDE-DBus-ModuleName=kaudioplayer
 X-KDE-Kded-autoload=false
 X-KDE-Kded-load-on-demand=true
 X-KDE-MediaPlayer=kded_kaudioplayer
-OnlyShowIn=KDE;

kutils/knetworkmanager/kded/knetworkmanager.desktop

@@ -8,4 +8,3 @@ X-KDE-Library=knetworkmanager
 X-KDE-DBus-ModuleName=knetworkmanager
 X-KDE-Kded-autoload=true
 X-KDE-Kded-load-on-demand=true
-OnlyShowIn=KDE;

kutils/kpasswdstore/kded/kpasswdstore.desktop

@@ -9,4 +9,3 @@ X-KDE-DBus-ModuleName=kpasswdstore
 X-KDE-Kded-autoload=true
 X-KDE-Kded-load-on-demand=true
 X-KDE-Kded-phase=1
-OnlyShowIn=KDE;