Advance Wayland and KDE package bring-up

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/recipes/kde/kf6-kdbusaddons/source/src/kupdatelaunchenvironmentjob.cpp

@@ -0,0 +1,158 @@
+/*
+    SPDX-FileCopyrightText: 2020 Kai Uwe Broulik <kde@broulik.de>
+    SPDX-FileCopyrightText: 2021 David Edmundson <davidedmundson@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "kupdatelaunchenvironmentjob.h"
+
+#include <QDBusArgument>
+#include <QDBusConnection>
+#include <QDBusMetaType>
+#include <QDBusPendingReply>
+
+#include <QTimer>
+
+#include "kdbusaddons_debug.h"
+
+class KUpdateLaunchEnvironmentJobPrivate
+{
+public:
+    explicit KUpdateLaunchEnvironmentJobPrivate(KUpdateLaunchEnvironmentJob *q);
+    void monitorReply(const QDBusPendingReply<> &reply);
+
+    static bool isPosixName(const QString &name);
+    static bool isSystemdApprovedValue(const QString &value);
+
+    KUpdateLaunchEnvironmentJob *q;
+    QProcessEnvironment environment;
+    int pendingReplies = 0;
+};
+
+KUpdateLaunchEnvironmentJobPrivate::KUpdateLaunchEnvironmentJobPrivate(KUpdateLaunchEnvironmentJob *q)
+    : q(q)
+{
+}
+
+void KUpdateLaunchEnvironmentJobPrivate::monitorReply(const QDBusPendingReply<> &reply)
+{
+    ++pendingReplies;
+
+    auto *watcher = new QDBusPendingCallWatcher(reply, q);
+    QObject::connect(watcher, &QDBusPendingCallWatcher::finished, q, [this](QDBusPendingCallWatcher *watcher) {
+        watcher->deleteLater();
+        --pendingReplies;
+
+        if (pendingReplies == 0) {
+            Q_EMIT q->finished();
+            q->deleteLater();
+        }
+    });
+}
+
+KUpdateLaunchEnvironmentJob::KUpdateLaunchEnvironmentJob(const QProcessEnvironment &environment)
+    : d(new KUpdateLaunchEnvironmentJobPrivate(this))
+{
+    d->environment = environment;
+    QTimer::singleShot(0, this, &KUpdateLaunchEnvironmentJob::start);
+}
+
+KUpdateLaunchEnvironmentJob::~KUpdateLaunchEnvironmentJob() = default;
+
+void KUpdateLaunchEnvironmentJob::start()
+{
+    qDBusRegisterMetaType<QMap<QString, QString>>();
+    QMap<QString, QString> dbusActivationEnv;
+    QStringList systemdUpdates;
+
+    for (const auto &varName : d->environment.keys()) {
+        if (!KUpdateLaunchEnvironmentJobPrivate::isPosixName(varName)) {
+            qCWarning(KDBUSADDONS_LOG) << "Skipping syncing of environment variable " << varName << "as name contains unsupported characters";
+            continue;
+        }
+        const QString value = d->environment.value(varName);
+
+        // plasma-session
+        QDBusMessage plasmaSessionMsg = QDBusMessage::createMethodCall(QStringLiteral("org.kde.Startup"),
+                                                                       QStringLiteral("/Startup"),
+                                                                       QStringLiteral("org.kde.Startup"),
+                                                                       QStringLiteral("updateLaunchEnv"));
+        plasmaSessionMsg.setArguments({QVariant::fromValue(varName), QVariant::fromValue(value)});
+        auto plasmaSessionReply = QDBusConnection::sessionBus().asyncCall(plasmaSessionMsg);
+        d->monitorReply(plasmaSessionReply);
+
+        // DBus-activation environment
+        dbusActivationEnv.insert(varName, value);
+
+        // _user_ systemd env
+        // Systemd has stricter parsing of valid environment variables
+        // https://github.com/systemd/systemd/issues/16704
+        // validate here
+        if (!KUpdateLaunchEnvironmentJobPrivate::isSystemdApprovedValue(value)) {
+            qCWarning(KDBUSADDONS_LOG) << "Skipping syncing of environment variable " << varName << "as value contains unsupported characters";
+            continue;
+        }
+        const QString updateString = varName + QStringLiteral("=") + value;
+        systemdUpdates.append(updateString);
+    }
+
+    // DBus-activation environment
+    QDBusMessage dbusActivationMsg = QDBusMessage::createMethodCall(QStringLiteral("org.freedesktop.DBus"),
+                                                                    QStringLiteral("/org/freedesktop/DBus"),
+                                                                    QStringLiteral("org.freedesktop.DBus"),
+                                                                    QStringLiteral("UpdateActivationEnvironment"));
+    dbusActivationMsg.setArguments({QVariant::fromValue(dbusActivationEnv)});
+
+    auto dbusActivationReply = QDBusConnection::sessionBus().asyncCall(dbusActivationMsg);
+    d->monitorReply(dbusActivationReply);
+
+    // _user_ systemd env
+    QDBusMessage systemdActivationMsg = QDBusMessage::createMethodCall(QStringLiteral("org.freedesktop.systemd1"),
+                                                                       QStringLiteral("/org/freedesktop/systemd1"),
+                                                                       QStringLiteral("org.freedesktop.systemd1.Manager"),
+                                                                       QStringLiteral("SetEnvironment"));
+    systemdActivationMsg.setArguments({systemdUpdates});
+
+    auto systemdActivationReply = QDBusConnection::sessionBus().asyncCall(systemdActivationMsg);
+    d->monitorReply(systemdActivationReply);
+}
+
+bool KUpdateLaunchEnvironmentJobPrivate::isPosixName(const QString &name)
+{
+    // Posix says characters like % should be 'tolerated', but it gives issues in practice.
+    // https://bugzilla.redhat.com/show_bug.cgi?id=1754395
+    // https://bugzilla.redhat.com/show_bug.cgi?id=1879216
+    // Ensure systemd compat by only allowing alphanumerics and _ in names.
+    bool first = true;
+    for (const QChar c : name) {
+        if (first && !c.isLetter() && c != QLatin1Char('_')) {
+            return false;
+        } else if (first) {
+            first = false;
+        } else if (!c.isLetterOrNumber() && c != QLatin1Char('_')) {
+            return false;
+        }
+    }
+    return !first;
+}
+
+bool KUpdateLaunchEnvironmentJobPrivate::isSystemdApprovedValue(const QString &value)
+{
+    // systemd code checks that a value contains no control characters except \n \t
+    // effectively copied from systemd's string_has_cc
+    for (const char &it : value.toLatin1()) {
+        if (it == QLatin1Char('\n') || it == QLatin1Char('\t')) {
+            continue;
+        }
+        if (it > 0 && it < ' ') {
+            return false;
+        }
+        if (it == 127) {
+            return false;
+        }
+    }
+    return true;
+}
+
+#include "moc_kupdatelaunchenvironmentjob.cpp"