LayerShellPluginLoader.h

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// SPDX-FileCopyrightText: 2026 fuddlesworth
// SPDX-License-Identifier: LGPL-2.1-or-later
 
#pragma once
 
#include <QByteArray>
#include <QFile>
#include <QString>
 
namespace PhosphorWayland {
 
inline void registerLayerShellPlugin()
{
    if (qEnvironmentVariableIsEmpty("QT_WAYLAND_SHELL_INTEGRATION")) {
        // WAYLAND_DISPLAY proves a compositor is actually running. We do NOT fall
        // back to XDG_SESSION_TYPE because it can be "wayland" on systemd machines
        // even in SSH sessions or before the compositor starts, and XDG_RUNTIME_DIR
        // is always set on systemd — so that combination is too permissive.
        //
        // Also check XDG_RUNTIME_DIR/wayland-0 as a fallback: some compositors
        // (e.g. COSMIC) or systemd socket-activation setups may not set
        // WAYLAND_DISPLAY but the socket exists at the default path.
        if (!qEnvironmentVariableIsEmpty("WAYLAND_DISPLAY")) {
            qputenv("QT_WAYLAND_SHELL_INTEGRATION", "phosphorwayland");
        } else {
            // Fallback: check for common Wayland sockets. Compositors may use any
            // socket name (wayland-0, wayland-1 for nested sessions, or custom names).
            // We check the two most common defaults. COSMIC and some socket-activation
            // setups may not set WAYLAND_DISPLAY but the socket still exists.
            const QByteArray runtimeDir = qgetenv("XDG_RUNTIME_DIR");
            if (!runtimeDir.isEmpty()) {
                const QString runtimePath = QString::fromUtf8(runtimeDir);
                if (QFile::exists(runtimePath + QStringLiteral("/wayland-0"))
                    || QFile::exists(runtimePath + QStringLiteral("/wayland-1"))) {
                    qputenv("QT_WAYLAND_SHELL_INTEGRATION", "phosphorwayland");
                }
            }
        }
    }
}
 
} // namespace PhosphorWayland