python required_distro_layers_handler() {
    import os
    import bb

    required_layers = (d.getVar('REQUIRED_LAYERS') or "").split()
    if not required_layers:
        return

    bblayers_conf = os.path.join(d.getVar('TOPDIR'), 'conf/bblayers.conf')
    if not os.path.exists(bblayers_conf):
        return

    # Aktuelle BBLAYERS auslesen
    bblayers = d.getVar('BBLAYERS') or ""
    
    # Pfad zu den Layern bestimmen
    layers_dir = os.path.abspath(os.path.join(d.getVar('TOPDIR'), '..', 'layers'))
    
    # Layer hinzufügen, die noch nicht in BBLAYERS enthalten sind
    for layer in required_layers:
        layer_path = os.path.join(layers_dir, layer)
        if layer_path not in bblayers:
            bb.note("Adding required layer: %s" % layer_path)
            d.appendVar('BBLAYERS', " " + layer_path)
            
    # BBLAYERS in die Konfigurationsdatei schreiben
    with open(bblayers_conf, 'r') as f:
        content = f.read()
    
    # Einfach einen Hinweis hinzufügen, damit keine versehentlichen Änderungen vorgenommen werden
    marker = '# Required layers added by openstlinux-eglfs-dcm distro'
    if marker not in content:
        with open(bblayers_conf, 'a') as f:
            f.write('\n' + marker + '\n')
            for layer in required_layers:
                layer_path = os.path.join(layers_dir, layer)
                if layer_path not in content:
                    f.write('BBLAYERS =+ "%s"\n' % layer_path)
}

addhandler required_distro_layers_handler
required_distro_layers_handler[eventmask] = "bb.event.ConfigParsed"