def upload_etc():
    """
    Upload and render all templates in the woven/etc directory to the respective directories on the nodes
    
    Only configuration for installed packages will be uploaded where that package creates it's own subdirectory
    in /etc/ ie /etc/apache2.
    
    For configuration that falls in some other non package directories ie init.d, logrotate.d etc
    it is intended that this function only replace existing configuration files. To ensure we don't upload 
    etc files that are intended to accompany a particular package.
    """
    role = env.role_lookup[env.host_string]
    packages = env.packages[role]
    #determine the templatedir
    if env.verbosity:
        print "UPLOAD ETC configuration templates"
    if not hasattr(env, 'project_template_dir'):
        #the normal pattern would mean the shortest path is the main one.
        #its probably the last listed
        length = 1000
        env.project_template_dir = ''
        for dir in env.TEMPLATE_DIRS:
            if dir:
                len_dir = len(dir)
                if len_dir < length:
                    length = len_dir
                    env.project_template_dir = dir

    template_dir = os.path.join(os.path.split(os.path.realpath(__file__))[0],'templates','')
    default_templates = _get_template_files(template_dir)
    if env.project_template_dir: user_templates = _get_template_files(os.path.join(env.project_template_dir,''))
    else: user_templates = set([])
    etc_templates = user_templates | default_templates

    context = {'host_ip':socket.gethostbyname(env.host)}
    if env.overwrite or env.installed_packages[env.host]: mod_only = False
    else: mod_only = True
    for t in etc_templates:
        dest = t.replace('woven','',1)
        directory,filename = os.path.split(dest)
        package_name = filename.split('.')[0]
        if directory in ['/etc','/etc/init.d','/etc/init','/etc/logrotate.d','/etc/rsyslog.d']:
            #must be replacing an existing file
            if not exists(dest) and package_name not in packages: continue
        elif directory == '/etc/ufw/applications.d':
            #must be a package name
            if filename not in packages: continue
        elif not exists(directory, use_sudo=True): continue
        uploaded = upload_template(t,dest,context=context,use_sudo=True, modified_only=mod_only)
            
        if uploaded:
            sudo(' '.join(["chown root:root",dest]))
            if 'init.d' in dest: sudo(' '.join(["chmod ugo+rx",dest]))
            else: sudo(' '.join(["chmod ugo+r",dest]))
            if env.verbosity:
                print " * uploaded",dest