/usr/share/augeas/lenses/dist/rsyncd.aug is in augeas-lenses 1.10.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | (* Rsyncd module for Augeas
   Author: Marc Fournier <marc.fournier@camptocamp.com>
  Reference: man rsyncd.conf(5)
*)
module Rsyncd =
  autoload xfm
(************************************************************************
 * INI File settings
 *************************************************************************)
let comment    = IniFile.comment IniFile.comment_re "#"
let sep        = IniFile.sep IniFile.sep_re IniFile.sep_default
let indent     = del /[ \t]*/ "  "
(* Import useful INI File primitives *)
let eol        = IniFile.eol
let empty      = IniFile.empty
let sto_to_comment
               = Util.del_opt_ws " "
               . store /[^;# \t\n][^;#\n]*[^;# \t\n]|[^;# \t\n]/
(************************************************************************
 *                        ENTRY
 * rsyncd.conf allows indented entries, but by default entries outside
 * sections are unindented
 *************************************************************************)
let entry_re   = /[A-Za-z0-9_.-][A-Za-z0-9 _.-]*[A-Za-z0-9_.-]/
let entry      = IniFile.indented_entry entry_re sep comment
(************************************************************************
 *                        RECORD & TITLE
 * We use IniFile.title_label because there can be entries
 * outside of sections whose labels would conflict with section names
 *************************************************************************)
let title   = IniFile.indented_title ( IniFile.record_re - ".anon" )
let record  = IniFile.record title entry
let record_anon = [ label ".anon" . ( entry | empty )+ ]
(************************************************************************
 *                        LENS & FILTER
 * There can be entries before any section
 * IniFile.entry includes comment management, so we just pass entry to lns
 *************************************************************************)
let lns     = record_anon? . record*
let filter = (incl "/etc/rsyncd.conf")
let xfm = transform lns filter
 |