/usr/share/augeas/lenses/dist/hosts.aug is in augeas-lenses 1.2.0-0ubuntu1.
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 | (* Parsing /etc/hosts *)
module Hosts =
autoload xfm
let sep_tab = Util.del_ws_tab
let sep_spc = Util.del_ws_spc
let eol = Util.eol
let indent = Util.indent
let comment = Util.comment
let comment_or_eol = Util.comment_or_eol
let empty = [ del /[ \t]*#?[ \t]*\n/ "\n" ]
let word = /[^# \n\t]+/
let record = [ seq "host" . indent .
[ label "ipaddr" . store word ] . sep_tab .
[ label "canonical" . store word ] .
[ label "alias" . sep_spc . store word ]*
. comment_or_eol ]
let lns = ( empty | comment | record ) *
let xfm = transform lns (incl "/etc/hosts")
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