/usr/share/augeas/lenses/dist/hosts.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 | (* Parsing /etc/hosts *)
module Hosts =
autoload xfm
let word = /[^# \n\t]+/
let record = [ seq "host" . Util.indent .
[ label "ipaddr" . store word ] . Sep.tab .
[ label "canonical" . store word ] .
[ label "alias" . Sep.space . store word ]*
. Util.comment_or_eol ]
let lns = ( Util.empty | Util.comment | record ) *
let xfm = transform lns (incl "/etc/hosts")
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