scrape retiolum's subnet list from syslog[-ng]

retiolum-subnet-list

#! /bin/sh
set -euf

tempfile=`tempfile`
trap "rm $tempfile" EXIT

inotail -n 0 -f /var/log/syslog.log |
sed -rn '
  /tinc\.retiolum/!b
  /.*: Subnet list:$/,/.*: End of subnet list\.$/{
    s/.*:  ([^:]*)$/\1/p
  }
  /.*: End of subnet list\.$/q
' >$tempfile &
that=$!

retiolum --kill=USR2
retiolum --kill=USR2 # yes, we have to do it twice--deal with it^_^

wait $that
sed -rn 's:^([0-9.]*)/32#10 owner ([a-z_]*)$:\1\t\2:p' $tempfile