enhancement: use the OLSR nameservice plugin to SIGHUP dnsmasq

[pmelange]

Currently there is a cron job which sendd a HUP to dnsmasq every 5 minutes. We do this so that we can add all the hostnames which are collected via the nameservice plugin for OLSR.

There is an option for the nameservice plugin to send a HUP directly to a PID stored in a pidfile. We can also set the "filewrite-interval" interval to something a bit longer than the default of 5 seconds (maybe 30 seconds)

The problem is that the name of the pid file is /var/run/dnsmasq/dnsmasq.[cfgNR].pid. Unfortunately the cfgNR is something cryptic like cfg01411c. If we give the dnsmasq section in /etc/config/dhcp a name (for example "freifunk") then the pidfile will have the name dnsmasq.freifunk.pid.

olsrd nameservice plugin documentation: https://github.com/OLSR/olsrd/blob/master/lib/nameservice/README_NAMESERVICE

So, what are your opinions? Would we like to have this enhancement? The changes would be:

• name the dnsmasq section in /etc/config/dhcp to "freifunk"
• add two PlParams to the nameservice plugin in /etc/config/olsr[6]
  • "sighup-pid-file" "/var/run/dnsmasq/dnsmasq.freifunk.pid"
  • "filewrite-interval" "30"
• remove the cron job

[SvenRoederer]

This is a issue which deals with the "2nd part" mentioned in freifunk-berlin/firmware-packages#91 (comment)