Pivertise your Pi

README.md

How to Pivertise your Pi

You know how sometimes you connect your Raspberry Pi to a wifi network and then you have absolutely no way of finding out its IP address (Zeroes are particularly bad for this)? Well, I fixed it. Paste the run-once-at-boot-time systemd script into /etc/systemd/system/pivertiser.service and enable it with sudo systemctl enable pivertiser.service, paste the terrible bash hack into /home/pi/pivertiser.sh and chmod +x /home/pi/pivertiser.sh, then reboot your pi and it should show its face over here

Those addresses are stored in a hash keyed on hostname, so clearly if you never rename your pi from raspberrypi then this is an astonishingly terrible solution, but it's just solved a little problem for me. And you can of course run your own instance on Heroku if you want to

pivertise.sh

#!/bin/bash

sudo /sbin/ifconfig | grep wlan0

if [ ${?} == 0 ] ; then
  INTERFACE=wlan0
else
  INTERFACE=eth0
fi

curl https://pivertiser.herokuapp.com/`hostname`/`sudo /sbin/ifconfig ${INTERFACE} | grep 'inet addr' | tr -s ' ' ' ' | cut -d ' ' -f 3 | cut -d ':' -f 2`

pivertiser.service

[Unit]
Description = Advertise our IP
After       = network-online.target

[Service]
Type        = oneshot
ExecStart   = /home/pi/pivertise.sh

[Install]
WantedBy    = multi-user.target