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How-To:

1. Install BerryBoot and add your desired images.
2. Install Raspbian Lite (~300 mb) and set it as the default OS to boot.
3. Use raspi-config to setup networking if needed and auto-login of the user pi.
4. Install pip, sh, and pyftpdlib, for python
5. Adjust at least the FTP values of boot_selector_config.py.
6. Transfer the Python files to Raspbian Lite. (Boot_selector.py etc.)
7. Append the following to the end of /home/pi/.bashrc:

#Adjust the dirs accordingly.
sudo python /home/pi/ftp_server.py && sleep 2s &
sudo python /home/pi/boot_selector.py

8. Make sure the switch is not connected for the first run in order to generate the required filenames. Use the command: source ~/.bashrc. You should now have a working FTP server and a text file in the same directory named images.log.
9. Adjust boot_selector_config.py with the right filenames from images.log and the GPIO you wish to use for the switch.

When everything is set up. Upon rebooting, the ftp server starts. The images.log file is produced. If the switch IS connected, the system will begin a countdown timer and reboot to the image that you have designated in the config file for the corresponding GPIO. If the switch is NOT connected, the system will not reboot, allowing you to connect via FTP to adjust the config file as needed.