Taras Kalapun xslim

Installing cloud-init on a fresh Raspbian Lite image

This is a work in Progress!

Purpose

This mainly demonstrates my goal of preparing a Raspberry Pi to be provisioned prior to its first boot. To do this I have chosen to use the same cloud-init that is the standard for provisioning servers at Amazon EC2, Microsoft Azure, OpenStack, etc.

I found this to be quite challenging because there is little information available for using cloud-init without a cloud. So, this project also servers as a demonstration for anyone on any version of Linux who may want to install from source, and/or use without a cloud. If you fall into that later group, you probably just want to read the code. It's bash so everything I do, you could also do at the command line. (Even the for loop.)

Preface

I owe my very rapid learning journey in the world of ConfigFs to several key sources which aren't necessarily relevant to this result, but I feel deserve a mention anyway.

This really demystified configfs for me, and stopped me being afraid of it: http://events.linuxfoundation.org/sites/events/files/slides/USB%20Gadget%20Configfs%20API_0.pdf
I borrowed heavily from this Mindstorms EV3 script: https://github.com/ev3dev/ev3-systemd/blob/ev3dev-jessie/scripts/ev3-usb.sh
Desperately trawled this thread for answers: https://answers.microsoft.com/en-us/windows/forum/windows_10-networking-winpc/windows-10-vs-remote-ndis-ethernet-usbgadget-not/cb30520a-753c-4219-b908-ad3d45590447?auth=1
This guide is handy: http://irq5.io/2016/12/22/raspberry-pi-zero-as-multiple-usb-gadgets/

YubiKey 4 series GPG and SSH setup guide

Written for fairly adept technical users, preferably of Debian GNU/Linux, not for absolute beginners.

You'll probably be working with a single smartcard, so you'll want only one primary key (1. Sign & Certify) and two associated subkeys (2. Encrypt, 3. Authenticate). I've published a Bash function which automates this slightly special key generation process.

	#!/bin/bash

	# Before running this script, make sure you have sysbench installed:
	# sudo apt-get install sysbench
	#
	# This script helps you check if your Raspberry pi is correctly powered.
	# You can read more about Raspberry pi powering issues here: https://ownyourbits.com/2019/02/02/whats-wrong-with-the-raspberry-pi/


	# If you're pi is correctly powered (stable power supply and quality cable), after running the script, you should get something like:

	# define our method
	def replace_all(text, dic):
	for i, j in dic.iteritems():
	text = text.replace(i, j)
	return text

	navtex = 'navtex string here'

	# our dictionary with our key:values.
	dic = {'BACK':'Backing','KMH':'Km/h','QUAD':'Quadrant','BECMG':'Becoming','KT':'Knots','RPDY':'Rapidly','BLDN':'Building','LAT/LONG':'Latitude/Longitude','SCT':'Scattered','C-FRONT':'Cold front','LOC':'Locally','SEV':'Severe','SVR':'Severe','DECR':'Decreasing','M':'Metres','SHWRS':'Showeres','SH':'showers','DPN':'Deepening','MET':'Meteo','SIG':'Significant','EXP':'Expected,''MOD':'Moderate','SLGT':'slight','SLT':'Slight','FCST':'Forecsat','MOV':'moving/move','MVG':'Moving/Move','SLWY':'Slowly','FLN':'Filling','NC':'No change','STNR':'Stationary','FLW':'Following','NM':'Nautical miles','STRG':'Strong','FM':'From','NOSIG':'No significant change','TEMPO':'Temporarily/Temporary','FRQ':'Frequent/frequency','NXT':'Next','TEND':'Further Outlooks','HPA':'HectoPascal','OCNL':'Ocasionally','VEER':'Veering','HVY':'Heavy'

	Interface Specification for NASA Marine PC Navtex Pro

	1 - Electronic Interface

	Power input: +10Volts to + 16Volts.
	RS232 interface:
	data format: 8 bits, 1 start bit, no parity, 1 stop bit.
	Connector: 9-pin D-type socket mounted on the board.
	pin 2: 38,400 Baud output from Engine to PC
	pin 3: 38,400 Baud input to Engine from PC


	#DietPi setup script for RTL-SDR/Multimon-ng/Pagermon for decoding pager messages(FLEX/POCSAG etc.)

	cat <<EOF >no-rtl.conf
	blacklist dvb_usb_rtl28xxu
	blacklist rtl2832
	blacklist rtl2830
	EOF

	mv no-rtl.conf /etc/modprobe.d/

	let elliptic = require('elliptic');
	let sha3 = require('js-sha3');
	let ec = new elliptic.ec('secp256k1');

	// let keyPair = ec.genKeyPair();
	let keyPair = ec.keyFromPrivate("97ddae0f3a25b92268175400149d65d6887b9cefaf28ea2c078e05cdc15a3c0a");
	let privKey = keyPair.getPrivate("hex");
	let pubKey = keyPair.getPublic();
	console.log(`Private key: ${privKey}`);
	console.log("Public key :", pubKey.encode("hex").substr(2));

	#!/bin/bash

	level=$1
	#echo "level given is $level"

	if [ $# != 1 ]; then
	echo "USAGE: $0 brightness_level (0 to 255)"
	exit 1
	fi

	#!/usr/bin/python

	import RPi.GPIO as GPIO
	import time
	import subprocess, os
	import signal
	GPIO.setmode(GPIO.BCM)
	GPIO.setwarnings(False)
	RearView_Switch = 14 # pin 18
	Brightness_Switch = 15 # pin 16