Phil Kauffman papamoose

version_cmp()

Simple function to (properly) compare version strings in bash

The problem

You can not do alphabetic comparison:

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

dmesg output when plugging in the usb serial cable:

[161312.500002] usb 3-2: new full-speed USB device number 3 using xhci_hcd
[161312.926854] usb 3-2: New USB device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00
[161312.926860] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[161312.926863] usb 3-2: Product: FT232R USB UART
[161312.926866] usb 3-2: Manufacturer: FTDI
[161312.926869] usb 3-2: SerialNumber: AC01PV6Q
[161312.966524] usbcore: registered new interface driver usbserial_generic
[161312.966534] usbserial: USB Serial support registered for generic

Add the following chunk to your existing ISC dhcpd.conf file.

if exists user-class and ( option user-class = "iPXE" ) {
    filename "http://boot.smidsrod.lan/boot.ipxe";
}
else {
    filename "undionly.kpxe";
}

(or see https://gist.github.com/4008017 for a more elaborate setup

Howto start using Letsencrypt with `simp_le`

What I had:

A Debian server at "mydomain.fi"
A self-signed certificate for Apache HTTPD, Postfix SMTPD and Dovecot IMAPD.

What I wanted:

A Letsencrypt certificate for Apache, Postfix and Dovecot
Simple tool for managing certificates that does need root privileges
Automatic renewal

	#!/bin/bash
	# This exists because I couldn't figure out to to make
	# any of the relevant system units wait for my zpool to become available
	# before importing it.
	#
	# zpool `tank` is a ThunderBay 6 connected via Thunderbolt 3.
	#
	# bolt.service -> ? -> zfs-import-cache
	# ? is possibly just time as it takes a bit for the drives to spin up.
	# The nvme pools work fine, for example.

	#!/usr/bin/env python3
	#
	# NOTE: This assumes that all modules and versions are built for at
	# least one kernel. If that's not the case, adapt parsing as needed.
	import os
	import subprocess

	# Permission check.
	if os.geteuid() != 0:
	print("You need to be root to run this script.")

	#!/usr/bin/python

	# For mojave only
	# In order for this to work, you will need to go to System Preferences in Mojave -> Security & Privacy -> Privacy -> Full Disk Access and grant Terminal.app permissions

	import sqlite3
	conn = sqlite3.connect('/var/db/SystemPolicyConfiguration/KextPolicy')
	c = conn.cursor()
	query = 'SELECT * FROM kext_policy'
	c.execute(query)

	#install gcc git build-essential python3
	$ sudo aptitude install gcc git build-essential python3

	#from http://www.pip-installer.org/en/latest/installing.html
	$ curl -O https://raw.github.com/pypa/virtualenv/master/virtualenv.py

	$ mkdir python3_prole
	$ cd python3_prole/
	$ python virtualenv.py -p /usr/bin/python3 env
	$ python virtualenv.py --relocatable -p /usr/bin/python3 env

	#!/usr/bin/env python

	"""
	Python functions for finding open files and PIDs that have opened a file.
	"""

	import numbers
	import subprocess

	try: