Dave Jones waveform80

An extremely hacky, quickly thrown together script to extract various revisios of a specific Discourse post on discourse.ubuntu.com. Uses the "markdown diff" to extract the "current" revision and dumps them to individual markdown files

Does Discourse actually have an API for this? I couldn't find it...

ZMQEventLoop / SelectEventLoop "hang"

The following scripts can be used to reproduce the ZMQEventLoop (and the default SelectEventLoop) in urwid "hanging" when watched queues (or file descriptors) are ready but aren't serviced by their respective handlers.

The zmq_send.py and zmq_recv_1.py scripts can be run together to demonstrate a simple urwid application that receives messages from a SUB socket and displays them next to a clock. The zmq_recv_2.py script demonstrates what happens when the SUB socket is "ready" but isn't cleared by the handler; it's simply called repeatedly in preference to anything else. The display doesn't update unless draw_screen() is

From the original comment:

@Yoshqu there is a much simpler way to measure boot time to the usec, without having to use that custom bootloader

basically, ST_CLO begins counting at 1mhz, the instant the SoC comes out of reset and /proc/uptime begins counting seconds when linux starts up its internal clocks

the code in the gist, will then print both of them at once, and if you find the difference, youll see how long it took for linux to gain control of the core

U-Boot Environment Tools

A simple Python script for editing U-Boot environments. Should automatically detect the size of the U-Boot environment, and whether the "redundand" (sic) byte is included in it.

The script can be renamed (or linked) to "dump-env" for a simple tool to dump U-Boot environments too, or to "dot-env" for a tool that'll attempt to generate a Graphviz dot graph by parsing the U-Boot environment from $bootcmd (please note this last function is quite experimental, although I've found it useful in the past for figuring out the dependencies and execution paths of certain scripts).

Summary

edit-env env - Edit U-Boot environment env in the system editor

	{%- extends "basic/layout.html" %}
	{% block relbar1 %}{% endblock %}
	{% block relbar2 %}{% endblock %}
	{% block footer %}{% endblock %}
	{% block content %}
	<div id="content">
	<div class="header">
	<h1 class="heading"><span>{{ docstitle\|striptags\|e }}</span></h1>
	</div>
	<div class="relnav" role="navigation">

	#!/usr/bin/python3

	import io
	import re
	import datetime as dt
	from subprocess import run, PIPE
	from itertools import chain

	def cloud_init_log():
	with io.open('/var/log/cloud-init.log', 'r', encoding='utf-8') as log:

	# Build with dot -Tpng ubuntu-classic-boot.dot \| display png:-

	digraph G {
	graph [rankdir=TB];
	node [fontsize=10, fontname="Arial"];
	edge [fontsize=10, fontname="Arial"];

	/* files */
	node [shape=rect, style=filled, fillcolor="#7ec2cc", penwidth=0];
	bootcode_bin [label="/boot/bootcode.bin"];

	#!/bin/bash

	# Derived from https://unix.stackexchange.com/a/311680/295309

	if [[ $# -lt 1 ]]; then
	echo "Usage:"
	echo " $0 <serial-port> [ <speed> [ <stty-options> ...] ]"
	echo " Example: $0 /dev/ttyS0 115200"
	echo " Use ^Q to quit"
	exit 1

	# On the host
	=============

	lxc config set openvpn raw.lxc 'lxc.cgroup.devices.allow = c 10:200 rwm'
	lxc config device add openvpn tun unix-char path=/dev/net/tun

	# In the container
	==================

	1. mknod /dev/net/tun c 10 200

	#!/usr/bin/python3

	import os
	import stat
	import zipfile
	import tarfile

	def scan(path):
	for dirpath, dirnames, filenames in os.walk(path):
	for filename in filenames: