Nikolay Edigaryev edigaryev

git clone https://github.com/distribution/distribution.git
cd distribution
go run cmd/registry/main.go serve config.yml

Async/Await - The challenges besides syntax - Cancellation

This is the second article in a series of articles around Rusts new async/await feature. The first article about interfaces can be found here.

In this part of the series we want to a look at a mechanism which behaves very different in Rust than in all other languages which feature async/await support. This mechanism is Cancellation.

Problems with Go's shorthand declaration `:=`

The shadow variable trap

The problem

It is best illustrated with the following Go code snippet.

var x int

Using `<details>` in GitHub

Suppose you're opening an issue and there's a lot noisey logs that may be useful.

Rather than wrecking readability, wrap it in a <details> tag!

<details>
 Summary Goes Here

cloud-init is absolute cancer. Its code is horrible. It has no documentation at all.

It took me 5 fucking hours to figure out how to properly configure networking on recent cloud-init (Ubuntu 16.04 cloud image) with local datasource.

It's not mentioned anywhere you need to provide dsmode: local. (but only if you need network-config, besides that everything is fine; someone below noted that -m flag does the same thing, good to know) Of course nobody needs documentation for network-config format either. (cloudinit/net/__init__.py is a protip, enjoy the feces dive)

Oh, and by the way - no, it's not possible to provide network-config to uvt-kvm without patching shit.

Instructions how to install Debian using debootstrap. Below instructions were verified to work with debootstrapping Debian 11.

	[Interface]
	Address = <...>
	MTU = 1412
	PrivateKey = <...>
	DNS = <...>

	PostUp = iptables -t nat -A POSTROUTING -o %i -j MASQUERADE; iptables -A FORWARD -i %i -m state --state RELATED,ESTABLISHED -j ACCEPT; iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
	PostDown = iptables -t nat -D POSTROUTING -o %i -j MASQUERADE; iptables -D FORWARD -i %i -m state --state RELATED,ESTABLISHED -j ACCEPT; iptables -D FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

	[Peer]

	#!/bin/sh
	# The script configures simultaneous AP and Managed Mode Wifi on Raspberry Pi Zero W (should also work on Raspberry Pi 3)
	# Usage: curl https://gist.githubusercontent.com/lukicdarkoo/6b92d182d37d0a10400060d8344f86e4/raw \| sh -s WifiSSID WifiPass APSSID APPass
	# Licence: GPLv3
	# Author: Darko Lukic <[email protected]>
	# Special thanks to: https://albeec13.github.io/2017/09/26/raspberry-pi-zero-w-simultaneous-ap-and-managed-mode-wifi/

	MAC_ADDRESS="$(cat /sys/class/net/wlan0/address)"
	CLIENT_SSID="${1}"
	CLIENT_PASSPHRASE="${2}"

	Enable DCI debugging on Gigabyte-BKi5HA-7200
	--------------------------------------------

	The Gigabyte-BKi5HA-7200 (Kabylake i5-7200 processor) can be debugged with only a USB debug cable, a
	special cable that crosses only the data signals and has the power signals
	removed. You can buy these cables at i.e. https://www.datapro.net/products/usb-3-0-super-speed-a-a-debugging-cable.html
	The hurdle you have to overcome before you can access DCI however is that you
	need to set some bits in hardware that first enable DCI and also enable the debug port so that DCI can control the cores.
	There are lots of guides in howto patch the BIOS but only these two really describes all the steps using only freely accessible tools:


	George Carlin INVOICE
	[email protected]

	To: Invoice #6
	Stephen Hawking Date: May 13, 2014
	[email protected]

	+-----------------------------------------------------------------+
	\| Quantity \| Description \| Unit Price \| Total \|

Nikolay Edigaryev edigaryev

Async/Await - The challenges besides syntax - Cancellation

Problems with Go's shorthand declaration :=

The shadow variable trap

The problem

Using <details> in GitHub

Table of contents

Problems with Go's shorthand declaration `:=`

Using `<details>` in GitHub