Andrin Bertschi abertschi

Semantic Commit Messages

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

Example

How to use ssh-agent to cache your SSH credentials?

Contributed by Fabien Loudet, Linux SysAdmin at Rosetta Stone

Tired of always having to enter your SSH key passphrase when logging in to remote machines? Here comes ssh-agent. Enter the passphrase once and it will keep it in memory for you

Using ssh-agent in your shell session:

Install Wine

https://wiki.winehq.org/Download
Install other prerequisites
```
sudo apt install winbind winetricks
```

Benchmarking Nginx with Go

There are a lot of ways to serve a Go HTTP application. The best choices depend on each use case. Currently nginx looks to be the standard web server for every new project even though there are other great web servers as well. However, how much is the overhead of serving a Go application behind an nginx server? Do we need some nginx features (vhosts, load balancing, cache, etc) or can you serve directly from Go? If you need nginx, what is the fastest connection mechanism? This are the kind of questions I'm intended to answer here. The purpose of this benchmark is not to tell that Go is faster or slower than nginx. That would be stupid.

So, these are the different settings we are going to compare:

Go HTTP standalone (as the control group)
Nginx proxy to Go HTTP
Nginx fastcgi to Go TCP FastCGI
Nginx fastcgi to Go Unix Socket FastCGI

On Good Taste

Linus Torvalds in an interview talked about the idea of good taste in code or what I like to call elegance. As one might expect from two slides meant to make a point during a talk, he omits a lot of details to keep it short and simple. This post digs into the specifics of his example (deleting an element from a list) and adds another example (inserting an element in a list) including working code.

Example from Linus

This is an example of removing an element from a singly-linked list. It's one of the first data structures you learn about when you start learning about computer science and programming. The reason it doesn't show particularly good taste is because we have that condition at the end where we take a different action depending on whether the element we want to remove is at the beginning of the list or somewhere in the middle.

![Bad taste](http://

	obj-m := read_sysreg.o

	KDIR := /lib/modules/$(shell uname -r)/build
	PWD := $(shell pwd)

	all:
	$(MAKE) -C $(KDIR) M=$(PWD) modules

	clean:
	$(MAKE) -C $(KDIR) M=$(PWD) clean

	// Public Domain; Feel free to copy and steal it!
	// Based on:
	// http://fivelinesofcode.blogspot.de/2014/03/how-to-translate-virtual-to-physical.html

	#include <stdio.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <assert.h>
	#include <errno.h>
	#include <stdint.h>

	#include "log.h"

	unsigned char log_run_level = LOG_LVL_DEBUG;

	const char * log_level_strings [] = {
	"NONE", // 0
	"CRIT", // 1
	"WARN", // 2
	"NOTI", // 3
	" LOG", // 4

	#!/bin/sh
	# extend non-HiDPI external display on DP* above HiDPI internal display eDP*
	# see also https://wiki.archlinux.org/index.php/HiDPI
	# you may run into https://bugs.freedesktop.org/show_bug.cgi?id=39949
	# https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/883319

	EXT=`xrandr --current \| sed 's/^\(.\) connected.$/\1/p;d' \| grep -v ^eDP \| head -n 1`
	INT=`xrandr --current \| sed 's/^\(.\) connected.$/\1/p;d' \| grep -v ^DP \| head -n 1`

	ext_w=`xrandr \| sed 's/^'"${EXT}"' [^0-9]* \([0-9]\+\)x.*$/\1/p;d'`

	This file goes in /usr/lib/gnome-flashback/

	#! /bin/sh
	exec gnome-session --session=gnome-flashback-stumpwm --disable-acceleration-check "$@"