Dimitri Arrigoni SwagDevOps

How to change your commit messages in Git?

At some point you’ll find yourself in a situation where you need edit a commit message. That commit might already be pushed or not, be the most recent or burried below 10 other commits, but fear not, git has your back 🙂.

Not pushed + most recent commit:

git commit --amend

This will open your $EDITOR and let you change the message. Continue with your usual git push origin master.

Fix `a stop job is running for session c2 of user xxx (xs / 1min 30s)`

This advice is pointing to arch based distributions. Manjaro in special

Install watchdog

# pacman -S watchdog >

README

Services declared as oneshot are expected to take some action and exit immediatelly (thus, they are not really services, no running processes remain). A common pattern for these type of service is to be defined by a setup and a teardown action.

Let's create a example foo service that when started creates a file, and when stopped it deletes it.

Define setup/teardown actions

Create executable file /opt/foo/setup-foo.sh:

Debug your PHP in Docker with Intellij/PHPStorm and Xdebug

For your local dev, create a Dockerfile that is based on your production image and simply install xdebug into it. Exemple:

FROM php:5

RUN yes | pecl install xdebug \
&amp;&amp; echo "zend_extension=$(find /usr/local/lib/php/extensions/ -name xdebug.so)" &gt; /usr/local/etc/php/conf.d/xdebug.ini \

When should you use DateTime and when should you use Time?

It's a common misconception that [William Shakespeare][1] and [Miguel de Cervantes][2] died on the same day in history - so much so that UNESCO named April 23 as [World Book Day because of this fact][3]. However because England hadn't yet adopted [Gregorian Calendar Reform][4] (and wouldn't until [1752][5]) their deaths are actually 10 days apart. Since Ruby's Time class implements a [proleptic Gregorian calendar][6] and has no concept of calendar reform then there's no way to express this. This is where DateTime steps in:

>> shakespeare = DateTime.iso8601('1616-04-23', Date::ENGLAND)
=> Tue, 23 Apr 1616 00:00:00 +0000
>> cervantes = DateTime.iso8601('1616-04-23', Date::ITALY)
=> Sat, 23 Apr 1616 00:00:00 +0000

	[Unit]
	Description=Unbound is a validating, recursive, and caching DNS resolver.
	After=network.target networking.service

	[Service]
	Type=simple
	ExecStartPre=/usr/local/sbin/unbound-anchor -a /var/unbound/root.key
	ExecStartPre=/usr/local/sbin/unbound-checkconf
	ExecStart=/usr/local/sbin/unbound -d
	LimitNOFILE=102400

	require 'base64'
	require 'openssl'

	# Parse SSH keys to be used by OpenSSL lib
	# Taken from Zerg Support project.
	# See: https://github.com/pwnall/zerg_support/blob/faaa5dd140c95588a1db2a25f6c9d9cacb4f9b0a/lib/zerg_support/open_ssh.rb
	module OpenSSHKeyConverter
	# The components in a openssh .pub / known_host RSA public key.
	RSA_COMPONENTS = ['ssh-rsa', :e, :n]
	# The components in a openssh .pub / known_host DSA public key.

	hash = { 'foo' => 'bar' }

	# Version 1
	hash = Hash[hash.map { \|k, v\| [k.to_sym, v] }]

	# Version 2
	hash = hash.reduce({}) do \|memo, (k, v)\|
	memo.tap { \|m\| m[k.to_sym] = v }
	end

	def snake_case
	return downcase if match(/\A[A-Z]+\z/)
	gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2').
	gsub(/([a-z])([A-Z])/, '\1_\2').
	downcase
	end

	"FooBar".snake_case #=> "foo_bar"
	"HeadlineCNNNews".snake_case #=> "headline_cnn_news"
	"CNN".snake_case #=> "cnn"

	t = 236 # seconds
	Time.at(t).utc.strftime("%H:%M:%S")
	=> "00:03:56"

	# Reference
	# http://stackoverflow.com/questions/3963930/ruby-rails-how-to-convert-seconds-to-time