Jens Kristian Villadsen jkiddo

Install Golang 1.9:

wget https://storage.googleapis.com/golang/go1.9.linux-armv6l.tar.gz
sudo tar -C /usr/local -xzf go1.9.linux-armv6l.tar.gz
export PATH=$PATH:/usr/local/go/bin # put into ~/.profile

If already installed old golang with apt-get:

The repository for the assignment is public and Github does not allow the creation of private forks for public repositories.

The correct way of creating a private frok by duplicating the repo is documented here.

For this assignment the commands are:

Create a bare clone of the repository. (This is temporary and will be removed so just do it wherever.)

git clone --bare [email protected]:usi-systems/easytrace.git

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

General rules

Follow standard conventions.
Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
Boy scout rule. Leave the campground cleaner than you found it.
Always find root cause. Always look for the root cause of a problem.

Design rules

Raspberry Pi with OSMC and shairport-sync

It is assumed that OSMC is installed and running on the Raspberry, and the Airport service should be disabled (though it doesn't have to be, but who needs two Airplay services). OSMC is based on Debian 8 (Jessie).

If you get Error opening terminal when opening nano or alsamixer, update the current TERM:

export TERM=xterm

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

Problem

I have two Github accounts: oanhnn (personal) and superman (for work). I want to use both accounts on same computer (without typing password everytime, when doing git push or pull).

Solution

Use ssh keys and define host aliases in ssh config file (each alias for an account).

How to?

Generate ssh key pairs for accounts and add them to GitHub accounts.

Hacking the SamKnows Whitebox

The SamKnows Whitebox is a free router (TP-Link TL-WDR3600) provided by SamKnows to gather internet speed statistics. Ok that's great, but any person with a small amount of hacker's spirit will want to hack it to install some custom firmware to take advantage of the two gigantic antennas on the back, the USB ports and everything else.

Step 1 : Debug mode

Root access can be obtained via a "debug mode" on the router giving you a direct root shell via telnet, amazingly simple.

Disconnect the Whitebox from the internet.
Connect your computer directly to the Whitebox via Ethernet to one of the four ethernet ports on the Whitebox.
Configure your computer's IP settings to "Manual" setting the computer's IP address to 192.168.1.2, the Subnet Mask to 255.255.255.0 and the Gateway to 192.168.1.1.
Turn off the Whitebox.

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

Maven + Google Play Services

The recently released version of Google Play Services presents itself as a library project with string and attribute resources coupled with a .jar in the libs/ folder that has been compiled against internal APIs.

While this is convenient for users of IDEs or Ant, it presents a problem for those using proper build systems (e.g., Maven, Gradle) with dependency management. Inside the .jar there are a lot of classes which reference static attributes on the com.google.android.gsm.R class. This means that

	#!groovy
	import groovy.json.JsonOutput
	import groovy.json.JsonSlurper

	def label = "mypod-${UUID.randomUUID().toString()}"
	podTemplate(label: label, yaml: """
	spec:
	containers:
	- name: mvn
	image: maven:3.3.9-jdk-8