todgru

Managing Python using pyenv, virtualenv, and pyenv-virtualenv

Problem: You want to maintain multiple different versions of python and keep packages separated based on projects that you're working on.

Solution: Use the pyenv, virtualenv tools along with the pyenv-virutalenv plugin to manage multiple versions of python and seamlessly integrate them with your projects' virtual environments.

Installation

Exporting your 2FA tokens from Authy to transfer them into another 2FA application

IMPORTANT - Update regarding deprecation of Authy desktop apps

Past August 2024, Authy stopped supported the desktop version of their apps:
See Authy is shutting down its desktop app | The 2FA app Authy will only be available on Android and iOS starting in August for details.

And indeed, after a while, Authy changed something in their backend which now prevents the old desktop app from logging in. If you are already logged in, then you are in luck, and you can follow the instructions below to export your tokens.

If you are not logged in anymore, but can find a backup of the necessary files, then restore those files, and re-install Authy 2.2.3 following the instructions below, and it should work as expected.

`TypeError: Cannot read property 'getTableName' of undefined` or `foo.bar is not a function`

I've had this error on numerous occasions. Here are a few things to look for:

Check that the table name that is included in the query is spelled correctly, check that is it defined correctly (for sequelize).
If you are running tests and using Mockery, check that Mockery is setup correctly. Try removing Mockery and running the test.
Check that if you are trying to stub with Sinon, that Mockery isn't ALSO trying to stub out the same object.
Example of stubbing with Sinon instead of Mockery: https://gist.github.com/todgru/e439373af2488eefc30ae8bd1fe3864a

Simple automated GIT Deployment using GIT Hooks

Here are the simple steps needed to create a deployment from your local GIT repository to a server based on this in-depth tutorial.

How it works

You are developing in a working-copy on your local machine, lets say on the master branch. Most of the time, people would push code to a remote server like github.com or gitlab.com and pull or export it to a production server. Or you use a service like deepl.io to act upon a Web-Hook that's triggered that service.

Setup fail2ban (v0.8.11) with ufw and nginx on Ubuntu 14.04

Install fail2ban & ufw

If you haven't already, install fail2ban and ufw:

sudo apt-get install fail2ban ufw

Now make a copy of the fail2ban configuration, and name it jail.local:

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.

	#!/usr/bin/env bash

	INI_FILE=~/.aws/credentials

	while IFS=' = ' read key value
	do
	if [[ $key == \[*] ]]; then
	section=$key
	elif [[ $value ]] && [[ $section == '[default]' ]]; then
	if [[ $key == 'aws_access_key_id' ]]; then

	// Sometimes I have a promise chain that returns out of a promise before
	// the the execution is actually completed. Maybe i'm not returning correctly?
	// Anyway, might be a common problem for a newb, like me.
	// here is a way to add a delay in the promise chain to wait for the previous
	// promise to complete. This is NOT best practice, but maybe it can be used as
	// a troubleshooting tool.
	//
	...
	.then(() => {...})
	.then(() => {

	const readline = require('readline')
	const blank = '\n'.repeat(process.stdout.rows)
	console.log(blank)
	readline.cursorTo(process.stdout, 0, 0)
	readline.clearScreenDown(process.stdout)

	sudo service bluetooth status # Verify bluetooth is active.
	sudo bluetoothctl # Lauch bluetooth subshell.
	agent on # [No idea what this does.]
	default-agent # [No idea what this does.]
	scan on # Displays a list of available devices.
	pair XX:XX:XX:XX:XX:XX # This prepares a potential connection, the X's represent your device ID
	# A "PIN code" will be displayed, type it on the keyboard and press "enter".
	trust XX:XX:XX:XX:XX:XX # Adds device to trusted devices, this survives reboot.
	connect XX:XX:XX:XX:XX:XX # Connect to the device now.
	exit # Return to previous shell.