Nick Guenther kousu

The Galaxy Tab E is an unsupported and somewhat dated device now, but there are a lot of them in the world and they have a nice screen that's comfortable for reading or watching shows. Here is how to keep one alive, if you have it, by updating its OS to 2025. Credit for the build goes to @retiredtab (https://sourceforge.net/projects/retiredtab/). Google(?) is no longer doing firmware security updates, and so @retiredtab has decided this is the last build they are going to make, so there will be no more updates unless someone else picks maintenance up. Do not put any sensitive data on this device, but it makes a good e-book reader or youtube/Netflix viewer.

This guide assumes you have a desktop machine with Linux and ~1GB of free space.

Verify model

Look at Tablet > Settings > About Tablet > model. Verify it says SM-T560NU.

Cloud-reduced Markdown Wiki (WIP)

This is a way to write and share notes for yourself between multiple devices, without signing up for locked-in cloud services

Install

(Android) phone:

Diary.apk

Just because the docs on https://github.com/42wim/matterbridge/wiki/ are a little bit obscure in some parts, here's a complete record of what I did:

sudo pacman -S matterbridge
Set up a generic systemd service file:

$ cat /etc/systemd/system/matterbridge\@.service 
[Unit]
Description=%I Chat Bridge
After=network-online.target

I've found a confusing behaviour in Linux's version of du(1). du can take a single folder to recurse into, or list of files/folders either via --files0-from or in argv. But its behaviour is inconsistent if this list contains parents and children.

A child given before its parent makes the parent count as empty
With -s (or equivalently -d 0), a parent given before its child (vice versa) skips the child

OpenBSD's du conversely has consistent behaviour: it always outputs one line (or block of lines, if not given -s) per input, and always counts everything as full-sized, parent and child.

This is a wrapper around docker exec that makes sure to set up a matching user; it also has a pre-script hook. It's kind of janky but it was useful.

It's a lot like Microsoft's `wsl -- command'

Originally written as part of https://github.com/neuropoly/spinalcordtoolbox/blob/916ab591ca2e35cab9f5f27ec2439ce8fdb0b9d2/util/dockerize.sh but that project migrated to Github Actions.

We used it like this:

# if this is a docker job, run in the container instead; but if not just run it here.

Extract an indented block from a file, starting from a given header line.

Usage: extract.awk HEADER file

e.g.

$ ./extract.awk a t
   a() {

	#!/usr/bin/env python

	# this is a tiny little clone of `nc -U -l path`
	# but it creates the socket after chdir()ing in a subprocess to avoid ENAMETOOLONG:
	#
	# To test the difference, get openbsd-netcat and run:
	#
	# mkdir -p /tmp/abcdefhijklmnopqrstuvwxyz/abcdefhijklmnopqrstuvwxyz/abcdefhijklmnopqrstuvwxyz/abcdefhijklmnopqrstuvwxyz
	# nc -v -U -l /tmp/abcdefhijklmnopqrstuvwxyz/abcdefhijklmnopqrstuvwxyz/abcdefhijklmnopqrstuvwxyz/abcdefhijklmnopqrstuvwxyz/ipc.sock
	#

	#!/usr/bin/env python3
	#
	# The missing 'pip integrity' command.
	#
	# This verifies the correctness of an unpacked pip package
	# by examining the file hashes in the 'RECORD' file.
	# spec at https://peps.python.org/pep-0427/#the-dist-info-directory

	import sys
	import base64

	<?xml version='1.0' encoding='utf-8'?>
	<MixxxControllerPreset schemaVersion="1" mixxxVersion="2.3.0">
	<info>
	<name>Akai MPK Mini</name>
	</info>
	<controller id="AkaiMPKMini">
	<scriptfiles/>
	<controls>

	<!-- Master -->