Sandro SuperSandro2000

Make Ubuntu packages 90% faster by rebuilding them

TL;DR

You can take the same source code package that Ubuntu uses to build jq, compile it again, and realize 90% better performance.

Setting

I use jq for processing GeoJSON files and other open data offered in JSON format. Today I am working with a 500MB GeoJSON file that contains the Alameda County Assessor's parcel map. I want to run a query that prints the city for every parcel worth more than a threshold amount. The program is

NOTE

by the time you're reading this, this probably no longer works since the policy has been removed. I reccomend you to check out https://github.com/r58Playz/uBlock-mv3 instead

How to keep using adblockers on chrome and chromium

google's manifest v3 has no analouge to the webRequestBlocking API, which is neccesary for (effective) adblockers to work
starting in chrome version 127, the transition to mv3 will start cutting off the use of mv2 extensions alltogether
this will inevitably piss of enterprises when their extensions don't work, so the ExtensionManifestV2Availability key was added and will presumably stay forever after enterprises complain enough

You can use this as a regular user, which will let you keep your mv2 extensions even after they're supposed to stop working

FAQ on the xz-utils backdoor (CVE-2024-3094)

This is a living document. Everything in this document is made in good faith of being accurate, but like I just said; we don't yet know everything about what's going on.

Update: I've disabled comments as of 2025-01-26 to avoid everyone having notifications for something a year on if someone wants to suggest a correction. Folks are free to email to suggest corrections still, of course.

Background

Install KOReader on a Tolino Device

Tolino Debug Menu codes

For KOReader (or any other APK) to be installed on a Tolino device, the debug menu has to be enabled:

if the tolino is on system version 14, search for code 124816 source
if the tolino is on system version 15, search for code 1123581321 source
if the tolino is on system version 16, search for code 112358132fb source

Note: "searching" as in the search for books on the tolino itself (the magnifying glass in the top bar)

	{
	description = "Krait eBPF mesh VPN";

	inputs = {
	nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
	flake-utils.url = "github:numtide/flake-utils";
	};

	outputs = { self, nixpkgs, flake-utils, ... }:
	flake-utils.lib.eachDefaultSystem (system:

	#!/usr/bin/env python3
	import http.client
	import json
	import os
	import time
	import urllib.parse
	import urllib.request
	from pathlib import Path
	from typing import Any

	{lib, ...}: {
	toBase64 = text: let
	inherit (lib) sublist mod stringToCharacters concatMapStrings;
	inherit (lib.strings) charToInt;
	inherit (builtins) substring foldl' genList elemAt length concatStringsSep stringLength;
	lookup = stringToCharacters "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	sliceN = size: list: n: sublist (n * size) size list;
	pows = [(64 * 64 * 64) (64 * 64) 64 1];
	intSextets = i: map (j: mod (i / j) 64) pows;
	compose = f: g: x: f (g x);

	{
	config,
	lib,
	...
	}: let
	cfg = config.services.freeipa-server;
	in {
	options.services.freeipa-server = {
	enable = lib.mkEnableOption "freeipa service";
	router = lib.mkOption {

	blueprint:
	name: Low Battery and Device Unavailable Check
	description: Regularly test all sensors with 'battery' device-class for crossing
	a certain battery level threshold as well as if it is unavailable.
	domain: automation
	input:
	threshold:
	name: Battery warning level threshold
	description: Battery sensors below threshold are assumed to be low-battery (as
	well as binary battery sensors with value 'on').

	{ pkgs, ... }:

	let
	readlink = "${pkgs.coreutils}/bin/readlink";
	notify-send = "${pkgs.libnotify}/bin/notify-send";
	in {
	systemd.user.services.detect-reboot-for-upgrade = {
	script = ''
	set -eu -o pipefail