Jérémie Huchet jeremiehuchet

HP DeskJet Pro 9600

In /etc/nixos/configuration.nix:

services.printing.enable = true;
services.printing.drivers = [ pkgs.hplip ];
services.printing.startWhenNeeded = true; # optional

users.users..extraGroups = [ ... "lp" ... ];

shelly-ha-mqtt-auto-discovery

A Shelly script to install on Shelly devices to publish MQTT announcement messages for Home Assistant.

![Example screenshot](https://gist.githubusercontent.com/jeremiehuchet/84e8dc96573e37200c2ab3bd4e013729/raw/793e171ba74eb5c3f39e5f58d18b648ba9b16659/screenshot.png

This note explain how to reduce a mounted filesystem on an LVM partition. It requires a reboot but most of the operations can be done online and the system can be used during the operations.

Remount filesystem read-only

sudo mount -f -o remount,ro /home

Snapshot the volume hosting the filesystem

sudo lvcreate -s data/home -L 30G -n home_resize
sudo lvdisplay data/home_resize

	// get the original destination for the socket when redirect by linux iptables
	// refer to https://raw.githubusercontent.com/missdeer/avege/master/src/inbound/redir/redir_iptables.go
	//
	const (
	SO_ORIGINAL_DST = 80
	IP6T_SO_ORIGINAL_DST = 80
	)

	func getOriginalDst(clientConn net.TCPConn) (rawaddr []byte, host string, newTCPConn net.TCPConn, err error) {
	if clientConn == nil {

	#!/bin/sh -e

	if [[ $# -ne 1 ]] ; then
	cat - <<HELP
	usage: $0 <gpg secret key id>

	Generates a printable PDF file <gpg secret key id>-backup.pdf for the given key id.
	HELP
	exit 1
	fi

	{ pkgs }:

	{
	# fetch docker image content and return path in nix store
	# inspired from https://github.com/NixOS/nixpkgs/blob/6dab1b50a63fa6e9dfb9bd9eddd3f5d5c7b055ef/pkgs/build-support/docker/default.nix#L264
	fetchDocker = coordinates:
	let
	name = "${coordinates.finalImageName}-${coordinates.finalImageTag}";
	result = pkgs.dockerTools.runWithOverlay {
	name = "docker-exporter-${name}";

	#!/bin/bash

	# setup wifi
	wpa_supplicant -B -i interface -c <(wpa_passphrase 'SSID' 'key')

	# partition disks
	# sda1 /boot
	# sda2 LVM PV
	# - vg hdd
	# - lv root

	#!/usr/bin/env bash
	set -e

	# see https://techdocs.akamai.com/iot-token-access-control/reference/generate-jwt-rsa-keys

	PRIVATE_KEY_PEM="$1"

	b64encode() {
	echo -n "$*" \| base64 -w 0 \| sed s/\+/-/ \| sed -E s/=+$//
	}