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Leandro Lisboa Penz lpenz

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lpenz /
Created Dec 23, 2020
Shell one-liner that installs an apt repository using ansible
ansible -c local localhost -m apt_repository -a "repo='deb buster main' update_cache=no"
lpenz /
Created Dec 1, 2020
Rust executable template
// Copyright (C) 2020 Leandro Lisboa Penz <>
// This file is subject to the terms and conditions defined in
// file 'LICENSE', which is part of this source code package.
use anyhow::Result;
fn main() -> Result<()> {
lpenz / chroot-with-mounts
Created Jan 26, 2020
chroot script that mounts /dev, /proc, etc. in a private mount namespace
View chroot-with-mounts
trap 'rm -f $TMP' EXIT
chmod u+x "$TMP"
set -e
lpenz / Vagrantfile-minikube
Created Mar 25, 2019
Vagrantfile that installs minkube in a VM and runs it there with vm-driver=none
View Vagrantfile-minikube
# -*- mode: ruby -*-
# vi: set ft=ruby :
# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
Vagrant.configure(VAGRANTFILE_API_VERSION) do |config| = "debian/stretch64"
# = "debian/buster64"
config.vm.provider "libvirt" do |v|
lpenz /
Last active Jan 24, 2019
Start steam in a nested X server running icewm
set -e -x
Xephyr "$DISPLAY_SESSION" -screen 1800x1000 &
trap 'kill "$PID_X"; wait "$PID_X"' EXIT
sleep 1
lpenz / SConstruct
Created Jan 20, 2019
SConstruct template with an action that renders jinja2 templates using data from an yaml file, while providing a markdown filter
View SConstruct
# SConstruct template with an action that renders jinja2 templates
# using data from an yaml file, while providing a markdown filter.
import yaml
import jinja2
import markdown
if False:
Environment = None
lpenz / Dockerfile
Created Oct 27, 2018
Dockerfile that creates a container that installs fluorite + electron locally
View Dockerfile
# You can use this Dockerfile to avoid having to install npm to
# get fluorine + electron installed locally.
# You still need node.js to run it, however.
# To use:
# docker build -t fluorine .
# docker run -it --rm -v $PWD:/home/user/work -e MY_UID=$UID fluorine
# The container will exit after fluorine + electron are set up; you can then
# remove the container with:
# docker rmi fluorine
# To run fluorine:
lpenz / minesweeper.hs
Created Nov 20, 2017
minesweeper kata in haskell, no output
View minesweeper.hs
import qualified Data.Map as Map
import Control.Monad
main :: IO ()
main = processOneField
processOneField :: IO ()
lpenz / nix-enter
Last active Mar 26, 2017
Enter a shell with ~/nix privately mounted in /nix, using mount namespaces. sudo required
View nix-enter
set -e -x
trap 'rm -f $TMP' EXIT
chmod u+x "$TMP"
cat > "$TMP" <<END
sudo mkdir /nix
lpenz / pa-monofy-stereo
Last active Mar 26, 2017
Join audio sink channels into a single mono channel, for stereo audio files with sound in only a channel
View pa-monofy-stereo
set -e -x
pacmd load-module module-remap-sink sink_name=mono master=$(pacmd list-sinks | grep -m 1 -oP 'name:\s<\K.*(?=>)') channels=2 channel_map=mono,mono