lucaswerkmeister

Make your Arch Linux device emit ownership information on boot

Scenario: You’ve lost your device. Actually Honest Achmed finds it, and would like to return it to you. However, the label that you had carefully attached to your device was ripped off. How does Achmed know who to return the device to? He attempts to boot the device, but since you use full-disk encryption (you do use full-disk encryption, don’t you?), that doesn’t get him any further than the decryption password prompt. Fortunately, you have arranged for a simple message to be printed before that prompt,

lucaswerkmeister

# /etc/systemd/system/opendmarc.service
[Unit]
Description=OpenDMARC email validation system
Documentation=man:opendmarc(8) man:opendmarc.conf(5) man:opendmarc-import(8) man:opendmarc-reports(8) http://www.trusteddomain.org/opendmarc/
After=network.target nss-lookup.target

[Service]
RuntimeDirectory=opendmarc
Type=forking
PIDFile=/run/opendmarc/opendmarc.pid

lucaswerkmeister

journalctl -u postfix -o json | jq -r 'select(.MESSAGE | contains("to=")) | .["_SOURCE_REALTIME_TIMESTAMP"]' | awk '{sec=int($1/(1000*1000)); print sec, int(sec/(60*60*24))}' | uniq -f 1 -c | sort -rn | head | while read count stamp day; do printf '%s\t%s\n' "$count" "$(date -Idate -d @$stamp)"; done

lucaswerkmeister

\documentclass{article}
\usepackage[utf8]{inputenc}

\DeclareUnicodeCharacter{3BB}{\lambda} % λ

\newcommand{\var}[1]{\mathtt{#1}}

\let\qm=?
\catcode`?=13
\def?{%

lucaswerkmeister

% colored underline, with Beamer overlay support                                                                                                                                                                                                                                                                                                                                                                                         
% usage: \cul{x} or \cul[blue]{x} or \cul<2->{x} or \cul<2->[blue]{x}                                                                                                                                                                                                                                                                                                                                                                    
\newcommand<>{\cul}[2][red]{%                                                                                                                                               

lucaswerkmeister

import ceylon.language.meta.model {
    ClassOrInterface
}

shared interface Enumeration<Element> of Element
        given Element satisfies Enumeration<Element> {
    shared static Element? byName(String name) {
        assert (is ClassOrInterface<Element> coi = `Element`);
        return coi.caseValues.find((element) => name == element.name);
    }

lucaswerkmeister

branch=... # the branch you want to turn into an orphan branch
base=master # the branch which $branch is based on and shouldn’t be anymore
firstCommit=... # the first commit on $branch that’s not on $base

# rename $branch to $branch-bak
git checkout $branch
git checkout -b $branch-bak
git branch -d $branch

# new orphan $branch

lucaswerkmeister

DataDirectory /var/lib/tor
#PidFile /var/run/tor/tor.pid
#RunAsDaemon 1
#User debian-tor

ControlSocket /var/run/tor/control
ControlSocketsGroupWritable 1

CookieAuthentication 1
CookieAuthFileGroupReadable 1

lucaswerkmeister

Ceylon TypeScript loader

[Original proposal][proposal]

The original goal was to finish the first iteration of the program, and to get as far as possible with the second iteration, including necessary changes to the compiler.

As explained in the proposal, both iterations produce a Ceylon module (i. e., modname/modver/modname-modver{,-model}.js{,.sha1} files) in a Ceylon module repository (e. g. modules/). This module can then be used like any other Ceylon module – moved between repositories, imported from a module descriptor, etc.

lucaswerkmeister

import java.lang { System { o=\iout, nanoTime }, Double, Long }

Integer additions = 10_000_000_000;
String format = "%04d. iteration, %8s: %04.1f seconds (%12d ns): %d\n";
Float seconds(Integer t1, Integer t2) => (t2 - t1) / 1.0e9;
Integer nanos(Integer t1, Integer t2) => t2 - t1;

class C() {
    @unboxed variable Integer i1 = 0;
    @boxed variable Integer i2 = 0;