Martin Vidner mvidner

D-Bus Crash Course: Part 1

Goal for this part: learn enough to call a method.

How to read this:

☡ A Knuth-style Dangerous Bend sign ☡ precedes parts that should be skipped at first.

What is D-Bus?

Massif Basics

Valgrind is an instrumentation framework that runs a program by simulating every instruction. It has several tools. Memcheck is the original one, used for detecting memory errors. Massif is a memory profiler.

(The output it produces, example: https://gist.github.com/mvidner/4e8ed01c7dabb648a50e0dd5f0fdcc62 )

The basic invocation of Massif is simple, valgrind --tool=massif my_program its_arguments, so for YaST

	str. heslo
	39 Analogie
	59 Bolzano
	205 Budoucí matematik
	214 Co je neznámá?
	87 Definice pojmu
	77 Dekompozice a rekombinace
	94 Descartes
	96 Diagnóza
	74 Důsledek

	#!/bin/sh
	# put this to .git/hooks/pre-commit and make it executable
	echo PRE-COMMIT HOOK:
	set -x
	# the repo Rust root is in a subdir
	# TODO: skip all of this if there are no changes in that dir
	cd rust
	# as seen in .github/workflows/ci-rust.yml
	cargo fmt --all -- --check

	#!/usr/bin/env ruby
	# The Rust httpmock crate,
	# https://docs.rs/httpmock/latest/httpmock/
	# in the 0.7.0 version, when it logs the request, it shows the body as
	# a numeric array of bytes.
	# Make it readable.

	# Input:

	# [2024-08-23T08:22:33Z DEBUG httpmock::server::web::handlers] Could not match any mock to the following request: HttpMockRequest {

	#!/bin/sh
	exec >> /var/log/YaST2/signal 2>&1
	# pstree -pluna; but let's use the long options for clarity
	pstree --show-pids --long --uid-changes --numeric-sort --arguments
	sleep 10

	#!/usr/bin/env ruby
	# frozen_string_literal: true
	require "dbus"

	# Complex property
	class Test < DBus::Object
	dbus_interface "net.vidner.Scratch" do
	dbus_attr_reader :progress, "(stttt)"
	end

	<?xml version="1.0"?>
	<productDefines xmlns="http://www.suse.com/1.0/yast2ns" xmlns:config="http://www.suse.com/1.0/configns">

	<!--
	Work around for the text domain
	textdomain="control"
	-->

	<textdomain>control</textdomain>

	#!/bin/sh
	# Automate the password setting step from
	# https://en.opensuse.org/Portal:MicroOS/Ignition
	#
	# 1. Ask for a password interactively.
	# 2. Make an ignition.iso for setting root's password to that.
	# An existing ignition.iso will be overwritten.
	#
	# Required commands
	# openssl