Posts on yet another blog

gitlab-ci

Wed, 16 Apr 2025 00:00:00 +0000

gitlab-ci

If this post is online, my new gitlab-ci pipeline is working. With podman instead of docker.

Here I collect some of the settings/commands from setup (not complete, without guarantee)

install gitlab runner:

curl -L "https://packages.gitlab.com/install/repositories/runner/gitlab-runner/script.deb.sh" | sudo bash
sudo apt install gitlab-runner

then register it:

gitlab-runner register --url <GITLAB_URL> --token <GITLAB_RUNNER_TOKEN>

create the GITLAB_RUNNER_TOKEN at <GITLAB_URL>/admin/runners/new

configure the runner: edit /etc/gitlab-runner/config.toml:

[[runners]]
  [runners.docker]
    host = "unix:///run/user/996/podman/podman.sock"

Then enable the podman socket on the host

kurzlist.de

Fri, 20 May 2022 00:00:00 +0000

I’m trying to use my domain kurzlist.de for something useful.

As a start I collect useful links all around C++.

same blog, different look

Fri, 20 May 2022 00:00:00 +0000

relaunch 2023

I switched the blog generator from jekyll to hugo.

With jekyll I had often the problem of outdated gem version, incompatible compiled-gems and even ruby updates.

The installation of hugo is simple: install it pacman -S hugo :)

Both have a similar directory structure, both support markdown for posts/pages. And I don’t care if the config file is in toml or yaml or whatever.

So lets try hugo, and maybe I’ll blog more frequently, I hope at least two posts per year are feasible 😜

libnetlink

Sat, 30 Oct 2021 00:00:00 +0000

Recently I wanted to refactor several functions, each function opened the special linux file /proc/net/route, searched for the passed interface-name and returned the queried value in human-readable format.

the file looks like:

Iface	Destination	Gateway 	Flags	RefCnt	Use	Metric	Mask		MTU	Window	IRTT
enp4s0	00000000	0100A8C0	0003	0	0	1024	00000000	0	0	0

The old functions read the file line-by-line “parsed” each line with sscanf, checked if the line is for the interface and returned the corresponding column. The values of interest are IFace (NIC interface name) Gateway, and Metric. In most of the code-path all functions were called one after the other with the same interface-name.

almost always std::shared_ptr NOT!

Thu, 16 Apr 2020 00:00:00 +0000

given the following example classes:

struct Base
{
  virtual Base() = default;
};

struct D : Base
{
};

In good old legacy-code you had a function signature like this:

void func(const Base& base);

In the modern times with shared_ptr it will be this !?

void func(const std::shared_ptr<const Base>& ptr);

But:

int main()
{
  auto ptr = std::make_shared<D>();

  func(ptr);
}

in line 5 (the func-function call) the ptr of type std::shared_ptr<D> has to be converted into a const std::shared_ptr<const Base>&.

So the compiler creates a temporary std::shared_ptr<const Base> object which binds to the const std::shared_ptr<const Base>&.

36c3 talks

Fri, 03 Jan 2020 00:00:00 +0000

Auch letztes Jahr war auch auf dem Chaos Communication Congress (36c3) in Leipzig. Es lohnt sich, auch im Nachhinein, die Vorträge anzugucken.

Hier eine kleine Liste von Vorträge, die ich mir auf dem Congress angeschaut habe.

day 1

SIM card technology from A-Z
Ansible all the Things
Refactoring qaul.net in Rust (Internet independent mesh communication App)

day 2

The Secret Truecrypt Audit from the BSI

day 3

High-assurance crypto software
CTF in a box
X11 and Wayland: A tale of two implementations

day 4

Datacenter - was wir wissen sollten (und trotzdem oft nicht erfahren)
Technische Kompetenz vermitteln - nur wie?

Alle aufgezeichneten Vorträge sind hier finden: https://media.ccc.de/c/36c3

A new blog

Mon, 12 Jun 2017 00:00:00 +0000

So mal mein Versuch ein Blog zu betreiben. Ich hab keine Ahnung was hier so alles erscheinen wird, und auch wird es bestimmt keine regelmäßigen Blogposts geben. Soll (mir) ja schließlich auch Spaß machen.

Und weil einsprachig jeder kann, lege ich mich erstmal noch nicht auf eine Sprache fest.

Also viel Spaß und mal überraschen lassen wann der erste “richtige” Post veröffentlicht wird.