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Justus Perlwitz

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Generate Nix binary caches without nix copy

Here's how to create a Nix binary cache from a derivation's closure within a Nix derivation. Since you can't run nix commands within derivations, this can be useful for including a build closure within an installation medium, such as when performing a NixOS offline installation.

Using Japanese banks while renewing your visa

I'm currently renewing my visa (residence permit, 在留許可) in Japan. While I've submitted my application 3 months ahead of its expiry, the Immigration Services Agency (出入国在留管理庁) appears to be overwhelmed with applications.

Can uBlock Origin block WebRTC?

Do you loathe online banking as much as I do? Does your bank make online banking more cumbersome each week in the name of "combating fraud" and "staying compliant" with anti-money laundering and counter terrorist financing laws? Have you ever looked under online banking's hood? Here's an example from a bank that I use in Japan to pay for life necessities and to keep a roof over my head.

Jump between pytest errors with Vim's QuickFix

Here's how you can use the Vim and Neovim QuickFix feature to conveniently jump between pytest errors without leaving your editor.

Koriander CMS roadmap

This page contains features and fixes that I'm planning to implement for Koriander CMS

Similar Kanji, 衣脚 edition

Four Chinese characters that I regularly confuse have a 衣 radical at the bottom (ja: したごろも).

Create your first Koriander CMS site

Here's how to make your first page in Koriander CMS.

Cybersecurity by the book

Consider this past question from an "ethical hacking" certification posted on itexamanswers.net :

How to install MediaWiki on Debian 13

Here's how to install MediaWiki on a desktop computer running Debian 13 (Trixie) .

Koriander: now on PyPI

Try installing Koriander CMS from PyPI. All you need to run is the following, provided that you've installed pipx : bash pipx install koriander

Koriander: Creating my own CMS

For the past few months I've been working on my own CMS called Koriander .

PatriotCTF 2024 Blob Writeup

This article contains my writeup for the PatriotCTF 2024 Blob challenge.

Fetch The Flag 2023 Bedsheets Writeup

This is a writeup for the Fetch The Flag 2023 Bedsheets challenge.

Fetch The Flag 2023 Beep64 Writeup

This is a writeup for the Fetch The Flag 2023 Beep64 challenge.

Fetch The Flag 2023 Finders Keepers

This is a writeup for the Fetch The Flag 2023 Finders Keepers challenge.