Posts

TIL: How to Use Default Values in docker-compose.yml Sometimes we want to use env variables in our docker-compose files like so: services: client: image: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/nginx ports: - 8000:80 Here we are going to use the GitLab CI dependency proxy to pull our Nginx image, so we can speed up our pipelines but also avoid being rate limited by docker hub. However, when running this locally, we will need to make sure the CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX env variable is set. ...

TIL: How to Use Open Buffers When Debugging With Neovim’s DAP Plugin I had an issue that whilst debugging my Golang tests in Neovim, the buffer I was focusing on would always change to the breakpoint. Even when the buffer was open and visible already, say I had the code with the breakpoint on the left buffer and the tests I was starting the debugger from on the right buffer. ...

TIL: How to Use Tailscale to Connect to K3S PI Cluster So what do we do if want to connect to our K3S cluster running our RPIs, but we are not on the same network/at home. Well we can look to use a VPN, in this article we will be using tailscale. It is super easy to setup on NixOS, and we need very little config for Tailscale. It also has a generous free tier, which will be more than enough for our home lab use case. ...

In this post, we will go over how we can deploy K3S on our PI cluster we have set up. Which is running NixOS, and we can also pass secrets using sops nix based on the previous parts of this series. Some of you maybe wondering what is K3S, it is a Kubernetes distribution which is tiny i.e. the binary is only 50 MB. It also has fewer dependencies. Make it perfect our PI cluster and home lab and IoT apps. ...

TIL: How to NTFS Drive on NixOS Recently, I was trying to open an NTFS drive on my NixOS machine; however, the drive was corrupted. So I did the following to fix the drive. nix-shell -p ntfs3g ntfsfix /dev/sda1 Where /dev/sda1 is the broken drive. This was enough for me to be able to mount the drive and access the files on it. I didn’t need to fix it on a Window machine. ...

TIL: How to Append to a Config Option String in Nix Recently on my laptop I had to add some extra config settings to my Hyprland config. Rather than polluting my hyprland.nix file with if, else depending on the host. I wanted to add the extra config in the home.nix of the host. So it’s contained within that host. Where my home.nix is the entry point for my home-manager config for that host. ...

TIL: How to Use Sops Nix With Colmena If we are using colmena, how can we set it up when we deploy a secret, for example when deploying k3s the token? i.e. services.k3s.tokenFile = "/my.token";. So to do this first, I will assume you already have a colmena config and sops-nix setup in your config. First, let’s set up our hosts, in this case RPIs which already come /etc/ssh/ssh_host_ed25519_key ssh key we can turn to an age key, i. ...

So in the previous article I showed you how I had set up my 4 RPI (Raspberry Pi) cluster and put NixOS on the machines. They are now connectable over SSH using just their hostnames, i.e. ssh [email protected]. Initially we deployed NixOS and a basic configuration to each of the RPIs manually. We want to automate this process rather than deploying to each machine manually. I looked at bento, but couldn’t quite work out how to make it work for my use case. ...

TIL: How to Set the Path Variable When Using Ubuntu With Nix (Home Manager) As per some of my recent articles, you will be aware I am using Hyprland (tiling manager) on Ubuntu and managing the config using nix (home-manager). I was having issues where for some reason it wouldn’t set the PATH variable correctly. On my NixOS machine, the following would be fine: bind=,XF86AudioRaiseVolume,exec, volume --inc bind=,XF86AudioLowerVolume,exec, volume --dec However, on Ubuntu I needed to provide the full path: ...

As you may know from my previous articles, my work laptop is an Ubuntu (22.04) laptop. However, on the rest of my devices I use NixOS with Hyprland as my tiling window manager. I wanted to be able to use Hyprland on my laptop as well, I tried using Sway and, it worked mostly pretty well, but it was yet another to manage and there were some slight differences. Also, I like the animations on Hyprland 😅. ...

TIL: How to Title Your Terminals When Running Tmux I have been tmux with the foot terminal and when trying to share my screen I couldn’t work out which terminal to share based on the name. Since they are running tmux, all the terminals were titled terminal - t. To fix this and name it after what is running (and where) in tmux, i.e. foot blog/nvim. We can do this by adding the following to our tmux config: ...

TIL: How to Start Gnome Wayland Session From TTY Recently, I moved to Hyprland on Ubuntu. I wanted to start gnome in another TTY (teletype). It was more effort to find than I expected: # Go to teletype CTRL+ALT+1 dbus-run-session -- gnome-shell --display-server --wayland That’s it, short and sweet, this post! You now started gnome in a Wayland session.

Background Recently, I proceeded to experiment with some Raspberry PIs (RPI) that I had lying around. I wanted to do something with them, so I decided I would turn them into a k8s cluster and put various random tools that might be nice to have on it. Such as a GitLab runner, Jellyfin media server & pi hole for ad blocking. Hardware The list below shows the things I used to set up my rpi cluster. ...

TIL: How to Debug a Test in Golang With Build Tags in Neovim I was having issues with my debugger today (well technically yesterday because I am publishing this a day later to spread out my blog posts but same difference) and it took me a few hours to realise what was going on. In my case, I was trying to debug a test written in Golang using nvim-dap-go on Neovim. ...

Preamble Now we have looked at our choice of hardware, which OS to use and specifically, how to configure NixOS (at a high-level), using a git repository. In this part, we will go over which window manager to use. There are two main types we could use here. Either a desktop environment like Gnome or KDE. Which comes with batteries included, it provides us with everything we need and we don’t need to configure much to get stuff working. ...

TIL: How to Install Neovim Nightly Using Nix Home Manager (and NixVim) Recently, I wanted to install the nightly version of Neovim (version 0.10) because it supports inlay hints. However, on nixpkgs the latest version of Neovim as of writing is 0.9.4. So how can we get the nightly release? Using nix/home-manager. Simple, we can use an overlay that will add the Neovim nightly package with the nightly. Assuming we are using nix flakes. ...

TIL: How to Set Network Manager Priority to Use Wired Connection Over Wi-Fi If you use network manager on Linux and have both Wi-Fi and wired connection. You may want to prefer using a wired connection over Wi-Fi, due to stability. To do open the nm-connection-editor, if you are using Nix, you can download it from nixpkgs like usual. Higher number means higher priority. So for our wired connection I set the priority to 100 (it was previously -1) and then for our Wi-Fi connection I set the priority to 1. ...

In this post, I will show you how you can take some JSON and convert it into a Nix attribute set. This was particularly useful when I was creating my waybar configuration. Which is usually in JSON, but defined in my home-manager Nix config it has to be in nixlang. So given this: "custom/notification": { "tooltip": false, "format": "{icon}", "format-icons": { "notification": "<span foreground='red'>^</span>", "none": "", "dnd-notification": "<span foreground='red'>^</span>", "dnd-none": "", "inhibited-notification": "<span foreground='red'>^</span>", "inhibited-none": "", "dnd-inhibited-notification": "<span foreground='red'>^</span>", "dnd-inhibited-none": "" }, "return-type": "json", "exec-if": "which swaync-client", "exec": "swaync-client -swb", "on-click": "swaync-client -t -sw", "on-click-right": "swaync-client -d -sw", "escape": true }, We want it to look something like: ...

I have made an post in the past about how you can set up Atuin to sync share history across multiple devices. Whilst this works great and does the job, fish shell doesn’t have the same history that Atuin does. Sometimes we want to have better suggestions in Fish. For example, when you start to type fish shell will suggest the last command in your history that best matches what you are typing (see example below). ...

TIL: How to Use Clipboard Data as File Input in Bash Recently, I wanted to run a bash script where it needed to receive a JSON file as input. However, the JSON I had was taken from somewhere on the internet. In this case, it was taking a JSON blob and converting it to a nix attribute set. However, I didn’t want to save the contents to a file beforehand. ...

As you may know, I have been using Nix/NixOS for the last few months. I finally started doing some development, after spending lots and lots and lots of time tweaking my setup (and neovim). As part of starting to do some real development work, I am now trying to leverage devshells with Nix flakes. I like the concept of Nix devshells, I have tried using Docker dev containers in the past, but the issue I had with those was adding my tools such as shell (fish) or cli tools was not easy. ...

Premable In this second part of the series, we will look at how we can not set up NixOS past installation. How we can install software and various other tools. After part 1 we should have NixOS installed, mind you since I’ve written that blog post I found a way to create a custom ISO image from my Nix config. This ISO contains a custom install script, the main advantage being able to use a tool called disko to partition our disks. ...

TIL: How to Fix Networking Issues in a Libvirt VM and Mullvad VPN Recently, I was trying to run a libvirt virtual machine, created using virt-manager. The VM was running NixOS and somehow no matter what I did it would not connect to the internet. I was running Mullvad as my VPN, and it turned out this was the app causing issues, I had to turn on Local network share 1. ...

TIL: How to Disable Linters in Golangci Lint for Test Files Today (for once), I ran golangci-lint run and it failed on CI with the following error: internal/options/parser_test.go:13: Function 'TestParse' is too long (69 > 60) (funlen) func TestParse(t *testing.T) { task: Failed to run task "lint": exit status 1 Where my .golangci.yml file looked like this: run: timeout: 5m skip-dirs: - direnv linters: enable: - bodyclose - dogsled - dupl - errcheck - exportloopref - funlen - gochecknoinits - goconst - gocritic - gocyclo - gofmt - goimports - gomnd - goprintffuncname - gosec - gosimple - govet - ineffassign - lll - misspell - nakedret - noctx - nolintlint - revive - staticcheck - stylecheck - typecheck - unconvert - unparam - unused - whitespace So basically we want the ability to turn off funlen for our tests (and other linters). ...

I recently learnt in home-manager (Nix) you can run systemd services as your own user. This is nice because we don’t need “sudo” permissions to do so. I also prefer to have as much of my config as possible in home-manager, again I don’t need to run “sudo”. Which is probably safer running apps in the least privileged mode. In my case, I wanted to run an attic, a binary cache, watch store command which uploads any changes to /nix/store to my binary cache. ...