First attempts on using distrobox

applications/open-modelica.nix

@@ -1,9 +0,0 @@
-{ config, pkgs, lib, ... }:
-let
-    profile = import ./profile.nix;
-in
-{
-    environment.systemPackages = with pkgs; [
-        openmodelica.combined
-    ];
-}

applications/speed-dreams.nix

@@ -1,9 +0,0 @@
-{ config, pkgs, lib, ... }:
-let
-    profile = import ./profile.nix;
-in
-{
-    environment.systemPackages = with pkgs; [
-        speed_dreams
-    ];
-}

configuration.nix

@@ -7,8 +7,8 @@ let
   profile = import ./profile.nix;
 in
 {
-  imports =
-    [ # Include the results of the hardware scan.
+  imports = [
+    # Include the results of the hardware scan.
     ./hardware-configuration.nix
     ./cron-schedule.nix
     ./home-manager.nix
@@ -18,16 +18,14 @@ in
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
-boot.extraModulePackages = with config.boot.kernelPackages; [
+  boot.extraModulePackages = with config.boot.kernelPackages; [
     v4l2loopback
-];
+  ];
 
-boot.kernelModules = [ "v4l2loopback" ];
-boot.extraModprobeConfig = ''
+  boot.kernelModules = [ "v4l2loopback" ];
+  boot.extraModprobeConfig = ''
     options v4l2loopback video_nr=10 card_label=snapcam exclusive_caps=1
-'';
-
-
+  '';
 
   networking.hostName = profile.hostname; # Define your hostname.
   # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
@@ -87,7 +85,6 @@ boot.extraModprobeConfig = ''
   environment.systemPackages = with pkgs; [
     wget
     strongswan
-        epiphany
     nodejs_24
     dive
     podman-tui
@@ -140,7 +137,10 @@ boot.extraModprobeConfig = ''
 
   # Enable the OpenSSH daemon.
   services.openssh.enable = true;
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
   nixpkgs.config.allowUnfree = true;
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions

desktop-environment/config.nix

@@ -8,7 +8,7 @@ in
         ./browser.nix
         ./planner.nix
         ./window-manager.nix
-        ../applications/matrix-element.nix
+        ../applications/matrix.nix
     ];
 
     environment.systemPackages = with pkgs; [

home-manager.nix

@@ -25,6 +25,11 @@ in
     home-manager.backupFileExtension = "bck.lck";
 
     home-manager.users.${profile.username} = { pkgs, ... }: {
+
+        imports = [
+            ./terminal-environment/genv
+        ];
+
         home.stateVersion = "25.11";
         programs.git = {
             enable = true;

terminal-environment/config.nix

@@ -13,6 +13,7 @@ in
         astyle
         hyfetch
         fzf-zsh
+        distrobox
     ];
 
     programs.tmux = {

terminal-environment/genv/default.nix

@@ -0,0 +1,67 @@
+{ pkgs, lib, ... }:
+
+let
+  genv = pkgs.writeShellScriptBin "genv" ''
+    #!/usr/bin/env bash
+    set -e
+
+    DISTRO="$1"
+    PRESET="$2"
+
+    if [ -z "$DISTRO" ] || [ -z "$PRESET" ]; then
+      echo "Usage: genv <distro> <preset>"
+      exit 1
+    fi
+
+    PROJECT=$(basename "$PWD")
+    BOX="genv-$PROJECT"
+
+    # distro mapping
+    case "$DISTRO" in
+      ubuntu) IMAGE="docker.io/library/ubuntu:24.04" ;;
+      arch) IMAGE="docker.io/library/archlinux:latest" ;;
+      alpine) IMAGE="docker.io/library/alpine:latest" ;;
+      *) IMAGE="$DISTRO" ;;
+    esac
+
+    echo "[genv] image: $IMAGE"
+
+    # container nur erstellen wenn nötig
+    if ! distrobox list | grep -q "$BOX"; then
+      distrobox create --name "$BOX" --image "$IMAGE"
+    fi
+
+    mkdir -p .genv
+
+    # preset kopieren
+    cp ${./presets}/$PRESET.sh .genv/setup.sh
+    chmod +x .genv/setup.sh
+
+    # envrc generieren
+    cat > .envrc <<EOF
+export GENV_BOX="$BOX"
+
+# container starten
+distrobox start "$GENV_BOX" >/dev/null 2>&1 || true
+
+# setup einmalig
+if [ ! -f .genv/.init ]; then
+  echo "[genv] setup läuft"
+  distrobox enter "$GENV_BOX" -- bash .genv/setup.sh
+  touch .genv/.init
+fi
+
+# tmux workflow
+if [ -z "$TMUX" ]; then
+  tmux new-session -A -s "$GENV_BOX" \
+    \; new-window -n editor "nvim" \
+    \; new-window -n dev "distrobox enter $GENV_BOX"
+fi
+EOF
+
+    echo "[genv] fertig → direnv allow"
+  '';
+in
+{
+  home.packages = [ genv ];
+}

terminal-environment/genv/presets/c.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -e
+
+if command -v apt >/dev/null; then
+  sudo apt update
+  sudo apt install -y build-essential cmake
+elif command -v pacman >/dev/null; then
+  sudo pacman -Sy --noconfirm base-devel cmake
+elif command -v apk >/dev/null; then
+  sudo apk add build-base cmake
+fi

terminal-environment/genv/presets/data-science.sh

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+set -e
+
+if command -v apt >/dev/null; then
+  sudo apt update
+  sudo apt install -y python3
+elif command -v pacman >/dev/null; then
+  sudo pacman -Sy --noconfirm base-devel python3
+elif command -v apk >/dev/null; then
+  sudo apk add build-base python3
+fi