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

@@ -4,30 +4,28 @@
 
 { config, pkgs, ... }:
 let
-    profile = import ./profile.nix;
+  profile = import ./profile.nix;
 in
 {
-  imports =
-    [ # Include the results of the hardware scan.
-      ./hardware-configuration.nix
-      ./cron-schedule.nix
-      ./home-manager.nix
-    ];
+  imports = [
+    # Include the results of the hardware scan.
+    ./hardware-configuration.nix
+    ./cron-schedule.nix
+    ./home-manager.nix
+  ];
 
   # Bootloader.
   boot.loader.systemd-boot.enable = true;
   boot.loader.efi.canTouchEfiVariables = true;
 
-boot.extraModulePackages = with config.boot.kernelPackages; [
-  v4l2loopback
-];
-
-boot.kernelModules = [ "v4l2loopback" ];
-boot.extraModprobeConfig = ''
-  options v4l2loopback video_nr=10 card_label=snapcam exclusive_caps=1
-'';
-
+  boot.extraModulePackages = with config.boot.kernelPackages; [
+    v4l2loopback
+  ];
 
+  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.
@@ -36,9 +34,9 @@ boot.extraModprobeConfig = ''
   networking.networkmanager = {
     enable = true;
     plugins = with pkgs; [
-        networkmanager-ssh
-        networkmanager-openvpn
-        networkmanager-strongswan
+      networkmanager-ssh
+      networkmanager-openvpn
+      networkmanager-strongswan
     ];
 
   };
@@ -85,33 +83,32 @@ boot.extraModprobeConfig = ''
   console.keyMap = "de-latin1";
 
   environment.systemPackages = with pkgs; [
-        wget
-        strongswan
-        epiphany
-        nodejs_24
-        dive
-        podman-tui
-        podman-compose
-        gmp
-        gmp.dev
-        pkg-config
+    wget
+    strongswan
+    nodejs_24
+    dive
+    podman-tui
+    podman-compose
+    gmp
+    gmp.dev
+    pkg-config
   ];
 
   programs.nix-ld = {
     enable = true;
     libraries = with pkgs; [
-        stdenv.cc.cc
-        zlib
-        gmp
-        openssl
-        curl
-        glib
-        gtk3
-        libGL
-        xorg.libX11
-        appimage-run
-        libgcrypt
-        libxcrypt
+      stdenv.cc.cc
+      zlib
+      gmp
+      openssl
+      curl
+      glib
+      gtk3
+      libGL
+      xorg.libX11
+      appimage-run
+      libgcrypt
+      libxcrypt
     ];
   };
 
@@ -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

@@ -19,12 +19,17 @@ in
         extraGroups = ["disks" "storage" "networkmanager" "wheel" "docker" "scanner" "lp" "uucp" "dialout"];
         packages = with pkgs; [];
         shell = pkgs.zsh;
-	hashedPassword = profile.hashed-password;
+	    hashedPassword = profile.hashed-password;
     };
 
     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