[add] example-ros2-gz shell

examples/ros2-gz-example.nix

@@ -0,0 +1,42 @@
+# gz needs insecure packages, namely freeimage-unstable-2021-11-01
+# to run this dev shell use:
+# NIXPKGS_ALLOW_INSECURE=1 nix develop --impure .\#example-ros2-gz
+
+{pkgs ? import ../. {}}:
+with pkgs;
+with rosPackages.jazzy;
+  mkShell {
+    nativeBuildInputs = [
+      (buildEnv {
+        paths = [
+          colcon
+          ros-core
+          ament-cmake-core
+          python-cmake-module
+          # ros-gz
+
+          gz-cmake-vendor
+          gz-common-vendor
+          gz-dartsim-vendor
+          gz-fuel-tools-vendor
+          gz-gui-vendor
+          gz-launch-vendor
+          gz-math-vendor
+          gz-msgs-vendor
+          gz-ogre-next-vendor
+          gz-physics-vendor
+          gz-plugin-vendor
+          gz-rendering-vendor
+          gz-sensors-vendor
+          gz-sim-vendor
+          gz-tools-vendor
+          gz-transport-vendor
+          gz-utils-vendor
+        ];
+      })
+    ];
+    GZ_CONFIG_PATH = "${gz-tools-vendor}/opt/gz_tools_vendor/share/gz:${gz-gui-vendor}/opt/gz_gui_vendor/share/gz\:${gz-cmake-vendor}/opt/gz_cmake_vendor/share/gz\:${gz-fuel-tools-vendor}/opt/gz_fuel_tools_vendor/share/gz\:${gz-launch-vendor}/opt/gz_launch_vendor/share/gz\:${gz-math-vendor}/opt/gz_math_vendor/share/gz\:${gz-msgs-vendor}/opt/gz_msgs_vendor/share/gz\:${gz-physics-vendor}/opt/gz_physics_vendor/share/gz\:${gz-plugin-vendor}/opt/gz_plugin_vendor/share/gz\:${gz-rendering-vendor}/opt/gz_rendering_vendor/share/gz\:${gz-sensors-vendor}/opt/gz_sensors_vendor/share/gz\:${gz-sim-vendor}/opt/gz_sim_vendor/share/gz\:${gz-transport-vendor}/opt/gz_transport_vendor/share/gz\:${gz-utils-vendor}/opt/gz_utils_vendor/share/gz";
+    shellHook = ''
+      unset QT_QPA_PLATFORM
+    '';
+  }

flake.nix

@@ -20,6 +20,7 @@
       devShells = {
         example-turtlebot3-gazebo = import ./examples/turtlebot3-gazebo.nix { inherit pkgs; };
         example-ros2-basic = import ./examples/ros2-basic.nix { inherit pkgs; };
+        example-ros2-gz = import ./examples/ros2-gz-example.nix { inherit pkgs; };
       };
     }) // {
       overlays.default = import ./overlay.nix;