Add container and nixos config

.gitignore

@@ -1 +1,2 @@
 /result
+*.qcow2

flake.nix

@@ -10,6 +10,12 @@
   in {
     packages = pkgsFor (pkgs: {
       default = pkgs.callPackage ./what-is-my-ip.nix {};
+      container = pkgs.dockerTools.buildImage {
+        name = "what-is-my-ip-container";
+        config = {
+          Cmd = ["${self.outputs.packages.${pkgs.system}.default}/bin/what-is-my-ip"];
+        };
+      };
     });
 
     devShells = pkgsFor (pkgs: {
@@ -20,5 +26,27 @@
         '';
       };
     });
+
+    nixosConfigurations = let
+      system = "x86_64-linux";
+    in {
+      default = nixpkgs.lib.nixosSystem {
+        inherit system;
+        modules = [
+          {
+            users.users.alice = {
+              isNormalUser = true;
+              # enable sudo
+              extraGroups = ["wheel"];
+              packages = [
+                self.outputs.packages.${system}.default
+              ];
+              initialPassword = "swordfish";
+            };
+            system.stateVersion = "24.05";
+          }
+        ];
+      };
+    };
   };
 }

post.md

@@ -126,72 +126,96 @@ We can now do binary or source deployments 🚀🛠️📦 since we know the ful
 
 ```console
 $ nix copy --to ssh://beefcake $(nix build --print-out-paths)
-$ ssh beefcake
+$ ssh beefcake /nix/store/lr6wlz2652r35rwzc79samg77l6iqmii-what-is-my-ip/bin/what-is-my-ip
-
-[fmzakari@nixie:~]$ /nix/store/lr6wlz2652r35rwzc79samg77l6iqmii-what-is-my-ip/bin/what-is-my-ip
 98.147.178.19
 ```
 
-Maybe though you are stuck with Kubernetes or Docker. Let's use Nix to create an OCI compatible image.
+Maybe though you are stuck with Kubernetes or Docker. Let's use Nix to create an OCI-compatible image.
 
-```nix
+```diff
-let
+diff --git a/flake.nix b/flake.nix
-  pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-24.05.tar.gz") {};
+index 99d6d52..81e98c9 100644
-  what-is-my-ip = import ./what-is-my-ip.nix {inherit pkgs;};
+--- a/flake.nix
-in
++++ b/flake.nix
-  pkgs.dockerTools.buildImage {
+@@ -10,6 +10,12 @@
-    name = "what-is-my-ip-docker";
+   in {
-    config = {
+     packages = pkgsFor (pkgs: {
-      Cmd = ["${what-is-my-ip}/bin/what-is-my-ip"];
+       default = pkgs.callPackage ./what-is-my-ip.nix {};
++      container = pkgs.dockerTools.buildImage {
++        name = "what-is-my-ip-container";
++        config = {
++          Cmd = ["${self.outputs.packages.${pkgs.system}.default}/bin/what-is-my-ip"];
++        };
++      };
+     });
+ 
+     devShells = pkgsFor (pkgs: {
+```
+
+```bash
+$ docker load < $(nix build .#docker-image --print-out-paths)
+Loaded image: what-is-my-ip-docker:c9g6x30invdq1bjfah3w1aw5w52vkdfn
+$ docker run -it what-is-my-ip-docker:c9g6x30invdq1bjfah3w1aw5w52vkdfn
+24.5.113.148
+```
+
+Cool! Nix + Docker integration perfectly. The image produced has only the files exactly necessary to run the tool provided, effectively **distroless**. You may also note that if you are following along, your image digest is exactly the same. **Reproducibility!**
+
+Finally, let's take the last step and create a reproducible operating system using NixOS to contain only the programs we want.
+
+```diff
+diff --git a/flake.nix b/flake.nix
+index 99d6d52..81e98c9 100644
+--- a/flake.nix
++++ b/flake.nix
+@@ -10,6 +10,12 @@
+   in {
+     packages = pkgsFor (pkgs: {
+       default = pkgs.callPackage ./what-is-my-ip.nix {};
++      container = pkgs.dockerTools.buildImage {
++        name = "what-is-my-ip-container";
++        config = {
++          Cmd = ["${self.outputs.packages.${pkgs.system}.default}/bin/what-is-my-ip"];
++        };
++      };
+     });
+ 
+     devShells = pkgsFor (pkgs: {
+@@ -20,5 +26,27 @@
+         '';
+       };
+     });
++
++    nixosConfigurations = let
++      system = "x86_64-linux";
++    in {
++      default = nixpkgs.lib.nixosSystem {
++        inherit system;
++        modules = [
++          {
++            users.users.alice = {
++              isNormalUser = true;
++              # enable sudo
++              extraGroups = ["wheel"];
++              packages = [
++                self.outputs.packages.${system}.default
++              ];
++              initialPassword = "swordfish";
++            };
++            system.stateVersion = "24.05";
++          }
++        ];
++      };
++    };
    };
  }
 ```
 
-```bash
-❯ docker load < $(nix-build what-is-my-ip-docker.nix)
-Loaded image: what-is-my-ip-docker:c9g6x30invdq1bjfah3w1aw5w52vkdfn
-
-❯ docker run -it what-is-my-ip-docker:c9g6x30invdq1bjfah3w1aw5w52vkdfn
-24.5.113.148
-```
-
-Cool! Nix + Docker integration perfectly. The image produced has only the files exactly necessary to run the tool provided, effectively **distroless**.
-
-Finally, let's take the last step and create a reproducible operating system using NixOS to contain only the programs we want.
-
-```nix
-let
-  nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-24.05.tar.gz";
-  pkgs = import nixpkgs {};
-  what-is-my-ip = import ./what-is-my-ip.nix {inherit pkgs;};
-  nixos = import "${nixpkgs}/nixos" {
-    configuration = {
-      users.users.alice = {
-        isNormalUser = true;
-        # enable sudo
-        extraGroups = ["wheel"];
-        packages = [
-          what-is-my-ip
-        ];
-        initialPassword = "swordfish";
-      };
-
-      system.stateVersion = "24.05";
-    };
-  };
-in
-  nixos.vm
-```
-
 ```console
-❯ nix-build what-is-my-ip-vm.nix
+$ nixos-rebuild build-vm --flake .#default
-
+$ ./result/bin/run-nixos-vm
-❯ QEMU_KERNEL_PARAMS=console=ttyS0 ./result/bin/run-nixos-vm -nographic; reset
-
-<<< Welcome to NixOS 24.05pre-git (x86_64) - ttyS0 >>>
-
-Run 'nixos-help' for the NixOS manual.
 
+# I/O snippet from QEMU
 nixos login: alice
 Password: 
 
@@ -207,7 +231,7 @@ Password:
 
 💥 Hash **lr6wlz2652r35rwzc79samg77l6iqmii** present again!
 
-We took a relatively simple script through a variety of applications in the Nix ecosystem: build recipe, shell, docker image and finally NixOS VM.
+We took a relatively simple script through a variety of applications in the Nix ecosystem: build recipe, shell, docker image, and finally NixOS VM.
 
 Hopefully, seeing the _fun things_ you can do with Nix might inspire you to push through the hard parts.