Build image in ci (#335)

* build image in cI

* update README

* Update README

* run checks on linux

* fix issues

* fmt

* Disable magic nix cache for now

* only build on x86 and no magic-nix-cache

* last try. fix ci. the loop continues

* another one flakes the dust

* Try with cachix installer to reproduce

Author: arianvp

.github/workflows/ci.yml

@@ -20,8 +20,7 @@ jobs:
             system: aarch64-linux
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-      - uses: DeterminateSystems/nix-installer-action@7993355175c2765e5733dae74f3e0786fe0e5c4f # v12
-      - uses: DeterminateSystems/magic-nix-cache-action@87b14cf437d03d37989d87f0fa5ce4f5dc1a330b # v8
+      - uses: cachix/install-nix-action@4e002c8ec80594ecd40e759629461e26c8abed15 # v31.9.0
       - run: nix flake check -L --system ${{ matrix.runs-on.system }}
   publish:
     if: github.event_name == 'push'

README.md

@@ -12,13 +12,13 @@ Yes! for example with a config like this:
 
 ```nix
 {
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.nixpkgs.url = "https://channels.nixos.org/nixos-unstable/nixexprs.tar.xz";
 
   outputs = { nixpkgs, ... }: {
     nixosConfigurations.my-system = nixpkgs.lib.nixosSystem {
       modules = [
-        "${nixpkgs}/nixos/maintainers/scripts/ec2/amazon-image.nix"
-        {
+        { modulesPath, ... }:
+          imports = [ "${modulesPath}/virtualisation/amazon-image.nix" ];
           virtualisation.diskSize = "auto";  # or gigabytes. default is 3 * 1024
           nixpkgs.hostPlatform = "x86_64-linux";
           services.nginx.enable = true;
@@ -32,7 +32,17 @@ Yes! for example with a config like this:
 you can upload it to your account like this:
 
 ```bash
-nix build .#nixosConfigurations.my-system.config.system.build.amazonImage
+nix build .#nixosConfigurations.my-system.config.system.build.images.amazon
+```
+
+Or you can use the the shorthand:
+
+```bash
+nixos-rebuild build-image --image-variant amazon --flake .#my-system
+```
+Then upload it with:
+
+```bash
 nix run github:NixOS/amis#upload-ami -- --prefix my-system --s3-bucket my-bucket --image-info ./result/nix-support/image-info.json
 ```
 

flake.nix

@@ -19,11 +19,14 @@
     let
       inherit (nixpkgs) lib;
       inherit (lib) genAttrs mapAttrs;
-      supportedSystems = [
+      linuxSystems = [
         "aarch64-linux"
         "x86_64-linux"
-        "aarch64-darwin"
       ];
+      supportedSystems = [
+        "aarch64-darwin"
+      ]
+      ++ linuxSystems;
       eachSystem = f: genAttrs supportedSystems (system: f nixpkgs.legacyPackages.${system});
       treefmtEval = eachSystem (
         pkgs:
@@ -63,12 +66,31 @@
         mapAttrs mkApp self.packages.${system}.upload-ami.passthru.upload-ami.pyproject.project.scripts
       );
 
+      # NOTE: We don't build the production images with these (yet). We use a hydra job instead
+      # NOTE: Github Actions doesn't support kvm on arm64 builds
+      nixosConfigurations.x86_64-linux = nixpkgs.lib.nixosSystem {
+        modules = [
+          (
+            { modulesPath, ... }:
+            {
+              imports = [ "${modulesPath}/virtualisation/amazon-image.nix" ];
+              nixpkgs.hostPlatform = "x86_64-linux";
+              system.stateVersion = "26.05";
+            }
+          )
+        ];
+      };
+
       formatter = eachSystem (pkgs: treefmtEval.${pkgs.system}.config.build.wrapper);
 
-      checks = genAttrs supportedSystems (system: {
-        inherit (self.packages.${system}) upload-ami;
-        formatting = treefmtEval.${system}.config.build.check self;
-      });
+      checks =
+        genAttrs linuxSystems (system: {
+          inherit (self.packages.${system}) upload-ami;
+          formatting = treefmtEval.${system}.config.build.check self;
+        })
+        // {
+          x86_64-linux.system = self.nixosConfigurations.x86_64-linux.config.system.build.images.amazon;
+        };
 
       devShells = genAttrs supportedSystems (system: {
         default = self.packages.${system}.upload-ami;