119 lines
3.2 KiB
Nix
119 lines
3.2 KiB
Nix
{
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description = "An over-engineered Hello World in bash";
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# Nixpkgs / NixOS version to use.
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inputs.nixpkgs.url = "nixpkgs/nixos-21.05";
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outputs = { self, nixpkgs }:
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let
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# to work with older version of flakes
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lastModifiedDate = self.lastModifiedDate or self.lastModified or "19700101";
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# Generate a user-friendly version number.
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version = builtins.substring 0 8 lastModifiedDate;
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# System types to support.
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supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
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# Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
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forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
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# Nixpkgs instantiated for supported system types.
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nixpkgsFor = forAllSystems (system: import nixpkgs { inherit system; overlays = [ self.overlay ]; });
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in
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{
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# A Nixpkgs overlay.
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overlay = final: prev: {
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hello = with final; stdenv.mkDerivation rec {
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name = "hello-${version}";
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unpackPhase = ":";
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installPhase =
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''
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mkdir -p $out/bin
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cp hello $out/bin/
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'';
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};
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};
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# Provide some binary packages for selected system types.
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packages = forAllSystems (system:
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{
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inherit (nixpkgsFor.${system}) hello;
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});
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# The default package for 'nix build'. This makes sense if the
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# flake provides only one package or there is a clear "main"
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# package.
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defaultPackage = forAllSystems (system: self.packages.${system}.hello);
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# A NixOS module, if applicable (e.g. if the package provides a system service).
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nixosModules.hello =
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{ pkgs, ... }:
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{
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nixpkgs.overlays = [ self.overlay ];
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environment.systemPackages = [ pkgs.hello ];
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#systemd.services = { ... };
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};
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# Tests run by 'nix flake check' and by Hydra.
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checks = forAllSystems
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(system:
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with nixpkgsFor.${system};
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{
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inherit (self.packages.${system}) hello;
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# Additional tests, if applicable.
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test = stdenv.mkDerivation {
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name = "hello-test-${version}";
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buildInputs = [ hello ];
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unpackPhase = "true";
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buildPhase = ''
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echo 'running some integration tests'
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[[ $(hello) = 'Hello Nixers!' ]]
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'';
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installPhase = "mkdir -p $out";
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};
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}
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// lib.optionalAttrs stdenv.isLinux {
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# A VM test of the NixOS module.
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vmTest =
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with import (nixpkgs + "/nixos/lib/testing-python.nix") {
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inherit system;
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};
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makeTest {
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nodes = {
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client = { ... }: {
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imports = [ self.nixosModules.hello ];
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};
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};
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testScript =
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''
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start_all()
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client.wait_for_unit("multi-user.target")
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client.succeed("hello")
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'';
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};
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}
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);
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};
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}
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