flake.nix

   1 {
   2 inputs.nixpkgs.url = "github:NixOS/nixpkgs/495b19d5b3e62b4ec7e846bdfb6ef3d9c3b83492";
   3 inputs.home-manager.url = "github:nix-community/home-manager";
   4 inputs.home-manager.inputs.nixpkgs.follows = "nixpkgs";
   5 inputs.doom-emacs.url = "github:hlissner/doom-emacs";
   6 inputs.doom-emacs.flake = false;
   7 /*
   8 inputs.nix-doom-emacs.url = "github:vlaci/nix-doom-emacs";
   9 inputs.nix-doom-emacs.inputs.nixpkgs.follows = "nixpkgs";
  10 inputs.nix-doom-emacs.inputs.home-manager.follows = "home-manager";
  11 inputs.nix-doom-emacs.inputs.flake-utils.follows = "flake-utils";
  12 inputs.nix-doom-emacs.inputs.emacs-overlay.follows = "emacs-overlay";
  13 inputs.emacs-overlay.url = "github:nix-community/emacs-overlay/master";
  14 */
  15 #inputs.pass = { type = "path"; path = "./pass"; flake = false; };
  16
  17 outputs = inputs: let
  18   remoteNixpkgsPatches = import nixpkgs/patches.nix;
  19   localNixpkgsPatches = [
  20   ];
  21   originPkgs = inputs.nixpkgs.legacyPackages."x86_64-linux";
  22   nixpkgsPath = originPkgs.applyPatches {
  23     name = "nixpkgs-patched";
  24     src = inputs.nixpkgs.outPath;
  25     patches = map originPkgs.fetchpatch remoteNixpkgsPatches ++ localNixpkgsPatches;
  26     postPatch = ''
  27       patch=$(printf '%s\n' ${builtins.concatStringsSep " "
  28          (map (p: p.sha256) remoteNixpkgsPatches ++ localNixpkgsPatches)} |
  29         sort | sha256sum | cut -c -7)
  30       echo "-patch-$patch" >.version-suffix
  31     '';
  32   };
  33   lib = inputs.nixpkgs.lib;
  34   forAllSystems = f: lib.genAttrs lib.systems.flakeExposed (system: f rec {
  35     inherit system;
  36     #pkgs = inputs.nixpkgs.legacyPackages.${system};
  37     pkgs = import nixpkgsPath {
  38       inherit system;
  39       config = {
  40         allowUnfree = true; # For hplip
  41       };
  42       overlays = import nixpkgs/overlays.nix;
  43     };
  44   });
  45   nixosSystem = import (nixpkgsPath + "/nixos/lib/eval-config.nix");
  46   #nixosSystem = inputs.nixpkgs.lib.nixosSystem;
  47   in {
  48     nixosConfigurations = lib.genAttrs
  49       (builtins.attrNames (lib.filterAttrs (n: v: v == "directory") (builtins.readDir ./hosts)))
  50       (hostName: nixosSystem {
  51         system = "x86_64-linux";
  52         pkgs = import nixpkgsPath {
  53           system = "x86_64-linux";
  54           config = {
  55             allowUnfree = true; # For hplip
  56           };
  57           overlays = import nixpkgs/overlays.nix;
  58         };
  59         specialArgs = {
  60           inherit hostName inputs;
  61         };
  62         modules = [
  63           {
  64             config._module.args = {
  65               inherit hostName inputs;
  66               hosts = inputs.self.nixosConfigurations;
  67             };
  68           }
  69           (import nixos/modules.nix)
  70           (import nixos/options.nix)
  71           (import (./hosts + "/${hostName}.nix"))
  72           inputs.nixpkgs.nixosModules.notDetected
  73           inputs.home-manager.nixosModules.home-manager
  74           ({ pkgs, ... }: {
  75             nix.registry.nixpkgs = lib.mkDefault { flake = inputs.nixpkgs; };
  76             nix.package = pkgs.nixFlakes;
  77             nix.extraOptions = "experimental-features = nix-command flakes";
  78             #nixpkgs.overlays = import nixpkgs/overlays.nix;
  79             /*
  80             system.nixos.versionSuffix = ".${
  81               lib.substring 0 8 (inputs.self.lastModifiedDate or inputs.self.lastModified)}.${
  82               inputs.self.shortRev or "dirty"}";
  83             system.nixos.revision = lib.mkIf (inputs.self ? rev) inputs.self.rev;
  84             */
  85             # Let 'nixos-version --json' know about the Git revision of this flake.
  86             system.configurationRevision = lib.mkIf (inputs.self ? rev) inputs.self.rev;
  87             /*
  88             system.configurationRevision =
  89               if inputs.self ? rev
  90               then inputs.self.rev
  91               else throw "Refusing to build from a dirty Git tree!";
  92             */
  93           })
  94           {
  95             home-manager.useGlobalPkgs = true;
  96             home-manager.useUserPackages = true;
  97             home-manager.verbose = true;
  98             home-manager.backupFileExtension = null;
  99             home-manager.extraSpecialArgs = {
 100               inherit hostName inputs;
 101             };
 102           }
 103         ];
 104       });
 105     # nix -L develop  or  direnv allow
 106     devShell = forAllSystems ({ pkgs, system, ... }: pkgs.callPackage ./shell.nix
 107       {
 108         inherit pkgs inputs system nixpkgsPath;
 109         #inherit (checks.${system}.pre-commit-check) shellHook;
 110       });
 111     # nix -L run .#oignon.switch
 112     apps = forAllSystems ({ pkgs, system, ... }:
 113       with builtins;
 114       mapAttrs (hostName: { config, ... }:
 115         let
 116           build = config.system.build;
 117           target = "\"\${TARGET:-root@${config.networking.hostName}.${config.networking.domain}}\"";
 118           profile = "/nix/var/nix/profiles/system";
 119           nixos-fallback = { delay ? 5 * 60 }: pkgs.writeShellScript "nixos-fallback" ''
 120             PATH=${with pkgs; lib.makeBinPath [ coreutils config.nix.package systemd ]}
 121             set -eux
 122             fallback=$(realpath -e -- ${profile})
 123             sleep ${lib.escapeShellArg (toString delay)}
 124             echo rollback
 125             exit 0
 126             nix-env --profile ${profile} --set "$fallback"
 127             $fallback/bin/switch-to-configuration switch
 128             systemctl reboot
 129           '';
 130         in rec {
 131         # Example: nix run .#aubergine.switch
 132         "switch" = {
 133           type = "app";
 134           program = (pkgs.writeShellScript "switch" (''
 135             set -eux
 136             set -o pipefail
 137             shopt -s globstar
 138             chmod -R g-rwx,o-rwx **/*.gpg
 139             trap 'git reset **/*.gpg' EXIT
 140             git rm -rf --cached --ignore-unmatch **/*.gpg # prevent copying to /nix/store
 141
 142             nix-store --add-root hosts/${hostName}.nixpkgs --indirect --realise ${nixpkgsPath}
 143             nix-store --add-root hosts/${hostName}.root --indirect --realise ${build.toplevel}
 144             nix copy --to ssh://${target}${lib.optionalString config.install.substituteOnDestination " --substitute-on-destination"} ${build.toplevel}
 145             ssh ${target} \
 146               systemctl reset-failed nixos-fall '2>/dev/null' ';' \
 147               systemd-run -u nixos-fall ${nixos-fallback {}} ';' \
 148               ${profile}/bin/switch-to-configuration test
 149             ssh ${target} -o ControlPath=none \
 150               systemctl stop nixos-fall.service ';' \
 151               nix-env --profile ${profile} --set '${build.toplevel}' ';' \
 152               ${profile}/bin/switch-to-configuration boot '&&' \
 153               nix-env --delete-generations 7d --profile ${profile}
 154             ''
 155           )).outPath;
 156         };
 157       }) inputs.self.nixosConfigurations);
 158   };
 159 }