flake.nix

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