flake.nix

   1 {
   2   inputs = {
   3     doom-emacs.flake = false;
   4     doom-emacs.url = "github:hlissner/doom-emacs";
   5     home-manager.inputs.nixpkgs.follows = "nixpkgs";
   6     home-manager.url = "github:nix-community/home-manager";
   7     nix-formatter-pack.inputs.nixpkgs.follows = "nixpkgs";
   8     nix-formatter-pack.url = "github:Gerschtli/nix-formatter-pack";
   9     nixpkgs.url = "github:NixOS/nixpkgs/release-22.11";
  10     pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs";
  11     pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
  12   };
  13
  14   outputs = inputs:
  15     let
  16       remoteNixpkgsPatches = import nixpkgs/patches.nix;
  17       localNixpkgsPatches = [
  18         nixpkgs/patches/mmsd.diff
  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       profile = "/nix/var/nix/profiles/system";
  33       inherit (inputs.nixpkgs) lib;
  34       #nixosSystem = lib.nixosSystem;
  35       nixosSystem = import (nixpkgsPath + "/nixos/lib/eval-config.nix");
  36       forAllSystems = f: lib.genAttrs lib.systems.flakeExposed (system: f rec {
  37         inherit system;
  38         #pkgs = inputs.nixpkgs.legacyPackages.${system};
  39         pkgs = import nixpkgsPath {
  40           inherit system;
  41           overlays = import nixpkgs/overlays.nix;
  42         };
  43       });
  44     in
  45     {
  46       # nix -L build .#nixosConfigurations.oignon.config.system.build.toplevel
  47       # nix -L build .#nixosConfigurations.oignon.config.boot.kernelPackages.kernel.configfile
  48       # nix -L build .#nixosConfigurations.oignon.pkgs.hello
  49       # nix eval --raw .#nixosConfigurations.oignon.config.networking.nftables.rulese
  50       nixosConfigurations = lib.genAttrs
  51         (builtins.attrNames (lib.filterAttrs (_n: v: v == "directory") (builtins.readDir (inputs.self + "/hosts"))))
  52         (hostName: nixosSystem {
  53           system = null;
  54           specialArgs = {
  55             # Required to avoid infinite recursion
  56             # when `inputs` is used in `imports`.
  57             inherit inputs;
  58           };
  59           modules = [
  60             nixos/default.nix
  61             (import (./hosts + "/${hostName}.nix"))
  62             {
  63               _module.args = {
  64                 inherit hostName;
  65                 hosts = inputs.self.nixosConfigurations;
  66                 host = inputs.self.nixosConfigurations.${hostName}._module.args;
  67               };
  68               nixpkgs.overlays = import nixpkgs/overlays.nix;
  69               nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [ "hplip" "geogebra" ];
  70             }
  71             inputs.home-manager.nixosModules.home-manager
  72             {
  73               home-manager.useGlobalPkgs = true;
  74               home-manager.useUserPackages = true;
  75               home-manager.verbose = true;
  76               home-manager.backupFileExtension = null;
  77               home-manager.extraSpecialArgs = {
  78                 inherit hostName inputs;
  79               };
  80             }
  81           ];
  82         });
  83
  84       # nix -L develop  or  direnv allow
  85       devShell = forAllSystems ({ pkgs, system, ... }: pkgs.callPackage ./shell.nix
  86         {
  87           inherit pkgs inputs system nixpkgsPath;
  88           inherit (inputs.self.checks.${system}.pre-commit-check) shellHook;
  89         });
  90
  91       # nix -L run .#oignon.switch
  92       apps = forAllSystems ({ pkgs, system, ... }:
  93         with builtins;
  94         mapAttrs
  95           (hostName: { config, ... }:
  96             let
  97               inherit (config.system) build;
  98               target = "\"\${TARGET:-root@${config.networking.hostName}.${config.networking.domain}}\"";
  99               scriptApp = scriptName: ps: script: {
 100                 type = "app";
 101                 program = (pkgs.writeShellScript "${hostName}-${scriptName}" ''
 102                   export PATH="${lib.makeBinPath ([ pkgs.coreutils ] ++ ps)}:$PATH"
 103                   set -eux
 104                   ${script}
 105                 '').outPath;
 106               };
 107             in
 108             {
 109               # Example: nix run .#aubergine.switch
 110               "switch" = scriptApp "switch" [ ] ''
 111                 shopt -s globstar
 112
 113                 chmod -R g-rwx,o-rwx **/*.gpg
 114                 trap 'git reset **/*.gpg' EXIT
 115                 git rm -rf --cached --ignore-unmatch **/*.gpg # prevent copying to /nix/store
 116
 117                 nix-store --add-root hosts/${hostName}.nixpkgs --indirect --realise ${nixpkgsPath}
 118                 nix-store --add-root hosts/${hostName}.root --indirect --realise ${build.toplevel}
 119
 120                 nix copy --to ssh://${target}${lib.optionalString config.install.substituteOnDestination " --substitute-on-destination"} ${build.toplevel}
 121
 122                 if ssh ${target} set -x ';' \
 123                   systemctl reset-failed nixos-fallback '2>/dev/null' ';' \
 124                   systemd-run -u nixos-fallback --description=nixos-fallback /bin/sh -xc '''\'''
 125                     PATH=${with pkgs; lib.makeBinPath [ coreutils nix systemd ]}
 126                     sleep $((10 * 60))
 127                     ${profile}/bin/switch-to-configuration switch
 128                     systemctl reboot
 129                   '\'''' '&&' \
 130                   ${build.toplevel}/bin/switch-to-configuration test
 131                 then
 132                   ssh ${target} -o ControlPath=none set -x ';' \
 133                     systemctl stop nixos-fallback.service ';' \
 134                     nix-env --profile ${profile} --set '${build.toplevel}' ';' \
 135                     ${build.toplevel}/bin/switch-to-configuration boot '&&' \
 136                     nix-env --delete-generations 7d --profile ${profile}
 137                 else
 138                   tput rev
 139                   echo WARNING: switch-to-configuration was not registered at boot
 140                   tput sgr0
 141                   ssh ${target} -o ControlPath=none set -x ';' \
 142                     systemctl stop nixos-fallback.service
 143                   false
 144                 fi
 145               '';
 146             })
 147           inputs.self.nixosConfigurations);
 148
 149       # nix flake check
 150       checks = forAllSystems (args: with args; {
 151         pre-commit-check = inputs.pre-commit-hooks.lib.${system}.run {
 152           src = inputs.self;
 153           hooks = {
 154             nixpkgs-fmt.enable = true;
 155           };
 156         };
 157       });
 158
 159       # nix fmt
 160       formatter = forAllSystems ({ pkgs, ... }:
 161         inputs.nix-formatter-pack.lib.mkFormatter {
 162           inherit pkgs;
 163           config = {
 164             tools = {
 165               deadnix.enable = true;
 166               nixpkgs-fmt.enable = true;
 167               statix.enable = true;
 168             };
 169           };
 170         }
 171       );
 172     };
 173 }