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|
{
config,
lib,
pkgs,
...
}: let
cfg = config.personal.nix;
hasFlake = cfg.flake != null;
hasFlakeInputs = cfg.autoUpgrade.autoUpdateInputs != [];
checkNetwork = {
path = [pkgs.unixtools.ping];
# Check network connectivity
preStart = "(${lib.concatMapStringsSep " && " (host: "ping -c 1 ${host}") cfg.autoUpgrade.checkHosts}) || kill -s SIGUSR1 $$";
unitConfig = {
StartLimitIntervalSec = 300;
StartLimitBurst = 5;
};
serviceConfig = {
Restart = "on-abort";
RestartSec = 30;
};
};
in {
options.personal.nix = {
enable = lib.mkEnableOption "nix configuration";
autoUpgrade = {
enable = lib.mkEnableOption "automatic system and nixpkgs upgrade";
autoUpdateInputs = lib.mkOption {
type = with lib.types; listOf str;
default = ["nixpkgs"];
};
checkHosts = lib.mkOption {
type = with lib.types; listOf str;
default = config.nix.settings.substituters;
};
};
flake = lib.mkOption {
type = with lib.types; nullOr str;
default = null;
};
gc.enable = lib.mkEnableOption "garbage collection";
remoteBuilds = {
enable = lib.mkEnableOption "remote builds";
machines.hephaistos = {
enable = lib.mkEnableOption "hephaistos remote builder";
domain = lib.mkOption {
type = lib.types.str;
};
protocol = lib.mkOption {
type = lib.types.str;
# Nix custom ssh-variant that avoids lots of "trusted-users" settings pain
default = "ssh-ng";
};
speedFactor = lib.mkOption {
type =
lib.types.int;
default = 4;
};
require = lib.mkOption {
type =
lib.types.bool;
default = true;
description = ''
Whether this remote builder is required to build the configuration.
If so, network connectivity to this remote builder will be checked prior to building.
'';
};
};
};
};
config = lib.mkIf cfg.enable (lib.mkMerge [
{
nixpkgs = {
config.allowUnfree = true;
flake = lib.mkDefault {
setNixPath = false;
setFlakeRegistry = false;
};
};
nix = {
package = pkgs.lix;
settings = {
auto-optimise-store = true;
experimental-features = ["nix-command" "flakes" "recursive-nix"];
substituters = ["https://devenv.cachix.org/" "https://nix-community.cachix.org/"];
trusted-public-keys = ["devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=" "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="];
};
extraOptions = ''
!include secrets.conf
'';
};
}
(lib.mkIf cfg.gc.enable {
nix.gc = {
automatic = true;
dates = "daily";
options = "--delete-old";
};
systemd.services = {
nix-gc = {
after = ["nixos-upgrade.service"];
personal.monitor = true;
};
nix-gc-remove-dead-roots = {
enable = cfg.gc.enable;
description = "Remove dead symlinks in /nix/var/nix/gcroots";
serviceConfig.Type = "oneshot";
script = "find /nix/var/nix/gcroots -xtype l -delete";
before = ["nix-gc.service"];
wantedBy = ["nix-gc.service"];
personal.monitor = true;
};
nix-gc-remove-old-hm-gens = let
user = config.personal.user;
in {
enable = user.enable && user.homeManager.enable;
description = "Remove old Home Manager generations for user ${user.name}";
serviceConfig.Type = "oneshot";
script = "${pkgs.nix}/bin/nix-env --profile /home/${user.name}/.local/state/nix/profiles/home-manager --delete-generations old";
before = ["nix-gc.service"];
wantedBy = ["nix-gc.service"];
personal.monitor = true;
};
};
})
(lib.mkIf cfg.autoUpgrade.enable {
personal.boot.unattendedReboot = lib.mkIf config.system.autoUpgrade.allowReboot true;
system.autoUpgrade = {
enable = true;
flake = cfg.flake;
flags = lib.optional (!hasFlake) "--upgrade-all";
};
systemd.services.nixos-upgrade = lib.mkMerge [
checkNetwork
{
preStart = lib.mkAfter ''
${config.system.build.nixos-rebuild}/bin/nixos-rebuild dry-build ${toString config.system.autoUpgrade.flags}
'';
personal.monitor = true;
}
(let
luksCfg = config.boot.initrd.luks.devices;
cryptExists = luksCfg ? crypt;
cryptCfg = luksCfg.crypt;
in
lib.mkIf (cryptExists && config.system.autoUpgrade.allowReboot) {
script = lib.mkAfter ''
cryptsetup --verbose luksAddKey --key-file /etc/luks/keys/master ${cryptCfg.device} /etc/luks/keys/tmp
'';
postStop = ''
# if a reboot due to nixos-upgrade happens, it should occur within a minute
sleep 120
# if no reboot has happened, disable any leftover keyfile
while cryptsetup --verbose luksRemoveKey ${cryptCfg.device} --key-file /etc/luks/keys/tmp
do
:
done
'';
})
];
})
(lib.mkIf hasFlake {
systemd.services.flake-update = lib.mkIf hasFlakeInputs (lib.mkMerge [
checkNetwork
{
unitConfig.Description = "Update flake inputs";
serviceConfig = {
ExecStart = "${config.nix.package}/bin/nix flake update --commit-lock-file --flake ${cfg.flake} " + lib.concatStringsSep " " cfg.autoUpgrade.autoUpdateInputs;
Type = "oneshot"; # Ensure that it finishes before starting nixos-upgrade
};
before = ["nixos-upgrade.service"];
requiredBy = ["nixos-upgrade.service"];
path = [pkgs.git];
personal.monitor = true;
}
]);
programs.git = lib.mkIf (lib.hasPrefix "git+file" cfg.flake) {
enable = true;
config.user = lib.mkDefault {
name = "Root user of ${config.networking.hostName}";
email = "root@${config.networking.hostName}";
};
};
})
(lib.mkIf cfg.remoteBuilds.enable (with cfg.remoteBuilds.machines.hephaistos; {
nix = {
distributedBuilds = true;
settings.builders-use-substitutes = true;
buildMachines = lib.optional enable {
inherit protocol speedFactor;
hostName = "hephaistos.${domain}";
system = "x86_64-linux";
maxJobs = 4;
supportedFeatures = ["nixos-test" "benchmark" "big-parallel" "kvm" "recursive-nix"];
mandatoryFeatures = [];
};
};
personal.nix.autoUpgrade.checkHosts = lib.mkOptionDefault (lib.optional require "hephaistos.${domain}");
programs.ssh = {
extraConfig = lib.optionalString enable ''
Host hephaistos.${domain}
# Prevent using ssh-agent or another keyfile, useful for testing
IdentitiesOnly yes
IdentityFile /etc/ssh/nixremote
# The weakly privileged user on the remote builder
# If not set, 'root' is used – which will hopefully fail
User nixremote
'';
knownHosts."hephaistos.${domain}".publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHvtqi8tziBuviUV8LDK2ddQQUbHdJYB02dgWTK5Olxq";
};
}))
]);
}
|
