129 lines
3.8 KiB
Nix
129 lines
3.8 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let cfg = config.system.autoUpgrade; in
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{
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options = {
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system.autoUpgrade = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to periodically upgrade NixOS to the latest
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version. If enabled, a systemd timer will run
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<literal>nixos-rebuild switch --upgrade</literal> once a
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day.
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'';
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};
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channel = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "https://nixos.org/channels/nixos-14.12-small";
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description = ''
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The URI of the NixOS channel to use for automatic
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upgrades. By default, this is the channel set using
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<command>nix-channel</command> (run <literal>nix-channel
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--list</literal> to see the current value).
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'';
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};
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flags = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "-I" "stuff=/home/alice/nixos-stuff" "--option" "extra-binary-caches" "http://my-cache.example.org/" ];
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description = ''
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Any additional flags passed to <command>nixos-rebuild</command>.
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'';
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};
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dates = mkOption {
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default = "04:40";
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type = types.str;
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description = ''
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Specification (in the format described by
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>) of the time at
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which the update will occur.
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'';
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};
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allowReboot = mkOption {
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default = false;
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type = types.bool;
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description = ''
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Reboot the system into the new generation instead of a switch
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if the new generation uses a different kernel, kernel modules
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or initrd than the booted system.
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'';
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};
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randomizedDelaySec = mkOption {
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default = "0";
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type = types.str;
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example = "45min";
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description = ''
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Add a randomized delay before each automatic upgrade.
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The delay will be chozen between zero and this value.
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This value must be a time span in the format specified by
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>
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'';
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};
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};
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};
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config = lib.mkIf cfg.enable {
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system.autoUpgrade.flags =
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[ "--no-build-output" ]
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++ (if cfg.channel == null
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then [ "--upgrade" ]
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else [ "-I" "nixpkgs=${cfg.channel}/nixexprs.tar.xz" ]);
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systemd.services.nixos-upgrade = {
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description = "NixOS Upgrade";
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restartIfChanged = false;
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unitConfig.X-StopOnRemoval = false;
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serviceConfig.Type = "oneshot";
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environment = config.nix.envVars //
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{ inherit (config.environment.sessionVariables) NIX_PATH;
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HOME = "/root";
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} // config.networking.proxy.envVars;
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path = with pkgs; [ coreutils gnutar xz.bin gzip gitMinimal config.nix.package.out ];
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script = let
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nixos-rebuild = "${config.system.build.nixos-rebuild}/bin/nixos-rebuild";
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in
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if cfg.allowReboot then ''
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${nixos-rebuild} boot ${toString cfg.flags}
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booted="$(readlink /run/booted-system/{initrd,kernel,kernel-modules})"
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built="$(readlink /nix/var/nix/profiles/system/{initrd,kernel,kernel-modules})"
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if [ "$booted" = "$built" ]; then
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${nixos-rebuild} switch ${toString cfg.flags}
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else
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/run/current-system/sw/bin/shutdown -r +1
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fi
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'' else ''
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${nixos-rebuild} switch ${toString cfg.flags}
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'';
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startAt = cfg.dates;
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};
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systemd.timers.nixos-upgrade.timerConfig.RandomizedDelaySec = cfg.randomizedDelaySec;
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};
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}
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