8a45d4525b
GitOrigin-RevId: 710fed5a2483f945b14f4a58af2cd3676b42d8c8
228 lines
7 KiB
Nix
228 lines
7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let cfg = config.system.autoUpgrade;
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in {
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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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flake = mkOption {
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type = types.nullOr types.str;
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default = null;
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example = "github:kloenk/nix";
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description = ''
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The Flake URI of the NixOS configuration to build.
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Disables the option <option>system.autoUpgrade.channel</option>.
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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 = [
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"-I"
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"stuff=/home/alice/nixos-stuff"
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"--option"
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"extra-binary-caches"
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"http://my-cache.example.org/"
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];
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description = ''
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Any additional flags passed to <command>nixos-rebuild</command>.
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If you are using flakes and use a local repo you can add
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<command>[ "--update-input" "nixpkgs" "--commit-lock-file" ]</command>
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to update nixpkgs.
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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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See <option>rebootWindow</option> for configuring the times at which a reboot is allowed.
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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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rebootWindow = mkOption {
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description = ''
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Define a lower and upper time value (in HH:MM format) which
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constitute a time window during which reboots are allowed after an upgrade.
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This option only has an effect when <option>allowReboot</option> is enabled.
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The default value of <literal>null</literal> means that reboots are allowed at any time.
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'';
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default = null;
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example = { lower = "01:00"; upper = "05:00"; };
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type = with types; nullOr (submodule {
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options = {
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lower = mkOption {
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description = "Lower limit of the reboot window";
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type = types.strMatching "[[:digit:]]{2}:[[:digit:]]{2}";
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example = "01:00";
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};
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upper = mkOption {
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description = "Upper limit of the reboot window";
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type = types.strMatching "[[:digit:]]{2}:[[:digit:]]{2}";
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example = "05:00";
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};
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};
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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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assertions = [{
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assertion = !((cfg.channel != null) && (cfg.flake != null));
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message = ''
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The options 'system.autoUpgrade.channels' and 'system.autoUpgrade.flake' cannot both be set.
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'';
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}];
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system.autoUpgrade.flags = (if cfg.flake == null then
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[ "--no-build-output" ] ++ optionals (cfg.channel != null) [
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"-I"
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"nixpkgs=${cfg.channel}/nixexprs.tar.xz"
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]
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else
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[ "--flake ${cfg.flake}" ]);
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systemd.services.nixos-upgrade = {
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description = "NixOS Upgrade";
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restartIfChanged = false;
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unitConfig.X-StopOnRemoval = false;
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serviceConfig.Type = "oneshot";
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environment = config.nix.envVars // {
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inherit (config.environment.sessionVariables) NIX_PATH;
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HOME = "/root";
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} // config.networking.proxy.envVars;
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path = with pkgs; [
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coreutils
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gnutar
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xz.bin
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gzip
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gitMinimal
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config.nix.package.out
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config.programs.ssh.package
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];
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script = let
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nixos-rebuild = "${config.system.build.nixos-rebuild}/bin/nixos-rebuild";
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date = "${pkgs.coreutils}/bin/date";
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readlink = "${pkgs.coreutils}/bin/readlink";
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shutdown = "${pkgs.systemd}/bin/shutdown";
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upgradeFlag = optional (cfg.channel == null) "--upgrade";
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in if cfg.allowReboot then ''
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${nixos-rebuild} boot ${toString (cfg.flags ++ upgradeFlag)}
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booted="$(${readlink} /run/booted-system/{initrd,kernel,kernel-modules})"
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built="$(${readlink} /nix/var/nix/profiles/system/{initrd,kernel,kernel-modules})"
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${optionalString (cfg.rebootWindow != null) ''
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current_time="$(${date} +%H:%M)"
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lower="${cfg.rebootWindow.lower}"
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upper="${cfg.rebootWindow.upper}"
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if [[ "''${lower}" < "''${upper}" ]]; then
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if [[ "''${current_time}" > "''${lower}" ]] && \
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[[ "''${current_time}" < "''${upper}" ]]; then
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do_reboot="true"
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else
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do_reboot="false"
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fi
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else
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# lower > upper, so we are crossing midnight (e.g. lower=23h, upper=6h)
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# we want to reboot if cur > 23h or cur < 6h
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if [[ "''${current_time}" < "''${upper}" ]] || \
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[[ "''${current_time}" > "''${lower}" ]]; then
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do_reboot="true"
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else
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do_reboot="false"
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fi
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fi
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''}
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if [ "''${booted}" = "''${built}" ]; then
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${nixos-rebuild} switch ${toString cfg.flags}
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${optionalString (cfg.rebootWindow != null) ''
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elif [ "''${do_reboot}" != true ]; then
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echo "Outside of configured reboot window, skipping."
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''}
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else
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${shutdown} -r +1
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fi
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'' else ''
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${nixos-rebuild} switch ${toString (cfg.flags ++ upgradeFlag)}
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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 =
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cfg.randomizedDelaySec;
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};
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}
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