423545fe48
now nix-doc-munge will not introduce whitespace changes when it replaces manpage references with the MD equivalent. no change to the manpage, changes to the HTML manual are whitespace only.
263 lines
8.2 KiB
Nix
263 lines
8.2 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 = lib.mdDoc ''
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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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`nixos-rebuild switch --upgrade` once a
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day.
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'';
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};
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operation = mkOption {
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type = types.enum ["switch" "boot"];
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default = "switch";
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example = "boot";
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description = lib.mdDoc ''
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Whether to run
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`nixos-rebuild switch --upgrade` or run
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`nixos-rebuild boot --upgrade`
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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 = lib.mdDoc ''
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The Flake URI of the NixOS configuration to build.
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Disables the option {option}`system.autoUpgrade.channel`.
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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 = lib.mdDoc ''
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Any additional flags passed to {command}`nixos-rebuild`.
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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" ]`
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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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type = types.str;
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default = "04:40";
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example = "daily";
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description = ''
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How often or when upgrade occurs. For most desktop and server systems
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a sufficient upgrade frequency is once a day.
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The format is described in
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<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>.
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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 = lib.mdDoc ''
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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` 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 chosen 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><manvolnum>7</manvolnum></citerefentry>
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'';
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};
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rebootWindow = mkOption {
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description = lib.mdDoc ''
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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` is enabled.
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The default value of `null` 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 = lib.mdDoc "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 = lib.mdDoc "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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persistent = mkOption {
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default = true;
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type = types.bool;
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example = false;
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description = lib.mdDoc ''
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Takes a boolean argument. If true, the time when the service
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unit was last triggered is stored on disk. When the timer is
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activated, the service unit is triggered immediately if it
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would have been triggered at least once during the time when
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the timer was inactive. Such triggering is nonetheless
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subject to the delay imposed by RandomizedDelaySec=. This is
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useful to catch up on missed runs of the service when the
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system was powered down.
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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 = "${config.systemd.package}/bin/shutdown";
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upgradeFlag = optional (cfg.channel == null) "--upgrade";
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in if cfg.allowReboot then ''
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${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} ${cfg.operation} ${toString cfg.flags}
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${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} ${cfg.operation} ${toString (cfg.flags ++ upgradeFlag)}
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'';
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startAt = cfg.dates;
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after = [ "network-online.target" ];
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wants = [ "network-online.target" ];
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};
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systemd.timers.nixos-upgrade = {
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timerConfig = {
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RandomizedDelaySec = cfg.randomizedDelaySec;
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Persistent = cfg.persistent;
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};
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};
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};
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}
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