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|
{ config, lib, pkgs, ... }:
with lib;
let cfg = config.system.autoUpgrade;
in {
options = {
system.autoUpgrade = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to periodically upgrade NixOS to the latest
version. If enabled, a systemd timer will run
<literal>nixos-rebuild switch --upgrade</literal> once a
day.
'';
};
flake = mkOption {
type = types.nullOr types.str;
default = null;
example = "github:kloenk/nix";
description = ''
The Flake URI of the NixOS configuration to build.
Disables the option <option>system.autoUpgrade.channel</option>.
'';
};
channel = mkOption {
type = types.nullOr types.str;
default = null;
example = "https://nixos.org/channels/nixos-14.12-small";
description = ''
The URI of the NixOS channel to use for automatic
upgrades. By default, this is the channel set using
<command>nix-channel</command> (run <literal>nix-channel
--list</literal> to see the current value).
'';
};
flags = mkOption {
type = types.listOf types.str;
default = [ ];
example = [
"-I"
"stuff=/home/alice/nixos-stuff"
"--option"
"extra-binary-caches"
"http://my-cache.example.org/"
];
description = ''
Any additional flags passed to <command>nixos-rebuild</command>.
If you are using flakes and use a local repo you can add
<command>[ "--update-input" "nixpkgs" "--commit-lock-file" ]</command>
to update nixpkgs.
'';
};
dates = mkOption {
default = "04:40";
type = types.str;
description = ''
Specification (in the format described by
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>) of the time at
which the update will occur.
'';
};
allowReboot = mkOption {
default = false;
type = types.bool;
description = ''
Reboot the system into the new generation instead of a switch
if the new generation uses a different kernel, kernel modules
or initrd than the booted system.
'';
};
randomizedDelaySec = mkOption {
default = "0";
type = types.str;
example = "45min";
description = ''
Add a randomized delay before each automatic upgrade.
The delay will be chozen between zero and this value.
This value must be a time span in the format specified by
<citerefentry><refentrytitle>systemd.time</refentrytitle>
<manvolnum>7</manvolnum></citerefentry>
'';
};
};
};
config = lib.mkIf cfg.enable {
assertions = [{
assertion = !((cfg.channel != null) && (cfg.flake != null));
message = ''
The options 'system.autoUpgrade.channels' and 'system.autoUpgrade.flake' cannot both be set.
'';
}];
system.autoUpgrade.flags = [ "--no-build-output" ]
++ (if cfg.flake == null then
(if cfg.channel == null then
[ "--upgrade" ]
else [
"-I"
"nixpkgs=${cfg.channel}/nixexprs.tar.xz"
])
else
[ "--flake ${cfg.flake}" ]);
systemd.services.nixos-upgrade = {
description = "NixOS Upgrade";
restartIfChanged = false;
unitConfig.X-StopOnRemoval = false;
serviceConfig.Type = "oneshot";
environment = config.nix.envVars // {
inherit (config.environment.sessionVariables) NIX_PATH;
HOME = "/root";
} // config.networking.proxy.envVars;
path = with pkgs; [
coreutils
gnutar
xz.bin
gzip
gitMinimal
config.nix.package.out
];
script = let
nixos-rebuild =
"${config.system.build.nixos-rebuild}/bin/nixos-rebuild";
in if cfg.allowReboot then ''
${nixos-rebuild} boot ${toString cfg.flags}
booted="$(readlink /run/booted-system/{initrd,kernel,kernel-modules})"
built="$(readlink /nix/var/nix/profiles/system/{initrd,kernel,kernel-modules})"
if [ "$booted" = "$built" ]; then
${nixos-rebuild} switch ${toString cfg.flags}
else
/run/current-system/sw/bin/shutdown -r +1
fi
'' else ''
${nixos-rebuild} switch ${toString cfg.flags}
'';
startAt = cfg.dates;
};
systemd.timers.nixos-upgrade.timerConfig.RandomizedDelaySec =
cfg.randomizedDelaySec;
};
}
|