120 lines
3.5 KiB
Nix
120 lines
3.5 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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Shall the system be rebooted if the new configuration
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uses a different kernel, kernel modules or initrd
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than the booted system?
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'';
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};
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};
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};
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config = {
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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=${cfg.channel}/nixexprs.tar.xz" ]);
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systemd.services.nixos-upgrade = {
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description = "NixOS Upgrade";
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restartIfChanged = false;
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unitConfig.X-StopOnRemoval = false;
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serviceConfig.Type = "oneshot";
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environment = config.nix.envVars //
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{ inherit (config.environment.sessionVariables) NIX_PATH;
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HOME = "/root";
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} // config.networking.proxy.envVars;
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path = [ pkgs.gnutar pkgs.xz.bin pkgs.gitMinimal config.nix.package.out ];
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script = ''
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${lib.optionalString cfg.allowReboot ''
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set -euo pipefail
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set -x
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T=$(mktemp -d)
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cd "$T"
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${config.system.build.nixos-rebuild}/bin/nixos-rebuild build ${toString cfg.flags}
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booted="$(${pkgs.coreutils}/bin/readlink /run/booted-system/{initrd,kernel,kernel-modules})"
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built="$(${pkgs.coreutils}/bin/readlink result/{initrd,kernel,kernel-modules})"
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cd /tmp
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rm -rf "$T"
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if [ "$booted" = "$built" ]; then
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${config.system.build.nixos-rebuild}/bin/nixos-rebuild switch ${toString cfg.flags}
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else
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${config.system.build.nixos-rebuild}/bin/nixos-rebuild boot ${toString cfg.flags}
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/run/current-system/sw/bin/shutdown -r +1
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fi
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''}
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${lib.optionalString (!cfg.allowReboot) "${config.system.build.nixos-rebuild}/bin/nixos-rebuild switch ${toString cfg.flags}"}
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'';
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startAt = optional cfg.enable cfg.dates;
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};
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};
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}
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