34435a9502
Before commit54fa0cfe4e, the `redshift` service was run with the environment variable `DISPLAY` set to `:0`. Commit54fa0cfe4echanged this to instead use the value of the `services.xserver.display` configuration option in the value of the `DISPLAY` variable. In so doing, no default value was provided for the case where `services.xserver.display` is `null`. While the default value of `services.xserver.display` is `0`, use of which by the `redshift` module would result in `DISPLAY` again being set to `:0`, `services.xserver.display` may also be `null`, to which value it is set by, e.g., the `lightdm` module. In the case that `services.xserver.display` is `null`, with the change made in commit54fa0cfe4e, the `DISPLAY` variable in the environment of the `redshift` service would be set to `:` (a single colon), which, according to my personal experience, would result in — - the `redshift` service failing to start; and - systemd repeatedly attempting to restart the `redshift` service, looping indefinitely, while the hapless `redshift` spews error messages into the journal. It can be observed that the malformed value of `DISPLAY` is likely at fault for this issue by executing the following commands in an ordinary shell, with a suitable `redshift` executable, and the X11 display not already tinted: - `redshift -O 2500` — This command should reduce the color temperature of the display (making it more reddish). - `DISPLAY=':' redshift -O 6500` — This command should raise the color temperature back up, were it not for the `DISPLAY` environment variable being set to `:` for it, which should cause it to, instead, fail with several error messages. This commit attempts to fix this issue by having the `DISPLAY` environment variable for the `redshift` service default to its old value of `:0` in the case that `services.xserver.display` is `null`. I have tested this solution on NixOS, albeit without the benefit of a system with multiple displays.
120 lines
3 KiB
Nix
120 lines
3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.redshift;
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in {
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options.services.redshift = {
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enable = mkOption {
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type = types.bool;
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default = false;
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example = true;
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description = ''
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Enable Redshift to change your screen's colour temperature depending on
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the time of day.
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'';
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};
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latitude = mkOption {
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type = types.str;
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description = ''
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Your current latitude, between
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<literal>-90.0</literal> and <literal>90.0</literal>.
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'';
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};
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longitude = mkOption {
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type = types.str;
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description = ''
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Your current longitude, between
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between <literal>-180.0</literal> and <literal>180.0</literal>.
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'';
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};
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temperature = {
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day = mkOption {
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type = types.int;
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default = 5500;
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description = ''
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Colour temperature to use during the day, between
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<literal>1000</literal> and <literal>25000</literal> K.
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'';
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};
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night = mkOption {
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type = types.int;
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default = 3700;
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description = ''
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Colour temperature to use at night, between
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<literal>1000</literal> and <literal>25000</literal> K.
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'';
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};
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};
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brightness = {
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day = mkOption {
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type = types.str;
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default = "1";
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description = ''
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Screen brightness to apply during the day,
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between <literal>0.1</literal> and <literal>1.0</literal>.
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'';
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};
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night = mkOption {
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type = types.str;
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default = "1";
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description = ''
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Screen brightness to apply during the night,
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between <literal>0.1</literal> and <literal>1.0</literal>.
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'';
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};
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};
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package = mkOption {
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type = types.package;
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default = pkgs.redshift;
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defaultText = "pkgs.redshift";
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description = ''
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redshift derivation to use.
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'';
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};
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extraOptions = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "-v" "-m randr" ];
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description = ''
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Additional command-line arguments to pass to
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<command>redshift</command>.
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'';
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};
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};
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config = mkIf cfg.enable {
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systemd.user.services.redshift = {
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description = "Redshift colour temperature adjuster";
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wantedBy = [ "default.target" ];
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serviceConfig = {
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ExecStart = ''
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${cfg.package}/bin/redshift \
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-l ${cfg.latitude}:${cfg.longitude} \
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-t ${toString cfg.temperature.day}:${toString cfg.temperature.night} \
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-b ${toString cfg.brightness.day}:${toString cfg.brightness.night} \
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${lib.strings.concatStringsSep " " cfg.extraOptions}
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'';
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RestartSec = 3;
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Restart = "always";
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};
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environment = {
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DISPLAY = ":${toString (
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let display = config.services.xserver.display;
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in if display != null then display else 0
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)}";
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};
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};
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};
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}
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