pkgs: { Unit = { Description = "set color temperature of display according to time of day"; Documentation = [ "man:gammastep(1)" ]; BindsTo = [ "sway-session.target" ]; After = [ "sway-session.target" ]; # ConditionEnvironment requires systemd v247 to work correctly ConditionEnvironment = [ "WAYLAND_DISPLAY" ]; }; Service = { Type = "simple"; ExecStart = "${pkgs.gammastep}/bin/gammastep -l geoclue2 -m wayland -v"; }; Install = { WantedBy = [ "sway-session.target" ]; }; }