{ config, lib, pkgs, ... }: with import <stockholm/lib>; let cfg = config.krebs.fetchWallpaper; out = { options.krebs.fetchWallpaper = api; config = lib.mkIf cfg.enable imp; }; api = { enable = mkEnableOption "fetch wallpaper"; url = mkOption { type = types.str; }; timerConfig = mkOption { type = types.unspecified; default = { OnCalendar = "*:00,10,20,30,40,50"; }; }; stateDir = mkOption { type = types.str; default = "/var/lib/wallpaper"; }; display = mkOption { type = types.str; default = ":${toString config.services.xserver.display}"; }; unitConfig = mkOption { type = types.attrsOf types.str; description = "Extra unit configuration for fetchWallpaper to define conditions and assertions for the unit"; example = literalExample '' # do not start when running on umts { ConditionPathExists = "!/var/run/ppp0.pid"; } ''; default = {}; }; }; fetchWallpaperScript = pkgs.writeDash "fetchWallpaper" '' set -euf mkdir -p ${cfg.stateDir} chmod o+rx ${cfg.stateDir} cd ${cfg.stateDir} (curl -s -o wallpaper.tmp -z wallpaper.tmp ${shell.escape cfg.url} && cp wallpaper.tmp wallpaper) || : feh --no-fehbg --bg-scale wallpaper ''; imp = { users.users.fetchWallpaper = { name = "fetchWallpaper"; uid = genid_uint31 "fetchWallpaper"; description = "fetchWallpaper user"; group = "fetchWallpaper"; home = cfg.stateDir; createHome = true; isSystemUser = true; }; users.groups.fetchWallpaper = {}; systemd.timers.fetchWallpaper = { description = "fetch wallpaper timer"; wantedBy = [ "timers.target" ]; timerConfig = cfg.timerConfig; }; systemd.services.fetchWallpaper = { description = "fetch wallpaper"; after = [ "network.target" ]; path = with pkgs; [ curl feh ]; environment = { URL = cfg.url; DISPLAY = cfg.display; }; restartIfChanged = true; serviceConfig = { Type = "simple"; ExecStart = fetchWallpaperScript; User = "fetchWallpaper"; }; unitConfig = cfg.unitConfig; }; }; in out