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1{
2 config,
3 lib,
4 pkgs,
5 ...
6}:
7
8let
9 cfg = config.lass.fetchWallpaper;
10
11 fetchWallpaperScript = pkgs.writers.writeDash "fetchWallpaper" ''
12 set -eufx
13
14 curl -v -s -o wallpaper.tmp -z wallpaper.tmp ${lib.escapeShellArg cfg.url} && cp wallpaper.tmp wallpaper
15 feh --no-fehbg --bg-scale wallpaper
16 '';
17
18in
19{
20 options.lass.fetchWallpaper = {
21 enable = lib.mkEnableOption "fetch wallpaper";
22 url = lib.mkOption {
23 type = lib.types.str;
24 };
25 timerConfig = lib.mkOption {
26 type = lib.types.unspecified;
27 default = {
28 OnCalendar = "*:00,10,20,30,40,50";
29 };
30 };
31 display = lib.mkOption {
32 type = lib.types.str;
33 default = ":${toString config.services.xserver.display}";
34 };
35 unitConfig = lib.mkOption {
36 type = lib.types.attrsOf lib.types.str;
37 description = "Extra unit configuration for fetchWallpaper to define conditions and assertions for the unit";
38 example = lib.literalExample ''
39 # do not start when running on umts
40 { ConditionPathExists = "!/var/run/ppp0.pid"; }
41 '';
42 default = { };
43 };
44 };
45
46 config = lib.mkIf cfg.enable {
47 systemd.timers.fetchWallpaper = {
48 description = "fetch wallpaper timer";
49 wantedBy = [ "timers.target" ];
50
51 timerConfig = cfg.timerConfig;
52 };
53 systemd.services.fetchWallpaper = {
54 description = "fetch wallpaper";
55 after = [ "network.target" ];
56
57 path = with pkgs; [
58 curl
59 feh
60 ];
61
62 environment = {
63 URL = cfg.url;
64 DISPLAY = cfg.display;
65 };
66 restartIfChanged = true;
67
68 serviceConfig = {
69 Type = "simple";
70 ExecStart = fetchWallpaperScript;
71 StateDirectory = "wallpaper";
72 StateDirectoryMode = "0755";
73 WorkingDirectory = "/var/lib/wallpaper";
74 };
75
76 unitConfig = cfg.unitConfig;
77 };
78
79 users.users.wallpaper = {
80 isSystemUser = true;
81 group = "wallpaper";
82 };
83 users.groups.wallpaper = { };
84 };
85}