first attempt at nas rtorrent service

inspired by 7cf0d801d0
and also by https://www.krank.se/2014/06/25/rtorrent-magic-moving-finished-torrents-based-on-labels/

nix/home/programs/flood/default.nix

@@ -33,17 +33,5 @@
       wantedBy = [ "multi-user.target" ];
       after = [ "network.target" ];
     };
-
-#     rtorrent = {
-#       enable = true;
-#       serviceConfig = {
-#         User = "flood";
-#         Type = "forking";
-#         ExecStart = "${pkgs.rtorrent}/bin/rtorrent";
-#         Restart = "on-failure";
-#       };
-#       wantedBy = [ "multi-user.target" ];
-#       after = [ "network.target" ];
-#     };
   };
 }

nix/home/programs/rtorrent/default.nix

@@ -0,0 +1,16 @@
+{ pkgs, finalDir, downloadDir, watchDir }:
+{
+
+  services.rtorrent = {
+    enable = true;
+    downloadDir = downloadDir;
+    group = "users";
+    configText =
+      builtins.readFile (pkgs.substituteAll {
+        src = ./rtorrent.rc;
+        watchDir = watchDir;
+        finalDir = finalDir;
+      });
+  };
+
+}

nix/home/programs/rtorrent/rtorrent.rc

@@ -0,0 +1,41 @@
+# Enable the default ratio group.
+ratio.enable=
+
+# Change the limits, the defaults should be sufficient.
+ratio.min.set = 100
+ratio.max.set = 300
+ratio.upload.set = 20M
+
+# Changing the command triggered when the ratio is reached.
+# (the default is "d.try_close= ; d.ignore_commands.set=1")
+method.set = group.seeding.ratio.command, "d.close= ; d.erase="
+
+# Add new method to get finished dir (called get_finished_dir)
+method.insert = d.get_finished_dir,simple,"cat=@finalDir@/,$d.custom1="
+
+# Bind event "torrent has finished" to action "move to new directory based on label"
+#   method.set_key = event.download.finished,move_complete
+#       Modifies the event.download.finished event to also have a new “key”
+#       called “move_complete”. From what I understand, rTorrent executes all
+#       “keys” in an event whenever that event is fired. The
+#       event.download.finished event fires whenever a torrent has finished
+#       downloading. The stuff within the quotation marks is the new key’s
+#       commands. Each command is separated by a semicolon (;).
+#   d.directory.set=$d.get_finished_dir=;
+#       d.directory.set sets the directory of the torrent in rTorrent’s own
+#       information. It does not move the torrent, just means rTorrent will
+#       look in that directory from now on. $d.get_finished_dir just runs the
+#       get_finished_dir method preciously inserted; constructing a path name
+#       by combining [folder]/finished/ with whatever label was applied
+#       ($d.custom1 contains the label).
+#   execute=mkdir,-p,$d.get_finished_dir=;
+#       Gets the same path name and makes sure the directory actually exists.
+#       Mkdir is the standard *nix command for creating directories. -p means
+#       creating parent directories if needed and not complaining if directory
+#       already exists.
+#   execute=mv,-u,$d.base_path=,$d.get_finished_dir=
+#       Uses the same “execute” functionality as above to run the standard *nix
+#       mv command to move the torrent’s files (whose location is stored in
+#       d.base_path) to, once again, the directory whose name was constructed
+#       by the get_finished_dir method.
+method.set_key = event.download.finished,move_complete,"d.directory.set=$d.get_finished_dir=;execute=mkdir,-p,$d.get_finished_dir=;execute=mv,-u,$d.base_path=,$d.get_finished_dir="