users/services: actually remove the systemd backend

modules/users/default.nix

@@ -6,7 +6,6 @@ let
   path-lib = sane-lib.path;
   serviceType = with lib; types.submodule {
     options = {
-      # these aoptions are mostly copied from systemd. could be improved.
       description = mkOption {
         type = types.str;
       };
@@ -113,15 +112,10 @@ let
       };
 
       services = mkOption {
-        # see: <repo:nixos/nixpkgs:nixos/lib/utils.nix>
-        # type = utils.systemdUtils.types.services;
-        # `utils.systemdUtils.types.services` is nearly what we want, but remove `stage2ServiceConfig`,
-        # as we don't want to force a PATH for every service.
         type = types.attrsOf serviceType;
         default = {};
         description = ''
           services to define for this user.
-          populates files in ~/.config/systemd.
         '';
       };
     };
@@ -129,9 +123,8 @@ let
   defaultUserOptions = with lib; {
     options = userOptions.options // {
       services = mkOption {
-        # type = utils.systemdUtils.types.services;
         # map to listOf attrs so that we can pass through
-        # w/o worrying about merging at this layer
+        # w/o worrying about merging at this layer (TODO: this is probably not necessary with s6)
         type = types.attrsOf (types.coercedTo types.attrs (a: [ a ]) (types.listOf types.attrs));
         default = {};
         inherit (userOptions.options.services) description;
@@ -219,7 +212,6 @@ in
 {
   imports = [
     ./s6-rc.nix
-    ./systemd.nix
   ];
 
   options = with lib; {

modules/users/systemd.nix

@@ -1,66 +0,0 @@
-{ lib, utils, ... }:
-let
-  # see: <repo:nixos/nixpkgs:nixos/lib/utils.nix>
-  # see: <repo:nix-community/home-manager:modules/systemd.nix>
-  mkUnit = serviceName: value: utils.systemdUtils.lib.serviceToUnit serviceName {
-    inherit (value)
-      script
-      wantedBy
-    ;
-    serviceConfig = lib.filterAttrs (_: v: v != null) value.serviceConfig;
-    unitConfig = {
-      After = value.after;
-      Before = value.before;
-      BindsTo = value.bindsTo;
-      Description = value.description;
-      Documentation = value.documentation;
-      Wants = value.wants;
-    };
-    environment = {
-      # clear PATH to allow inheriting it from environment.
-      # otherwise, nixos would force it to `systemd.globalEnvironment.PATH`, which is mostly tools like sed/find/etc.
-      # clearing PATH here allows user services to inherit whatever PATH the graphical session sets
-      # (see `dbus-update-activation-environment` call in ~/.config/sway/config),
-      # which is critical to making it so user services can see user *programs*/packages.
-      #
-      # note that systemd provides no way to *append* to the PATH, only to override it (or not).
-      # nor do they intend to ever support that:
-      # - <https://github.com/systemd/systemd/issues/1082>
-      PATH = null;
-    };
-  };
-in
-{
-  # create fs entries for every service, in the systemd user dir.
-  options.sane.users = with lib; mkOption {
-    type = types.attrsOf (types.submodule ({ config, ...}: {
-      fs = lib.concatMapAttrs
-        (serviceName: value: let
-          cleanName = utils.systemdUtils.lib.mkPathSafeName serviceName;
-          generatedUnit = mkUnit serviceName value;
-          #^ generatedUnit contains keys:
-          # - text
-          # - aliases  (IGNORED)
-          # - wantedBy
-          # - requiredBy
-          # - enabled  (IGNORED)
-          # - overrideStrategy  (IGNORED)
-          # TODO: error if one of the above ignored fields are set
-          symlinkData = {
-            text = generatedUnit.text;
-            targetName = "${cleanName}.service";  # systemd derives unit name from symlink target
-          };
-          serviceEntry = {
-            ".config/systemd/user/${serviceName}.service".symlink = symlinkData;
-          };
-          wants = builtins.map (wantedBy: {
-            ".config/systemd/user/${wantedBy}.wants/${serviceName}.service".symlink = symlinkData;
-          }) generatedUnit.wantedBy;
-        in
-          lib.mergeAttrsList ([ serviceEntry ] ++ wants)
-        )
-        config.services
-      ;
-    }));
-  };
-}