l: add acl module

lass/3modules/acl.nix

@@ -0,0 +1,64 @@
+{ config, lib, pkgs, ... }: let
+  generateACLs = attrs:
+    lib.mapAttrsToList (path: rules: pkgs.writeDash "acl-${builtins.baseNameOf path}" ''
+      mkdir -p "${path}"
+      ${generateRules rules path}
+    '') attrs;
+
+  generateRules = rules: path:
+    lib.concatStrings (
+      lib.mapAttrsToList (_: rule: ''
+        setfacl -${lib.optionalString rule.recursive "R"}m ${rule.rule} ${path}
+        ${lib.optionalString rule.default "setfacl -${lib.optionalString rule.recursive "R"}dm ${rule.rule} ${path}"}
+        ${lib.optionalString rule.parents (lib.concatMapStringsSep "\n" (folder: "setfacl -m ${rule.rule} ${folder}") (parents path))}
+      '') rules
+    );
+
+  parents = dir:
+    if dir == "/" then
+      [ dir ]
+    else
+      [ dir ] ++ parents (builtins.dirOf dir)
+    ;
+in {
+  options.lass.acl = lib.mkOption {
+    type = lib.types.attrsOf (lib.types.attrsOf (lib.types.submodule ({ config, ... }: {
+      options = {
+        rule = lib.mkOption {
+          type = lib.types.str;
+          default = config._module.args.name;
+        };
+        default = lib.mkOption {
+          type = lib.types.bool;
+          default = !config.parents;
+        };
+        recursive = lib.mkOption {
+          type = lib.types.bool;
+          default = !config.parents;
+        };
+        parents = lib.mkOption {
+          type = lib.types.bool;
+          default = false;
+          description = ''
+            apply ACL to every parent folder
+          '';
+        };
+      };
+    })));
+    default = {};
+  };
+  config = lib.mkIf (config.lass.acl != {}) {
+    systemd.services.set_acl = {
+      wantedBy = [ "multi-user.target" ];
+      path = [
+        pkgs.acl
+        pkgs.coreutils
+      ];
+      serviceConfig = {
+        ExecStart = generateACLs config.lass.acl;
+        RemainAfterExit = true;
+        Type = "oneshot";
+      };
+    };
+  };
+}

lass/3modules/default.nix

@@ -1,6 +1,7 @@
 _:
 {
   imports = [
+    ./acl.nix
     ./dnsmasq.nix
     ./folderPerms.nix
     ./hosts.nix