env/users: add virtual user support

1 files changed, 95 insertions, 29 deletions

diff --git a/env/users/default.nix b/env/users/default.nix
index 2eaf891..f3be85a 100644
--- a/env/users/default.nix
+++ b/env/users/default.nix
@@ -1,44 +1,110 @@
-{ lib, ... }:
-with lib; {
+{ config, lib, ... }:
+with lib; let
+  cfg = config.local;
+  inherit (config.networking) domain;
+in
+{
   imports = [
     ./mailbox.nix
   ];
 
-  options.local.users = with types; mkOption {
-    default = { };
+  options.local = with types; {
+    sysadmin = mkOption {
+      type = str;
+    };
 
-    type = attrsOf (submodule {
-      options = {
-        uid = mkOption {
-          type = int;
-        };
+    users = mkOption {
+      default = { };
 
-        gid = mkOption {
-          type = int;
-        };
+      type = attrsOf (submodule ({ config, ... }: {
+        options = {
+          uid = mkOption {
+            type = int;
+          };
 
-        gecos = mkOption {
-          type = str;
-          default = "";
-        };
+          gid = mkOption {
+            type = int;
+          };
 
-        groups = mkOption {
-          type = listOf str;
-          default = [ ];
-        };
+          gecos = mkOption {
+            type = str;
+            default = "";
+          };
 
-        allowLogin = mkOption {
-          type = bool;
-          default = true;
+          sysadmin = mkOption {
+            type = bool;
+            default = false;
+          };
+
+          groups = mkOption {
+            type = listOf str;
+            default = [ ];
+          };
+
+          allowLogin = mkOption {
+            type = bool;
+            default = true;
+          };
+
+          hardAliases = mkOption {
+            type = listOf str;
+            default = [ ];
+          };
         };
 
-        hardAliases = mkOption {
-          type = listOf str;
-          default = [ ];
+        config.groups = mkBefore (optional config.sysadmin "wheel");
+      }));
+    };
+
+    virtual = mkOption {
+      default = { };
+
+      type = attrsOf (submodule ({ name, ... }: {
+        options = {
+          aliases = mkOption {
+            type = attrsOf (listOf str);
+            default = { };
+          };
+
+          users = mkOption {
+            type = attrsOf (submodule { });
+            default = { };
+          };
         };
-      };
-    });
+
+        config.aliases =
+          let
+            sysadmin = mkDefault [ "sysadmin@${name}" ];
+          in
+          {
+            abuse = sysadmin;
+            security = sysadmin;
+            webmaster = sysadmin;
+            hostmaster = sysadmin;
+            postmaster = sysadmin;
+
+            sysadmin = mkDefault [ "sysadmin@${domain}" ];
+          };
+      }));
+    };
   };
 
-  config.local.users = import ./users.nix;
+  config.local = mkMerge [
+    {
+      users = import ./users.nix;
+      virtual = import ./virtual.nix;
+
+      sysadmin =
+        (findSingle
+          (user: user.value.sysadmin)
+          (throw "no user is declared as sysadmin")
+          (throw "more than one user is declared as sysadmin")
+          (mapAttrsToList nameValuePair cfg.users)
+        ).name;
+    }
+
+    {
+      virtual.${domain}.aliases.sysadmin = [ cfg.sysadmin ];
+    }
+  ];
 }