Add initial tmproot module

flake.nix

@@ -60,6 +60,7 @@
           imports = [ (import path') ];
         }) {
         common = "common.nix";
+        tmproot = "tmproot.nix";
         server = "server.nix";
       };
 

modules/common.nix

@@ -12,19 +12,22 @@
         defaultUsername = "dev";
         uname = config.my.user.name;
       in {
-        my.user = rec {
+        my = {
+          user = {
             name = mkDefault defaultUsername;
             isNormalUser = true;
             uid = mkDefault 1000;
             extraGroups = mkDefault [ "wheel" ];
             password = mkDefault "hunter2"; # TODO: secrets...
           };
+        };
 
         time.timeZone = mkDefault "Europe/Dublin";
 
-        users.mutableUsers = false;
-        users.users.${uname} = mkAliasDefinitions options.my.user;
-        users.groups.${uname}.gid = mkDefault config.users.users.${uname}.uid;
+        users = {
+          mutableUsers = false;
+          users.${uname} = mkAliasDefinitions options.my.user;
+        };
 
         security = {
           sudo.enable = mkDefault false;
@@ -43,11 +46,15 @@
         };
 
         environment.systemPackages = with pkgs; [
+          bash-completion
           vim
+          htop
           iperf3
         ];
 
-        system.stateVersion = "21.11";
-        system.configurationRevision = with inputs; mkIf (self ? rev) self.rev;
+        system = {
+          stateVersion = "21.11";
+          configurationRevision = with inputs; mkIf (self ? rev) self.rev;
+        };
       };
   }

modules/tmproot.nix

@@ -0,0 +1,61 @@
+{ lib, pkgs, inputs, config, ... }:
+  let
+    inherit (lib) concatStringsSep mkIf mkDefault mkAliasDefinitions;
+    inherit (lib.my) mkOpt mkBoolOpt;
+
+    cfg = config.my.tmproot;
+
+    showUnsaved =
+      ''
+        #!${pkgs.python310}/bin/python
+        import stat
+        import sys
+        import os
+
+        ignored = [
+          ${concatStringsSep ",\n  " (map (p: "'${p}'") cfg.ignoreUnsaved)}
+        ]
+
+        base = '/'
+        base_dev = os.stat(base).st_dev
+
+        def recurse(p, link=None):
+          try:
+            for ignore in ignored:
+              if p.startswith(ignore):
+                return
+
+            st = os.lstat(p)
+            if st.st_dev != base_dev:
+              return
+
+            if stat.S_ISLNK(st.st_mode):
+              target = os.path.realpath(p, strict=False)
+              if os.access(target, os.F_OK):
+                recurse(target, link=p)
+                return
+            elif stat.S_ISDIR(st.st_mode):
+              for e in os.listdir(p):
+                recurse(os.path.join(p, e))
+              return
+
+            print(link or p)
+          except PermissionError as ex:
+            print(f'{p}: {ex.strerror}', file=sys.stderr)
+
+        recurse(base)
+      '';
+  in {
+    options.my.tmproot = with lib.types; {
+      enable = mkBoolOpt true;
+      ignoreUnsaved = mkOpt (listOf str) [
+        "/tmp"
+      ];
+    };
+
+    config = mkIf cfg.enable {
+      environment.systemPackages = [
+        (pkgs.writeScriptBin "tmproot-unsaved" showUnsaved)
+      ];
+    };
+  }