From 108a6f181afc629d95c18543adc2a4c9d71a55f1 Mon Sep 17 00:00:00 2001
From: grindhold <grindhold@gmx.net>
Date: Tue, 4 Apr 2023 16:45:17 +0200
Subject: [PATCH] nixos/containers: check nixos-container names for underscores

---
 nixos/modules/virtualisation/nixos-containers.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/nixos/modules/virtualisation/nixos-containers.nix b/nixos/modules/virtualisation/nixos-containers.nix
index 669981da5974..2dff65d47bbe 100644
--- a/nixos/modules/virtualisation/nixos-containers.nix
+++ b/nixos/modules/virtualisation/nixos-containers.nix
@@ -509,6 +509,12 @@ in
                                 for details).
                               '';
                             }
+                            {
+                              assertion = !lib.strings.hasInfix "_" name;
+                              message = ''
+                                Names containing underscores are not allowed in nixos-containers. Please rename the container '${name}'
+                              '';
+                            }
                           ];
                         };
                       };