From c57892462bf22e537a2cd5ee5e6f88b0b59a2d33 Mon Sep 17 00:00:00 2001
From: Jan Malakhovski <oxij@oxij.org>
Date: Sun, 23 Sep 2018 15:55:39 +0000
Subject: [PATCH] nixos/networking: add hostname to `/etc/hosts` by default

We use `127.0.1.1` instead of `127.0.0.1` because some applications will fail if
`127.0.0.1` resolves to something other than `localhost`.

Debian does the same.

See #1248 and #36261.
---
 nixos/modules/config/networking.nix | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nixos/modules/config/networking.nix b/nixos/modules/config/networking.nix
index a1ee6a4304a..1eb6fb43604 100644
--- a/nixos/modules/config/networking.nix
+++ b/nixos/modules/config/networking.nix
@@ -215,6 +215,8 @@ in
 
     networking.hosts = {
       "127.0.0.1" = [ "localhost" ];
+    } // optionalAttrs (cfg.hostName != "") {
+      "127.0.1.1" = [ cfg.hostName ];
     } // optionalAttrs cfg.enableIPv6 {
       "::1" = [ "localhost" ];
     };