From b8a19ca2bcff1de182bc7d161afe54de8985b31f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Thalheim?= <joerg@thalheim.io>
Date: Wed, 12 Aug 2020 06:52:32 +0100
Subject: [PATCH] nixos-rebuild: add --impure flag

There are two use case for this flag:

1. NixOS developer usually use a nixpkgs checkout for development.
Copying nixpkgs everytime when rebuilding NixOS is way to slow, even
with NVME disks.

2. Folks migrating from impure configuration in a sufficient complex
infrastructure need this flag to gradually migrate to NixOS flakes.
---
 nixos/doc/manual/man-nixos-rebuild.xml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nixos/doc/manual/man-nixos-rebuild.xml b/nixos/doc/manual/man-nixos-rebuild.xml
index 2ab5f006b06b..4510fdd44225 100644
--- a/nixos/doc/manual/man-nixos-rebuild.xml
+++ b/nixos/doc/manual/man-nixos-rebuild.xml
@@ -121,6 +121,9 @@
    <arg>
     <option>--no-net</option>
    </arg>
+   <arg>
+    <option>--impure</option>
+   </arg>
    <arg>
     <group choice='req'>
      <arg choice='plain'><option>--verbose</option></arg>
@@ -597,6 +600,10 @@
    <option>--keep-failed</option> / <option>-K</option>,
    <option>--keep-going</option> / <option>-k</option> and <option>--verbose</option> /
    <option>-v</option>. See the Nix manual for details.
+
+   The following Nix flags that are support by the upcoming nix 2.4 version:
+   <option>-L</option>, <option>--refresh</option>, <option>--no-net</option>,
+   <option>--no-net</option>, <option>--impure</option>. See <command>nix --help</command> or <command>nix build --help</command> for details.
   </para>
  </refsection>