From 1876fb8f1de2c5d8235cded122bd5b2bdbd7e86b Mon Sep 17 00:00:00 2001
From: Stefan Junker <mail@stefanjunker.de>
Date: Sat, 12 Jan 2019 22:30:27 +0100
Subject: [PATCH] nix/os/devices/disk: unset $system before nixos-install

This fixes the nixos-install error

> error: selector 'x86_64-linux' matches no derivations

which is due to $system being set and used by nixos-install.
---
 nix/os/devices/disk.nix | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/nix/os/devices/disk.nix b/nix/os/devices/disk.nix
index ff75d5b..6684521 100644
--- a/nix/os/devices/disk.nix
+++ b/nix/os/devices/disk.nix
@@ -45,7 +45,11 @@ in rec {
     [[ -e "''${NIXOS_CONFIG}" ]]
     [[ -e "${mntRootVol}/nixos" ]]
 
+    sudo -E $SHELL <<EOF
+    # 'having $system set breaks nixos-install'
+    unset system
     nixos-install --max-jobs 5 --cores 4  --no-root-passwd --root ${mntRootVol}/nixos
+    EOF
   '';
 
   diskPrepare = pkgs.writeScript "script" ''