From 2a0cf385d26544d80a29ebf7e34f63e86f397283 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Sat, 1 Feb 2020 12:11:22 +0100
Subject: [PATCH] nixos-rebuild: Avoid subshell reading hostname
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Co-Authored-By: Jörg Thalheim <Mic92@users.noreply.github.com>
---
 nixos/modules/installer/tools/nixos-rebuild.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nixos/modules/installer/tools/nixos-rebuild.sh b/nixos/modules/installer/tools/nixos-rebuild.sh
index 8d69bbfd14c..4bbed9e6971 100644
--- a/nixos/modules/installer/tools/nixos-rebuild.sh
+++ b/nixos/modules/installer/tools/nixos-rebuild.sh
@@ -256,7 +256,7 @@ if [[ -n $flake ]]; then
        flakeAttr="${BASH_REMATCH[2]}"
     fi
     if [[ -z $flakeAttr ]]; then
-        hostname=$(cat /proc/sys/kernel/hostname)
+        read -r hostname < /proc/sys/kernel/hostname
         if [[ -z $hostname ]]; then
             hostname=default
         fi