Revert "Enable sandbox builds on Linux by default"

This reverts commit ddc58e7896.

https://hydra.nixos.org/eval/1435322

doc/manual/release-notes/rl-2.0.xml

@@ -809,10 +809,6 @@ configureFlags = "--prefix=${placeholder "out"} --includedir=${placeholder "dev"
 
 <itemizedlist>
 
-  <listitem>
-    <para>Sandbox builds are now enabled by default on Linux.</para>
-  </listitem>
-
   <listitem>
     <para>Values such as Booleans, integers, (nested) lists and
     attribute sets can <link

src/libstore/globals.hh

@@ -220,13 +220,7 @@ public:
     Setting<bool> enableNativeCode{this, false, "allow-unsafe-native-code-during-evaluation",
         "Whether builtin functions that allow executing native code should be enabled."};
 
-    Setting<SandboxMode> sandboxMode{this,
-        #if __linux__
-          smEnabled
-        #else
-          smDisabled
-        #endif
-        , "sandbox",
+    Setting<SandboxMode> sandboxMode{this, smDisabled, "sandbox",
         "Whether to enable sandboxed builds. Can be \"true\", \"false\" or \"relaxed\".",
         {"build-use-chroot", "build-use-sandbox"}};