From 18b7363a699c0b5a4bf59d2b320dfc2b84dc4e67 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Mon, 31 Oct 2016 17:09:52 +0100
Subject: Support optional sandbox paths

For example, you can now set

  build-sandbox-paths = /dev/nvidiactl?

to specify that /dev/nvidiactl should only be mounted in the sandbox
if it exists in the host filesystem. This is useful e.g. for EC2
images that should support both CUDA and non-CUDA instances.
---
 doc/manual/command-ref/conf-file.xml | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

(limited to 'doc/manual')

diff --git a/doc/manual/command-ref/conf-file.xml b/doc/manual/command-ref/conf-file.xml
index 69295fafce84..d2c9145e0505 100644
--- a/doc/manual/command-ref/conf-file.xml
+++ b/doc/manual/command-ref/conf-file.xml
@@ -268,7 +268,12 @@ flag, e.g. <literal>--option gc-keep-outputs false</literal>.</para>
     to mount a path in a different location in the sandbox; for
     instance, <literal>/bin=/nix-bin</literal> will mount the path
     <literal>/nix-bin</literal> as <literal>/bin</literal> inside the
-    sandbox.</para>
+    sandbox. If <replaceable>source</replaceable> is followed by
+    <literal>?</literal>, then it is not an error if
+    <replaceable>source</replaceable> does not exist; for example,
+    <literal>/dev/nvidiactl?</literal> specifies that
+    <filename>/dev/nvidiactl</filename> will only be mounted in the
+    sandbox if it exists in the host filesystem.</para>
 
     <para>Depending on how Nix was built, the default value for this option
     may be empty or provide <filename>/bin/sh</filename> as a
-- 
cgit 1.4.1