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Support optional sandbox paths

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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.
This commit is contained in:
Eelco Dolstra 2016-10-31 17:09:52 +01:00
parent c4969aebaf
commit 18b7363a69
2 changed files with 32 additions and 10 deletions
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7
doc/manual/command-ref/conf-file.xml
View file

@ -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