unikernel/duniverse/dune_/doc/reference/config/sandboxing_preference.rst

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+sandboxing_preference
+---------------------
+
+The preferred sandboxing setting. Individual rules may specify different
+preferences. Dune will try to utilize a setting satisfying both conditions.
+
+.. code:: dune
+
+    (sandboxing_preference <setting> <setting> ...)
+
+where each ``<setting>`` can be one of:
+
+- ``none`` disables sandboxing.
+
+- ``hardlink`` uses hard links for sandboxing. This is the default under Linux.
+
+- ``copy`` copies files for sandboxing. This is the default under Windows.
+
+- ``symlink`` uses symbolic links for sandboxing.