Revert "Restore parent mount namespace before executing a child process"

This reverts commit a0ef21262f4d5652bfb65cfacaec01d89c475a93. This
doesn't work in 'nix run' and nix-shell because setns() fails in
multithreaded programs, and Boehm GC mark threads are uncancellable.

Fixes #2646.

1 files changed, 0 insertions, 10 deletions

diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index d67bddc138c8..bda87bee433e 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -250,7 +250,6 @@ struct ProcessOptions
     bool dieWithParent = true;
     bool runExitHandlers = false;
     bool allowVfork = true;
-    bool restoreMountNamespace = true;
 };
 
 pid_t startProcess(std::function<void()> fun, const ProcessOptions & options = ProcessOptions());
@@ -515,13 +514,4 @@ typedef std::function<bool(const Path & path)> PathFilter;
 extern PathFilter defaultPathFilter;
 
 
-/* Save the current mount namespace. Ignored if called more than
-   once. */
-void saveMountNamespace();
-
-/* Restore the mount namespace saved by saveMountNamespace(). Ignored
-   if saveMountNamespace() was never called. */
-void restoreMountNamespace();
-
-
 }