* In `nix-env -i|-u|-e', lock the profile to prevent races between

  concurrent nix-env operations on the same profile.  Fixes NIX-7.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/libstore/pathlocks.hh b/src/libstore/pathlocks.hh
index 42ebe58df..2fd0e0d1e 100644
--- a/src/libstore/pathlocks.hh
+++ b/src/libstore/pathlocks.hh
@@ -18,8 +18,10 @@ private:
 
 public:
     PathLocks();
-    PathLocks(const PathSet & paths);
-    void lockPaths(const PathSet & _paths);
+    PathLocks(const PathSet & paths,
+        const string & waitMsg = "");
+    void lockPaths(const PathSet & _paths,
+        const string & waitMsg = "");
     ~PathLocks();
     void setDeletion(bool deletePaths);
 };