* Started removing closure store expressions, i.e., the explicit

  representation of closures as ATerms in the Nix store.  Instead, the
  file system pointer graph is now stored in the Nix database.  This
  has many advantages:

  - It greatly simplifies the implementation (we can drop the notion
    of `successors', and so on).

  - It makes registering roots for the garbage collector much easier.
    Instead of specifying the closure expression as a root, you can
    simply specify the store path that must be retained as a root.
    This could not be done previously, since there was no way to find
    the closure store expression containing a given store path.
    
  - Better traceability: it is now possible to query what paths are
    referenced by a path, and what paths refer to a path.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/nix-store/dotgraph.cc b/src/nix-store/dotgraph.cc
index b13846c04..67473a81f 100644
--- a/src/nix-store/dotgraph.cc
+++ b/src/nix-store/dotgraph.cc
@@ -2,6 +2,7 @@
 #include "normalise.hh"
 
 
+#if 0
 static string dotQuote(const string & s)
 {
     return "\"" + s + "\"";
@@ -133,3 +134,4 @@ void printDotGraph(const PathSet & roots)
 
     cout << "}\n";
 }
+#endif