attic/nix_store: Call initNix before connecting to store

Fixes #22.

attic/build.rs

@@ -95,4 +95,9 @@ fn run_bindgen() {
         .atleast_version("2.4")
         .probe("nix-store")
         .unwrap();
+
+    pkg_config::Config::new()
+        .atleast_version("2.4")
+        .probe("nix-main")
+        .unwrap();
 }

attic/src/nix_store/bindings/nix.cpp

@@ -76,6 +76,7 @@ RString CPathInfo::ca() {
 
 CNixStore::CNixStore() {
 	std::map<std::string, std::string> params;
+	nix::initNix();
 	this->store = nix::openStore("auto", params);
 }
 

attic/src/nix_store/bindings/nix.hpp

@@ -19,6 +19,7 @@
 #include <nix/hash.hh>
 #include <nix/path.hh>
 #include <nix/serialise.hh>
+#include <nix/shared.hh>
 #include <rust/cxx.h>
 
 template<class T> using RVec = rust::Vec<T>;