* Move addTempRoot() to the store API, and add another function

syncWithGC() to allow clients to register GC roots without needing
  write access to the global roots directory or the GC lock.

src/libstore/gc.hh

@@ -26,12 +26,6 @@ typedef enum {
 void collectGarbage(GCAction action, const PathSet & pathsToDelete,
     bool ignoreLiveness, PathSet & result, unsigned long long & bytesFreed);
 
-/* Register a temporary GC root.  This root will automatically
-   disappear when this process exits.  WARNING: this function should
-   not be called inside a BDB transaction, otherwise we can
-   deadlock. */
-void addTempRoot(const Path & path);
-
 /* Remove the temporary roots file for this process.  Any temporary
    root becomes garbage after this point unless it has been registered
    as a (permanent) root. */