Eliminate the "store" global variable

Also, move a few free-standing functions into StoreAPI and Derivation.

Also, introduce a non-nullable smart pointer, ref<T>, which is just a
wrapper around std::shared_ptr ensuring that the pointer is never
null. (For reference-counted values, this is better than passing a
"T&", because the latter doesn't maintain the refcount. Usually, the
caller will have a shared_ptr keeping the value alive, but that's not
always the case, e.g., when passing a reference to a std::thread via
std::bind.)

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstore/profiles.cc b/src/libstore/profiles.cc
index da3f7da9d..4903b12f6 100644
--- a/src/libstore/profiles.cc
+++ b/src/libstore/profiles.cc
@@ -74,7 +74,7 @@ static void makeName(const Path & profile, unsigned int num,
 }
 
 
-Path createGeneration(Path profile, Path outPath)
+Path createGeneration(ref<StoreAPI> store, Path profile, Path outPath)
 {
     /* The new generation number should be higher than old the
        previous ones. */
@@ -108,7 +108,7 @@ Path createGeneration(Path profile, Path outPath)
        user environment etc. we've just built. */
     Path generation;
     makeName(profile, num + 1, generation);
-    addPermRoot(*store, outPath, generation, false, true);
+    addPermRoot(store, outPath, generation, false, true);
 
     return generation;
 }