libstore: Create platform LocalStore subclasses

This creates new subclasses of LocalStore for each OS to include
platform-specific functionality. Currently this just includes garbage
collector roots but it could be extended to sandboxing as well.

In order to make sure that the generic LocalStore is not accidentally
constructed, its constructor is protected. A Fallback is provided which
implements no functionality except constructors.

Change-Id: I836a28e90b68309873f75afb83e0f1b2e2c89fb3

1 files changed, 18 insertions, 0 deletions

diff --git a/src/libstore/platform.cc b/src/libstore/platform.cc
new file mode 100644
index 000000000..9c389ef55
--- /dev/null
+++ b/src/libstore/platform.cc
@@ -0,0 +1,18 @@
+#include "local-store.hh"
+
+#if __linux__
+#include "platform/linux.hh"
+#else
+#include "platform/fallback.hh"
+#endif
+
+namespace nix {
+std::shared_ptr<LocalStore> LocalStore::makeLocalStore(const Params & params)
+{
+#if __linux__
+    return std::shared_ptr<LocalStore>(new LinuxLocalStore(params));
+#else
+    return std::shared_ptr<LocalStore>(new FallbackLocalStore(params));
+#endif
+}
+}