libstore: Start creating LocalDerivationGoal subclasses

LocalDerivationGoal includes a large number of low-level sandboxing
primitives for Darwin and Linux, intermingled with ifdefs.
Start creating platform-specific classes to make it easier to add new
platforms and review platform-specific code.

This change only creates support infrastructure and moves two function,
more functions will be moved in future changes.

Change-Id: I9fc29fa2a7345107d4fc96c46fa90b4eabf6bb89

1 files changed, 16 insertions, 0 deletions

diff --git a/src/libstore/platform/darwin.hh b/src/libstore/platform/darwin.hh
index b7170aa05..0ac7077fb 100644
--- a/src/libstore/platform/darwin.hh
+++ b/src/libstore/platform/darwin.hh
@@ -1,6 +1,7 @@
 #pragma once
 ///@file
 
+#include "build/local-derivation-goal.hh"
 #include "gc-store.hh"
 #include "local-store.hh"
 
@@ -32,4 +33,19 @@ private:
     void findPlatformRoots(UncheckedRoots & unchecked) override;
 };
 
+/**
+ * Darwin-specific implementation of LocalDerivationGoal
+ */
+class DarwinLocalDerivationGoal : public LocalDerivationGoal
+{
+public:
+    using LocalDerivationGoal::LocalDerivationGoal;
+
+private:
+    /**
+     * Set process flags to enter or leave rosetta, then execute the builder
+     */
+    void execBuilder(std::string builder, Strings args, Strings envStrs) override;
+};
+
 }