libstore: add explicit in-build-slot-ness to goals

we don't need to expose information about how busy a Worker is if the
worker can instead tell its work items whether they are in a slot. in
the future we might use this to not start items waiting for a slot if
no slots are currently available, but that requires more preparation.

Change-Id: Ibe01ac536da7e6d6f80520164117c43e772f9bd9

1 files changed, 6 insertions, 6 deletions

diff --git a/src/libstore/build/drv-output-substitution-goal.hh b/src/libstore/build/drv-output-substitution-goal.hh
index a28347f15..a660a4f3e 100644
--- a/src/libstore/build/drv-output-substitution-goal.hh
+++ b/src/libstore/build/drv-output-substitution-goal.hh
@@ -58,20 +58,20 @@ class DrvOutputSubstitutionGoal : public Goal {
 public:
     DrvOutputSubstitutionGoal(const DrvOutput& id, Worker & worker, RepairFlag repair = NoRepair, std::optional<ContentAddress> ca = std::nullopt);
 
-    typedef WorkResult (DrvOutputSubstitutionGoal::*GoalState)();
+    typedef WorkResult (DrvOutputSubstitutionGoal::*GoalState)(bool inBuildSlot);
     GoalState state;
 
-    WorkResult init();
-    WorkResult tryNext();
-    WorkResult realisationFetched();
-    WorkResult outPathValid();
+    WorkResult init(bool inBuildSlot);
+    WorkResult tryNext(bool inBuildSlot);
+    WorkResult realisationFetched(bool inBuildSlot);
+    WorkResult outPathValid(bool inBuildSlot);
     WorkResult finished();
 
     Finished timedOut(Error && ex) override { abort(); };
 
     std::string key() override;
 
-    WorkResult work() override;
+    WorkResult work(bool inBuildSlot) override;
 
     JobCategory jobCategory() const override {
         return JobCategory::Substitution;