From e85735207c2eb742a5f3601a199d57782b850331 Mon Sep 17 00:00:00 2001
From: Graham Christensen <graham@grahamc.com>
Date: Sat, 10 Mar 2018 09:14:47 -0500
Subject: [PATCH] Only try building attributes which can be evaluated

---
 ofborg/src/tasks/build.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/ofborg/src/tasks/build.rs b/ofborg/src/tasks/build.rs
index a1f9887..80298eb 100644
--- a/ofborg/src/tasks/build.rs
+++ b/ofborg/src/tasks/build.rs
@@ -266,13 +266,21 @@ impl notifyworker::SimpleNotifyWorker for BuildWorker {
             return;
         }
 
-        println!("Got path: {:?}, building", refpath);
+        println!("Got path: {:?}, determining which ones we can build ", refpath);
+        let (can_build, cannot_build) = self.nix.safely_partition_instantiable_attrs(
+            refpath.as_ref(),
+            buildfile,
+            job.attrs.clone(),
+        );
 
+        println!("Can build: {}, Cannot build: {}",
+                 can_build.join(", "),
+                 cannot_build.join(", "));
 
         let cmd = self.nix.safely_build_attrs_cmd(
             refpath.as_ref(),
             buildfile,
-            job.attrs.clone(),
+            can_build.clone(),
         );
 
         actions.log_started();