* A better test case for Nix race conditions.

testpkgs/slow2/slow-build.sh

@@ -0,0 +1,14 @@
+#! /bin/sh
+
+echo "builder started..."
+
+for i in $(seq 1 30); do
+    echo $i
+    sleep 1
+done
+
+mkdir $out
+
+echo "done" > $out/bla
+
+echo "builder finished"

testpkgs/slow2/slow.fix

@@ -0,0 +1,5 @@
+Package(
+  [ ("name", "slow")
+  , ("build", Relative("slow2/slow-build.sh"))
+  ]
+)