* Test case to show that parallel builds of different fixed-output

  derivations that produce the same output path don't work properly
  wrt locking.  This happens a lot in the build farm when fetchurl
  derivations downloading the same file on different platforms are
  executed in parallel and then copied back to the main machine.

1 files changed, 11 insertions, 1 deletions

diff --git a/tests/fixed.nix.in b/tests/fixed.nix.in
index ab2448871d..47eff91e05 100644
--- a/tests/fixed.nix.in
+++ b/tests/fixed.nix.in
@@ -1,6 +1,6 @@
 rec {
 
-  f = builder: mode: algo: hash: derivation {
+  f2 = dummy: builder: mode: algo: hash: derivation {
     name = "fixed";
     system = "@system@";
     builder = "@shell@";
@@ -9,8 +9,11 @@ rec {
     outputHashAlgo = algo;
     outputHash = hash;
     PATH = "@testPath@";
+    inherit dummy;
   };
 
+  f = f2 "";
+
   good = [
     (f ./fixed.builder1.sh "flat" "md5" "8ddd8be4b179a529afa5f2ffae4b9858")
     (f ./fixed.builder1.sh "flat" "sha1" "a0b65939670bc2c010f4d5d6a0b3e4e4590fb92b")
@@ -35,4 +38,11 @@ rec {
     (f ./fixed.builder1.sh "flat" "md5" "ddd8be4b179a529afa5f2ffae4b9858")
   ];
 
+  # Test for building two derivations in parallel that produce the
+  # same output path because they're fixed-output derivations.
+  parallelSame = [
+    (f2 "foo" ./fixed.builder2.sh "flat" "md5" "3670af73070fa14077ad74e0f5ea4e42")
+    (f2 "bar" ./fixed.builder2.sh "flat" "md5" "3670af73070fa14077ad74e0f5ea4e42")
+  ];
+
 }
\ No newline at end of file