fix(nix/runTestsuite): don't crash on big test suites r/3093

Having `prettyRes` in the execline script causes it to fail because of
the argv limit if your test suite is long enough. For the succeeding one
we can work around this by hashing it (since we only care that something
changes if the test suite changes), in the case of the failing one where
we want to print the results, we use runExecline's stdin mechanism.

Change-Id: I2489f76acfbe809351f51caefe2a477328a70ee3

1 files changed, 9 insertions, 8 deletions

diff --git a/nix/runTestsuite/default.nix b/nix/runTestsuite/default.nix
index f9a156047928..9eb507099678 100644
--- a/nix/runTestsuite/default.nix
+++ b/nix/runTestsuite/default.nix
@@ -38,7 +38,7 @@ let
     ;
 
   bins = depot.nix.getBins pkgs.coreutils [ "printf" ]
-      // depot.nix.getBins pkgs.s6-portable-utils [ "s6-touch" "s6-false" ];
+      // depot.nix.getBins pkgs.s6-portable-utils [ "s6-touch" "s6-false" "s6-cat" ];
 
   # Returns true if the given expression throws when `deepSeq`-ed
   throws = expr:
@@ -153,17 +153,18 @@ let
         then depot.nix.runExecline.local "testsuite-${name}-successful" {} [
           "importas" "out" "out"
           # force derivation to rebuild if test case list changes
-          "ifelse" [ bins.s6-false ] [ bins.printf "" prettyRes ]
+          "ifelse" [ bins.s6-false ] [
+            bins.printf "" (builtins.hashString "sha512" prettyRes)
+          ]
           "if" [ bins.printf "%s\n" "testsuite ${name} successful!" ]
           bins.s6-touch "$out"
         ]
-        else depot.nix.runExecline.local "testsuite-${name}-failed" {} [
+        else depot.nix.runExecline.local "testsuite-${name}-failed" {
+          stdin = prettyRes + "\n";
+        } [
           "importas" "out" "out"
-          "if" [
-            bins.printf "%s\n%s\n"
-              "testsuite ${name} failed!"
-              prettyRes
-          ]
+          "if" [ bins.printf "%s\n" "testsuite ${name} failed!" ]
+          "if" [ bins.s6-cat ]
           "exit" "1"
         ]);