1 files changed, 7 insertions, 4 deletions
diff --git a/Biz/Bild/Builder.nix b/Biz/Bild/Builder.nix
index 214c110..2b1403a 100644
--- a/Biz/Bild/Builder.nix
+++ b/Biz/Bild/Builder.nix
@@ -59,10 +59,13 @@ in {
     buildInputs = sysdeps_;
     checkInputs = [(private.pythonWith (p: with p; [black mypy pylint]))];
     checkPhase = ''
-      black --quiet --exclude 'setup\.py$' --check .
-      pylint --errors-only .
-      mypy --strict --no-error-summary --exclude 'setup\.py$' .
-      python -m ${main} test
+      check() {
+        $@ || { echo "fail:  $name:  $3"; exit 1; }
+      }
+      check python -m black --quiet --exclude 'setup\.py$' --check .
+      check python -m pylint --errors-only .
+      check python -m mypy --strict --no-error-summary --exclude 'setup\.py$' .
+      check python -m ${main} test
     '';
     preBuild = ''
       # initialize possibly-empty subdirectories as python modules