Print git-diff when pre-commit fails

When pre-commit fails and automatically fixes issues for us in Jenkins
we are not able to see what pre-commit automatically fixed. Adding
--show-diff-on-failure makes pre-commit perform a git-diff immediately
after failing to ensure more useful output is printed to inform the
contributor what changes are needed to pass the check.

Signed-off-by: Thanh Ha <zxiiro@gmail.com>
Change-Id: Ia291e121a0882374e1f13180a237f89bde9be68b

diff --git a/tox.ini b/tox.ini
index 0818f5e..e1646d3 100644 (file)
--- a/tox.ini
+++ b/tox.ini
@@ -48,4 +48,4 @@ deps =
     pre-commit
 commands =
     pre-commit install
-    pre-commit run --all-files
+    pre-commit run --all-files --show-diff-on-failure