diff: introduce diff.submodule configuration variable

diff --git a/t/t4029-diff-trailing-space.sh b/t/t4029-diff-trailing-space.sh
index 9ddbbcde57489e266e2f229314ebac5dbfeb3be6..36e2f075c9f94286a05474b58e7600f2a9de2f20 100755 (executable)
--- a/t/t4029-diff-trailing-space.sh
+++ b/t/t4029-diff-trailing-space.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 #
 # Copyright (c) Jim Meyering
 #
@@ -27,7 +27,7 @@ test_expect_success \
      git config --bool diff.suppressBlankEmpty true &&
      git diff f > actual &&
      test_cmp exp actual &&
-     perl -i.bak -p -e "s/^\$/ /" exp &&
+     "$PERL_PATH" -i.bak -p -e "s/^\$/ /" exp &&
      git config --bool diff.suppressBlankEmpty false &&
      git diff f > actual &&
      test_cmp exp actual &&