reopen_tempfile(): truncate opened file

diff --git a/t/t4029-diff-trailing-space.sh b/t/t4029-diff-trailing-space.sh
index f4e18cb8d3edf01d231976927943959244a4da3a..32b6e9a4e76217d8de771b405dd3ce57c73643ad 100755 (executable)
--- a/t/t4029-diff-trailing-space.sh
+++ b/t/t4029-diff-trailing-space.sh
@@ -6,7 +6,7 @@ test_description='diff honors config option, diff.suppressBlankEmpty'
 
 . ./test-lib.sh
 
-cat <<\EOF > exp ||
+cat <<\EOF >expected ||
 diff --git a/f b/f
 index 5f6a263..8cb8bae 100644
 --- a/f
@@ -20,9 +20,14 @@ exit 1
 
 test_expect_success "$test_description" '
        printf "\nx\n" > f &&
+       before=$(git hash-object f) &&
+       before=$(git rev-parse --short $before) &&
        git add f &&
        git commit -q -m. f &&
        printf "\ny\n" > f &&
+       after=$(git hash-object f) &&
+       after=$(git rev-parse --short $after) &&
+       sed -e "s/^index .*/index $before..$after 100644/" expected >exp &&
        git config --bool diff.suppressBlankEmpty true &&
        git diff f > actual &&
        test_cmp exp actual &&