ref_transaction_commit(): fix atomicity and avoid fd exhaustion

diff --git a/t/t6200-fmt-merge-msg.sh b/t/t6200-fmt-merge-msg.sh
index 54b5744cc526e172acb79bb204af1800fdceb315..2e2fb0e9572f3d570311470aebf47da37974b8f8 100755 (executable)
--- a/t/t6200-fmt-merge-msg.sh
+++ b/t/t6200-fmt-merge-msg.sh
@@ -194,7 +194,7 @@ test_expect_success '--log=5 with custom comment character' '
 '
 
 test_expect_success 'merge.log=0 disables shortlog' '
-       echo "Merge branch ${apos}left${apos}" >expected
+       echo "Merge branch ${apos}left${apos}" >expected &&
        git -c merge.log=0 fmt-merge-msg <.git/FETCH_HEAD >actual &&
        test_cmp expected actual
 '