ref_transaction_commit(): fix atomicity and avoid fd exhaustion

diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 8bfeef9b0bf6eedcd1f0b31a141efc87a37041f8..d1ff5c94f2f3241b3b1ed436d0011280986abab7 100755 (executable)
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -1180,8 +1180,8 @@ test_expect_success 'message in editor has initial comment: first line' '
 test_expect_success \
        'message in editor has initial comment: remainder' '
        # remove commented lines from the remainder -- should be empty
-       >rest.expect
-       sed -e 1d -e '/^#/d' <actual >rest.actual &&
+       >rest.expect &&
+       sed -e 1d -e "/^#/d" <actual >rest.actual &&
        test_cmp rest.expect rest.actual
 '
 
@@ -1491,10 +1491,10 @@ run_with_limited_stack () {
        (ulimit -s 128 && "$@")
 }
 
-test_lazy_prereq ULIMIT 'run_with_limited_stack true'
+test_lazy_prereq ULIMIT_STACK_SIZE 'run_with_limited_stack true'
 
 # we require ulimit, this excludes Windows
-test_expect_success ULIMIT '--contains works in a deep repo' '
+test_expect_success ULIMIT_STACK_SIZE '--contains works in a deep repo' '
        >expect &&
        i=1 &&
        while test $i -lt 8000