ref_transaction_commit(): fix atomicity and avoid fd exhaustion

diff --git a/t/t4116-apply-reverse.sh b/t/t4116-apply-reverse.sh
index 1e4d4380bf01c081aeb1df44cef40319063f2faa..ce8567f496438c18501f30632269ecbe7de15fd3 100755 (executable)
--- a/t/t4116-apply-reverse.sh
+++ b/t/t4116-apply-reverse.sh
@@ -30,10 +30,10 @@ test_expect_success setup '
 
 test_expect_success 'apply in forward' '
 
-       T0=`git rev-parse "second^{tree}"` &&
+       T0=$(git rev-parse "second^{tree}") &&
        git reset --hard initial &&
        git apply --index --binary patch &&
-       T1=`git write-tree` &&
+       T1=$(git write-tree) &&
        test "$T0" = "$T1"
 '
 
@@ -62,22 +62,22 @@ test_expect_success 'setup separate repository lacking postimage' '
 
 test_expect_success 'apply in forward without postimage' '
 
-       T0=`git rev-parse "second^{tree}"` &&
+       T0=$(git rev-parse "second^{tree}") &&
        (
                cd initial &&
                git apply --index --binary ../patch &&
-               T1=`git write-tree` &&
+               T1=$(git write-tree) &&
                test "$T0" = "$T1"
        )
 '
 
 test_expect_success 'apply in reverse without postimage' '
 
-       T0=`git rev-parse "initial^{tree}"` &&
+       T0=$(git rev-parse "initial^{tree}") &&
        (
                cd second &&
                git apply --index --binary --reverse ../patch &&
-               T1=`git write-tree` &&
+               T1=$(git write-tree) &&
                test "$T0" = "$T1"
        )
 '