ref_transaction_commit(): fix atomicity and avoid fd exhaustion

diff --git a/t/t4254-am-corrupt.sh b/t/t4254-am-corrupt.sh
index b7da95fac578b58b7405386eb16f4288a253b95f..85716dd6ec566f34f7c4e0b30477bb1531c6030e 100755 (executable)
--- a/t/t4254-am-corrupt.sh
+++ b/t/t4254-am-corrupt.sh
@@ -3,20 +3,19 @@
 test_description='git am with corrupt input'
 . ./test-lib.sh
 
-# Note the missing "+++" line:
-cat > bad-patch.diff <<'EOF'
-From: A U Thor <au.thor@example.com>
-diff --git a/f b/f
-index 7898192..6178079 100644
---- a/f
-@@ -1 +1 @@
--a
-+b
-EOF
-
 test_expect_success setup '
-       test $? = 0 &&
-       echo a > f &&
+       # Note the missing "+++" line:
+       cat >bad-patch.diff <<-\EOF &&
+       From: A U Thor <au.thor@example.com>
+       diff --git a/f b/f
+       index 7898192..6178079 100644
+       --- a/f
+       @@ -1 +1 @@
+       -a
+       +b
+       EOF
+
+       echo a >f &&
        git add f &&
        test_tick &&
        git commit -m initial
@@ -26,17 +25,12 @@ test_expect_success setup '
 #   fatal: unable to write file '(null)' mode 100644: Bad address
 # Also, it had the unwanted side-effect of deleting f.
 test_expect_success 'try to apply corrupted patch' '
-       git am bad-patch.diff 2> actual
-       test $? = 1
+       test_must_fail git am bad-patch.diff 2>actual
 '
 
-cat > expected <<EOF
-fatal: git diff header lacks filename information (line 4)
-EOF
-
 test_expect_success 'compare diagnostic; ensure file is still here' '
-       test $? = 0 &&
-       test -f f &&
+       echo "fatal: git diff header lacks filename information (line 4)" >expected &&
+       test_path_is_file f &&
        test_cmp expected actual
 '