[PATCH] t0005: ksh93 portability workaround

[Junio C Hamano <gitster@pobox.com>]

The test has two things ksh93 does not happy about:

 * It thinks "(( command1; command2 ) | command3)" is a perfectly
   sane way to write a pipeline.  ksh93, unlike other POSIX shells,
   does not like the two open parentheses next to each other for
   whatever reason it has.

 * It adds 256, unlike 128 that are used by other POSIX shells, to
   the signal number that caused the process to die when coming up
   with the exit status.

What is interesting is that we knew about the latter issue and had a
workaround in the test-sigchain test when verifying that SIGTERM
works OK, but we didn't have corresponding workaround for SIGPIPE.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 t/t0005-signals.sh | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/t/t0005-signals.sh b/t/t0005-signals.sh
index e7f27eb..12b4efb 100755
--- a/t/t0005-signals.sh
+++ b/t/t0005-signals.sh
@@ -9,6 +9,16 @@ two
 one
 EOF
 
+died_with_sigpipe () {
+	case "$1" in
+	141 | 269)
+		# POSIX w/ SIGPIPE=13 gives 141
+		# ksh w/ SIGPIPE=13 gives 269
+		true ;;
+	*)	false ;;
+	esac
+}
+
 test_expect_success 'sigchain works' '
 	{ test-sigchain >actual; ret=$?; } &&
 	case "$ret" in
@@ -40,13 +50,13 @@ test_expect_success 'create blob' '
 '
 
 test_expect_success !MINGW 'a constipated git dies with SIGPIPE' '
-	OUT=$( ((large_git; echo $? 1>&3) | :) 3>&1 ) &&
-	test "$OUT" -eq 141
+	OUT=$( ( (large_git; echo $? 1>&3) | :) 3>&1 ) &&
+	died_with_sigpipe "$OUT"
 '
 
 test_expect_success !MINGW 'a constipated git dies with SIGPIPE even if parent ignores it' '
-	OUT=$( ((trap "" PIPE; large_git; echo $? 1>&3) | :) 3>&1 ) &&
-	test "$OUT" -eq 141
+	OUT=$( ( (trap "" PIPE; large_git; echo $? 1>&3) | :) 3>&1 ) &&
+	died_with_sigpipe "$OUT"
 '
 
 test_done