From 21dac1deee58df80f7b2cd17d661864c8db5d28a Mon Sep 17 00:00:00 2001
From: Ramsay Jones <ramsay@ramsayjones.plus.com>
Date: Thu, 14 Sep 2017 18:24:41 +0100
Subject: test-lib: don't use ulimit in test prerequisites on cygwin

On cygwin (and MinGW), the 'ulimit' built-in bash command does not have
the desired effect of limiting the resources of new processes, at least
for the stack and file descriptors. However, it always returns success
and leads to several test prerequisites being erroneously set to true.

Add a check for cygwin and MinGW to the prerequisite expressions, using
a 'test_have_prereq !MINGW,!CYGWIN' clause, to guard against using ulimit.
This affects the prerequisite expressions for the ULIMIT_STACK_SIZE,
CMDLINE_LIMIT and ULIMIT_FILE_DESCRIPTORS prerequisites.

Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t1400-update-ref.sh b/t/t1400-update-ref.sh
index dc98b4b..664a3a4 100755
--- a/t/t1400-update-ref.sh
+++ b/t/t1400-update-ref.sh
@@ -1253,7 +1253,10 @@ run_with_limited_open_files () {
 	(ulimit -n 32 && "$@")
 }
 
-test_lazy_prereq ULIMIT_FILE_DESCRIPTORS 'run_with_limited_open_files true'
+test_lazy_prereq ULIMIT_FILE_DESCRIPTORS '
+	test_have_prereq !MINGW,!CYGWIN &&
+	run_with_limited_open_files true
+'
 
 test_expect_success ULIMIT_FILE_DESCRIPTORS 'large transaction creating branches does not burst open file limit' '
 (
diff --git a/t/t6120-describe.sh b/t/t6120-describe.sh
index dd6dd9d..3d45dc2 100755
--- a/t/t6120-describe.sh
+++ b/t/t6120-describe.sh
@@ -279,7 +279,6 @@ test_expect_success 'describe ignoring a borken submodule' '
 	grep broken out
 '
 
-# we require ulimit, this excludes Windows
 test_expect_failure ULIMIT_STACK_SIZE 'name-rev works in a deep repo' '
 	i=1 &&
 	while test $i -lt 8000
diff --git a/t/t7004-tag.sh b/t/t7004-tag.sh
index 5bf5ace..b545c33 100755
--- a/t/t7004-tag.sh
+++ b/t/t7004-tag.sh
@@ -1863,7 +1863,6 @@ test_expect_success 'version sort with very long prerelease suffix' '
 	git tag -l --sort=version:refname
 '
 
-# we require ulimit, this excludes Windows
 test_expect_success ULIMIT_STACK_SIZE '--contains and --no-contains work in a deep repo' '
 	>expect &&
 	i=1 &&
diff --git a/t/test-lib.sh b/t/test-lib.sh
index f22c1b2..8a91fb1 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -1165,13 +1165,19 @@ run_with_limited_cmdline () {
 	(ulimit -s 128 && "$@")
 }
 
-test_lazy_prereq CMDLINE_LIMIT 'run_with_limited_cmdline true'
+test_lazy_prereq CMDLINE_LIMIT '
+	test_have_prereq !MINGW,!CYGWIN &&
+	run_with_limited_cmdline true
+'
 
 run_with_limited_stack () {
 	(ulimit -s 128 && "$@")
 }
 
-test_lazy_prereq ULIMIT_STACK_SIZE 'run_with_limited_stack true'
+test_lazy_prereq ULIMIT_STACK_SIZE '
+	test_have_prereq !MINGW,!CYGWIN &&
+	run_with_limited_stack true
+'
 
 build_option () {
 	git version --build-options |
-- 
cgit v0.10.2-6-g49f6