Merge branch 'rj/test-ulimit-on-windows'

On Cygwin, "ulimit -s" does not report failure but it does not work
at all, which causes an unexpected success of some tests that
expect failures under a limited stack situation.  This has been
fixed.

* rj/test-ulimit-on-windows:
t9010-*.sh: skip all tests if the PIPE prereq is missing
test-lib: use more compact expression in PIPE prerequisite
test-lib: don't use ulimit in test prerequisites on cygwin

diff --combined t/test-lib.sh
index 83f5d3dd21bbb7cae8b41bf2404f97bb43979d2c,c730c0bc1399e4d6c4846a4fe8d4afce28f0b51d..9b61f16f7a8807ad96014d79f1d1b968397584bf
--- 1/t/test-lib.sh
--- 2/t/test-lib.sh
+++ b/t/test-lib.sh
@@@ -44,11 -44,6 +44,11 @@@ GIT_BUILD_DIR="$TEST_DIRECTORY"/.
  : ${ASAN_OPTIONS=detect_leaks=0:abort_on_error=1}
  export ASAN_OPTIONS
  
 +# If LSAN is in effect we _do_ want leak checking, but we still
 +# want to abort so that we notice the problems.
 +: ${LSAN_OPTIONS=abort_on_error=1}
 +export LSAN_OPTIONS
 +
  ################################################################
  # It appears that people try to run tests without building...
  "$GIT_BUILD_DIR/git" >/dev/null
@@@ -279,7 -274,7 +279,7 @@@ the
        test -z "$verbose" && verbose_only="$valgrind_only"
  elif test -n "$valgrind"
  then
 -      verbose=t
 +      test -z "$verbose_log" && verbose=t
  fi
  
  if test -n "$color"
@@@ -1067,14 -1062,8 +1067,8 @@@ test_i18ngrep () 
  
  test_lazy_prereq PIPE '
        # test whether the filesystem supports FIFOs
-       case $(uname -s) in
-       CYGWIN*|MINGW*)
-               false
-               ;;
-       *)
-               rm -f testfifo && mkfifo testfifo
-               ;;
-       esac
+       test_have_prereq !MINGW,!CYGWIN &&
+       rm -f testfifo && mkfifo testfifo
  '
  
  test_lazy_prereq SYMLINKS '
@@@ -1170,13 -1159,19 +1164,19 @@@ 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 |