Ignore prlimit argument on Windowsmitaka-eolstable/mitaka

The built in 'resource' module is used in order to apply process
resource limits. This is not available on Windows.

For the moment, we'll ignore this argument and log a warning
message. In the future, we may provide a portable implementation
for this feature.

Change-Id: I6a82916eb68fbf8737b45a65f71cae1f835d12d1
Closes-Bug: #1627766
(cherry picked from commit 9ac99b675eae255b660b03d3a1e61599d09f8316)

2 files changed, 32 insertions, 5 deletions

diff --git a/oslo_concurrency/processutils.py b/oslo_concurrency/processutils.py
index 1f46221..f3a51c6 100644
--- a/oslo_concurrency/processutils.py
+++ b/oslo_concurrency/processutils.py
@@ -327,11 +327,16 @@ def execute(*cmd, **kwargs):
     cmd = [str(c) for c in cmd]
 
     if prlimit:
-        args = [sys.executable, '-m', 'oslo_concurrency.prlimit']
-        args.extend(prlimit.prlimit_args())
-        args.append('--')
-        args.extend(cmd)
-        cmd = args
+        if os.name == 'nt':
+            LOG.log(loglevel,
+                    _('Process resource limits are ignored as '
+                      'this feature is not supported on Windows.'))
+        else:
+            args = [sys.executable, '-m', 'oslo_concurrency.prlimit']
+            args.extend(prlimit.prlimit_args())
+            args.append('--')
+            args.extend(cmd)
+            cmd = args
 
     sanitized_cmd = strutils.mask_password(' '.join(cmd))
 
diff --git a/oslo_concurrency/tests/unit/test_processutils.py b/oslo_concurrency/tests/unit/test_processutils.py
index 5c744f5..c058f67 100644
--- a/oslo_concurrency/tests/unit/test_processutils.py
+++ b/oslo_concurrency/tests/unit/test_processutils.py
@@ -884,3 +884,25 @@ class PrlimitTestCase(test_base.BaseTestCase):
             self.assertIn(expected, exc.stderr)
         else:
             self.fail("ProcessExecutionError not raised")
+
+    @mock.patch.object(os, 'name', 'nt')
+    @mock.patch.object(processutils.subprocess, "Popen")
+    def test_prlimit_windows(self, mock_popen):
+        # We want to ensure that process resource limits are
+        # ignored on Windows, in which case this feature is not
+        # supported. We'll just check the command passed to Popen,
+        # which is expected to be unaltered.
+        prlimit = self.limit_address_space()
+        mock_popen.return_value.communicate.return_value = None
+
+        processutils.execute(
+            *self.SIMPLE_PROGRAM,
+            prlimit=prlimit,
+            check_exit_code=False)
+
+        mock_popen.assert_called_once_with(
+            self.SIMPLE_PROGRAM,
+            stdin=mock.ANY, stdout=mock.ANY,
+            stderr=mock.ANY, close_fds=mock.ANY,
+            preexec_fn=mock.ANY, shell=mock.ANY,
+            cwd=mock.ANY, env=mock.ANY)