Use cross-platform 'ps' for test_multiprocessing

This fixes _get_children() on OS X.

bug 1205367

Change-Id: I296ea18dbd601f18fe7367b42bf5aecd9ccf9646

glance/tests/functional/v1/test_multiprocessing.py

@@ -18,6 +18,7 @@
 import time
 
 import httplib2
+import psutil
 
 from glance.tests import functional
 from glance.tests.utils import execute
@@ -44,11 +45,11 @@ class TestMultiprocessing(functional.FunctionalTest):
 
     def _get_children(self):
         api_pid = self.api_server.process_pid
-        cmd = ("ps --no-headers --ppid %s -o pid,cmd | "
-               "grep python | "  # NOTE(markwash): ignore non-python procs
-               "awk '{print $1; print >> \"/dev/stderr\"}'" % api_pid)
-        _, out, err = execute(cmd, raise_error=True)
-        return out.strip().split('\n')
+        process = psutil.Process(api_pid)
+
+        children = process.get_children()
+        pids = [str(child.pid) for child in children]
+        return pids
 
     def test_interrupt_avoids_respawn_storm(self):
         """

tools/test-requires

@@ -18,6 +18,7 @@ nosehtmloutput>=0.0.3
 sphinx>=1.1.2
 requests
 testtools>=0.9.22
+psutil<1.0
 
 # Optional packages that should be installed when testing
 MySQL-python