resiliencytestsuite: add logs to know errors when switching to clone

slapos/resiliencytest/suites/resiliencytestsuite.py

@@ -179,14 +179,20 @@ class ResiliencyTestSuite(object):
           os.path.dirname(sys.argv[0]),
           '..', '..', '..', 'slapos.cfg'
       )
+      import os
+      slapos_configuration_file_path = os.path.abspath(slapos_configuration_file_path)
       # Output is huge and we don't want to store it in memory nor print it
       devnull = open('/dev/null', 'w')
       command = ['/opt/slapos/bin/slapos', 'node', 'instance',
                  '--cfg=%s' % slapos_configuration_file_path,
                  '--pidfile=slapos.pid']
-      subprocess.Popen(command, stdout=devnull, stderr=devnull).wait()
-      subprocess.Popen(command, stdout=devnull, stderr=devnull).wait()
-      subprocess.Popen(command, stdout=devnull, stderr=devnull).wait()
+      self.logger.info('Running "slapos node instance" with command : %s' % ' '.join(command))
+      stdin, stdout = subprocess.Popen(command, stdout=devnull, stderr=stderr).wait()
+      stdin, stdout = subprocess.Popen(command, stdout=devnull, stderr=stderr).wait()
+      stdin, stdout = subprocess.Popen(command, stdout=devnull, stderr=stderr).wait()
+      if stdout:
+        print "Erreur when running slapos node instance :"
+        print stderr
 
     success = self.checkDataOnCloneInstance()
     if success: