Fixing minor bugs in IPython.kernel.

* Regular expressions now using raw strings in launcher.py
* Directory permissions on cluster directory handled properly.
* A raw ipcluster start will now create cluster default and add the
  default config files.
* Config files updated to use raw strings where appropriate.

IPython/config/default/ipcluster_config.py

@@ -109,7 +109,7 b' c = get_config()'
 # c.PBSControllerLauncher.delete_command = 'qdel'
 
 # A regular expression that takes the output of qsub and find the job id.
-# c.PBSControllerLauncher.job_id_regexp = '\d+'
+# c.PBSControllerLauncher.job_id_regexp = r'\d+'
 
 # The batch submission script used to start the controller. This is where
 # environment variables would be setup, etc. This string is interpolated using
@@ -129,7 +129,7 b' c = get_config()'
 # c.PBSEngineSetLauncher.delete_command = 'qdel'
 
 # A regular expression that takes the output of qsub and find the job id.
-# c.PBSEngineSetLauncher.job_id_regexp = '\d+'
+# c.PBSEngineSetLauncher.job_id_regexp = r'\d+'
 
 # The batch submission script used to start the engines. This is where
 # environment variables would be setup, etc. This string is interpolated using
@@ -147,7 +147,7 b' c = get_config()'
 
 # c.IPControllerJob.job_name = 'IPController'
 # c.IPControllerJob.is_exclusive = False
-# c.IPControllerJob.username = 'USERDOMAIN\\USERNAME'
+# c.IPControllerJob.username = r'USERDOMAIN\USERNAME'
 # c.IPControllerJob.priority = 'Highest'
 # c.IPControllerJob.requested_nodes = ''
 # c.IPControllerJob.project = 'MyProject'
@@ -163,7 +163,7 b' c = get_config()'
 
 # c.IPEngineSetJob.job_name = 'IPEngineSet'
 # c.IPEngineSetJob.is_exclusive = False
-# c.IPEngineSetJob.username = 'USERDOMAIN\\USERNAME'
+# c.IPEngineSetJob.username = r'USERDOMAIN\USERNAME'
 # c.IPEngineSetJob.priority = 'Highest'
 # c.IPEngineSetJob.requested_nodes = ''
 # c.IPEngineSetJob.project = 'MyProject'

IPython/kernel/clusterdir.py

@@ -69,9 +69,7 b' class ClusterDir(Component):'
 
     def _location_changed(self, name, old, new):
         if not os.path.isdir(new):
-            os.makedirs(new, mode=0777)
-        else:
-            os.chmod(new, 0777)
+            os.makedirs(new)
         self.security_dir = os.path.join(new, self.security_dir_name)
         self.log_dir = os.path.join(new, self.log_dir_name)
         self.pid_dir = os.path.join(new, self.pid_dir_name)
@@ -82,9 +80,7 b' class ClusterDir(Component):'
 
     def check_log_dir(self):
         if not os.path.isdir(self.log_dir):
-            os.mkdir(self.log_dir, 0777)
-        else:
-            os.chmod(self.log_dir, 0777)
+            os.mkdir(self.log_dir)
 
     def _security_dir_changed(self, name, old, new):
         self.check_security_dir()
@@ -92,7 +88,6 b' class ClusterDir(Component):'
     def check_security_dir(self):
         if not os.path.isdir(self.security_dir):
             os.mkdir(self.security_dir, 0700)
-        else:
             os.chmod(self.security_dir, 0700)
 
     def _pid_dir_changed(self, name, old, new):
@@ -101,7 +96,6 b' class ClusterDir(Component):'
     def check_pid_dir(self):
         if not os.path.isdir(self.pid_dir):
             os.mkdir(self.pid_dir, 0700)
-        else:
             os.chmod(self.pid_dir, 0700)
 
     def check_dirs(self):

IPython/kernel/ipclusterapp.py

@@ -208,7 +208,7 b' class IPClusterApp(ApplicationWithClusterDir):'
             self.auto_create_cluster_dir = True
             super(IPClusterApp, self).find_resources()
         elif subcommand=='start' or subcommand=='stop':
-            self.auto_create_cluster_dir = False
+            self.auto_create_cluster_dir = True
             try:
                 super(IPClusterApp, self).find_resources()
             except ClusterDirError:
@@ -257,13 +257,16 b' class IPClusterApp(ApplicationWithClusterDir):'
 
     def construct(self):
         config = self.master_config
-        if config.Global.subcommand=='list':
-            pass
-        elif config.Global.subcommand=='create':
+        subcmd = config.Global.subcommand
+        reset = config.Global.reset_config
+        if subcmd == 'list':
+            return
+        if subcmd == 'create':
             self.log.info('Copying default config files to cluster directory '
-            '[overwrite=%r]' % (config.Global.reset_config,))
-            self.cluster_dir_obj.copy_all_config_files(overwrite=config.Global.reset_config)
-        elif config.Global.subcommand=='start':
+            '[overwrite=%r]' % (reset,))
+            self.cluster_dir_obj.copy_all_config_files(overwrite=reset)
+        if subcmd =='start':
+            self.cluster_dir_obj.copy_all_config_files(overwrite=False)
             self.start_logging()
             reactor.callWhenRunning(self.start_launchers)
 
@@ -410,6 +413,7 b' class IPClusterApp(ApplicationWithClusterDir):'
         self.log.info(
             'Starting ipcluster with [daemon=%r]' % config.Global.daemonize
         )
+        # TODO: Get daemonize working on Windows or as a Windows Server.
         if config.Global.daemonize:
             if os.name=='posix':
                 daemonize()

IPython/kernel/launcher.py

@@ -505,6 +505,7 b' class MPIExecEngineSetLauncher(MPIExecLauncher):'
 # SSH launchers
 #-----------------------------------------------------------------------------
 
+# TODO: Get SSH Launcher working again.
 
 class SSHLauncher(BaseLauncher):
     """A minimal launcher for ssh.
@@ -565,7 +566,7 b' class WindowsHPCLauncher(BaseLauncher):'
 
     # A regular expression used to get the job id from the output of the 
     # submit_command.
-    job_id_regexp = Str('\d+', config=True)
+    job_id_regexp = Str(r'\d+', config=True)
     # The filename of the instantiated job script.
     job_file_name = Unicode(u'ipython_job.xml', config=True)
     # The full path to the instantiated job script. This gets made dynamically
@@ -709,6 +710,7 b' class WindowsHPCEngineSetLauncher(WindowsHPCLauncher):'
 # Batch (PBS) system launchers
 #-----------------------------------------------------------------------------
 
+# TODO: Get PBS launcher working again.
 
 class BatchSystemLauncher(BaseLauncher):
     """Launch an external process using a batch system.
@@ -790,7 +792,7 b' class PBSLauncher(BatchSystemLauncher):'
 
     submit_command = Str('qsub', config=True)
     delete_command = Str('qdel', config=True)
-    job_id_regexp = Str('\d+', config=True)
+    job_id_regexp = Str(r'\d+', config=True)
     batch_template = Str('', config=True)
     batch_file_name = Unicode(u'pbs_batch_script', config=True)
     batch_file = Unicode(u'')