1 files changed, 80 insertions, 0 deletions
diff --git a/nova/debugger.py b/nova/debugger.py
new file mode 100644
index 0000000000..77ca74188d
--- /dev/null
+++ b/nova/debugger.py
@@ -0,0 +1,80 @@
+# Copyright 2010 United States Government as represented by the
+# Administrator of the National Aeronautics and Space Administration.
+# Copyright 2011 Justin Santa Barbara
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+# NOTE(markmc): this is imported before monkey patching in nova.cmd
+# so we avoid extra imports here
+
+import sys
+
+
+def enabled():
+    return ('--remote_debug-host' in sys.argv and
+            '--remote_debug-port' in sys.argv)
+
+
+def register_cli_opts():
+    from oslo.config import cfg
+
+    cli_opts = [
+        cfg.StrOpt('host',
+                    help='Debug host (IP or name) to connect. Note '
+                        'that using the remote debug option changes how '
+                        'Nova uses the eventlet library to support async IO. '
+                        'This could result in failures that do not occur '
+                        'under normal operation. Use at your own risk.'),
+
+        cfg.IntOpt('port',
+                    help='Debug port to connect. Note '
+                        'that using the remote debug option changes how '
+                        'Nova uses the eventlet library to support async IO. '
+                        'This could result in failures that do not occur '
+                        'under normal operation. Use at your own risk.')
+
+    ]
+
+    cfg.CONF.register_cli_opts(cli_opts, 'remote_debug')
+
+
+def init():
+    from oslo.config import cfg
+    CONF = cfg.CONF
+
+    # NOTE(markmc): gracefully handle the CLI options not being registered
+    if 'remote_debug' not in CONF:
+        return
+
+    if not (CONF.remote_debug.host and CONF.remote_debug.port):
+        return
+
+    from nova.openstack.common.gettextutils import _
+    from nova.openstack.common import log as logging
+    LOG = logging.getLogger(__name__)
+
+    LOG.debug(_('Listening on %(host)s:%(port)s for debug connection'),
+              {'host': CONF.remote_debug.host,
+               'port': CONF.remote_debug.port})
+
+    from pydev import pydevd
+    pydevd.settrace(host=CONF.remote_debug.host,
+                    port=CONF.remote_debug.port,
+                    stdoutToServer=False,
+                    stderrToServer=False)
+
+    LOG.warn(_('WARNING: Using the remote debug option changes how '
+               'Nova uses the eventlet library to support async IO. This '
+               'could result in failures that do not occur under normal '
+               'operation. Use at your own risk.'))