Nova API service stuck in endless loop if image_service=nova.image.s3.S3ImageService

Tested that on last bzr837 and several revs before. If you have --image_service=nova.image.s3.S3ImageService defined in /etc/nova/nova.conf than starting nova-api is terminated by Python with "RuntimeError: maximum recursion depth exceeded" error.

Workaroung: change --image_service flag to "nova.image.local.LocalImageService"

Here is /etc/nova/nova.conf:
--verbose=true
--ec2_url=http://10.0.0.1:8773/services/Cloud
--s3_host=10.0.0.1
--cc_host=10.0.0.1
--rabbit_host=10.0.0.1
--sql_connection=mysql://nova:nova@10.0.0.1/nova
--glance_port=9292
--glance_host=127.0.0.1
--use_s3=true
--ajax_console_proxy_url=http://172.16.128.236:8000
--libvirt_type=kvm
--use_syslog=false
--node_availability_zone=z1
--logging_context_format_string=%(asctime)s %(name)s: %(levelname)s [%(request_id)s %(user)s %(project)s] %(message)s
--logging_default_format_string=%(asctime)s %(name)s: %(message)s
--logging_debug_format_suffix=
--use_cow_images=true
--auth_driver=nova.auth.dbdriver.DbDriver
--network_manager=nova.network.manager.VlanManager
--scheduler_driver=nova.scheduler.zone.ZoneScheduler
--image_service=nova.image.s3.S3ImageService
--use_ipv6=false
--ca_path=/var/lib/nova/CA
--keys_path=/var/lib/nova/keys
--images_path=/var/lib/nova/images
--buckets_path=/var/lib/nova/buckets
--instances_path=/var/lib/nova/instances
--networks_path=/var/lib/nova/networks
--dhcpbridge_flagfile=/etc/nova/nova.conf
--dhcpbridge=/usr/bin/nova-dhcpbridge
--injected_network_template=/usr/share/nova/interfaces.rhel.template
--libvirt_xml_template=/usr/share/nova/libvirt.xml.template
--vpn_client_template=/usr/share/nova/client.ovpn.template
--credentials_template=/usr/share/nova/novarc.template
--state_path=/var/lib/nova
--lock_path=/var/lib/nova/tmp

Here is /var/log/nova/nova-api.log:

2011-03-21 13:12:43,492 nova.api: Starting nova-api node (version 2011.2-workspace:tarmac-20110321054627-gg4tik80qhqco96z)
2011-03-21 13:12:43,492 nova.api: Full set of FLAGS:
<<<< SKIPPED TO SAVE SPACE >>>>
2011-03-21 13:12:43,506 nova: Using paste.deploy config at: /etc/nova/api-paste.ini
2011-03-21 13:12:43,511 nova: App Config: ec2
{'/2007-08-29': 'ec2metadata', '/services/Admin': 'ec2admin', '/2007-10-10': 'ec2metadata', '__file__': '/etc/nova/api-paste.ini', '/latest': 'ec2metadata', 'here': '/etc/nova', '/2007-03-01': 'ec2metadata', '/2007-01-19': 'ec2metadata', '/2008-09-01': 'ec2metadata', '/services/Cloud': 'ec2cloud', '/2008-02-01': 'ec2metadata', '/1.0': 'ec2metadata', '/2009-04-04': 'ec2metadata', '/2007-12-15': 'ec2metadata', '/': 'ec2versions'}
2011-03-21 13:12:43,511 nova: Running ec2 API
2011-03-21 13:12:43,619 nova: maximum recursion depth exceeded
(nova): TRACE: Traceback (most recent call last):
(nova): TRACE: File "/usr/bin/nova-api", line 60, in <module>
(nova): TRACE: service = service.serve_wsgi(service.ApiService)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/service.py", line 306, in serve_wsgi
(nova): TRACE: service.start()
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/service.py", line 240, in start
(nova): TRACE: self.wsgi_app = _run_wsgi(self.conf, self.apis)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/service.py", line 321, in _run_wsgi
(nova): TRACE: app = wsgi.load_paste_app(paste_config_file, api)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/wsgi.py", line 559, in load_paste_app
(nova): TRACE: app = deploy.loadapp("config:%s" % filename, name=appname)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 204, in loadapp
(nova): TRACE: return loadobj(APP, uri, name=name, **kw)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 225, in loadobj
(nova): TRACE: return context.create()
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 625, in create
(nova): TRACE: return self.object_type.invoke(self)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 108, in invoke
(nova): TRACE: **context.local_conf)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/deploy/util/fixtypeerror.py", line 57, in fix_call
(nova): TRACE: val = callable(*args, **kw)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/urlmap.py", line 25, in urlmap_factory
(nova): TRACE: app = loader.get_app(app_name, global_conf=global_conf)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 297, in get_app
(nova): TRACE: name=name, global_conf=global_conf).create()
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 625, in create
(nova): TRACE: return self.object_type.invoke(self)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 168, in invoke
(nova): TRACE: app = filter(app)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/wsgi.py", line 212, in _factory
(nova): TRACE: return cls(app, **local_config)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/api/ec2/__init__.py", line 191, in __init__
(nova): TRACE: self.controller = utils.import_class(controller)()
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/api/ec2/cloud.py", line 84, in __init__
(nova): TRACE: self.image_service = s3.S3ImageService()
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/image/s3.py", line 50, in __init__
(nova): TRACE: service = utils.import_object(FLAGS.image_service)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/utils.py", line 75, in import_object
(nova): TRACE: return cls()
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/image/s3.py", line 50, in __init__
(nova): TRACE: service = utils.import_object(FLAGS.image_service)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/utils.py", line 75, in import_object
(nova): TRACE: return cls()

<<<< LOTS OF SAME LINES SKIPPED HERE >>>>

(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/image/s3.py", line 50, in __init__
(nova): TRACE: service = utils.import_object(FLAGS.image_service)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/utils.py", line 75, in import_object
(nova): TRACE: return cls()
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/image/s3.py", line 50, in __init__
(nova): TRACE: service = utils.import_object(FLAGS.image_service)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/nova/flags.py", line 139, in __getattr__
(nova): TRACE: val = gflags.FlagValues.__getattr__(self, name)
(nova): TRACE: File "/usr/lib/python2.6/site-packages/gflags.py", line 884, in __getattr__
(nova): TRACE: fl = self.FlagDict()
(nova): TRACE: RuntimeError: maximum recursion depth exceeded
(nova): TRACE: