python-psycopg2 is not installed when using PostgreSQL

[Akihiro Motoki]

When PostgreSQL is enabled, sqlalchemy requires psycopg2, but devstack does not install it automatically.
This results in a failure of stack.sh. (The detail is shown below)

It is better to install psycopg2 python module when installing postgresql package.

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logs/screen-key.2013-08-29-185453.log

(keystone.common.wsgi): 2013-08-29 18:55:51,010 DEBUG wsgi __call__ arg_dict: {}
(keystone.common.wsgi): 2013-08-29 18:55:51,011 ERROR wsgi __call__ No module named psycopg2
Traceback (most recent call last):
  File "/opt/stack/keystone/keystone/common/wsgi.py", line 238, in __call__
    result = method(context, **params)
  File "/opt/stack/keystone/keystone/catalog/controllers.py", line 50, in create_service
    service_id, service_ref)
  File "/opt/stack/keystone/keystone/common/manager.py", line 44, in _wrapper
    return f(*args, **kw)
  File "/opt/stack/keystone/keystone/catalog/backends/sql.py", line 82, in create_service
    session = self.get_session()
  File "/opt/stack/keystone/keystone/common/sql/core.py", line 252, in get_session
    self._engine = self.get_engine()
  File "/opt/stack/keystone/keystone/common/sql/core.py", line 291, in get_engine
    engine = new_engine()
  File "/opt/stack/keystone/keystone/common/sql/core.py", line 278, in new_engine
    engine = sql.create_engine(CONF.sql.connection, **engine_config)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/__init__.py", line 338, in create_engine
    return strategy.create(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/engine/strategies.py", line 64, in create
    dbapi = dialect_cls.dbapi(**dbapi_args)
  File "/usr/lib/python2.7/dist-packages/sqlalchemy/dialects/postgresql/psycopg2.py", line 312, in dbapi
    psycopg = __import__('psycopg2')
ImportError: No module named psycopg2

[Akihiro Motoki (amotoki)]

Sorry this is my mistake.

[yalei wang (yalei-wang)]

got a same problem, and should we add the dependency for psycopg2

[Mahito OGURA (earthdragon77)]

I tried to install devstack with postgresql, however I couldn't get a same problem.
Maybe this ploblem is fixed.