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diff --git a/ipalib/constants.py b/ipalib/constants.py
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+++ b/ipalib/constants.py
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+# Authors:
+#   Martin Nagy <mnagy@redhat.com>
+#   Jason Gerard DeRose <jderose@redhat.com>
+#
+# Copyright (C) 2008  Red Hat
+# see file 'COPYING' for use and warranty information
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; version 2 only
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+"""
+All constants centralised in one file.
+"""
+
+# The parameter system treats all these values as None:
+NULLS = (None, '', u'', tuple(), [])
+
+# regular expression NameSpace member names must match:
+NAME_REGEX = r'^[a-z][_a-z0-9]*[a-z0-9]$'
+
+# Format for ValueError raised when name does not match above regex:
+NAME_ERROR = 'name must match %r; got %r'
+
+# Standard format for TypeError message:
+TYPE_ERROR = '%s: need a %r; got %r (a %r)'
+
+# Stardard format for TypeError message when a callable is expected:
+CALLABLE_ERROR = '%s: need a callable; got %r (which is a %r)'
+
+# Standard format for StandardError message when overriding an attribute:
+OVERRIDE_ERROR = 'cannot override %s.%s value %r with %r'
+
+# Standard format for AttributeError message when a read-only attribute is
+# already locked:
+SET_ERROR = 'locked: cannot set %s.%s to %r'
+DEL_ERROR = 'locked: cannot delete %s.%s'
+
+# Used for a tab (or indentation level) when formatting for CLI:
+CLI_TAB = '  '  # Two spaces
+
+# The section to read in the config files, i.e. [global]
+CONFIG_SECTION = 'global'
+
+
+# Log format for console output
+LOG_FORMAT_STDERR = ': '.join([
+    '%(name)s',
+    '%(levelname)s',
+    '%(message)s',
+])
+
+
+# Log format for console output when env.dubug is True:
+LOG_FORMAT_STDERR_DEBUG = ' '.join([
+    '%(levelname)s',
+    '%(message)r',
+    '%(lineno)d',
+    '%(filename)s',
+])
+
+
+# Tab-delimited log format for file (easy to opened in a spreadsheet):
+LOG_FORMAT_FILE = '\t'.join([
+    '%(asctime)s',
+    '%(levelname)s',
+    '%(message)r', # Using %r for repr() so message is a single line
+    '%(lineno)d',
+    '%(pathname)s',
+])
+
+
+# The default configuration for api.env
+# This is a tuple instead of a dict so that it is immutable.
+# To create a dict with this config, just "d = dict(DEFAULT_CONFIG)".
+DEFAULT_CONFIG = (
+    # Domain, realm, basedn:
+    ('domain', 'example.com'),
+    ('realm', 'EXAMPLE.COM'),
+    ('basedn', 'dc=example,dc=com'),
+
+    # LDAP containers:
+    ('container_accounts', 'cn=accounts'),
+    ('container_user', 'cn=users,cn=accounts'),
+    ('container_group', 'cn=groups,cn=accounts'),
+    ('container_service', 'cn=services,cn=accounts'),
+    ('container_host', 'cn=computers,cn=accounts'),
+    ('container_hostgroup', 'cn=hostgroups,cn=accounts'),
+    ('container_automount', 'cn=automount'),
+
+    # Ports, hosts, and URIs:
+    ('lite_xmlrpc_port', 8888),
+    ('lite_webui_port', 9999),
+    ('xmlrpc_uri', 'http://localhost:8888'),
+    ('ldap_uri', 'ldap://localhost:389'),
+    ('ldap_host', 'localhost'),
+    ('ldap_port', 389),
+
+    # Debugging:
+    ('verbose', False),
+    ('debug', False),
+    ('mode', 'production'),
+
+    # Logging:
+    ('log_format_stderr', LOG_FORMAT_STDERR),
+    ('log_format_stderr_debug', LOG_FORMAT_STDERR_DEBUG),
+    ('log_format_file', LOG_FORMAT_FILE),
+
+    # ********************************************************
+    #  The remaining keys are never set from the values here!
+    # ********************************************************
+    #
+    # Env.__init__() or Env._bootstrap() or Env._finalize_core()
+    # will have filled in all the keys below by the time DEFAULT_CONFIG
+    # is merged in, so the values below are never actually used. They are
+    # listed both to provide a big picture and also so DEFAULT_CONFIG contains
+    # at least all the keys that should be present after Env._finalize_core()
+    # is called.
+    #
+    # Each environment variable below is sent to ``object``, which just happens
+    # to be an invalid value for an environment variable, so if for some reason
+    # any of these keys were set from the values here, an exception will be
+    # raised.
+
+    # Set in Env.__init__():
+    ('ipalib', object), # The directory containing ipalib/__init__.py
+    ('site_packages', object), # The directory contaning ipalib
+    ('script', object), # sys.argv[0]
+    ('bin', object), # The directory containing script
+    ('home', object), # The home directory of user underwhich process is running
+    ('dot_ipa', object), # ~/.ipa directory
+
+    # Set in Env._bootstrap():
+    ('in_tree', object), # Whether or not running in-tree (bool)
+    ('context', object), # Name of context, default is 'default'
+    ('conf', object), # Path to config file
+    ('conf_default', object), # Path to common default config file
+    ('conf_dir', object), # Directory containing config files
+
+    # Set in Env._finalize_core():
+    ('in_server', object), # Whether or not running in-server (bool)
+    ('log', object), # Path to log file
+
+)