Usage of environment variables:


Zope installation

    INSTANCE_HOME

        If an INSTANCE_HOME is defined and has a 'lib/python' sub
        directory, it will be added to the front of the Python path.
        INSTANCE_HOME is usually used to separate the Zope core
        installation from application code and third-party
        modules/products.

        See also: SOFTWARE_HOME


    SOFTWARE_HOME 
        
        The SOFTWARE_HOME usually keeps the directory name of the 
        Zope core installation.

        Order of product initialization:
            
            All Products are initialized in ascending alphabetical order by
            product name, regardless of whether an INSTANCE_HOME exists.
            If two products with the same name exist in both SOFTWARE_HOME
            and INSTANCE_HOME, the order in which they appear in
            Application.Products.__path__ determines whether they are
            loaded first or second.

        See also: INSTANCE_HOME


    ZOPE_HOME

        ZOPE_HOME is the root of the Zope software, where the ZServer
        package, z2.py, and the default import directory may be found.


    FORCE_PRODUCT_LOAD

        This environment variable can be used to force or suppress
        Zope's normal automatic (implicit) product installation. If
        this variable is set, then persistent objects representing Zope
        products are implicitly installed if and only if the environment
        variable has a non-empty value.

        If this environment variable is not set, then products are
        implicitly installed unless the ZEO_CLIENT environment
        variable is set to a non-empty value.

        Here's a table explaining how FORCE_PRODUCT_LOAD and ZEO_CLIENT
        will effect the behavior of product loading:

        FORCE_PRODUCT_LOAD       ZEO_CLIENT     RESULT
        unset                    unset          Products are loaded
        empty string             unset          Products are not loaded
        nonempty string          unset          Products are loaded
        unset                    set            Products are not loaded
        nonempty string          set            Products are loaded
        empty string             set            Products are not loaded

Profiling

    PROFILE_PUBLISHER

        If set, Zope is forced profile every request of the ZPublisher.
        The profiling information is written to the value of the
        PROFILE_PUBLISHER.


SiteAccess

    SUPPRESS_ACCESSRULE

        If set, all SiteRoots are suppressed (used by SiteAccess products).


    SUPPRESS_SITEROOT

        If set, all site access rules are suppressed (used by SiteAccess
        products).



ZEO

    CLIENT_HOME

        CLIENT_HOME allows ZEO clients to easily keep distinct pid and log
        files. This is currently an *experimental* feature. 
 

    ZEO_CLIENT
        
        If you want a persistent client cache which retains cache contents
        across ClientStorage restarts, you need to define the environment
        variable, ZEO_CLIENT, to a unique name for the client.  This is
        needed so that unique cache name files can be computed.  Otherwise,
        the client cache is stored in temporary files which are removed
        when the ClientStorage shuts down.

Debugging and Logging

    EVENT_LOG_FORMAT or STUPID_LOG_FORMAT
        
        Set this variable if you like to customize the output format of
        Zope event logger.  EVENT_LOG_FORMAT is the preferred envvar
        but STUPID_LOG_FORMAT also works.
        

    EVENT_LOG_FILE="path" or STUPID_LOG_FILE="path"

        The event file logger writes Zope logging information to a file.
        It is not very smart about it - it just dumps it to a file and the
        format is not very configurable - hence the name STUPID_LOG_FILE.
        EVENT_LOG_FILE is the preferred envvar but STUPID_LOG_FILE
        also works.

        See also: LOGGING.txt


    EVENT_LOG_SEVERITY <number> or STUPID_LOG_SEVERITY <number>

        If set, Zope logs only messages whose severity is level is
        higher than the specified one.  EVENT_LOG_SEVERITY is the
        preferred envvar but STUPID_LOG_SEVERITY also works.


    ZSYSLOG="/dev/log"

        Setting this environment variable will cause Zope to try and write
        the event log to the named UNIX domain socket (usually '/dev/log').
        This will only work on UNIX.

        See also: LOGGING.txt


    ZSYSLOG_FACILITY="facilityname"

        Setting this environment variable will cause Zope to use the syslog
        logger with the given facility. This environment variable is
        optional and  overrides the default facility "user". This will only
        work on UNIX.

        See also: LOGGING.txt


    ZSYSLOG_SERVER="machine.name:port"

        Setting this environment variable tells Zope to connect a UDP
        socket to machine.name (which can be a name or IP address) and
        'port' which must be an integer.  The default syslogd port is '514'
        but Zope does not pick a sane default, you must specify a port.
        This may change, so check back here in future Zope releases.

        See also: LOGGING.txt

    ZSYSLOG_ACCESS="/dev/log"
    ZSYSLOG_ACCESS_FACILITY="facilityname"
    ZSYSLOG_ACCESS_SERVER="machine.name:port"

        Like ZSYSLOG, ZSYSLOG_FACILITY, and ZSYSLOG_SERVER, but
        controlling the sending of access information to syslog
        (rather than controlling the sending of the event log)

    Z_DEBUG_MODE      "yes" or "no"
    BOBO_DEBUG_MODE   "yes" or "no"  (obsolete)
     
        Run Zope in debug mode if set. Same as -D options (z2.py)


Misc.

    Z_REALM       "your realm"
    BOBO_REALM    "your realm" (obsolete)

        Realm to be used when send HTTP authentication requests to a web
        client. The real string is displayed when the web browser pops up
        the username/password requester


Security related 

    NO_SECURITY

       Unknown. Used by TAL


    ZOPE_SECURITY_POLICY

        If this variable is set to "PYTHON", Zope will use the traditional
        Python based AccessControl implementation. By default and for
        performance reasons Zope will use the cAccessControl module (Zope
        2.5+)


    ZSP_OWNEROUS_SKIP

        If set, will cause the Zope Security Policy to skip checks relating
	to ownership, for servers on which ownership is not important.


    ZSP_AUTHENTICATED_SKIP

        If set, will cause the Zope Security Policy to skip checks relating
	to authentication, for servers which serve only anonymous content.


    DISALLOW_LOCAL_PRODUCTS

        unknown


ZODB related

    ZOPE_DATABASE_QUOTA

        If this variable is set, it should be set to an integer number of
        bytes.  Additions to the database are not allowed if the database
        size exceeds the quota. 


    ZOPE_READ_ONLY

        If this variable is set, then the database is opened in read only
        mode.  If this variable is set to a string parsable by
        DateTime.DateTime, then the database is opened read-only as of the
        time given.  Note that changes made by another process after the
        database has been opened are not visible.

Session related

    ZSESSION_ADD_NOTIFY

    	An optional full Zope path name of a callable object to be set as
        the "script to call on object addition" of the session_data
        transient object container created in temp_folder at startup. 

    ZSESSION_DEL_NOTIFY

    	An optional full Zope path name of a callable object to be set as
        the "script to call on object deletion" of the session_data
        transient object container created in temp_folder at startup. 

    ZSESSION_TIMEOUT_MINS

        The number of minutes to be used as the "data object timeout" of the
        "/temp_folder/session_data" transient object container.

    ZSESSION_OBJECT_LIMIT

        The number of items to use as a "maximum number of subobjects"
        value of the "/temp_folder" session data transient object container.


WebDAV

    WEBDAV_SOURCE_PORT_CLIENTS 

        Setting this variable enables the retrieval of the document source
        through the standard HTTP port instead of the WebDAV port. The value
        of this variable is a regular expression that is matched against
        the user-agent string of the client. 

        Example::
  
            WEBDAV_SOURCE_PORT_CLIENTS="cadaver.*"   enables retrieval
            of the document source for the Cadaver WebDAV client                

Structured Text

    STX_DEFAULT_LEVEL

       Set this variable to change the default level for <Hx> elements.
       The default level is 3.  

DTML

    ZOPE_DTML_REQUEST_AUTOQUOTE

        Set this variable to one of 'no', '0' or 'disabled' to disable
        autoquoting of implicitly retrieved REQUEST data that contain a '<'
        when used in a dtml-var construction. When *not* set to one of these
        values, all data implicitly taken from the REQUEST (as oposed to
        addressing REQUEST.varname directly), that contain a '<', will be
        HTML quoted when interpolated with a <dtml-var> or &dtml-;
        construct.

Esoteric 

    Z_MAX_STACK_SIZE

        This variable allows you to customize the size of the Zope stack
        used by the SecurityManager (default 100).


    FORCE_PRODUCT_RELOAD

        unknown (Shane's Refresh product ???)


