Allow a site admin to specify additional directories for products as part of

the Zope configuration file.  There is no magical search for
INSTANCE_HOME/Products; it is included as part of the instance skeleton,
but can be controlled simply changing the configuration.

lib/python/Zope/Startup/handlers.py

@@ -101,6 +101,16 @@ def root_handler(config):
     fixups of values that require knowledge about configuration
     values outside of their context. """
 
+    # Add any product directories not already in Products.__path__.
+    # Directories are added in the order
+    if config.products:
+        import Products
+        L = []
+        for d in config.products + Products.__path__:
+            if d not in L:
+                L.append(d)
+        Products.__path__[:] = L
+
     # if no servers are defined, create default http server and ftp server
     if not config.servers:
         import ZServer.datatypes

lib/python/Zope/Startup/zopeschema.xml

@@ -179,6 +179,14 @@
     </description>
   </key>
 
+  <multikey name="products" datatype="existing-directory">
+    <description>
+      This specifies additional product directories which are added to
+      Products.__path__.  Directories are added in the order in which
+      they are specified.
+    </description>
+  </multikey>
+
   <key name="structured-text-header-level" datatype="integer" default="3"
        handler="structured_text_header_level"/>
 

skel/etc/zope.conf.in

@@ -43,6 +43,23 @@ instancehome $INSTANCE
 #    clienthome /home/chrism/projects/sessions/var
 
 
+# Directive: products
+#
+# Description:
+#     Name of a directory that contains product packages.  This
+#     directive may be used as many times as needed to add additional
+#     collections of products.  Each directory identified will be
+#     added to the __path__ of the Products package.
+#
+# Default: (none)
+#
+# Example:
+#
+#    products /home/chrism/projects/myproducts
+
+products $INSTANCE/Products
+
+
 # Directive: debug-mode
 #
 # Description: