Use non-destructive subconfigs instead of in-place per-root patching of config object

lib/config.py

@@ -23,6 +23,7 @@ import vclib.ccvs
 import vclib.svn
 import cvsdb
 import viewvc
+import copy
 from viewvcmagic import ContentMagic
 
 #########################################################################
@@ -143,6 +144,8 @@ class Config:
 
   def __init__(self):
     self.__guesser = None
+    self.__root_configs = {}
+    self.__parent = None
     self.root_options_overlayed = 0
     for section in self._base_sections:
       if section[-1] == '*':
@@ -283,6 +286,34 @@ class Config:
 
     return None
 
+  def get_root_config(self, rootname):
+    """Get configuration object with per-root overrides for 'rootname'"""
+    if self.__parent:
+      return self.__parent.get_root_config(rootname)
+    elif rootname in self.__root_configs:
+      return self.__root_configs[rootname]
+    __guesser = self.__guesser
+    __root_configs = self.__root_configs
+    parser = self.parser
+    self.parser = None
+    self.__guesser = None
+    self.__root_configs = None
+    sub = copy.deepcopy(self)
+    sub.parser = parser
+    self.parser = parser
+    self.__guesser = __guesser
+    self.__root_configs = __root_configs
+    self.__root_configs[rootname] = sub
+    sub.__parent = self
+    sub.overlay_root_options(rootname)
+    return sub
+
+  def get_parent_config(self):
+    """Get the parent non-overridden config."""
+    if self.__parent:
+      return self.__parent
+    return self
+
   def overlay_root_options(self, rootname):
     """Overlay per-root options for ROOTNAME atop the existing option
     set.  This is a destructive change to the configuration."""
@@ -317,55 +348,6 @@ class Config:
         d[option] = parser.get(section, option)
       return d.items()
 
-  def get_authorizer_and_params_hack(self, rootname):
-    """Return a 2-tuple containing the name and parameters of the
-    authorizer configured for use with ROOTNAME.
-
-    ### FIXME: This whole thing is a hack caused by our not being able
-    ### to non-destructively overlay root options when trying to do
-    ### something like a root listing (which might need to get
-    ### different authorizer bits for each and every root in the list).
-    ### Until we have a good way to do that, we expose this function,
-    ### which assumes that base and per-vhost configuration has been
-    ### absorbed into this object and that per-root options have *not*
-    ### been overlayed.  See issue #371."""
-
-    # We assume that per-root options have *not* been overlayed.
-    assert(self.root_options_overlayed == 0)
-
-    if not self.conf_path:
-      return None, {}
-
-    # Figure out the authorizer by searching first for a per-root
-    # override, then falling back to the base/vhost configuration.
-    authorizer = None
-    root_options_section = 'root-%s/options' % (rootname)
-    if self.parser.has_section(root_options_section) \
-       and self.parser.has_option(root_options_section, 'authorizer'):
-      authorizer = self.parser.get(root_options_section, 'authorizer')
-    if not authorizer:
-      authorizer = self.options.authorizer
-
-    # No authorizer?  Get outta here.
-    if not authorizer:
-      return None, {}
-
-    # Dig up the parameters for the authorizer, starting with the
-    # base/vhost items, then overlaying any root-specific ones we find.
-    params = {}
-    authz_section = 'authz-%s' % (authorizer)
-    if hasattr(self, authz_section):
-      sub_config = getattr(self, authz_section)
-      for attr in dir(sub_config):
-        params[attr] = getattr(sub_config, attr)
-    root_authz_section = 'root-%s/authz-%s' % (rootname, authorizer)
-    for section in self.parser.sections():
-      if section == root_authz_section:
-        for key, value in self._get_parser_items(self.parser, section):
-          params[key] = value
-    params['__config'] = self
-    return authorizer, params
-
   def get_authorizer_params(self, authorizer=None):
     """Return a dictionary of parameter names and values which belong
     to the configured authorizer (or AUTHORIZER, if provided)."""

lib/query.py

@@ -300,11 +300,10 @@ def is_forbidden(cfg, cvsroot_name, module):
     # the base and per-vhost configuration for authorizer and
     # authorizer parameters.
     if cvsroot_name:
-        authorizer, params = cfg.get_authorizer_and_params_hack(cvsroot_name)
-    else:
-        authorizer = cfg.options.authorizer
-        params = cfg.get_authorizer_params()
-        
+        cfg = cfg.get_root_config(cvsroot_name)
+    authorizer = cfg.options.authorizer
+    params = cfg.get_authorizer_params()
+
     # If CVSROOT_NAME isn't configured to use an authorizer, nothing
     # is forbidden.  If it's configured to use something other than
     # the 'forbidden' authorizer, complain.  Otherwise, check for

lib/viewvc.py

@@ -296,9 +296,11 @@ class Request:
         self.repos = rcr.repos
         self.rootpath = rcr.rootpath
         self.auth = rcr.auth
+
         # Overlay root-specific options.
-        cfg.overlay_root_options(self.rootname)
-        
+        cfg = cfg.get_root_config(self)
+        self.cfg = cfg
+
         # Setup an Authorizer for this rootname and username
         debug.t_start('setup-authorizer')
         self.auth = setup_authorizer(cfg, self.username)
@@ -896,12 +898,12 @@ def setup_authorizer(cfg, username, rootname=None):
   """Setup the authorizer.  If ROOTNAME is provided, assume that
   per-root options have not been overlayed.  Otherwise, assume they
   have (and fetch the authorizer for the configured root)."""
-  
-  if rootname is None:
-    authorizer = cfg.options.authorizer
-    params = cfg.get_authorizer_params()
-  else:
-    authorizer, params = cfg.get_authorizer_and_params_hack(rootname)
+
+  if rootname is not None:
+    cfg = cfg.get_root_config(rootname)
+
+  authorizer = cfg.options.authorizer
+  params = cfg.get_authorizer_params()
 
   # No configured authorizer?  No problem.
   if not authorizer: