Added a warning if a namespace package is declared, but its parent

package is not also declared as a namespace.  (backport from trunk)

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4060817

setuptools.txt

@@ -2628,6 +2628,9 @@ Release Notes/Change History
  * Allow ``ez_setup.use_setuptools()`` to upgrade existing setuptools
    installations when called from a standalone ``setup.py``.
 
+ * Added a warning if a namespace package is declared, but its parent package
+   is not also declared as a namespace.
+
 0.6c7
  * Fixed ``distutils.filelist.findall()`` crashing on broken symlinks, and 
    ``egg_info`` command failing on new, uncommitted SVN directories.

setuptools/dist.py

@@ -8,7 +8,7 @@ from setuptools.command.install_lib import install_lib
 from distutils.errors import DistutilsOptionError, DistutilsPlatformError
 from distutils.errors import DistutilsSetupError
 import setuptools, pkg_resources, distutils.core, distutils.dist, distutils.cmd
-import os
+import os, distutils.log
 
 def _get_unpatched(cls):
     """Protect against re-patching the distutils if reloaded
@@ -51,13 +51,19 @@ def assert_string_list(dist, attr, value):
 def check_nsp(dist, attr, value):
     """Verify that namespace packages are valid"""
     assert_string_list(dist,attr,value)
-
     for nsp in value:
         if not dist.has_contents_for(nsp):
             raise DistutilsSetupError(
                 "Distribution contains no modules or packages for " +
                 "namespace package %r" % nsp
             )
+        if '.' in nsp:
+            parent = '.'.join(nsp.split('.')[:-1])
+            if parent not in value:
+                distutils.log.warn(
+                    "%r is declared as a package namespace, but %r is not:"
+                    " please correct this in setup.py", nsp, parent
+                )
 
 def check_extras(dist, attr, value):
     """Verify that extras_require mapping is valid"""
@@ -71,15 +77,15 @@ def check_extras(dist, attr, value):
             "requirement specifiers."
         )
 
+
+
+
 def assert_bool(dist, attr, value):
     """Verify that value is True, False, 0, or 1"""
     if bool(value) != value:
         raise DistutilsSetupError(
             "%r must be a boolean value (got %r)" % (attr,value)
         )
-
-
-
 def check_requirements(dist, attr, value):
     """Verify that install_requires is a valid requirements list"""
     try:
@@ -89,7 +95,6 @@ def check_requirements(dist, attr, value):
             "%r must be a string or list of strings "
             "containing valid project/version requirement specifiers" % (attr,)
         )
-
 def check_entry_points(dist, attr, value):
     """Verify that entry_points map is parseable"""
     try:
@@ -97,12 +102,10 @@ def check_entry_points(dist, attr, value):
     except ValueError, e:
         raise DistutilsSetupError(e)
 
-
 def check_test_suite(dist, attr, value):
     if not isinstance(value,basestring):
         raise DistutilsSetupError("test_suite must be a string")
 
-
 def check_package_data(dist, attr, value):
     """Verify that value is a dictionary of package names to glob lists"""
     if isinstance(value,dict):
@@ -118,9 +121,6 @@ def check_package_data(dist, attr, value):
         "wildcard patterns"
     )
 
-
-
-
 class Distribution(_Distribution):
     """Distribution with support for features, tests, and package data