Fix a problem installing eggs with a system packaging tool if the project

contained an implicit namespace package; for example if the ``setup()``
listed a namespace package ``foo.bar`` without explicitly listing
``foo`` as a namespace package. (backport from trunk)

--HG--
branch : setuptools-0.6
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/branches/setuptools-0.6%4053271

2 files changed, 51 insertions, 5 deletions

diff --git a/setuptools.txt b/setuptools.txt
index 0997122a..9f6fed9e 100755
--- a/setuptools.txt
+++ b/setuptools.txt
@@ -2623,6 +2623,11 @@ Release Notes/Change History
    ``develop`` and the source directory is a subdirectory of the installation
    target directory.
 
+ * Fix a problem installing eggs with a system packaging tool if the project
+   contained an implicit namespace package; for example if the ``setup()``
+   listed a namespace package ``foo.bar`` without explicitly listing ``foo``
+   as a namespace package.
+
 0.6c3
  * Fixed breakages caused by Subversion 1.4's new "working copy" format
 
diff --git a/setuptools/command/install_egg_info.py b/setuptools/command/install_egg_info.py
index 4c79f41b..8f972638 100755
--- a/setuptools/command/install_egg_info.py
+++ b/setuptools/command/install_egg_info.py
@@ -22,7 +22,7 @@ class install_egg_info(Command):
             None, None, ei_cmd.egg_name, ei_cmd.egg_version
         ).egg_name()+'.egg-info'
         self.source = ei_cmd.egg_info
-        self.target = os.path.join(self.install_dir, basename) 
+        self.target = os.path.join(self.install_dir, basename)
         self.outputs = [self.target]
 
     def run(self):
@@ -43,7 +43,7 @@ class install_egg_info(Command):
         return self.outputs
 
     def copytree(self):
-        # Copy the .egg-info tree to site-packages       
+        # Copy the .egg-info tree to site-packages
         def skimmer(src,dst):
             # filter out source-control directories; note that 'src' is always
             # a '/'-separated path, regardless of platform.  'dst' is a
@@ -57,9 +57,8 @@ class install_egg_info(Command):
         unpack_archive(self.source, self.target, skimmer)
 
     def install_namespaces(self):
-        nsp = (self.distribution.namespace_packages or [])[:]
+        nsp = self._get_all_ns_packages()
         if not nsp: return
-        nsp.sort()  # set up shorter names first
         filename,ext = os.path.splitext(self.target)
         filename += '-nspkg.pth'; self.outputs.append(filename)
         log.info("Installing %s",filename)
@@ -78,5 +77,47 @@ class install_egg_info(Command):
                     "(p not in mp) and mp.append(p)\n"
                     % locals()
                 )
-            f.close()            
+            f.close()
+
+
+    def _get_all_ns_packages(self):
+        nsp = {}
+        for pkg in self.distribution.namespace_packages or []:
+            pkg = pkg.split('.')
+            while pkg:
+                nsp['.'.join(pkg)] = 1
+                pkg.pop()
+        nsp=list(nsp)
+        nsp.sort()  # set up shorter names first
+        return nsp
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