The python that's inside stage 1 or 2 is built with a minimal

configuration which does not include the /usr/lib/pythonX.Y/encodings
directory. This results in error like the following:

  LookupError: no codec search functions registered: can't find encoding

In order to solve this problem, detect it early and manually register
a search function for the ascii codec. Starting with python-3.0 this
problem is more noticeable because of stricter handling of encoding
and decoding between strings of characters and bytes.

svn path=/main/trunk/; revision=12684

diff --git a/pym/portage/__init__.py b/pym/portage/__init__.py
index 56a8c4f21e38db60c2fbbe08c15f5834cd549eb7..c5d4342c204c57d8fc2c2484d4a361f5c557b8cb 100644 (file)
--- a/pym/portage/__init__.py
+++ b/pym/portage/__init__.py
@@ -7464,6 +7464,62 @@ def portageexit():
 
 atexit_register(portageexit)
 
+def _ensure_default_encoding():
+       """
+       The python that's inside stage 1 or 2 is built with a minimal
+       configuration which does not include the /usr/lib/pythonX.Y/encodings
+       directory. This results in error like the following:
+
+         LookupError: no codec search functions registered: can't find encoding
+
+       In order to solve this problem, detect it early and manually register
+       a search function for the ascii codec. Starting with python-3.0 this
+       problem is more noticeable because of stricter handling of encoding
+       and decoding between strings of characters and bytes.
+       """
+
+       import codecs
+       try:
+               codecs.lookup(sys.getdefaultencoding())
+       except LookupError:
+               pass
+       else:
+               return
+
+       class IncrementalEncoder(codecs.IncrementalEncoder):
+               def encode(self, input, final=False):
+                       return codecs.ascii_encode(input, self.errors)[0]
+
+       class IncrementalDecoder(codecs.IncrementalDecoder):
+               def decode(self, input, final=False):
+                       return codecs.ascii_decode(input, self.errors)[0]
+
+       class StreamWriter(codecs.StreamWriter):
+               encode = codecs.ascii_encode
+
+       class StreamReader(codecs.StreamReader):
+               decode = codecs.ascii_decode
+
+       # The sys.setdefaultencoding() function doesn't necessarily exist,
+       # so just setup the ascii codec to correspond to whatever name
+       # happens to be returned by sys.getdefaultencoding().
+       encoding = sys.getdefaultencoding()
+
+       def search_function(name):
+               if name != encoding:
+                       return None
+               return codecs.CodecInfo(
+                       name=encoding,
+                       encode=codecs.ascii_encode,
+                       decode=codecs.ascii_decode,
+                       incrementalencoder=IncrementalEncoder,
+                       incrementaldecoder=IncrementalDecoder,
+                       streamwriter=StreamWriter,
+                       streamreader=StreamReader,
+               )
+
+       codecs.register(search_function)
+
 def _global_updates(trees, prev_mtimes):
        """
        Perform new global updates if they exist in $PORTDIR/profiles/updates/.
@@ -7854,6 +7910,8 @@ if True:
                "flushmtimedb"):
                globals()[k] = _LegacyGlobalProxy(k)
 
+       _ensure_default_encoding()
+
 # Clear the cache
 dircache={}