I think I've found a bug in the way that setuptools selects whether an egg specified by file:// url should be installed over an existing (identical) egg: To re-create the fault: * Install the egg of your choice. * make two local "egg repositories", one with a very long path (e.g. c:/a/) and one with a very long path * In each of the egg repositories place a copy of the egg you just installed, along with an HTML file containing a link to that egg... just it's filename. * Try to easy_install the egg with the options "-mv" and set "-f" to either one of the repositories When you select a short path for the repository you will notice that the egg in your site_packages folder is always replaced, you see something like this: "Removing d:\devtools\python24\lib\site-packages\calyon-1.0_r2009_03_12-py2.4-win3 2.egg" When you select a very long path for the repository you will not see this message, this is because easy_install leaves the egg unmodified. I've found out why this happens: The pkg_resources.Environment uses a hash-tuple to work out the order in which to consider packages to install. If you are trying to install two identical eggs, the 4th element of the tuple -len(self.location or '') becomes significant... longer URLs get preference to shorter URLs. That on it's own might not seem too bad, but consider the the 2nd value of the hash-tuple (precedence) is given an identical value of 3 both for a package which is already installed in pkg_resources and a package which can already be downloaded from a file:// link. I think a better default behaviour would be for it to give stuff that is already installed a higher precedence than stuff which could potentially be installed. Hope all of this makes sense! Sal
This email does not create a legal relationship between any member of the Cr=E9dit Agricole group and the recipient or constitute investment advice. The content of this email should not be copied or disclosed (in whole or part) to any other person. It may contain information which is confidential, privileged or otherwise protected from disclosure. If you are not the intended recipient, you should notify us and delete it from your system. Emails may be monitored, are not secure and may be amended, destroyed or contain viruses and in communicating with us such conditions are accepted. Any content which does not relate to business matters is not endorsed by us.
Calyon is authorised by the Comit=e9 des Etablissements de Cr=e9dit et des Entreprises d'Investissement (CECEI) and supervised by the Commission Bancaire in France and subject to limited regulation by the Financial Services Authority. Details about the extent of our regulation by the Financial Services Authority are available from us on request. Calyon is incorporated in France with limited liability and registered in England & Wales. Registration number: FC008194. Registered office: Broadwalk House, 5 Appold Street, London, EC2A 2DA. This message and/or any attachments is intended for the sole use of its addressee. If you are not the addressee, please immediately notify the sender and then destroy the message. As this message and/or any attachments may have been altered without our knowledge, its content is not legally binding on CALYON Crédit Agricole CIB. All rights reserved. Ce message et ses pièces jointes est destiné à l'usage exclusif de son destinataire. Si vous recevez ce message par erreur, merci d'en aviser immédiatement l'expéditeur et de le détruire ensuite. Le présent message pouvant être altéré à notre insu, CALYON Crédit Agricole CIB ne peut pas être engagé par son contenu. Tous droits réservés.
_______________________________________________ Distutils-SIG maillist - Distutils-SIG@python.org http://mail.python.org/mailman/listinfo/distutils-sig
