generates wrong output with version_only option

Bug #92287 reported by Pascal R.
Affects Status Importance Assigned to Milestone
python-central (Ubuntu)
Fix Released

Bug Description

Binary package hint: python-central

On Ubuntu 6.10 running pyversions -vd should return '2.4' but it returns 'in/python2.4'
this also affects post-install configurations with pycentral.

the script is installed in two locations and two versions (!?):

Both can be fixed this way:
* search location of this text:

def default_version(version_only=False):
    global _default_version
    if not _default_version:
        _default_version = link = os.readlink('/usr/bin/python')
    if version_only:
        return _default_version[6:]
        return _default_version

* replace the line:

        return _default_version[6:]

* with this line:

        return _default_version.split('python')[-1]

Is this the right place to post this bugreport/fix? This was my first one.

Revision history for this message
Filip Salomonsson (filip-salomonsson) wrote :

This occurs if /usr/bin/python is a symbolic link whose target is an absolute path, not just "python2.x". It's not on my system, but apparently it can be.

Another, related, issue is that update-alternatives may make /usr/bin/python a link to /etc/alternatives/python, which, in turn, is a link to /usr/bin/python2.x. The original function does not cater for such circumstances.

I believe the attached patch fixes both issues, but I haven't tested it (beyond verifying that the results are as correct as before on my own box).

Revision history for this message
Pascal R. (niun) wrote :

this patch works on my system (Ubuntu 6.10) and it is better than my prior posted patch, because it sets the global variable _default_version to the correct value.

Changed in python-central:
status: New → Fix Committed
Revision history for this message
Matthias Klose (doko) wrote :

You never should modify files by yourself in /usr (except /usr/local); doing so will make your system unreliable (and as seen here break it in some cases). Using alternatives is not possible: you'll break all those modules and extensions that are available for one python version only.

If you do want to set another default for your own use, use /usr/local/bin, or ~/bin.

closing the report.

Changed in python-central:
status: Fix Committed → Fix Released
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