MacOS.Error for platform.mac_ver under OS X

[brettcannon]

BPO	780461
Nosy	@malemburg, @brettcannon, @jackjansen

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/malemburg'
closed_at = <Date 2003-10-14.22:30:18.000>
created_at = <Date 2003-07-30.20:20:50.000>
labels = ['library']
title = 'MacOS.Error for platform.mac_ver under OS X'
updated_at = <Date 2003-10-14.22:30:18.000>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2003-10-14.22:30:18.000>
actor = 'brett.cannon'
assignee = 'lemburg'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2003-07-30.20:20:50.000>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 780461
keywords = []
message_count = 5.0
messages = ['17483', '17484', '17485', '17486', '17487']
nosy_count = 3.0
nosy_names = ['lemburg', 'brett.cannon', 'jackjansen']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue780461'
versions = ['Python 2.3']

[brettcannon]

>>> platform.mac_ver()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/Users/drifty/cvs_code/lib/python2.3/platform.py", 
line 563, in mac_ver
    sysv,sysu,sysa = _mac_ver_lookup(('sysv','sysu','sysa'))
  File "/Users/drifty/cvs_code/lib/python2.3/platform.py", 
line 532, in _mac_ver_lookup
    append(gestalt(selector))
MacOS.Error: (-5551, 'undefined selector was passed to 
Gestalt')

This is on an OS X 10.2.6 system.

Any chance this is because I compiled with --enable-
unicode=ucs4 ?

[jackjansen]

Logged In: YES
user_id=45365

The problem is not with your ucs4 build, this call always fails
under MacOSX. The problem is that the 'sysu' gestalt selector isn't
available under OSX.

The code in _mac_ver_lookup does a try/except on RuntimeError
around the call to gestalt, but I don't remember MacOS.Error ever
being a subclass of RuntimeError. Currently MacOS.Error is in a
class by itself, it should probably be an OSError subclass, but that
still won't fix this.

I suggest doing the try/except on MacOS.Error.

[malemburg]

Logged In: YES
user_id=38388

Catching MacOS.Error doesn't help much: if 'sysu' is not
available on MacOSX, then I need the system information
from somewhere else. Any hints ? (don't have a MacOSX
to test on, so it's up to you to provide the necessary
information or patch :-)

Thanks.

[brettcannon]

Logged In: YES
user_id=357491

I have no clue how to get the info but I can help test anything. I
think Jack is going to have to be the big helper in terms of how to
patch this one.

[brettcannon]

Logged In: YES
user_id=357491

Well, this is working for me under 2.4 (still busted under 2.3,
though). But a quick check of the cvs logs and it turns out Jack
wanted this backported but just didn't get to it.

So I will go ahead and backport the changes from 1.6 and 1.7 to
release23-maint.