[issue3387] OS X Lion, fresh Python 2.7.3 and hg 2.1.2 == CRASH

[Christian Tismer]

New submission from Christian Tismer <tismer at stackless.com>:

This bug was tested on two OS X Lion machines.

After installing genuine Mac Python 2.7.3 from python.org,
using python-2.7.3-macosx10.6.dmg  (official for 10.6 and 10.7)

Installed mercurial-2.1.2+20120401-py2.7-macosx10.7.mpkg

Symptom:


$ hg
Traceback (most recent call last):
  File "/usr/local/bin/hg", line 36, in <module>
    mercurial.util.setbinary(fp)
  File "/Library/Python/2.6/site-packages/mercurial/demandimport.py", line 
76, in __getattribute__
    return getattr(self._module, attr)
AttributeError: 'module' object has no attribute 'setbinary'

Reason:
The python 2.7.3 installer puts python into /usr/local/bin .
The mercurial installer installs in the correct site-packages.

But the shebang in /usr/local/bin/hg has a hardcoded "#!/usr/bin/python"
which causes the hg command to start the wrong python, which is lacking
a 2.7 feature and crashes.

In my case there happens to be an older hg version installed.
But this should not matter at all.

Resolution (my hack):
- the shebang line of the hg command should contain the right python path.

Resolution (clean):
- I propose to check the python version that is claimed in the name of the
mpkg if it really is installed, and then either
  - insert the correct path into the hg script
  - reject installation if the correct version is not installed

I marked this as critical because it puts hg and its testing quality
before publishing a release into a bad light that hg does not deserve.

Kind regards - Chris

p.s.: I'm the one who wrote stackless python.
Hey to mercurial, really great!

----------
messages: 19688
nosy: ctismer
priority: critical
status: chatting
title: OS X Lion, fresh Python 2.7.3 and hg 2.1.2 == CRASH

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Mercurial issue tracker <bugs at mercurial.selenic.com>
<http://mercurial.selenic.com/bts/issue3387>
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