Re: [Distutils] Releasing zc.buildout

14 Mar 2009

      On Thu, Mar 12, 2009 at 02:44:07PM -0400, Tres Seaver wrote:
...
I spoke too soon:  the 'boostrap' failure looks like what I described,
but another failfure is a doctest which barfs due to a major change in
exception formatting in Python 2.6.  I tried to get ELLIPSIS to hide the
differences, but my doctest-fu is to weak:
Doctests have some caveats.
...
------------------------------- 8< ---------------------------
File
"/home/tseaver/projects/Zope-CVS/zc.buildout-trunk/src/zc/buildout/tests.py",
line 1725, in zc.buildout.tests.install_source_dist_with_bad_py
Failed example:
    print system(buildout), # doctest: +NORMALIZE_WHITESPACE +ELLIPSIS
Expected:
    Installing eggs.
    Getting distribution for 'badegg'.
    Got badegg 1.
    Installing bo.
    Generated script '/sample-buildout/bin/bo'.
    ...
    SyntaxError:...'return' outside function...
    ...
    SyntaxError:...'return' outside function...
Got:
    Installing eggs.
    Getting distribution for 'badegg'.
    Got badegg 1.
    Installing bo.
    Generated script '/sample-buildout/bin/bo'.
    SyntaxError: ("'return' outside function",
('build/bdist.linux-i686/egg/badegg/scripts/one.py', 2, None, 'return 1/n'))
    <BLANKLINE>
    SyntaxError: ("'return' outside function",
('/sample-buildout/eggs/tmpSUUYdy/badegg-1-pyN.N.egg/badegg/scripts/one.py',
2, None, 'return 1/n'))
    <BLANKLINE>
------------------------------- 8< ---------------------------
Let's look at this again:
...
Generated script '/sample-buildout/bin/bo'.
    ...
    SyntaxError:...'return' outside function...
does not match
...
Generated script '/sample-buildout/bin/bo'.
    SyntaxError: ("'return' outside function",
because of an unfortunate interaction between ELLIPSIS and
NORMALIZE_WHITESPACE.

NORMALIZE_WHITESPACE converts your pattern into

  Generated script '/sample-buildout/bin/bo'. ... SyntaxError:...

and the matched text to

  Generated script '/sample-buildout/bin/bo'. SyntaxError:...

Then ELLIPSIS has a mismatch because even if you substitute the '...'
with an empty string, the pattern wants two spaces where the text has
one.

I tried to report this as
https://bugs.launchpad.net/zope.testing/+bug/126169
once, but was unable to convince Jim that this behaviour trips people
up.  (Also, I did not try to provide a patch to fix the issue.)

HTH,
Marius Gedminas
-- 
This sentence contradicts itself -- no actually it doesn't.
                -- Douglas Hofstadter