[Distutils] Proposal for incorporating buildout-versions on buildout (Re: Better version pinning in buildout (buildout-versions))

[Chris Withers]

On 13/01/2013 03:43, Marius Gedminas wrote:
>>> 4. Change: develop eggs found in the buildout's develop-eggs directory
>>>    will be used even if their version conflicts with a pinned version.
>>
>> Did somebody ask for this?
>
> I believe I mentioned this.
>
> I used to trip on this gotcha practically every time:
>
>    - work on package foo that depends on bar
>    - discover a bug in bar that manifests when I use it from foo
>    - check out bar from svn trunk
>    - add a 'mg.cfg' in foo's source tree with
>        [buildout]
>        extends = buildout.cfg
>        develop = ../bar
>    - bin/buildout -c mg.cfg
>    - try some import pdb; pdb.set_trace() or debug prints in
>      ../bar/src/..., run a project in foo, wonder why the
>      breakpoints/debug prints won't work, check bin/runfoo, see
>      ~/.buildout/eggs/bar-1.2.3.egg in there, realize what's the matter
>    - edit mg.cfg again, add
>        [versions]
>        bar =
>    - run bin/buildout -c mg.cfg again, continue debugging.
>
> It's an unnecessary speedbump.

Yeah, I thought it might be this ;-)
I don't know how hard it'd be top implement but in an ideal world I'd 
prefer to see develop eggs trump any other sources but still have 
version requirements checked.

An example of why would be as above, except that I check out the wrong 
branch (trunk versus the major version the project should be using), fix 
the bug, check in, release, remove develop line and get annoyed that I 
still have the problem.

Chris

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