Proposal: default to concurrent

[Roland Smith]

On Sun, Jan 29, 2017 at 08:26:27PM -0500, John W. O'Brien wrote:
> Thank you for your input.
> 
> On 1/29/17 19:50, Roland Smith wrote:
> [...]
> > There also seems to be a trend of separate py3-* ports. This is sometimes a
> > much better solution than trying to make a single port support python 2 and 3.
> 
> If I am not mistaken, the purpose of the py3-* ports is mainly to
> deliver some python3 support via the default build and thence the
> official pkg repository. As a convenience for those of who build our own
> ports, it also enables 2+3 support within a single build instead of
> having to coordinate multiple builds and maintain multiple repositories.

There are more issues with building the same port for two different python
versions. The #!-line will be different which leads to daily warnings about
mismatching checksums.

> Sadly, I don't see how it would address this pain point. Even with

I didn't mean to imply it was. I just thought them very useful.

> py-SPAM and py3-SPAM, or py2-SPAM and py-SPAM, concurrent *installation*
> still requires that the intersection of plists is the empty set.

To achieve this, any scripts/binaries installed by a Python package would
*always* have to be suffixed. Personally, I don't mind since basically every
shell has tab-completion.

Maybe we should just suffix *all* python-based scripts, and *don't* install a
suffix-less one? That would certainly make things clear (explicit even ;-).
But as others have mentioned, it might not be what some people expect.

Could we add an automatic extra to the pkg-message, like:

    To enable the installation of package FOO for multiple Python versions,
    the script BAR has been installed for Python-X.Y as BAR-X.Y.

> Furthermore, concurrent installation is useful for multiple minor
> versions of python3, not just python2.7 plus python3.x.

So suffixes it is, then?


Roland
-- 
R.F.Smith                                   http://rsmith.home.xs4all.nl/
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