[Distutils] Better version pinning in buildout (buildout-versions)
jim at zope.com
Mon Jan 7 23:51:56 CET 2013
On Mon, Jan 7, 2013 at 9:57 AM, Marius Gedminas <marius at pov.lt> wrote:
> On Mon, Jan 07, 2013 at 09:45:58AM -0500, Jim Fulton wrote:
>> No. The versions-file can be used with the existing mechanism.
>> I tried, but apparently failed, to make this clear in the proposal.
>> If both a versions file and a versions section is used, the versions
>> section behaves as it does now and versions in the versions file
>> override versions specified in the versions section.
> This seems backwards to me.
> Consider this example
> $ cat buildout.cfg
> I-forgot-the-suggested-new-spelling-for-a-versions-file = versions.txt
> parts = ...
> $ cat mg.cfg
> extends = buildout.cfg
> versions = versions
> SomePackage = overridden_version
> I would expect bin/buildout -c mg.cfg to use my overridden version from
> mg.cfg, not the one from versions-file.txt.
So would you be happy if the version from mg.cfg overrode the
version from the versions file?
> Also, having two similar but slightly distinct mechanisms for version
> pinning? I'm -1 on that.
In an earlier message, you wrote
> If you also add
> buildout_versions_file = versions.cfg
> it'll append new version pins to versions.cfg with the versions that
> are picked while you run bin/buildout. It's not smart -- you have to
> ensure the file you're writing to ends with a [versions] section, and
> that your mail buildout.cfg specifies `extends = versions.cfg` and that
> you have `[buildout] versions = versions` in either of the config files.
This sounded like a complaint to me. It seemed like a lot of things
you had to know and get right to use the mechanism.
Maybe I read too much into what you wrote.
The version-file option tries to simplify the process. For the
large percentage of cases where you don't care about known-good sets
or layered configurations, it's the only mechanism you need.
If we had version-file, then the version option would become the
advanced option used when you do need to layer configurations.
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