[Pulp-dev] pin pulpcore?

[Tatiana Tereshchenko]

With more plugins going Beta and with frequent releases of pulpcore and
pulpcore-plugin an issue with dependencies version showed up:
 - plugin requires pulpcore-plugin == 0.1.0bX
 - pulpcore-plugin 0.1.0bX requires pulpcore >= 3.0.0bY
 - at some point pulpcore introduces backward incompatible changes and the
newest pulpcore is incompatible with the old pulpcore-plugin. E.g.
https://pulp.plan.io/issues/4317

It would be less of a problem when pulpcore goes GA but till then it is not
nice user experience.

Options to solve the issue:
 1. Pin pulpcore with every pulpcore-plugin release
 2. Pin pulpcore directly in a plugin
 3. Don't do anything, we are in Beta, it will be fine when pulpcore is GA,
semver will keep us from introducing backward incompatible changes in the Y
or Z releases.
 4. anything else?

As a side note, we already have an issue with having multiple plugins
installed if they require different pulpcore-plugin versions, so pinning
pulpcore wouldn't introduce a new problem.  Again this should be solved
when we go GA, in my opinion.

Any thoughts or concerns are welcome.

Thank you,
Tanya
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