[Bug 1693226] Re: Break the conflicts with click the optparser

[Leo Arias]

We tested this in xenial, yakkety and zesty proposed, together with snapcraft for bug #1692102.
No issues found with the rename of the package, and now snapcraft can be updated without problems.

I've just marked this as verified.

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https://bugs.launchpad.net/bugs/1693226

Title:
  Break the conflicts with click the optparser

Status in click package in Ubuntu:
  Fix Released
Status in click source package in Xenial:
  Fix Committed
Status in click source package in Yakkety:
  Fix Committed
Status in click source package in Zesty:
  Fix Committed
Status in click source package in Artful:
  Fix Released

Bug description:
  [Impact]

   * python-click and python-click-package conflict as they use the same
     python package for its implementation.

   * Since python-click-package is an implementation detail for the click 
     package and python3-click is a package meant to be used in other
     implementations it makes sense to break the conflict by moving the
     package name for python-click-package to a different name

   * snapcraft has moved from docopt to python3-click, users that have click
     installed don't have an upgrade path.his bug.

  [Test Case]

   * Where snapcraft 2.30 is present:
     
     - apt install click
     - Install snapcraft << 2.30
     - update to snapcraft >= 2.30
     - the upgrade should not be held on any package.
     - click and snapcraft commands should work.

  * Install python3-click and click should be possible. The click command
    should keep working and python3 -c 'from click import group' shall work.

  
  [Regression Potential] 

   * Users depending on click from python-click-package will be importing an
     unexpected click in any scripts they may have.

  [Other Info]
   
   * While unfortunate, click as a technology is deprecated and not used
     anymore. This resolution path was discussed with slangasek and apw prior
     to any work.

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