[Bug 1325025] Re: juju-core does not depend on distro-info

[Robie Basak]

** Description changed:

+ [Impact]
+ 
+ Juju in a particular release is expected to deploy future releases
+ unless something fundamental has changed about them. Without having
+ distro-info installed, a user would need to wait for an SRU to juju-
+ core's hardcoded defaults, which we don't want to have to do.
+ 
+ [Development Fix]
+ 
+ Depend on distro-info. Juju automatically sees this and uses its
+ information over its hardcoded defaults (which are necessary on other
+ platforms that do not have distro-info available).
+ 
+ [Stable Fix]
+ 
+ Same as development fix.
+ 
+ [Test Case]
+ 
+ There isn't really one currently that can effectively be executed
+ manually, since it involve waiting for a new release. However, there are
+ now dep8 tests which pretend that a future release exists and that Juju
+ works on them. These should be verified to pass. The catch is that for a
+ Trusty SRU, Utopic exists, of course, and Juju 1.18.4 already knows
+ about it. On balance, I think that if the dep8 "future" tests succeed,
+ then this is sufficient to have confidence that Utopic+1 will also work.
+ 
+ [Regression Potential]
+ 
+ A Juju user who previously did not have distro-info installed will
+ switch Juju's source of knowledge of distribution releases. This could
+ cause a change in behavior.
+ 
+ [Original Description]
+ 
  juju uses distro-info-data to understand what Ubuntu releases exist,
  falling back to its own knowledge if it is not available. When we open a
  new development release, the version of juju-core that is copied forward
  does not know about the release, causing juju-core such as in bug
  1314686.
  
  As we work to eliminate these bugs, so that juju-core does not have
  release names hardcoded, we should also make sure that distro-info-data
  is always available to juju, so that as we open new releases, juju-core
  will automatically learn about and be able to use them without having to
  change juju-core itself.
  
  So we should add a dependency of distro-info (or -data) to juju-core.

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https://bugs.launchpad.net/bugs/1325025

Title:
  juju-core does not depend on distro-info

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