Support for assessment format version: stage 2 (p-a)

[AloisMahdal]

This is part of a greater change that needs to be done in all three codebases in 3 stages:

• 1. preupgrade-assistant-modules (#31),
• 2. preupgrade-assistant (this ticket),
• 3. redhat-upgrade-tool (#31).

Below is the complete description:

---

Assessment, as a data object does not currently have any concept of versioning. Any tools that further work with it (redhat-upgrade-tool, preupg-kickstart-creator, preupg UI...) simply have to assume that they "understand" the data.

The solution is to introduce assessment format version. The flow is:

• Module set declares its abability to produce assessment in version $V. This can be done
  by means of key/value pair in properties.ini

  assessment_format_version = 0.1
  

• Assisstant launches modules and passes this information as part of assessment
  somewhere under (/root/preupgrade as well as in tarball).

• redhat-upgrade-tool hardcodes range of versions (actually just one particular version)
  it's able to "understand" and compares this against assessment version. If the versions
  match, it can continue. If the versions don't match or assessment version cannot be
  determined, it advises user to install respective module set and re-run assessment.

[bocekm]

@AloisMahdal, @pirat89, do you expect to have this implemented till the batch 6? I don't think it's realistic.

[pirat89]

Hmm... not sure... I know just one thing, that I need resolve rpm dependencies. But I would help you with that in PA, in case I will have time and you will be able to implement this inside r-u-t then.. Then we can see, whether we it will be prepared or not. But agree, that in case it should be part of the batch, it should be implemented during the next week in the worst case.