[jira] [Created] (MBUILDCACHE-73) Add project version as additional property for reconcilation

["Patrik Dudits (Jira)" <ji...@apache.org>]

Patrik Dudits created MBUILDCACHE-73:
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             Summary: Add project version as additional property for reconcilation
                 Key: MBUILDCACHE-73
                 URL: https://issues.apache.org/jira/browse/MBUILDCACHE-73
             Project: Maven Build Cache Extension
          Issue Type: New Feature
    Affects Versions: 1.0.1
            Reporter: Patrik Dudits


Certain plugins or goals might require to run when project version changes regardless of other inputs. A typical example would be {{deploy:deploy}} or in my specific case {{docker:build}} - It is OK to reuse the build artifact, but if version changed, I do want to upload it.

Currently only way to achieve that is  to put the goal into {{runAlways}} section. But that results in needles snapshots to be deployed or docker images being built even if there's no relevant change.

The reconcile section allows to specify properties for futher fine tuning the input. These are limited to goal parameters, and neither of my examples contain project version as a parameter, both use project model to fetch it.

Proposal would be to extend tag {{reconcile}} either with:
 * special magic name {{project.version}} to include version tracking, so this could be achieved by {{<reconcile propertyName="project.version"/>}}
 * attribute {{{}expression{}}}, to achieve the result with {{<reconcile propertyName="version" expression="${project.version}"/>}}
* interpolating {{defaultValue}} attribute

The second form would be preferrable as it has much larger scale of application, I can imagine putting base docker image digests in environment variable to invalidate builds when base tag gets updated. It is also more discoverable than third option.



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