Introduce Baseline Report for Validating Bundle Versions

[toniedzwiedz]

The Maven Bundle Plugin automatically detects changes in public packages and checks if a version update is required.
Example:

[INFO] Baseline Report - Generated by Apache Felix Maven Bundle Plugin on 2018-08-17T12:30Z based on Bnd - see http://www.aqute.biz/Bnd/Bnd
[INFO] Comparing bundle org.apache.sling.dynamic-include version 3.2.0-SNAPSHOT to version 3.1.2
[INFO]
[INFO]   PACKAGE_NAME                                       DELTA      CUR_VER    BASE_VER   REC_VER    WARNINGS
[INFO] = ================================================== ========== ========== ========== ========== ==========
[INFO] * org.apache.sling.dynamicinclude                    major      4.0.0      4.1.0      5.0.0      Version increase required
[INFO]      > class org.apache.sling.dynamicinclude.Configuration
[INFO]          - method getExtension()
[INFO]              - return java.lang.String
[INFO]          - method hasExtension(org.apache.sling.api.SlingHttpServletRequest)
[INFO]              - return boolean
[INFO]          - method hasExtensionSet()
[INFO]              - return boolean
[INFO]      < class org.apache.sling.dynamicinclude.IncludeTagFilter
[INFO]          + method foo()
[INFO]              + return java.lang.String
[INFO]      + version 4.0.0
[INFO]      - version 4.1.0
[INFO] -----------------------------------------------------------------------------------------------------------
[INFO]   org.apache.sling.dynamicinclude.generator          unchanged  3.0.0      3.0.0      3.0.0      -
[INFO] -----------------------------------------------------------------------------------------------------------
[INFO]   org.apache.sling.dynamicinclude.generator.types    unchanged  3.0.0      3.0.0      3.0.0      -
[INFO] -----------------------------------------------------------------------------------------------------------
[INFO]   org.apache.sling.dynamicinclude.pathmatcher        unchanged  3.0.0      3.0.0      3.0.0      -
[INFO] -----------------------------------------------------------------------------------------------------------
[ERROR] org.apache.sling.dynamicinclude: Version increase required; detected 4.0.0, suggested 5.0.0
[INFO] Baseline analysis complete, 1 error(s), 0 warning(s)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 25.715 s
[INFO] Finished at: 2018-08-17T12:30:27+02:00
[INFO] Final Memory: 42M/377M
[INFO] ------------------------------------------------------------------------

Consider introducing this feature in the OOTB setup. Since this project is aimed at libraries and tools rather than projects, maintaining this kind of compatibility should be enabled by deafult.

[pun-ky]

probably it is possible even right now by just specyfing BND configuration by one of possible ways: https://github.com/Cognifide/gradle-aem-plugin/blob/master/src/main/kotlin/com/cognifide/gradle/aem/api/AemConfig.kt#L136-L158