[GitHub] mkarg commented on issue #5: Parameter `fileMapper` for unpack path rewriting

[GitBox <gi...@apache.org>]

mkarg commented on issue #5: Parameter `fileMapper` for unpack path rewriting
URL: https://github.com/apache/maven-dependency-plugin/pull/5#issuecomment-423752749
 
 
   Believe me, it was the perfectly correct choice to provide *exactly this* solution, and we really need this complete freedom of mapping! ;-)
   
   First of all, the assembly plugin has the same problem: It cannot *freely* rewrite target paths, but this is what we actually solved. Second, as we do not want to create assemblies at all, it would simply be a misuse; what we actually want is to unpack dependencies, so the correct way *is* to dependency:unpack and nothing else.
   
   In cour case, what we needed is to invoke external tools as part of our build process which expects a particular directory hierarchy. The source of the files in that hierarchy come from several *external* dependencies (ZIP files), i. e. their content is not under our control. The problem is: The tools expect a completely different hierarchy than the one found in the ZIPs. For example, each ZIP has some kinde of parent folders structure inside, but the tool wants a different parent structure:
   ```
   Dependency ZIP A:
   /a/b/C
   
   Dependency ZIP B:
   /d/e/F
   
   Tool can only process *exactly this* folder structure:
   /u/v/w/C
   /x/y/z/F
   ```
   The solution of extending the dependency plugin is clean and straightforward: We now can simply add the RegExMapper config within each `<ArtifactItem>` in the unpack config.
   
   So to sum up: It was the perfectly correct way to fork and extend the dependecy plugin. Everything else would just be a bad hack. ;-)

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