[ARCHETYPE-550] multi-module partial archetype not supported

**[Erwin Guib](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=eguib)** opened **[ARCHETYPE-550](https://issues.apache.org/jira/browse/ARCHETYPE-550?redirect=false)** and commented

When one generates an partial multimodule archetype on top of an existing multimodule project this will not work.

The message "Modules ignored in partial mode" and the archetype is not applied.

Applying an partial multimodule archetype on an existing multimodule project should work as for "simple" projects:
* existing pom/module poms are merged
* new modules are added to the multimodule project
* new files are added to the project
* attempt to overwrite an existing file triggers an error

Attached a (git diff > fileName) patch that fixes the issue.

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**Affects:** 3.0.1, 3.1.0

**Attachments:**
- [ARCHETYPE-550_maven-archetype.patch](https://issues.apache.org/jira/secure/attachment/12927677/ARCHETYPE-550_maven-archetype.patch) (_11.15 kB_)

1 votes, 2 watchers

Start with the attached ARCHETYPE-550_maven-archetype.patch and the partial multimodule archetype generation path. Reproduce generation on an existing multimodule project, then verify that existing POMs are merged, new modules and files are added, and overwriting an existing file reports an error.

Written by the indexing model from the issue text.