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https://issues.apache.org/jira/browse/MNG-7038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17702076#comment-17702076
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Christoph Läubrich commented on MNG-7038:
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I think instead of rootdir, "maven.config.directory" would be more suitable (as
it contains maven.config, jvm.config and extensions.xml, possibly extension
specific config files as well)
"topdir" also sounds strange maybe better something like
"maven.execution.directory"
> Introduce public property to point to a root directory of (multi-module)
> project
> --------------------------------------------------------------------------------
>
> Key: MNG-7038
> URL: https://issues.apache.org/jira/browse/MNG-7038
> Project: Maven
> Issue Type: Improvement
> Reporter: Envious Guest
> Priority: Major
> Fix For: Issues to be reviewed for 4.x
>
>
> This is a request to expose a property *maven.multiModuleProjectDirectory*
> which is currently internal (or introduce a brand new one with analogous
> functionality).
> * For a single-module project, its value should be same as *project.basedir*
> * For multi-module project, its value should point to a project.basedir of a
> root module
> Example:
> multi-module // located at /home/me/sources
> +- module-a
> +- module B
> Sample multi-module/pom.xml:
> {{<project>}}
> {{ <parent>}}
> {{ <groupId>com.acme</groupId>}}
> {{ <artifactId>corp-parent</artifactId>}}
> {{ <version>1.0.0-RELEASE</version>}}
> {{ </parent>}}
> {{ <groupId>com.acme</groupId>}}
> {{ <artifactId>multi-module</artifactId>}}
> {{ <version>0.5.2-SNAPSHOT</version>}}
> {{ <modules>}}
> {{ <module>module-a</module>}}
> {{ <module>module-b</module>}}
> {{ </modules>}}
> {{</project>}}
> The property requested should return /home/me/sources/multi-module,
> regardless of whether it's referenced in any of the child modules (module-a,
> module-b) or in multi-module.
> Note that multi-module itself has parent (e.g. installed in a local
> repository), so the new property should be smart enough to detect it and
> still point to /home/me/sources/multi-module instead of the local repository
> where the corp-parent is installed.
> The use-case for such a property could be to have a directory for combined
> report of static analysis tools. Typical example - jacoco combined coverage
> reports.
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