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https://issues.apache.org/jira/browse/MNG-7038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17704286#comment-17704286
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ASF GitHub Bot commented on MNG-7038:
-------------------------------------
w6et commented on PR #1061:
URL: https://github.com/apache/maven/pull/1061#issuecomment-1481644481
> JIRA issue: [[MNG-7038](https://issues.apache.org/jira/browse/MNG-7038)]
Introduce public property to point to a root directory of (multi-module) project
>
> This PR introduces two properties:
>
> * `session.topdir` / `topdir` : _the directory of the topmost project
being built, usually the current directory or the directory pointed at by the
`-f`/`--file` command line argument_. The `topdir` is similar to the
`executionRootDirectory` property available on the session, but renamed to make
it coherent with the new `rootdir` and to avoid using _root_ in its name. The
`topdir` property is computed by the CLI as the directory pointed at by the
`-f`/`--file` command line argument, or the current directory if there's no
such argument.
> * `session.rootdir` / `rootdir` : _the parent directory containing a
`.mvn` subdirectory, usually the directory containing the topmost `pom.xml` of
the project_. The `rootdir` property is roughly the same as the
`${maven.multiModuleProjectDirectory}`, but computed by the CLI. If the
`rootdir` can not be properly determined (usually because there's no `.mvn`
directory), a warning will be printed to the console.
>
> The `topdir` and `rootdir` properties are made available on the
`MavenSession` / `Session` and deprecate the `executionRootDirectory` and
`multiModuleProjectDirectory` properties. The `rootdir` should never change for
a given project and is thus made available for profile activation and model
interpolation. The goal is also to make it available as a system property
during [command line arguments
interpolation](https://github.com/apache/maven/pull/1062).
i think we can define a build.yml\json, generate build-lock.yml\json at
lifecycle process-resources，in build.yml，can load properties file，can define
any public properties with expression(value from sys/user env properties or
properties file)
> 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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