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https://issues.apache.org/jira/browse/MNG-7774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17718587#comment-17718587
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ASF GitHub Bot commented on MNG-7774:
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cstamas closed pull request #1097: [MNG-7774] Maven config and command line
interpolation
URL: https://github.com/apache/maven/pull/1097
> Maven config and command line interpolation
> -------------------------------------------
>
> Key: MNG-7774
> URL: https://issues.apache.org/jira/browse/MNG-7774
> Project: Maven
> Issue Type: Task
> Components: Command Line
> Reporter: Tamas Cservenak
> Assignee: Tamas Cservenak
> Priority: Major
> Fix For: 3.9.2
>
>
> Note: this issue "mildly follows" functionality done in Maven 4 as part of
> MNG-7038 and MNG-6303, with partial implementation only (is not full
> back-port), hence "mild introduction".
> Rationale: many new resolver features are akin to be able to store their
> configuration and input along SCM tracked Maven project sources. Sadly,
> currently this is not possible. The two issues targeting Maven4 (MNG-7038 and
> MNG-6303) with introduction of session and project "topDirectory" and
> "rootDirectory" properties solve this. Still, Maven 3.9.x does not need all
> of this.
> So, idea is following:
> * extend MavenCli to interpolate Maven arguments
> * introduce two special properties {{session.rootDirectory}} and
> {{session.topDirectory}} in interpolation. They are special, as they may not
> be defined, and IF they are not defined, their use in Maven argument
> interpolation causes error (Maven will not boot).
> * limit the use of the two new properties to Maven CLI interpolation only.
> This makes projects relying on Maven CLI interpolation "permeable" between
> Maven 3.9.x and Maven 4, while all the whistle and bells (exposing this via
> session or project) will be available in Maven 4 only.
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