[MNG-7050] Create M2_REPOSITORY env variable for Local Repository and Wrapper locations

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Incomplete
• Affects Version/s: 3.6.3
• Component/s: Core, Maven Wrapper, Settings
• Labels: features
• External issue URL: https://stackoverflow.com/questions/65204834/how-define-for-mavens-environment-variable-to-define-local-repository-and-wrapp
• Assignee: Unassigned
• Reporter: Manuel Jordan
• Created: 09/Dec/20 01:11
• Updated: 04/Apr/23 07:14
• Resolved: 04/Apr/23 07:14

Description

I need do mention about Gradle to understand and find the same solution or approach for Maven.

In Gradle exists the GRADLE_HOME and GRADLE_USER_HOME (repository) environment variables, for Maven the former through M2_HOME and about the repository I use the settings.xml file to define the <localRepository> location

For both Maven and Gradle I can define in peace the place about where is installed the software, for example other location than .m2 and .gradle to a secondary disk and even with customized directory names. Same goal about the repository location, both for a secondary disk (remember for Maven through the settings.xml file)

Note: therefore .gradle and .m2 are empty and not used.

In Gradle about the wrapper created, the gradle-wrapper.properties file has:
 

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-#.#.#-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

Then the final path is: GRADLE_USER_HOME/wrapper/dists 

Therefore observe how GRADLE_USER_HOME (custom location - otherwise .gradle by default) is used to define the:

• Local repository
• Base path to install - by downloading and unpacking - Gradle through the wrapper settings

New Improvement: Add for Maven an environment variable named M2_REPOSITORY for the Local Repository and Wrapper Installation locations that Maven should recognize automatically (not using the settings.xml file).

It with the purpose to have each Maven wrapper installed/located according to that environment variable value (therefore defining a custom location - otherwise .m2 by default) and of course to define/set the Local Repository location to be used for that Maven wrapper too.

Observation: If the settings.xml file exists it should override the M2_REPOSITORY value. 

Therefore: I need the maven-wrapper.properties using something like M2_REPOSITORY (custom location - otherwise .m2 by default) according the developer/user in its machine.

The goal is make possible define for each Maven Wrapper a custom location to be installed/unpacked and in the same time define the custom location of the Local Repository for the same Maven Wrapper too. Both locations using the M2_REPOSITORY environment variable