[jira] [Created] (MNG-7050) Create M2_REPOSITORY env variable for Local Repository and Wrapper locations

["Manuel Jordan (Jira)" <ji...@apache.org>]

Manuel Jordan created MNG-7050:
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             Summary: Create M2_REPOSITORY env variable for Local Repository and Wrapper locations
                 Key: MNG-7050
                 URL: https://issues.apache.org/jira/browse/MNG-7050
             Project: Maven
          Issue Type: Improvement
          Components: core, maven wrapper, Settings
    Affects Versions: 3.6.3
            Reporter: Manuel Jordan


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:
  
{code:java}
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-#.#.#-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
{code}
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 the downloaded Gradle through the wrapper

*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 any Maven wrapper(s) installed according to that _environment variable_ value (custom location - otherwise {{.m2}} by default) and of course applied for the Local Repository location 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.



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