Maven functionality to download all dependencies for all plugins once.
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         Key: MAVEN-1597
         URL: http://jira.codehaus.org/browse/MAVEN-1597
     Project: maven
        Type: Wish
  Components: plugin manager  
    Versions: 1.0.2    
    Reporter: Davy Toch
    Priority: Minor


It would be nice to have a Maven command-line switch or a standard plugin goal 
that allows to download all dependencies of all unpacked plugins once.

The following Jelly script should give you an idea of what I mean (used in a 
custom maven.xml in one of our Maven projects):

  <!-- A custom simple POM file containing only the mandatory
  fields. This file is necessary because almost
  all plugins inherit from a parent POM -->
  <property name="prj.file" 
    value="conf/plugin-bootstrapper-parent-pom.xml"/>

  <!-- Some plugins inherit from the following parent POM -->
  <copy file="${prj.file}" 
    tofile="${maven.home.local}/default-project.xml"/>

  <!-- Some plugins inherit from the following parent POM -->
  <copy file="${prj.file}" 
    tofile="${maven.plugin.unpacked.dir}/default-project.xml"/>

  <!-- Some plugins inherit from the following parent POM -->
  <copy file="${prj.file}" 
      tofile="${maven.plugin.unpacked.dir}/plugin-parent/project.xml"/>

  <!-- Apparently, the following action downloads all
  dependencies for all unpacked plugins 
  It is important to put */project.xml (and not **/project.xml) 
  as value for the attribute includes, because e.g. the genapp
  plugin directory has several project.xml files.
  -->
  <m:reactor basedir="${maven.plugin.unpacked.dir}" includes="*/project.xml"
    goals="clean" banner="Initializing plugin ... " ignoreFailures="false"/>

Additional wish : it would be convenient if all Maven plugins inherit from the 
same parent POM (or not at all), in order to simplify the above script.

Regards,
Davy Toch

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