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http://jira.codehaus.org/browse/MNG-2576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_106688
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Brian Fox commented on MNG-2576:
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Seems almost exactly what I wrote in this proposal:
http://docs.codehaus.org/display/MAVEN/Make+Like+Reactor+Mode
> Add option to find root of project tree from subproject and build required
> deps
> -------------------------------------------------------------------------------
>
> Key: MNG-2576
> URL: http://jira.codehaus.org/browse/MNG-2576
> Project: Maven 2
> Issue Type: New Feature
> Components: Command Line, Reactor and workspace
> Reporter: Kenney Westerhof
> Priority: Minor
> Fix For: Reviewed Pending Version Assignment
>
>
> Add a commandline option to enable maven to expand the reactor scope to find
> projects that are dependencies
> of the projects currently in the reactor, and add them.
> Currently only the current project and child projects are included in the
> reactor search. I'm proposing
> to add a commandline switch that lets maven check parent directories to find
> the root of the project tree,
> and then do a normal reactor scan, only adding projects that would normally
> not be added if they're needed
> as dependencies of the projects that would normally be built.
> Here's a sample project tree:
> * root
> ** p1
> *** c1 (depends on p2)
> ** p2 (depends on c2)
> ** p3
> *** c2
> And a sample algorithm:
> - When building c1, the reactor would contain [c1].
> - Maven would check p1, then root, etc, using the <parent> tags (without the
> versions!)
> to see if the project is still in the current reactor.
> - It would then create a second list of projects (reactor2) containing ALL
> projects, using the newly discovered root: [root, p1, c2, p2].
> - remove all projects from reactor2 contained in reactor: reactor2 = [root,
> p1, p2]
> - resolve all direct dependencies for all projects in reactor in reactor2 and
> add them to reactor, taking versions into account: reactor = [p2, c1]
> - repeat previous step until all projects have their dependencies resolved
> from reactor 2. first iteration would yield reactor = [c2, p2, c1],
> next iteration would stop since c1 doesn't have any dependencies present in
> reactor2.
> This would ensure that when some local project's sources have changed,
> they'll be incorporated
> in the build, regardless of where you build. So you don't have to do a
> reactor build each time you change more
> than 1 project, and you don't have to remember which projects you changed and
> build them in the correct order
> yourself, manually.
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