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http://jira.codehaus.org/browse/MNG-4368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=201624#action_201624
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Paul Benedict commented on MNG-4368:
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I think the problem here is that you are dirtying your target directory while
performing all these switches. I don't mean to sound anything but polite, but I
have never seen anyone ever do that; separate checkout directories are the
norm. If you switch back and forth, you should clean the target first.
> DefaultArtifactInstaller should only overwrite files if timestamp has changed
> -----------------------------------------------------------------------------
>
> Key: MNG-4368
> URL: http://jira.codehaus.org/browse/MNG-4368
> Project: Maven 2
> Issue Type: Improvement
> Environment: Linux, JDK 1.5
> Reporter: Johannes Martin
> Fix For: 2.2.2, 3.0-alpha-3
>
>
> install:install (from maven-install-plugin) by default uses
> DefaultArtifactInstaller to install artifacts. DefaultArtifactInstaller in
> turn uses FileUtils.copyFile(), thereby overwriting destination files even if
> they are unchanged. It would be helpful if DefaultArtifactInstaller used
> FileUtils.copyFileIfModified() instead, at least as an option, to speed up
> the build process.
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