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https://issues.apache.org/jira/browse/LUCENE-6438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Rowe updated LUCENE-6438:
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    Attachment: LUCENE-6438.patch

Patch that fixed the problem for me, from last year, but the idea will still 
apply even if the patch won't.

I haven't run into this problem recently, so I can't say for sure whether the 
sync-hack removal fixed all of the problems.

> Improve clean-jars when dealing with symbolic links.
> ----------------------------------------------------
>
>                 Key: LUCENE-6438
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6438
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>         Attachments: LUCENE-6438.patch
>
>
> Ever since I started seeing jars in the lib folders use symbolic links on 
> linux I've run into jar problems when working with an old checkout or 
> switching branches on a git checkout. You would normally expect ant 
> clean-jars to help, but it didn't and led to some headaches and random bs.
> Turns out, clean-jars is not properly removing all symbolic links for me. 
> I've seen two cases - symbolic links to jars that are not removed and broken 
> symbolic links to jars.
> I can get rid of the symbolic links with the following:
> {code}
>   <target name="clean-jars" description="Remove all JAR files from lib 
> folders in the checkout">
>     <delete failonerror="true" removeNotFollowedSymlinks="true">
>       <fileset dir="." followsymlinks="false">
> {code}
> But that doesn't work with the broken links.
> I guess you can remove those with the Ant Symlink task, but it seems only 
> specifically one at a time which is not that useful.



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