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https://issues.apache.org/jira/browse/LUCENE-5650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13991164#comment-13991164
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Robert Muir commented on LUCENE-5650:
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Really this should be fixed here too (IMO).
I tried to do this, but its currently hung on issues in a couple solr contribs:
LUCENE-5154
> createTempDir and associated functions no longer create java.io.tmpdir
> ----------------------------------------------------------------------
>
> Key: LUCENE-5650
> URL: https://issues.apache.org/jira/browse/LUCENE-5650
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Ryan Ernst
> Assignee: Dawid Weiss
>
> The recent refactoring to all the create temp file/dir functions (which is
> great!) has a minor regression from what existed before. With the old
> {{LuceneTestCase.TEMP_DIR}}, the directory was created if it did not exist.
> So, if you set {{java.io.tmpdir}} to {{"./temp"}}, then it would create that
> dir within the per jvm working dir. However, {{getBaseTempDirForClass()}}
> now does asserts that check the dir exists, is a dir, and is writeable.
> Lucene uses {{"."}} as {{java.io.tmpdir}}. Then in the test security
> manager, the per jvm cwd has read/write/execute permissions. However, this
> allows tests to write to their cwd, which I'm trying to protect against (by
> setting cwd to read/execute in my test security manager).
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