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https://issues.apache.org/jira/browse/IO-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17814090#comment-17814090
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Elliotte Rusty Harold commented on IO-384:
------------------------------------------
This issue is probably obsolete. FileUtils.copyFile now uses the Files.copy
method in the JDK. doCopyFile and the implementation described here no longer
exist.
> New FileUtils method to copy file which might change in size
> ------------------------------------------------------------
>
> Key: IO-384
> URL: https://issues.apache.org/jira/browse/IO-384
> Project: Commons IO
> Issue Type: New Feature
> Reporter: Sebb
> Priority: Major
>
> As mentioned in IO-383, FileUtils.doCopyFile caches the file size.
> This means that a growing file (e.g. a log file) may cause the method to
> report failure.
> It might be useful to have a method which keeps looping until there is no
> more input; this should not throw an IOE if the sizes are different.
> More data may have been added - or the file truncated - between completing
> the copy and checking the size.
> The method should return the total bytes written; the caller can then check
> if the count is OK.
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