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https://issues.apache.org/jira/browse/HADOOP-9483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634816#comment-13634816
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Ivan Mitic commented on HADOOP-9483:
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bq. First, regarding DeviceIoControl vs. GetFinalPathNameByHandle, I have not
been able to determine from reading documentation if the "final" path name
would also get canonicalized/made absolute. The behavior of Unix readlink is
that it does not make the returned value absolute/canonicalized, so a relative
path in a symlink would be preserved as is.
Good question. I'm also not sure, you'll have to test this out.
bq. Second, when we say that we should not support junction points, does that
mean that winutils readlink should fail fast and return an error if it's being
called on a junction point?
Thanks, failing early would be nice to have functionality (although not
strictly needed imo). There is an existing winutils API that checks whether the
given path is a junction point, so this should be easy to add.
> winutils support fo readlink command
> ------------------------------------
>
> Key: HADOOP-9483
> URL: https://issues.apache.org/jira/browse/HADOOP-9483
> Project: Hadoop Common
> Issue Type: Improvement
> Components: util
> Affects Versions: 3.0.0
> Reporter: Chris Nauroth
>
> The current codebase relies on the Unix readlink command to determine the
> target of a symlink on the local file system. winutils currently does not
> support this functionality on Windows. Adding the command to winutils will
> prevent the need to use GnuWin32 or Cygwin for readlink support.
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