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https://issues.apache.org/jira/browse/HADOOP-9483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634244#comment-13634244
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Chris Nauroth commented on HADOOP-9483:
---------------------------------------
Ivan and Chuan, thank you for the feedback. A couple of follow-up questions:
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. For example:
{code}
chris@Chriss-MacBook-Pro:ttys000] ~
> pwd
/Users/chris
[chris@Chriss-MacBook-Pro:ttys000] ~
> mkdir testlink
[chris@Chriss-MacBook-Pro:ttys000] ~
> cd testlink
[chris@Chriss-MacBook-Pro:ttys000] testlink
> ln -sfn .././hello
[chris@Chriss-MacBook-Pro:ttys000] testlink
> ll
total 8
lrwxr-xr-x 1 chris staff 10B Apr 17 10:45 hello@ -> .././hello
[chris@Chriss-MacBook-Pro:ttys000] testlink
> readlink hello
.././hello
{code}
Link to docs on {{GetFinalPathNameByHandle}}:
http://msdn.microsoft.com/en-us/library/windows/desktop/aa364962(v=vs.85).aspx
If you're not sure of the answer, then I'll experiment with the 2 functions to
determine the behavior.
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?
> 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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