On Thu, 17 Oct 2024 00:05:26 GMT, Brian Burkhalter <b...@openjdk.org> wrote:

> Improve support for Windows directory junctions.

A Windows directory junction is an empty (void) directory which has a reparse 
point with tag `IO_REPARSE_TAG_MOUNT_POINT` and a data buffer containing the 
name of the target of the junction, which must be an absolute path beginning 
with a drive letter. The  absolute path is usually expected to be to a 
directory, although it is possible, but perhaps non-standard, that it could be 
to a regular file. At present, directory junctions are in general handled 
transparently by Java in the same manner as symbolic links.

This request proposes to make directory junctions be seen as symbolic links by 
having `Files.isSymbolicLink(junction)` return `true` and to return the target 
of the directory junction from `Files.readSymbolicLink(junction)`. The 
behaviors of these two methods are the only visible changes.

Two tests are added to verify the expected behavior with junctions, one for 
`java.io` and the other for `java.nio.file`. Both of these tests already pass 
without the proposed source changes except for the sub-tests which verify the 
changes underlying the `Files.isSymbolicLink` and `Files.readSymbolicLink` 
methods on Windows.

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PR Comment: https://git.openjdk.org/jdk/pull/21555#issuecomment-2418188336

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