On Mon, 27 Oct 2025 23:24:35 GMT, Brian Burkhalter <[email protected]> wrote:

>> `File.getCanonicalPath` invokes `GetFinalPathNameByHandle` on the result of 
>> `canonicalize0` which causes the drive letter of a mapped drive to be 
>> converted to a UNC prefix. If such a substitution is detected, this request 
>> proposes to revert the conversion of drive letter to UNC prefix before 
>> returning the canonical path.
>
> Brian Burkhalter has updated the pull request with a new target base due to a 
> merge or a rebase. The incremental webrev excludes the unrelated changes 
> brought in by the merge/rebase. The pull request contains 11 additional 
> commits since the last revision:
> 
>  - 8355342: Derive final path only for reparse points
>  - Merge
>  - 8355342: Remove unused, vestigial code
>  - 8355342: Do not check for backslash as third character of input pathname 
> string
>  - 8355342: Fall back to canonicalize0() result if drive letter converted to 
> a long / UNC prefix
>  - Merge
>  - Merge
>  - 8355342: Corrected a comment
>  - 8355342: Add missing space in constant declaration
>  - 8355342: Fix possible sneaky NullPointerException
>  - ... and 1 more: https://git.openjdk.org/jdk/compare/642989f9...e4cad2b1

The updated approach in e4cad2b1 to get the final path when a reparse point is 
encountered looks good. That removes the use of GetFinalPathNameByHandle for 
the common cases where there is no sym link. It also aligns the behavior with 
Path::toRealPath. I'll do a detailed pass over the changes (to check for any 
overflows and other details) as soon as I can.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/27324#issuecomment-3454946923

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