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Fix
Files.createTempDir
and FileBackedOutputStream
under Windows.
Based on [some discussions in GitHub](#6535 (comment)), I'm under the impression that Windows would create the temporary directory/file in a secure location even if our call to `java.nio.file.Files.createTempDirectory`/`createTempFile` passes no ACL attribute. However, in case we are in an unusual situation (Linux with NFS temporary directory???) in which ACLs are supported but the temporary directory is _not_ a secure location, I've arranged for the file to be created with an ACL that grants permissions only to the current user. I set the user's permissions to the ones that I saw on a file created in the temporary directory under Java's default settings, and I didn't do anything to set the additional permissions I was seeing for administrators. The resulting file's permissions look plausibly correct in the Windows property dialog, if slightly different than what I get when creating a file/directory myself through Explorer. Fixes #6535 Relates to: - #4011 - #2575 - #2686. (It sure would be convenient to have Windows CI set up!) RELNOTES=`io`: Fixed `Files.createTempDir` and `FileBackedOutputStream` under Windows. PiperOrigin-RevId: 538492945
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