[issue37834] readlink on Windows cannot read app exec links

[Steve Dower]

Steve Dower <steve.dower at python.org> added the comment:

> I'm wary of trying to return it without the prefix.

Me too, but suddenly adding "\\?\" to the paths breaks a lot of assumptions.

> We would need a function that's shared with the proposed implementation of realpath() to determine whether the given path (not the final path) is safe to return as a normal DOS or UNC path.

My idea was to GetFinalPathName(path[4:])[4:] and if that fails, don't strip the prefix. Which is obviously not be perfect, but since we're not going to add a check for the LongPathsEnabled flag (let alone any of the other edge cases), we can't easily figure out whether it's safe to return manually.

I really want a fix for this in 3.8, or else os.stat(sys.executable) may fail, but I don't think changing the result of readlink() is okay at this stage. Maybe I'll leave that out for now and just take the st_reparse_tag and stat() changes?

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<https://bugs.python.org/issue37834>
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