[Bug 56647] ntdll-Junction_Points prevent rustup from correctly installing a toolchain

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=56647

--- Comment #5 from Erich E. Hoover  ---
(In reply to Lorenzo Ferrillo from comment #4)
> Eric the issue here is that these folders aren't symlinks, they are unix
> mountpoints, and readlink doesn't work for them. 
> IO_REPARSE_TAG_MOUNT_POINT is setted only if S_ISDIR is true and the folder
> device is different then the parent device, or their inode are the same. The
> function for that is fd_is_mount_point and pre-exist the
> ntdll_Junction-Points patchset however they weren't actually setted without
> implementing FILE_OPEN_REPARSE_POINT usage.

Oh, I thought you were talking about a symlink to a different drive.  I'll have
to think about how a real mount point should behave here...