[Haskell-cafe] How to move files?

[☂Josh Chia (謝任中)]

I'm trying to write to a temp file in /tmp and then move it to another
location that may be in /tmp.

If I use System.Directory.renameFile and the final location is in another
filesystem, I'll get an error "renameFile:renamePath:rename: unsupported
operation (Invalid cross-device link)".

If I copy to the new location and then remove the temp file, but the new
location is also in /tmp, I am doing an unnecessary copy (instead of mv),
which is inefficient.

I don't know how to detect whether two filepaths are in the same filesystem.

What's the best way to move the file if possible but copy-and-delete if
necessary?

Josh
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