[Haskell-cafe] How to move files?

☂Josh Chia (謝任中) joshchia at gmail.com
Thu Apr 15 04:32:16 UTC 2021

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

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