[Haskell-cafe] How to move files?

David Kraeutmann kane at kane.cx
Thu Apr 15 04:40:36 UTC 2021

The source code to mv.c might be useful:


On 4/15/21 12:32 AM, ☂Josh Chia (謝任中) wrote:
> 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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