The source code to mv.c might be useful: https://github.com/coreutils/coreutils/blob/master/src/mv.c 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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