Note: These are some instructions for how to do this, but I haven't been able to get this to work.
Create an empty ISO file. Move to an empty directory and run the following.
mkisofs -o test.iso .
Now you can mount the ISO image to /mnt/test with the following command.
mount -t iso9660 -o loop test.iso /mnt/test
More help might be here, but I can't get this to work (writable).
https://help.ubuntu.com/community/MountIso
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