* make a hard-link tree of the files that we want to fit within each image
* add some sym-links within that tree for various reasons
* run mkisofs/genisoimage/whatever on the tree to make the output ISO image
As an alternative, we *could* simply copy all the files that we want into the temp trees, but that costs a vast amount more in terms of disk space and time spent.
Or (as we have done in the past) create a tree of symbolic links instead. But then we've got to resolve where those links point when we build the image to know whether they belong inside or outside and hence how we should resolve them - more complexity.
Hard links are *cute* and I like them. :-)
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