Support for multiple <reference>s

[neven@…]

When fetching file from <reference> fails, we should check for another one.

[kpfleming@…]

Will combine code from new-download and new-unpack into library this weekend, which will resolve this issue. Please assign to me.

[kpfleming@…]

patch committed to CVS

[neven@…]

I would add some new functions in there, it started to turn into spaghetti code a bit (continue, break, goto -- all in one).

But it's not a big deal of course -- it works, which is important. :-)

[kpfleming@…]

Yeah, my first plan was to create get_urls() and pass it the name of the multi-instance element that holds the URLs. Problem with that is that <download> and <unpack> construct their URLs differently (<reference> is a complete URL, where <url> is only a prefix), so that would get_urls() would need a callback to a function to create the final URL... too much pain for little gain. Maybe just break out the code into a separate function in each handler, but not try to consolidate them.

When it comes time to add <reference> support to <patch> as I want to do, I'll revisit this topic.