This hack tries to interpret the commandline based on what Pixiecore v1
did, before handing off to the fancier v2 CLI logic.
Doesn't support API mode yet, since that's not yet implemented in
the library.
These flags are both for providing binaries when running the apache2
version of pixiecore (which doesn't have builtin ipxe), and for
overriding the builtin version if desired.
The cli package is meant for single-shot execution anyway, so
instead of plumbing everything through reentrantly, let's just
have a global you can seed before calling CLI().
The two binaries (Apache2 and GPL) both invoke the cli package to do
the work, the only difference between them is that the GPL binary passes
it embedded ipxe binaries.
