The DFU specification specifies that only one of the DFU interfaces has to
export a functional descriptor; I assumed they all had to. Adding support
for this kind of device rapidly turned into a massive restructure and it was
all too complicated anyway.
Reorganise the code so that we can support these kinds of devices and clean up
the API so it's sane and easy to use. This also allows us to generate the
GObject introspection GIR and to also install libdfu as a shared library.
If you've got any comments about the API, please shout now as when 6.0 is
released it will become API and ABI stable.
This downloads the latest version of the firmware and applies it to any
matching hardware. e.g.
$ fwupdmgr update
Downloading 1.2.3 for ColorHug...
Updating 1.2.3 on ColorHug...
* Loading firmware
* Decompressing firmware
* Restarting device
* Writing firmware to device
* Verifying firmware from device
* Restarting device
Done!
It seems a little odd to call it 'Update' when it's being used for downgrading
and reinstalling as well.
As we're making things simpler, just use a single 'install' action in fwupdmgr
rather than 'install', 'update-online', 'update-offline'. We can use the flags
and fallbacks to do the right thing in all cases, and make the typical case
(installing a local file to any matching hardware) simple.
Fixes half of https://github.com/hughsie/fwupd/pull/23
