Bug#916036: Install fwupd on a default installation

[Mario.Limonciello at dell.com]

> Just the fact that the update claims that the hardware only accepts
> signed updates or something else? :)

At a minimum a claim.

> I will note - although slightly off-topic to the discussion at hand -
> that it would be useful to people to be able to run their own repository
> of updates and control the rollouts (and staging percentages)
> themselves. I'm not actually suggesting that Debian would need to run
> their own, but it'd be a useful service to the users who don't want to
> send telemetry to the Linux Foundation - and furthermore have a
> significant deployment where it's worth canarying the updates.

Entirely doable.  LVFS can be set up locally with the firmware that is interesting
uploaded to that "instance".  This will mean setting up a GPG key pair and signing
the firmware with that instance as well.

On fwupd clients a "remote" needs to be registered for that instance with the public
key and instance location.

FYI: Telemetry related to the update is entirely optional and "opt-in" after you've
performed an update.

> Fair enough. Do you have a pointer for examples of such updates?
> Unfortunately I updated my own Dell dock recently from Windows, so I
>can't easily check. Mostly I'm interested if it's a proprietary binary
>run on the host. That's its own can of worms. (Which technically is true
>for the EFI update too, but it's staged from outside of Linux on
>boot-up.)

Executing proprietary binaries distributed in the CAB file is against fwupd
philosophy and prohibited.  All code for the plugin that executes in Linux and
is distributed with fwupd must be open source.

fwupd only pulls "payloads" from the CAB files.

Regarding the examples I called out:
You can review the fwupd tree in the plugins/ directory to see the
* thunderbolt/ plugin which uses the kernel Thunderbolt interface
* dell-dock/ plugin which uses kernel USB interfaces
* dell/ plugin which uses a EFI binary for TPM and dock updates
* ebitdo/ plugin which uses kernel USB interfaces
* rts54hid/ rts54hub/ plugins which use kernel USB interfaces

There are many more, you can look more closely at your leisure.

The matching binaries that are on LVFS.
Here's some examples:
Thunderbolt: https://fwupd.org/lvfs/device/4eeb9d07-a96c-56d6-92d3-4a23ee7a6e4a
MST: https://fwupd.org/lvfs/device/be025b25-ca5c-546c-97c6-ee2160ba489d
8bitdo: https://fwupd.org/lvfs/device/8baed357-638e-5b54-b582-0476bf7d6348
TPM: https://fwupd.org/lvfs/device/e58a5f6d-ba78-5f0f-a35f-612f97ca8c9a