fake-device-wrapper should bind-mount efivars

[Dimitri John Ledkov]

/usr/share/ubuntu-drivers-common/fake-devices-wrapper should bindmount efivars under testbed.get_root_dir().

Ie. such that /sys/firmware/efi/efivars is correctly available under the umockdev test-bed.

That way when testing subiquity, it should correctly observe if it was booted under secureboot, or not.

Or maybe we can create a few options to fake-devices-wrapper whether or not to present Secureboot.

[Martin Pitt (pitti)]

FTR, I would strongly advise against that, see https://github.com/martinpitt/umockdev/issues/110#issuecomment-736224503 . You want the tests to work independently on the hardware it's running on, so that you can run it on e.g. standard autopkgtest infra.

You could create /sys/firmware/efi/efivars/ tarballs of a bunch of real systems with the properties that you want, keep them in the tests, and unpack these in your test cases. You most probably just need a few of them, so you can strip them down or possibly create them individually as files, but a full tarball might be the quickest start.

[Dimitri John Ledkov (xnox)]

pitti fake-devices-wrapper is not used for testing, usually.

We also use it to run Ubiquity installer and make it pretend that it needs nvidia dkms modules; and we want to complete the VM install in the UEFI mode. Hence we want the wrapper think that UEFI and Secureboot is on; when doing those.