TPM device is a hard requirement

[mudler]

Can't join nodes that don't have a TPM device, getting the following error when calling ros-installer -config-file /oem/userdata.yaml:

ERRO[0000] failed to read registration URL https://xx.lan/v1-rancheros/registration/xxxx, retrying: opening tpm: TPM device not available

This is an issue at least for running vagrant images as VirtualBox currently doesn't support TPM, but applies to other hypervisors including raspberrypi4 and baremetal which don't have the TPM hardware in general

Note, this doesn't seem to be an issue for libvirt/qemu: https://documentation.suse.com/sles/15-SP3/html/SLES-all/tpm.html
stefanberger/swtpm#33

See also: stefanberger/swtpm#33

[mudler]

One way to do that with swtmp is to set a different CommandChannel when we read the TPM device here:
https://github.com/rancher/rancherd/blob/bdf5642d62d50b9cd23eaabfdc848637bf62e056/pkg/tpm/tpm.go#L37 pointing for e.g. to swtmp socket

[kkaempf]

Please see https://rancher.github.io/elemental/ for a successor of 'os2'.
and esp. rancher/elemental-operator#235