Hi @drewmoseley. I’ve added the regexp command to the grub.cfg script used by mender and I get the message “unknown command” when it tries to execute it. I’ve noticed that other important grub2 commands (like help) also give this message when I try them out on the command line. The list of known commands see when pressing tab in the command shell is also much shorter than the one I saw when the boot into the Grub 2.02 shell happened (when the ubuntu directory was still a part of /EFI). So it seems that the regexp command is not built into the grub2 2.04 shell or something is missing that added that command to the Grub2 2.02 shell. Maybe in order for these commands to be built into Grub2 a change from default to a different level is needed?
I’ll try and see if I can find out how mender-convert builds/uses grub2.