Acceptance criteria:

• Implementation for the client that uses grub related commands for boot sequence manipulation (see )

• One of the following (but probably not both):

  1. Build option which enabled Grub code path instead of U-Boot (for example using the +build directive in Go source files)

  2. Configuration option in mender.conf which determines commands during runtime instead.

• Slight preference to option 1 above, since one of the code paths will always be dead code on any given platform. But not if it gets too complicated

• Both partition flipping, rolling back, and committing must be covered