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This is part of the upgrades work. With this tool you
can now switch between versions of the OS, remove a
version, list all the versions present in the system, get
the default version and the running version, and deploy
a new system.
All of the above is possible with the following subcommands:
- list
- deploy
- get-default
- get-running
- remove
- set-default
It also activates a bootloader menu to choose a version
to boot. The menu is important to make sure the user can
boot the old OS if the new kernel doesn't work.
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