Support signaling rebootmgr

[ahkok]

I'd like to figure out a way to make the code support rebootmgr and signal it in case it's available. Essentially, somewhere in the code path after a succesfull installation, we want to essentially do something like this, but only after a kernel was actually installed/changed:

if [ -x /usr/bin/rebootmgrctl ]; then
    rebootmgrctl is-active|grep -q active && rebootmgrctl reboot
fi

[bryteise]

So if we add this into clr-boot-manager it probably needs a new --reboot flag swupd could call it with. I'm actually curious if it wouldn't be better to add to swupd instead though since swupd knows if boot stuff is being updated.

[ahkok]

if swupd knows that clr-boot-mgr succeeded then I'm ok with it.

[bryteise]

I think it ignores clr-boot-manager's return code today but it doesn't have to.

[ahkok]

fair enough, shall I transfer the issue?

[bryteise]

Might as well ask what @otaviobp thinks about this discussion first.