Calculate free space in sync ops #8
Description
CBM was absolutely talented in bricking installs by not caring about the volume free space prior to syncing to the ESP.
- Ensure free space before mutating sources.
- Early-nuke of unreferenced boot environments before starting work, to remove anything CBM left behind...
- GC
/usr/lib/kernelpolicy for non-atomic distros (ie not Serpent/Solus 5)