> If the file system supports snapshots, then the package manager could automatically ensure fully atomic package upgrades. That's exactly what openSUSE / SLE

> If the file system supports snapshots, then the package manager could automatically ensure fully atomic package upgrades. That's exactly what openSUSE / SLE do with snapper. Every upgrade or package install with YaST/zypper creates two snapshots (before/after) and you can easily rollback to an older snapshot (even doing so from GRUB). This has been enabled by default for years.