Having a disks object with a dictionary of all the disks and their properties makes it easier to process multi-disk images. Note the rename of `label` to `system_label` is because `$label`i is something of a special token to jq. (cherry picked from commit 71b3d18181974523ef7264106a4bf213a3103439)
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.