{ fileSystems = { "/" = { device = "/dev/disk/by-label/root"; fsType = "ext4"; options = ["auto"]; }; "/boot" = { device = "/dev/disk/by-label/BOOT"; fsType = "vfat"; options = ["fmask=0022" "dmask=0022"]; }; }; swapDevices = [{device = "/dev/disk/by-label/swap";}]; }