nix-files/image.nix
colin ea04b86a68 image builder: make aware of impermanence
now you can boot an impermanent install fully unattended.
2022-06-23 04:48:33 -07:00

85 lines
3.4 KiB
Nix

{ config, lib, pkgs, mobile-nixos, utils, ... }:
let
# return true if super starts with sub
startsWith = super: sub: (
(builtins.substring 0 (builtins.stringLength sub) super) == sub
);
# return the (string) path to get from `stem` to `path`
relPath = stem: path: (
builtins.head (builtins.match "^${stem}(.+)" path)
);
fileSystems = config.fileSystems;
bootFs = fileSystems."/boot";
nixFs = fileSystems."/nix/store" or fileSystems."/nix" or fileSystems."/";
# resolves to e.g. "nix/store", "/store" or ""
storeRelPath = relPath nixFs.mountPoint "/nix/store";
# return a list of all the `device` values -- one for each fileSystems."$x"
devices = builtins.attrValues (builtins.mapAttrs (mount: entry: entry.device) fileSystems);
# filter the devices to just those which sit under nixFs
subNixMounts = builtins.filter (a: startsWith (builtins.toString a) nixFs.mountPoint) devices;
# e.g. ["/nix/persist/var"] -> ["/persist/var"] if nixFs sits at /nix
subNixRelMounts = builtins.map (m: relPath nixFs.mountPoint m) subNixMounts;
makeSubNixMounts = builtins.toString (builtins.map (m: "mkdir -p ./${m};") subNixRelMounts);
uuidFromFs = fs: builtins.head (builtins.match "/dev/disk/by-uuid/(.+)" fs.device);
vfatUuidFromFs = fs: builtins.replaceStrings ["-"] [""] (uuidFromFs fs);
in
{
system.build.img-without-firmware = with pkgs; imageBuilder.diskImage.makeGPT {
name = "nixos";
diskID = "01234567";
# headerHole = imageBuilder.size.MiB 16;
partitions = [
(imageBuilder.fileSystem.makeESP {
name = "ESP";
partitionLabel = "ESP";
partitionID = vfatUuidFromFs bootFs;
# TODO: should this even have a part uuid?
partitionUUID = "CFB21B5C-A580-DE40-940F-B9644B4466E3";
size = imageBuilder.size.MiB 256;
populateCommands = ''
echo "running installBootLoader"
${config.system.build.installBootLoader} ${config.system.build.toplevel} -d .
echo "ran installBootLoader"
'';
})
# TODO: make format-aware
(imageBuilder.fileSystem.makeExt4 {
name = "NIXOS_SYSTEM";
partitionLabel = "NIXOS_SYSTEM";
partitionID = uuidFromFs nixFs;
partitionUUID = uuidFromFs nixFs;
# TODO: what's this?
partitionType = "EBC597D0-2053-4B15-8B64-E0AAC75F4DB1";
populateCommands =
let
closureInfo = buildPackages.closureInfo { rootPaths = config.system.build.toplevel; };
in
''
mkdir -p ./${storeRelPath}
# TODO: we should either fix up the owners (and perms?), or only create the bare minimum needed for boot (i.e. /var/*)
${makeSubNixMounts}
echo "Copying system closure..."
while IFS= read -r path; do
echo " Copying $path"
cp -prf "$path" ./${storeRelPath}
done < "${closureInfo}/store-paths"
echo "Done copying system closure..."
cp -v ${closureInfo}/registration ./nix-path-registration
'';
})
];
};
system.build.img = lib.mkDefault config.system.build.img-without-firmware;
# TODO: pinephone build:
# system.build.img = pkgs.runCommandNoCC "nixos_full-disk-image.img" {} ''
# cp -v ${config.system.build.without-bootloader}/nixos.img $out
# chmod +w $out
# dd if=${pkgs.tow-boot-pinephone}/Tow-Boot.noenv.bin of=$out bs=1024 seek=8 conv=notrunc
# '';
}