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Nix
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src, dst, trees_file, mods_file = sys.argv[1:5] KEEP_TREES = open(trees_file).read().split() KEEP_MODS = open(mods_file).read().split()
def norm(name): return name.replace("-", "_")
kerneldir = os.path.join(src, "kernel")
bypath, byname = {}, {} for root, _, files in os.walk(kerneldir): for f in files: if ".ko" not in f: continue ap = os.path.join(root, f) rel = os.path.relpath(ap, src) bypath[rel] = ap byname[norm(f.split(".ko")[0])] = rel
deps = {} with open(os.path.join(src, "modules.dep")) as fh: for line in fh: if ":" in line: mod, rest = line.split(":", 1) deps[mod.strip()] = rest.split()
keep = set() def add(rel): if rel in keep or rel not in bypath: return keep.add(rel) for dep in deps.get(rel, []): add(dep)
for tree in KEEP_TREES: for root, _, files in os.walk(os.path.join(kerneldir, tree)): for f in files: if ".ko" in f: add(os.path.relpath(os.path.join(root, f), src)) for mod in KEEP_MODS: rel = byname.get(norm(mod)) if rel: add(rel)
for rel in keep: target = os.path.join(dst, rel) os.makedirs(os.path.dirname(target), exist_ok=True) shutil.copy2(bypath[rel], target) print(f"kept {len(keep)} of {len(bypath)} modules") ''; slimKernelModules = pkgs.runCommand "${config.boot.kernelPackages.kernel.name}-modules-microvm" {nativeBuildInputs = [pkgs.python3 pkgs.kmod];} '' src=${lib.getOutput "modules" config.boot.kernelPackages.kernel}/lib/modules ver=$(ls "$src") mkdir -p "$out/lib/modules/$ver" for f in "$src/$ver"/modules.builtin* "$src/$ver"/modules.order; do [ -e "$f" ] && cp "$f" "$out/lib/modules/$ver/" done python3 ${slimModulesScript} "$src/$ver" "$out/lib/modules/$ver" ${keepTreesFile} ${keepModsFile} # regen modules.dep depmod -b "$out" "$ver" '';in { system.stateVersion = "26.05";
# actually use our slimmed down modules set system.modulesTree = lib.mkForce ([slimKernelModules] ++ config.boot.extraModulePackages);
boot.initrd.includeDefaultModules = lib.mkForce false; boot.initrd.availableKernelModules = lib.mkForce []; boot.initrd.kernelModules = lib.mkForce [ "virtio_pci" "virtio_mmio" "virtio_blk" "virtio_console" "erofs" "ext4" "overlay" ]; boot.kernelModules = ["loop"];
# some zram to help situations where burst memory usage causes OOM zramSwap = { enable = true; algorithm = "zstd"; memoryPercent = 50; };
programs.nano.enable = false; # we are on a microvm we don't need the hardware map environment.etc."udev/hwdb.bin".enable = lib.mkForce false;
networking.hostName = "spindle-microvm"; networking.useDHCP = false; systemd.network.networks."40-eth0" = { matchConfig.Name = "eth0"; address = ["10.0.3.15/24"]; gateway = ["10.0.3.2"]; dns = ["127.0.0.1"]; }; networking.nameservers = ["127.0.0.1"];
# this is disabled by microvm optimizations but we do need it system.switch.enable = lib.mkForce true;
# don't install docs or any xdg things, not necessary documentation.enable = false; xdg.mime.enable = false; xdg.icons.enable = false; xdg.sounds.enable = false;
users.groups.spindle-workflow = { gid = 970; }; users.users.spindle-workflow = { isSystemUser = true; uid = 970; group = "spindle-workflow"; home = "/workspace"; createHome = false; }; users.users.spindle-workflow.extraGroups = lib.mkIf config.virtualisation.docker.enable [ "docker" ]; virtualisation.docker.listenOptions = [ "/run/docker.sock" "/var/run/docker.sock" ];
nix = { settings = { experimental-features = [ "nix-command" "flakes" ]; trusted-users = ["root"]; allowed-users = ["spindle-workflow"]; }; registry.nixpkgs.to = { type = "path"; path = pkgs.path; }; extraOptions = '' extra-experimental-features = nix-command flakes !include /run/spindle/nix.conf ''; nixPath = ["nixpkgs=${config.nix.registry.nixpkgs.to.path}"]; };
systemd.tmpfiles.rules = [ "d /run/spindle 0755 root root -" "d /workspace 0755 spindle-workflow spindle-workflow -" "d /workspace/repo 0755 spindle-workflow spindle-workflow -" ];
# nix flake cache should go on the persisted dir, not the root (which is on tmpfs) systemd.services.shuttle = { environment.XDG_CACHE_HOME = "/var/cache/shuttle"; serviceConfig.CacheDirectory = "shuttle"; };
# add any common packages / services here environment.systemPackages = with pkgs; [ gitMinimal curlMinimal wget coreutils-full file findutils gnused jq yq xxd gnutar zip unzip gz-utils bzip2 lz4 p7zip ]; # disable default nixos packages ([perl rsync strace]) environment.defaultPackages = []; # this removed nixos-rebuild-ng and nixos-generate-config, which lets us # remove python3 closure (~107MB) system.disableInstallerTools = true;
# a single volume that will back /workspace, /var, and the nix store microvm.storeOnDisk = true; microvm.storeDiskType = "erofs"; # lz4hc, not zstd: the stock nixpkgs kernel builds erofs without # CONFIG_EROFS_FS_ZIP_ZSTD, so a zstd image fails to mount at boot ("algorithm # 3 isn't enabled on this kernel"); only lz4 is guaranteed. -Efragments and # -Ededupe are omitted because microvm.nix falls back to single-threaded # erofs-utils when either is present, which makes image builds really slow. # for now, we take the compression hit, which isn't too much anyway. # todo(dawn): the remaining big save needs a custom guest kernel (we'd want a # binary cache first so downstream users don't rebuild it every time): enable # EROFS_FS_ZIP_ZSTD for a better-compressing store-disk, build the essentials # (virtio/erofs/ext4/overlay/netfilter) in as =y, and strip the kernel image # itself. the modules tree is already pruned without a recompile, see # slimKernelModules above. microvm.storeDiskErofsFlags = [ "-zlz4hc" "-Eztailpacking" "-C131072" # bigger compression window lets lz4hc compress better (~47mb) ]; microvm.writableStoreOverlay = "/persist/rw-store"; microvm.volumes = [ { image = "persist.img"; mountPoint = "/persist"; size = 1024 * 24; # 24 GB fsType = "ext4"; } ];
# /persist must be mounted before the writable store overlay activates fileSystems."/persist".neededForBoot = true;
fileSystems."/workspace" = { device = "/persist/workspace"; fsType = "none"; options = ["bind"]; depends = ["/persist"]; }; # bind mounting /var is important since docker etc. can't use overlayfs # (overlayfs on overlayfs does not work) fileSystems."/var" = { device = "/persist/var"; fsType = "none"; options = ["bind"]; depends = ["/persist"]; }; # bind mount /tmp so our tmp is disk backed... fileSystems."/tmp" = { device = "/persist/tmp"; fsType = "none"; options = ["bind"]; depends = ["/persist"]; };
# create bind sources before local-fs.target, which means we have to do this # at initrd time boot.initrd.systemd.enable = true; boot.initrd.systemd.tmpfiles.settings."00-persist-layout" = { "/sysroot/persist/rw-store".d = { mode = "0755"; }; "/sysroot/persist/workspace".d = { mode = "0755"; user = "spindle-workflow"; group = "spindle-workflow"; }; "/sysroot/persist/var".d = { mode = "0755"; }; "/sysroot/persist/tmp".d = { mode = "1777"; }; };}