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-rw-r--r--system-profiles/nfsroot.nix114
1 files changed, 114 insertions, 0 deletions
diff --git a/system-profiles/nfsroot.nix b/system-profiles/nfsroot.nix
new file mode 100644
index 00000000..92cf98de
--- /dev/null
+++ b/system-profiles/nfsroot.nix
@@ -0,0 +1,114 @@
1{ config, pkgs, lib, flakeInputs, ... }:
2
3with lib;
4
5let
6 cfg = config.nfsroot;
7in {
8 options = {
9 nfsroot = {
10 storeDevice = mkOption {
11 type = types.str;
12 default = "nfsroot:nix-store";
13 };
14
15 registrationUrl = mkOption {
16 type = types.str;
17 default = "http://nfsroot/nix-registration";
18 };
19 };
20
21 system.build = {
22 storeContents = mkOption {};
23 };
24 };
25
26 config = {
27 # Don't build the GRUB menu builder script, since we don't need it
28 # here and it causes a cyclic dependency.
29 boot.loader.grub.enable = false;
30
31 # !!! Hack - attributes expected by other modules.
32 environment.systemPackages = [ pkgs.grub2_efi ]
33 ++ (if pkgs.stdenv.hostPlatform.system == "aarch64-linux"
34 then []
35 else [ pkgs.grub2 pkgs.syslinux ]);
36
37 fileSystems."/" = mkImageMediaOverride
38 { fsType = "tmpfs";
39 options = [ "mode=0755" ];
40 };
41
42 # In stage 1, mount a tmpfs on top of /nix/store (the squashfs
43 # image) to make this a live CD.
44 fileSystems."/nix/.ro-store" = mkImageMediaOverride
45 { fsType = "nfs4";
46 device = cfg.storeDevice;
47 options = [ "ro" ];
48 neededForBoot = true;
49 };
50
51 fileSystems."/nix/.rw-store" = mkImageMediaOverride
52 { fsType = "tmpfs";
53 options = [ "mode=0755" ];
54 neededForBoot = true;
55 };
56
57 fileSystems."/nix/store" = mkImageMediaOverride
58 { fsType = "overlay";
59 device = "overlay";
60 options = [
61 "lowerdir=/nix/.ro-store"
62 "upperdir=/nix/.rw-store/store"
63 "workdir=/nix/.rw-store/work"
64 ];
65
66 depends = [
67 "/nix/.ro-store"
68 "/nix/.rw-store/store"
69 "/nix/.rw-store/work"
70 ];
71 };
72
73 nix.extraOptions = ''
74 use-sqlite-wal = false
75 '';
76
77 boot.initrd.availableKernelModules = [ "nfs" "nfsv4" "overlay" ];
78 boot.initrd.supportedFilesystems = [ "nfs" "nfsv4" "overlay" ];
79 services.rpcbind.enable = mkImageMediaOverride false;
80
81 boot.initrd.network.enable = true;
82 boot.initrd.network.flushBeforeStage2 = false; # otherwise nfs doesn't work
83 boot.initrd.postMountCommands = ''
84 mkdir -p /mnt-root/etc/
85 cp /etc/resolv.conf /mnt-root/etc/resolv.conf
86 '';
87 networking.useDHCP = true;
88 networking.resolvconf.enable = false;
89
90
91 system.build.storeContents = [config.system.build.toplevel];
92
93 system.build.netbootIpxeScript = pkgs.writeTextDir "netboot.ipxe" ''
94 #!ipxe
95 # Use the cmdline variable to allow the user to specify custom kernel params
96 # when chainloading this script from other iPXE scripts like netboot.xyz
97 kernel ${pkgs.stdenv.hostPlatform.linux-kernel.target} init=${config.system.build.toplevel}/init initrd=initrd ${toString config.boot.kernelParams} ''${cmdline}
98 initrd initrd
99 boot
100 '';
101
102 boot.postBootCommands =
103 ''
104 # After booting, register the contents of the Nix store on NFS
105 # in the Nix database in the tmpfs.
106 ${pkgs.curl}/bin/curl ${escapeShellArg cfg.registrationUrl} | ${config.nix.package.out}/bin/nix-store --load-db
107
108 # nixos-rebuild also requires a "system" profile and an
109 # /etc/NIXOS tag.
110 touch /etc/NIXOS
111 ${config.nix.package}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
112 '';
113 };
114}