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|
{
config,
flakes,
lib,
pkgs,
...
}:
with lib; let
cfg = config.local.web.sites.pxe;
pxeEnabled = machine: machine.config.local.boot.pxe.enable;
machines = listToAttrs (map (name: {
inherit name;
value = flakes.self.nixosConfigurations.${name};
})
cfg.machines);
stage2For = name: machine:
# https://purpleidea.com/blog/2025/01/23/working-around-an-ipxe-issue/
# "The answer:
# They told me that one of their engineers had struggled with the same issue for a while. The solution:
# Add the imgfree iPXE command before you boot!
# I wish the docs would hint that this is often required, but now I know, and now you know too!
# You can see that line here."
pkgs.writeText "stage2-${name}.ipxe" ''
#!ipxe
echo stage2: booting ${name}...
imgfree
kernel kernel init=${machine.config.system.build.toplevel}/init ${concatStringsSep " " machine.config.boot.kernelParams} || goto fail
initrd initrd || goto fail
boot ||
:fail
echo stage2: failed, rebooting in 5 seconds...
sleep 5
reboot --warm
'';
machineLocations = name: machine: let
mac = machine.config.local.boot.pxe.mac;
build = machine.config.system.build;
in {
"= /${mac}/initrd".alias = "${build.initialRamdisk}/initrd";
"= /${mac}/kernel".alias = "${build.kernel}/${pkgs.stdenv.hostPlatform.linux-kernel.target}";
"= /${mac}/stage2.ipxe".alias = "${stage2For name machine}";
};
in {
options.local.web.sites.pxe = {
enable = mkEnableOption "PXE netboot image server";
linkLocal6 = mkOption {
type = types.str;
};
network = mkOption {
type = types.str;
};
machines = mkOption {
type = types.listOf types.str;
default = [];
};
};
config = mkIf cfg.enable {
assertions =
mapAttrsToList (name: machine: {
message = "PXE boot is not enabled in config '${name}'";
assertion = pxeEnabled machine;
})
machines;
local.web.enable = mkDefault true;
networking = {
firewall.extraCommands = ''
ip6tables -t filter -A local-input -p udp -i ${cfg.network} --dport 1792 -d ${cfg.linkLocal6} -j ACCEPT
'';
};
services = {
nginx = {
virtualHosts = {
"[${cfg.linkLocal6}]" = {
listenAddresses = ["[${cfg.linkLocal6}]"];
addSSL = false;
forceSSL = false;
locations = mergeAttrsList (mapAttrsToList machineLocations (filterAttrs (_: pxeEnabled) machines));
};
};
};
};
systemd = {
network = {
networks.${cfg.network}.addresses = [
{
Address = "${cfg.linkLocal6}/128";
AddPrefixRoute = "no";
PreferredLifetime = "0";
}
];
};
services = {
pxe-store-upload = {
path = [config.nix.package pkgs.sshfs pkgs.squashfsTools];
script = let
host = "a320m";
machine = machines.${host};
in ''
set -e
pxe_ip='${machine.config.local.boot.pxe.linkLocal6}'
pxe_host='${host}'
pxe_system='${machine.config.system.build.toplevel}'
mountpoint="./pxe-initrd.$pxe_host"
store_img="$mountpoint/nix-store.squashfs"
mkdir -p "$mountpoint"
export PATH="/run/wrappers/bin:$PATH"
sshfs \
"root@[$pxe_ip%${cfg.network}]:/nix/.ro-store-img/" \
"$mountpoint" \
-o idmap=user
nix-store --query --requisites "$pxe_system" | \
xargs -I{} mksquashfs {} - \
-stream -comp zstd -one-file-system -no-xattrs \
>"$store_img.tmp"
mksquashfs -fix "$store_img.tmp"
sync "$store_img.tmp"
mv -- "$store_img.tmp" "$store_img"
fusermount3 -u "$mountpoint"
'';
serviceConfig = {
#AmbientCapabilities = ["CAP_SYS_ADMIN"];
#CapabilityBoundingSet = ["CAP_SYS_ADMIN"];
#BindPaths = ["/dev/fuse"];
#BindReadOnlyPaths = ["/nix/store"];
#DeviceAllow = ["/dev/fuse rwm"];
#DevicePolicy = "closed";
#MountAPIVFS = true;
ProtectSystem = "strict";
ProtectControlGroups = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
#PrivateDevices = true;
#PrivateTmp = true;
#PrivateUsers = true;
#TemporaryFileSystem = ["/"];
#DynamicUser = true;
RuntimeDirectory = "pxe-store-upload";
WorkingDirectory = "/run/pxe-store-upload";
};
};
};
sockets = {
pxe-store-upload = {
after = ["network-online.target"];
wants = ["network-online.target"];
wantedBy = ["sockets.target"];
socketConfig = {
ListenDatagram = "[${cfg.linkLocal6}]:1792%%${cfg.network}";
};
};
};
};
};
}
|
