124 lines
4.1 KiB
Nix
124 lines
4.1 KiB
Nix
{ config, lib, modulesPath, pkgs, ... }:
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let
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restore-network = pkgs.writers.writePython3 "restore-network" {
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flakeIgnore = ["E501"];
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} ./restore_routes.py;
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# does not link with iptables enabled
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iprouteStatic = pkgs.pkgsStatic.iproute2.override { iptables = null; };
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in {
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imports = [
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(modulesPath + "/installer/netboot/netboot-minimal.nix")
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];
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options = {
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system.kexec-installer.name = lib.mkOption {
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type = lib.types.str;
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default = "nixos-kexec-installer";
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description = ''
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The variant of the kexec installer to use.
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'';
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};
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};
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config = {
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# We are stateless, so just default to latest.
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system.stateVersion = config.system.nixos.version;
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# This is a variant of the upstream kexecScript that also allows embedding
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# a ssh key.
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system.build.kexecRun = pkgs.runCommand "kexec-run" {} ''
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install -D -m 0755 ${./kexec-run.sh} $out
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sed -i \
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-e 's|@init@|${config.system.build.toplevel}/init|' \
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-e 's|@kernelParams@|${lib.escapeShellArgs config.boot.kernelParams}|' \
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$out
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${pkgs.shellcheck}/bin/shellcheck $out
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'';
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system.build.kexecTarball = pkgs.runCommand "kexec-tarball" {} ''
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mkdir kexec $out
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cp "${config.system.build.netbootRamdisk}/initrd" kexec/initrd
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cp "${config.system.build.kernel}/${config.system.boot.loader.kernelFile}" kexec/bzImage
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cp "${config.system.build.kexecRun}" kexec/run
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cp "${pkgs.pkgsStatic.kexec-tools}/bin/kexec" kexec/kexec
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cp "${iprouteStatic}/bin/ip" kexec/ip
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tar -czvf $out/${config.system.kexec-installer.name}-${pkgs.stdenv.hostPlatform.system}.tar.gz kexec
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'';
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# IPMI SOL console redirection stuff
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boot.kernelParams =
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[ "console=tty0" ] ++
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(lib.optional (pkgs.stdenv.hostPlatform.isAarch32 || pkgs.stdenv.hostPlatform.isAarch64) "console=ttyAMA0,115200") ++
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(lib.optional (pkgs.stdenv.hostPlatform.isRiscV) "console=ttySIF0,115200") ++
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[ "console=ttyS0,115200" ];
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documentation.enable = false;
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# Not really needed. Saves a few bytes and the only service we are running is sshd, which we want to be reachable.
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networking.firewall.enable = false;
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systemd.network.enable = true;
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networking.dhcpcd.enable = false;
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# for detection if we are on kexec
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environment.etc.is_kexec.text = "true";
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# for zapping of disko
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environment.systemPackages = [
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pkgs.jq
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];
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systemd.services.restore-network = {
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before = [ "network-pre.target" ];
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wants = [ "network-pre.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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ExecStart = [
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"${restore-network} /root/network/addrs.json /root/network/routes-v4.json /root/network/routes-v6.json /etc/systemd/network"
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];
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};
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unitConfig.ConditionPathExists = [
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"/root/network/addrs.json"
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"/root/network/routes-v4.json"
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"/root/network/routes-v6.json"
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];
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};
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systemd.services.log-network-status = {
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wantedBy = [ "multi-user.target" ];
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# No point in restarting this. We just need this after boot
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restartIfChanged = false;
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serviceConfig = {
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Type = "oneshot";
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StandardOutput = "journal+console";
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ExecStart = [
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# Allow failures, so it still prints what interfaces we have even if we
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# not get online
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"-${pkgs.systemd}/lib/systemd/systemd-networkd-wait-online"
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"${pkgs.iproute2}/bin/ip -c addr"
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"${pkgs.iproute2}/bin/ip -c -6 route"
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"${pkgs.iproute2}/bin/ip -c -4 route"
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];
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};
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};
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# Restore ssh host and user keys if they are available.
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# This avoids warnings of unknown ssh keys.
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boot.initrd.postMountCommands = ''
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mkdir -m 700 -p /mnt-root/root/.ssh
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mkdir -m 755 -p /mnt-root/etc/ssh
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mkdir -m 755 -p /mnt-root/root/network
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if [[ -f ssh/authorized_keys ]]; then
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install -m 400 ssh/authorized_keys /mnt-root/root/.ssh
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fi
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install -m 400 ssh/ssh_host_* /mnt-root/etc/ssh
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cp *.json /mnt-root/root/network/
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'';
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};
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}
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