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|
{
config,
lib,
...
}:
with lib; let
cfg = config.local.boot.pxe;
in {
options.local.boot.pxe = {
enable = mkEnableOption "PXE netboot";
setupMode = mkOption {
type = types.bool;
default = false;
};
initrdInterface = mkOption {
type = types.str;
};
linkLocal6 = mkOption {
type = types.str;
};
networkDriver = mkOption {
type = types.str;
};
mac = mkOption {
type = types.str;
};
panicTimeout = mkOption {
type = types.nullOr types.ints.u16;
default = 30;
};
};
# Based on nixpkgs/nixos/modules/installer/netboot/netboot.nix
config = mkIf cfg.enable {
boot = {
initrd = {
kernelModules = [cfg.networkDriver];
network = {
enable = true;
flushBeforeStage2 = true;
ssh = {
enable = true;
ignoreEmptyHostKeys = true;
};
};
preFailCommands = mkIf (!cfg.setupMode) ''
echo "init stage1 failed in unattended mode, rebooting"
reboot -f
'';
postResumeCommands = ''
store_img_dir="/nix/.ro-store-img"
store_img="$store_img_dir/nix-store.squashfs"
mkdir -p "$store_img_dir"
mount -t tmpfs -o mode=0700,nr_inodes=2,huge=within_size,nodev,nosuid tmpfs "$store_img_dir"
ip link set up ${cfg.initrdInterface}
ip addr add ${cfg.linkLocal6}/64 dev ${cfg.initrdInterface}
recv_init_timeout=120
echo -n "Waiting up to ''${recv_init_timeout}s for $store_img"
t="$recv_init_timeout"
while true; do
echo -n . | nc -u -w1 -s ${cfg.linkLocal6}%${cfg.initrdInterface} fe80::b007:b007%${cfg.initrdInterface} 1792 >/dev/null 2>&1 &
if [ -e "$store_img.tmp" ]; then
kill -x nc
break
elif [ "$t" -le 0 ]; then
echo "timed out"
fail
fi
# sleep builtin de ash retorna cuando nc termina (lo cual puede pasar muchas veces debido a IPv6 DAD)
/bin/sleep 1
echo -n .
t=$((t - 1))
done
recv_poll=60
recv_timeout=1800
t=0
last_mtime=""
poll_time="$recv_poll"
while true; do
if [ -e "$store_img" ]; then
break
elif [ "$t" -ge "$recv_timeout" ]; then
echo "Store image upload timed out"
fail
fi
sleep 1
t=$((t + 1))
poll_time=$((poll_time - 1))
if [ "$poll_time" -le 0 ]; then
current_size=$(stat -c '%s' "$store_img.tmp" || echo -)
current_mtime=$(stat -c '%y' "$store_img.tmp" || echo final)
echo "Store upload: $current_mtime: $current_size bytes"
if [ "$current_mtime" = "$last_mtime" ]; then
echo "Store image upload stalled, image not modified in ''${recv_poll}s"
fail
fi
last_mtime="$current_mtime"
poll_time="$recv_poll"
fi
done
sleep 1
kill -x sshd
chmod 0500 "$store_img_dir"
chmod 0400 "$store_img"
chattr +i "$store_img"
mount -o remount,ro "$store_img_dir"
store_size=$(stat -c '%s' "$store_img")
echo "Store image upload complete, final size is $store_size bytes"
ln -sf "$store_img" /dev/nix-store
'';
postMountCommands = ''
mkdir -p "/mnt-root$store_img_dir"
mount --move "$store_img_dir" "/mnt-root$store_img_dir"
'';
};
kernelParams =
optional (cfg.panicTimeout != null) "panic=${toString cfg.panicTimeout}"
++ optional cfg.setupMode "boot.shell_on_fail";
};
fileSystems = {
"/" = {
fsType = "tmpfs";
neededForBoot = true;
options = ["mode=0755"];
};
"/nix/store" = {
fsType = "overlay";
neededForBoot = true;
overlay = {
lowerdir = ["/nix/.ro-store"];
upperdir = "/nix/.rw-store/store";
workdir = "/nix/.rw-store/work";
};
};
"/nix/.ro-store" = {
fsType = "squashfs";
neededForBoot = true;
device = "/dev/nix-store";
options = ["loop" "threads=multi"];
};
"/nix/.rw-store" = {
fsType = "tmpfs";
neededForBoot = true;
options = ["mode=0755"];
};
};
local = {
boot.loader = "out-of-band";
};
};
}
|
