76 lines
2.5 KiB
Nix
76 lines
2.5 KiB
Nix
{
|
|
modulesPath,
|
|
pkgs,
|
|
...
|
|
}:
|
|
{
|
|
imports = [
|
|
"${modulesPath}/virtualisation/lxc-container.nix"
|
|
];
|
|
# Disable legacy channel behavior that lxc-container brings in via installer/cd-dvd/channel.nix.
|
|
system.installer.channel.enable = false;
|
|
|
|
# Impermanence setup:
|
|
# 1. There's no initrd/stage 1 in LXC container; /sbin/init is invoked after
|
|
# LXC finishes setting up special and user-configured filesystems. Any
|
|
# options in boot.initrd, as well as neededForBoot fileSystems won't be
|
|
# respected.
|
|
# 2. Non-boot fileSystems (aka systemd) mount too late for systemd or nixos
|
|
# persistence to be instantiated, so we have to create this script below.
|
|
# 3. The expectation from host is to mount /home and /nix. Root filesystem
|
|
# will also be a disk, as that's Incus requirement; the host should clean
|
|
# it up periodically using: "incus rebuild --empty <vm>".
|
|
# 4. Since rootfs will be empty after rebuild, you have to point LXC at the
|
|
# current init (instead of /sbin/init), by adding to the "config:" section
|
|
# in "incus config edit <vm>":
|
|
# raw.lxc: lxc.init.cmd = /nix/var/nix/profiles/system/init
|
|
system.activationScripts.persistence = {
|
|
deps = [ "specialfs" ];
|
|
text = ''
|
|
persist() {
|
|
local item="$1"
|
|
local constructor="''${item%%:*}"
|
|
local target="''${item#*:}"
|
|
|
|
mkdir -p "$(dirname "$target")"
|
|
$constructor "$target"
|
|
|
|
if ! mountpoint -q "$target"; then
|
|
local source="/home/persistent/$target"
|
|
|
|
mkdir -p "$(dirname "$source")"
|
|
$constructor "$source"
|
|
|
|
mount --bind "$source" "$target"
|
|
fi
|
|
}
|
|
|
|
for item in \
|
|
"mkdir -p:/var/lib/nixos" \
|
|
"mkdir -p:/var/lib/systemd" \
|
|
"touch:/etc/machine-id" \
|
|
"touch:/etc/ssh/ssh_host_ed25519_key" \
|
|
; do
|
|
persist "$item"
|
|
done
|
|
|
|
chmod 0600 /etc/ssh/ssh_host_ed25519_key
|
|
|
|
# lxc-container.nix installBootloader/installInitScript will attempt to
|
|
# symlink /sbin/init, so we have to create the parent directory.
|
|
mkdir -p /sbin
|
|
'';
|
|
};
|
|
system.activationScripts.users.deps = [ "persistence" ];
|
|
# This is supposed to persist machine-id, but fails.
|
|
systemd.services.systemd-machine-id-commit.enable = false;
|
|
|
|
# unprivileged LXCs can't set net.ipv4.ping_group_range
|
|
security.wrappers.ping = {
|
|
owner = "root";
|
|
group = "root";
|
|
capabilities = "cap_net_raw+p";
|
|
source = "${pkgs.iputils.out}/bin/ping";
|
|
};
|
|
}
|