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100 lines
2.9 KiB
Nix
100 lines
2.9 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.virtualisation.lxd.agent;
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# the lxd agent is provided by the lxd daemon through a virtiofs or 9p mount
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# this is a port of the distrobuilder lxd-agent generator
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# https://github.com/lxc/distrobuilder/blob/f77300bf7d7d5707b08eaf8a434d647d1ba81b5d/generators/lxd-agent.go#L18-L55
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preStartScript = ''
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PREFIX="/run/lxd_agent"
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mount_virtiofs() {
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mount -t virtiofs config "$PREFIX/.mnt" >/dev/null 2>&1
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}
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mount_9p() {
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modprobe 9pnet_virtio >/dev/null 2>&1 || true
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mount -t 9p config "$PREFIX/.mnt" -o access=0,trans=virtio,size=1048576 >/dev/null 2>&1
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}
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fail() {
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umount -l "$PREFIX" >/dev/null 2>&1 || true
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rmdir "$PREFIX" >/dev/null 2>&1 || true
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echo "$1"
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exit 1
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}
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# Setup the mount target.
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umount -l "$PREFIX" >/dev/null 2>&1 || true
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mkdir -p "$PREFIX"
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mount -t tmpfs tmpfs "$PREFIX" -o mode=0700,size=50M
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mkdir -p "$PREFIX/.mnt"
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# Try virtiofs first.
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mount_virtiofs || mount_9p || fail "Couldn't mount virtiofs or 9p, failing."
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# Copy the data.
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cp -Ra "$PREFIX/.mnt/"* "$PREFIX"
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# Unmount the temporary mount.
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umount "$PREFIX/.mnt"
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rmdir "$PREFIX/.mnt"
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# Fix up permissions.
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chown -R root:root "$PREFIX"
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'';
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in {
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options = {
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virtualisation.lxd.agent.enable = lib.mkEnableOption "LXD agent";
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};
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config = lib.mkIf cfg.enable {
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# https://github.com/lxc/distrobuilder/blob/f77300bf7d7d5707b08eaf8a434d647d1ba81b5d/generators/lxd-agent.go#L108-L125
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systemd.services.lxd-agent = {
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enable = true;
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wantedBy = [ "multi-user.target" ];
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before = [ "shutdown.target" ] ++ lib.optionals config.services.cloud-init.enable [
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"cloud-init.target" "cloud-init.service" "cloud-init-local.service"
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];
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conflicts = [ "shutdown.target" ];
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path = [
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pkgs.kmod
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pkgs.util-linux
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# allow `incus exec` to find system binaries
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"/run/current-system/sw"
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];
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preStart = preStartScript;
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# avoid killing nixos-rebuild switch when executed through lxc exec
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restartIfChanged = false;
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stopIfChanged = false;
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unitConfig = {
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Description = "LXD - agent";
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Documentation = "https://documentation.ubuntu.com/lxd/en/latest";
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ConditionPathExists = "/dev/virtio-ports/org.linuxcontainers.lxd";
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DefaultDependencies = "no";
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StartLimitInterval = "60";
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StartLimitBurst = "10";
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};
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serviceConfig = {
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Type = "notify";
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WorkingDirectory = "-/run/lxd_agent";
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ExecStart = "/run/lxd_agent/lxd-agent";
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Restart = "on-failure";
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RestartSec = "5s";
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};
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};
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systemd.paths.lxd-agent = {
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enable = true;
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wantedBy = [ "multi-user.target" ];
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pathConfig.PathExists = "/dev/virtio-ports/org.linuxcontainers.lxd";
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};
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};
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}
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