forked from mirrors/nixpkgs
fedd7cd690
This is slightly more verbose and inconvenient, but it forces you to think about what the wrapper ownership and permissions will be.
301 lines
9.4 KiB
Nix
301 lines
9.4 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.virtualisation.libvirtd;
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vswitch = config.virtualisation.vswitch;
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configFile = pkgs.writeText "libvirtd.conf" ''
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auth_unix_ro = "polkit"
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auth_unix_rw = "polkit"
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${cfg.extraConfig}
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'';
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ovmfFilePrefix = if pkgs.stdenv.isAarch64 then "AAVMF" else "OVMF";
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qemuConfigFile = pkgs.writeText "qemu.conf" ''
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${optionalString cfg.qemuOvmf ''
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nvram = [ "/run/libvirt/nix-ovmf/${ovmfFilePrefix}_CODE.fd:/run/libvirt/nix-ovmf/${ovmfFilePrefix}_VARS.fd" ]
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''}
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${optionalString (!cfg.qemuRunAsRoot) ''
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user = "qemu-libvirtd"
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group = "qemu-libvirtd"
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''}
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${cfg.qemuVerbatimConfig}
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'';
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dirName = "libvirt";
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subDirs = list: [ dirName ] ++ map (e: "${dirName}/${e}") list;
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in {
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imports = [
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(mkRemovedOptionModule [ "virtualisation" "libvirtd" "enableKVM" ]
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"Set the option `virtualisation.libvirtd.qemuPackage' instead.")
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];
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###### interface
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options.virtualisation.libvirtd = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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This option enables libvirtd, a daemon that manages
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virtual machines. Users in the "libvirtd" group can interact with
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the daemon (e.g. to start or stop VMs) using the
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<command>virsh</command> command line tool, among others.
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'';
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};
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package = mkOption {
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type = types.package;
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default = pkgs.libvirt;
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defaultText = "pkgs.libvirt";
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description = ''
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libvirt package to use.
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'';
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};
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qemuPackage = mkOption {
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type = types.package;
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default = pkgs.qemu;
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description = ''
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Qemu package to use with libvirt.
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`pkgs.qemu` can emulate alien architectures (e.g. aarch64 on x86)
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`pkgs.qemu_kvm` saves disk space allowing to emulate only host architectures.
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'';
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};
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extraConfig = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Extra contents appended to the libvirtd configuration file,
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libvirtd.conf.
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'';
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};
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qemuRunAsRoot = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If true, libvirtd runs qemu as root.
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If false, libvirtd runs qemu as unprivileged user qemu-libvirtd.
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Changing this option to false may cause file permission issues
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for existing guests. To fix these, manually change ownership
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of affected files in /var/lib/libvirt/qemu to qemu-libvirtd.
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'';
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};
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qemuVerbatimConfig = mkOption {
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type = types.lines;
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default = ''
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namespaces = []
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'';
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description = ''
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Contents written to the qemu configuration file, qemu.conf.
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Make sure to include a proper namespace configuration when
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supplying custom configuration.
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'';
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};
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qemuOvmf = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Allows libvirtd to take advantage of OVMF when creating new
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QEMU VMs with UEFI boot.
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'';
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};
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extraOptions = mkOption {
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type = types.listOf types.str;
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default = [ ];
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example = [ "--verbose" ];
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description = ''
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Extra command line arguments passed to libvirtd on startup.
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'';
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};
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onBoot = mkOption {
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type = types.enum ["start" "ignore" ];
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default = "start";
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description = ''
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Specifies the action to be done to / on the guests when the host boots.
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The "start" option starts all guests that were running prior to shutdown
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regardless of their autostart settings. The "ignore" option will not
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start the formerly running guest on boot. However, any guest marked as
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autostart will still be automatically started by libvirtd.
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'';
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};
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onShutdown = mkOption {
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type = types.enum ["shutdown" "suspend" ];
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default = "suspend";
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description = ''
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When shutting down / restarting the host what method should
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be used to gracefully halt the guests. Setting to "shutdown"
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will cause an ACPI shutdown of each guest. "suspend" will
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attempt to save the state of the guests ready to restore on boot.
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'';
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};
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allowedBridges = mkOption {
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type = types.listOf types.str;
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default = [ "virbr0" ];
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description = ''
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List of bridge devices that can be used by qemu:///session
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'';
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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assertions = [
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{
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assertion = config.security.polkit.enable;
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message = "The libvirtd module currently requires Polkit to be enabled ('security.polkit.enable = true').";
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}
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];
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environment = {
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# this file is expected in /etc/qemu and not sysconfdir (/var/lib)
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etc."qemu/bridge.conf".text = lib.concatMapStringsSep "\n" (e:
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"allow ${e}") cfg.allowedBridges;
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systemPackages = with pkgs; [ libressl.nc iptables cfg.package cfg.qemuPackage ];
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etc.ethertypes.source = "${pkgs.ebtables}/etc/ethertypes";
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};
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boot.kernelModules = [ "tun" ];
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users.groups.libvirtd.gid = config.ids.gids.libvirtd;
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# libvirtd runs qemu as this user and group by default
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users.extraGroups.qemu-libvirtd.gid = config.ids.gids.qemu-libvirtd;
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users.extraUsers.qemu-libvirtd = {
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uid = config.ids.uids.qemu-libvirtd;
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isNormalUser = false;
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group = "qemu-libvirtd";
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};
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security.wrappers.qemu-bridge-helper = {
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setuid = true;
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owner = "root";
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group = "root";
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source = "/run/${dirName}/nix-helpers/qemu-bridge-helper";
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};
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systemd.packages = [ cfg.package ];
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systemd.services.libvirtd-config = {
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description = "Libvirt Virtual Machine Management Daemon - configuration";
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script = ''
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# Copy default libvirt network config .xml files to /var/lib
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# Files modified by the user will not be overwritten
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for i in $(cd ${cfg.package}/var/lib && echo \
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libvirt/qemu/networks/*.xml libvirt/qemu/networks/autostart/*.xml \
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libvirt/nwfilter/*.xml );
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do
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mkdir -p /var/lib/$(dirname $i) -m 755
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cp -npd ${cfg.package}/var/lib/$i /var/lib/$i
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done
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# Copy generated qemu config to libvirt directory
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cp -f ${qemuConfigFile} /var/lib/${dirName}/qemu.conf
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# stable (not GC'able as in /nix/store) paths for using in <emulator> section of xml configs
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for emulator in ${cfg.package}/libexec/libvirt_lxc ${cfg.qemuPackage}/bin/qemu-kvm ${cfg.qemuPackage}/bin/qemu-system-*; do
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ln -s --force "$emulator" /run/${dirName}/nix-emulators/
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done
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for helper in libexec/qemu-bridge-helper bin/qemu-pr-helper; do
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ln -s --force ${cfg.qemuPackage}/$helper /run/${dirName}/nix-helpers/
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done
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${optionalString cfg.qemuOvmf ''
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ln -s --force ${pkgs.OVMF.fd}/FV/${ovmfFilePrefix}_CODE.fd /run/${dirName}/nix-ovmf/
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ln -s --force ${pkgs.OVMF.fd}/FV/${ovmfFilePrefix}_VARS.fd /run/${dirName}/nix-ovmf/
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''}
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'';
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serviceConfig = {
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Type = "oneshot";
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RuntimeDirectoryPreserve = "yes";
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LogsDirectory = subDirs [ "qemu" ];
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RuntimeDirectory = subDirs [ "nix-emulators" "nix-helpers" "nix-ovmf" ];
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StateDirectory = subDirs [ "dnsmasq" ];
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};
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};
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systemd.services.libvirtd = {
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requires = [ "libvirtd-config.service" ];
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after = [ "libvirtd-config.service" ]
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++ optional vswitch.enable "ovs-vswitchd.service";
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environment.LIBVIRTD_ARGS = escapeShellArgs (
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[ "--config" configFile
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"--timeout" "120" # from ${libvirt}/var/lib/sysconfig/libvirtd
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] ++ cfg.extraOptions);
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path = [ cfg.qemuPackage ] # libvirtd requires qemu-img to manage disk images
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++ optional vswitch.enable vswitch.package;
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serviceConfig = {
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Type = "notify";
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KillMode = "process"; # when stopping, leave the VMs alone
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Restart = "no";
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};
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restartIfChanged = false;
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};
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systemd.services.libvirt-guests = {
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wantedBy = [ "multi-user.target" ];
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path = with pkgs; [ coreutils gawk cfg.package ];
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restartIfChanged = false;
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environment.ON_BOOT = "${cfg.onBoot}";
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environment.ON_SHUTDOWN = "${cfg.onShutdown}";
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};
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systemd.sockets.virtlogd = {
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description = "Virtual machine log manager socket";
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wantedBy = [ "sockets.target" ];
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listenStreams = [ "/run/${dirName}/virtlogd-sock" ];
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};
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systemd.services.virtlogd = {
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description = "Virtual machine log manager";
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serviceConfig.ExecStart = "@${cfg.package}/sbin/virtlogd virtlogd";
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restartIfChanged = false;
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};
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systemd.sockets.virtlockd = {
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description = "Virtual machine lock manager socket";
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wantedBy = [ "sockets.target" ];
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listenStreams = [ "/run/${dirName}/virtlockd-sock" ];
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};
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systemd.services.virtlockd = {
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description = "Virtual machine lock manager";
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serviceConfig.ExecStart = "@${cfg.package}/sbin/virtlockd virtlockd";
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restartIfChanged = false;
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};
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# https://libvirt.org/daemons.html#monolithic-systemd-integration
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systemd.sockets.libvirtd.wantedBy = [ "sockets.target" ];
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security.polkit.extraConfig = ''
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polkit.addRule(function(action, subject) {
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if (action.id == "org.libvirt.unix.manage" &&
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subject.isInGroup("libvirtd")) {
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return polkit.Result.YES;
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}
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});
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'';
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};
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}
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