the conversion procedure is simple: - find all things that look like options, ie calls to either `mkOption` or `lib.mkOption` that take an attrset. remember the attrset as the option - for all options, find a `description` attribute who's value is not a call to `mdDoc` or `lib.mdDoc` - textually convert the entire value of the attribute to MD with a few simple regexes (the set from mdize-module.sh) - if the change produced a change in the manual output, discard - if the change kept the manual unchanged, add some text to the description to make sure we've actually found an option. if the manual changes this time, keep the converted description this procedure converts 80% of nixos options to markdown. around 2000 options remain to be inspected, but most of those fail the "does not change the manual output check": currently the MD conversion process does not faithfully convert docbook tags like <code> and <package>, so any option using such tags will not be converted at all.
414 lines
13 KiB
Nix
414 lines
13 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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${cfg.extraConfig}
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'';
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qemuConfigFile = pkgs.writeText "qemu.conf" ''
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${optionalString cfg.qemu.ovmf.enable ''
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nvram = [ "/run/libvirt/nix-ovmf/AAVMF_CODE.fd:/run/libvirt/nix-ovmf/AAVMF_VARS.fd", "/run/libvirt/nix-ovmf/OVMF_CODE.fd:/run/libvirt/nix-ovmf/OVMF_VARS.fd" ]
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''}
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${optionalString (!cfg.qemu.runAsRoot) ''
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user = "qemu-libvirtd"
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group = "qemu-libvirtd"
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''}
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${cfg.qemu.verbatimConfig}
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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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ovmfModule = types.submodule {
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options = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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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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# mkRemovedOptionModule does not work in submodules, do it manually
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package = mkOption {
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type = types.nullOr types.package;
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default = null;
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internal = true;
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};
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packages = mkOption {
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type = types.listOf types.package;
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default = [ pkgs.OVMF.fd ];
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defaultText = literalExpression "[ pkgs.OVMF.fd ]";
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example = literalExpression "[ pkgs.OVMFFull.fd pkgs.pkgsCross.aarch64-multiplatform.OVMF.fd ]";
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description = lib.mdDoc ''
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List of OVMF packages to use. Each listed package must contain files names FV/OVMF_CODE.fd and FV/OVMF_VARS.fd or FV/AAVMF_CODE.fd and FV/AAVMF_VARS.fd
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'';
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};
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};
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};
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swtpmModule = types.submodule {
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options = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Allows libvirtd to use swtpm to create an emulated TPM.
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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.swtpm;
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defaultText = literalExpression "pkgs.swtpm";
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description = lib.mdDoc ''
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swtpm package to use.
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'';
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};
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};
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};
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qemuModule = types.submodule {
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options = {
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package = mkOption {
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type = types.package;
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default = pkgs.qemu;
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defaultText = literalExpression "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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runAsRoot = mkOption {
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type = types.bool;
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default = true;
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description = lib.mdDoc ''
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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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verbatimConfig = 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 = lib.mdDoc ''
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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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ovmf = mkOption {
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type = ovmfModule;
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default = { };
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description = lib.mdDoc ''
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QEMU's OVMF options.
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'';
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};
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swtpm = mkOption {
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type = swtpmModule;
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default = { };
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description = lib.mdDoc ''
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QEMU's swtpm options.
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'';
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};
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};
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};
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in
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{
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imports = [
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(mkRemovedOptionModule [ "virtualisation" "libvirtd" "enableKVM" ]
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"Set the option `virtualisation.libvirtd.qemu.package' instead.")
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuPackage" ]
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[ "virtualisation" "libvirtd" "qemu" "package" ])
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuRunAsRoot" ]
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[ "virtualisation" "libvirtd" "qemu" "runAsRoot" ])
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuVerbatimConfig" ]
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[ "virtualisation" "libvirtd" "qemu" "verbatimConfig" ])
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuOvmf" ]
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[ "virtualisation" "libvirtd" "qemu" "ovmf" "enable" ])
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(mkRemovedOptionModule
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[ "virtualisation" "libvirtd" "qemuOvmfPackage" ]
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"If this option was set to `foo`, set the option `virtualisation.libvirtd.qemu.ovmf.packages' to `[foo.fd]` instead.")
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(mkRenamedOptionModule
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[ "virtualisation" "libvirtd" "qemuSwtpm" ]
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[ "virtualisation" "libvirtd" "qemu" "swtpm" "enable" ])
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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 = lib.mdDoc ''
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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 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 = literalExpression "pkgs.libvirt";
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description = lib.mdDoc ''
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libvirt package to use.
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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 = lib.mdDoc ''
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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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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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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qemu = mkOption {
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type = qemuModule;
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default = { };
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description = lib.mdDoc ''
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QEMU related options.
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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.virtualisation.libvirtd.qemu.ovmf.package == null;
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message = ''
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The option virtualisation.libvirtd.qemu.ovmf.package is superseded by virtualisation.libvirtd.qemu.ovmf.packages.
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If this option was set to `foo`, set the option `virtualisation.libvirtd.qemu.ovmf.packages' to `[foo.fd]` instead.
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'';
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}
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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"
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(e:
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"allow ${e}")
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cfg.allowedBridges;
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systemPackages = with pkgs; [ libressl.nc iptables cfg.package cfg.qemu.package ];
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etc.ethertypes.source = "${pkgs.iptables}/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.qemu.package}/bin/qemu-kvm ${cfg.qemu.package}/bin/qemu-system-*; do
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ln -s --force "$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 ${cfg.qemu.package}/$helper /run/${dirName}/nix-helpers/
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done
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${optionalString cfg.qemu.ovmf.enable (let
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ovmfpackage = pkgs.buildEnv {
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name = "qemu-ovmf";
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paths = cfg.qemu.ovmf.packages;
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};
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in
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''
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ln -s --force ${ovmfpackage}/FV/AAVMF_CODE.fd /run/${dirName}/nix-ovmf/
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ln -s --force ${ovmfpackage}/FV/OVMF_CODE.fd /run/${dirName}/nix-ovmf/
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ln -s --force ${ovmfpackage}/FV/AAVMF_VARS.fd /run/${dirName}/nix-ovmf/
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ln -s --force ${ovmfpackage}/FV/OVMF_VARS.fd /run/${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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[
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"--config"
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configFile
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"--timeout"
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"120" # from ${libvirt}/var/lib/sysconfig/libvirtd
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] ++ cfg.extraOptions
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);
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path = [ cfg.qemu.package ] # libvirtd requires qemu-img to manage disk images
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++ optional vswitch.enable vswitch.package
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++ optional cfg.qemu.swtpm.enable cfg.qemu.swtpm.package;
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serviceConfig = {
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Type = "notify";
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KillMode = "process"; # when stopping, leave the VMs alone
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Restart = "no";
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};
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restartIfChanged = false;
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};
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systemd.services.virtchd = {
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path = [ pkgs.cloud-hypervisor ];
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};
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systemd.services.libvirt-guests = {
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wantedBy = [ "multi-user.target" ];
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path = with pkgs; [ coreutils gawk cfg.package ];
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restartIfChanged = false;
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environment.ON_BOOT = "${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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