140 lines
3.5 KiB
Nix
140 lines
3.5 KiB
Nix
# Upstart jobs for libvirtd.
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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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cfg = config.virtualisation.libvirtd;
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in
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{
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###### interface
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options = {
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virtualisation.libvirtd.enable =
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mkOption {
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default = false;
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description =
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''
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This option enables libvirtd, a daemon that manages
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virtual machines. You can interact with the daemon
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(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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virtualisation.libvirtd.enableKVM =
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mkOption {
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default = true;
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description =
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''
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This option enables support for QEMU/KVM in libvirtd.
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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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environment.systemPackages =
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[ pkgs.libvirt ]
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++ optional cfg.enableKVM pkgs.qemu_kvm;
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boot.kernelModules = [ "tun" ];
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jobs.libvirtd =
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{ description = "Libvirtd virtual machine management daemon";
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startOn = "stopped udevtrigger";
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stopOn = "";
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path =
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[ pkgs.bridge_utils pkgs.dmidecode pkgs.dnsmasq
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pkgs.ebtables
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] ++ optional cfg.enableKVM pkgs.qemu_kvm;
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preStart =
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''
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mkdir -p /var/log/libvirt/qemu -m 755
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rm -f /var/run/libvirtd.pid
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mkdir -p /var/lib/libvirt -m 700
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mkdir -p /var/lib/libvirt/dnsmasq -m 700
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# Libvirt unfortunately writes mutable state (such as
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# runtime changes to VM, network or filter configurations)
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# to /etc. So we can't use environment.etc to make the
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# default network and filter definitions available, since
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# libvirt will then modify the originals in the Nix store.
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# So here we copy them instead. Ugly.
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for i in $(cd ${pkgs.libvirt}/etc && echo \
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libvirt/qemu/networks/*.xml libvirt/qemu/networks/autostart/*.xml \
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libvirt/nwfilter/*.xml );
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do
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mkdir -p /etc/$(dirname $i) -m 755
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cp -fpd ${pkgs.libvirt}/etc/$i /etc/$i
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done
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''; # */
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exec = "${pkgs.libvirt}/sbin/libvirtd --daemon --verbose";
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# Wait until libvirtd is ready to accept requests.
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postStart =
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''
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for ((i = 0; i < 60; i++)); do
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if ${pkgs.libvirt}/bin/virsh list > /dev/null; then exit 0; fi
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sleep 1
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done
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exit 1 # !!! seems to be ignored
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'';
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daemonType = "daemon";
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};
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# !!! Split this into save and restore tasks.
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jobs."libvirt-guests" =
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{ description = "Job to save/restore libvirtd VMs";
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startOn = "started libvirtd";
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# We want to suspend VMs only on shutdown, but Upstart is broken.
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stopOn = "";
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restartIfChanged = false;
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path = [ pkgs.gettext pkgs.libvirt pkgs.gawk ];
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preStart =
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''
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mkdir -p /var/lock/subsys -m 755
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${pkgs.libvirt}/etc/rc.d/init.d/libvirt-guests start || true
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'';
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postStop = "${pkgs.libvirt}/etc/rc.d/init.d/libvirt-guests stop";
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respawn = false;
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};
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jobs."stop-libvirt" =
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{ description = "Helper task to stop libvirtd and libvirt-guests on shutdown";
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task = true;
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restartIfChanged = false;
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startOn = "starting shutdown";
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script =
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''
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stop libvirt-guests || true
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stop libvirtd || true
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'';
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};
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};
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}
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