+++ /dev/null
-# inspired from https://nixos.wiki/wiki/Virtualization_in_NixOS
-{ config, pkgs, lib, ... }@args:
-let
- pools = {
- niximages = {
- type = "dir";
- target = "/etc/libvirtd/base-images";
- };
- buildbot-disks = rec {
- preStart = ''
- mkdir -p ${target}
- '';
- type = "dir";
- target = "/var/lib/libvirt/images/buildbot-disks";
- };
- zfspool = {
- # pool-define-as --name zfspool --source-name zpool/libvirt --type zfs
- type = "zfs";
- xml = ''
- <source>
- <name>zpool/libvirt</name>
- </source>
- '';
- };
- };
- networks = {
- immae = {
- bridgeNumber = "1";
- ipRange = "192.168.100";
- };
- };
- guests = {
- caldance = {
- pool = "zfspool";
- cpus = "1";
- memory = "2";
- network = "immae";
- diskSize = "10GiB";
- extraDevicesXML = ''
- <filesystem type="mount">
- <source dir="/var/lib/caldance"/>
- <target dir="home"/>
- </filesystem>
- '';
- };
- buildbot = {
- pool = "zfspool";
- cpus = "1";
- memory = "3";
- network = "immae";
- diskSize = "10GiB";
- destroyVolumeOnExit = true;
- };
- };
- toImage = f: "${import ./vms/base_image.nix f (args // { myEnv = config.myEnv; })}/nixos.qcow2";
-in
-{
- environment.etc."libvirtd/base-images/nixos.qcow2".source = toImage ./vms/base_configuration.nix;
- environment.etc."libvirtd/base-images/buildbot.qcow2".source = toImage ./vms/buildbot_configuration.nix;
- systemd.services = lib.mapAttrs' (name: guest: lib.nameValuePair "libvirtd-guest-${name}" {
- after = [ "libvirtd.service" "libvirtd-pool-${guest.pool}.service" "libvirtd-network-${guest.network}.service" ];
- requires = [ "libvirtd.service" "libvirtd-pool-${guest.pool}.service" "libvirtd-network-${guest.network}.service" ];
- wantedBy = [ "multi-user.target" ];
- serviceConfig = {
- Type = "oneshot";
- RemainAfterExit = "yes";
- };
- script =
- let
- xml = pkgs.writeText "libvirt-guest-${name}.xml"
- ''
- <domain type="kvm">
- <name>${name}</name>
- <uuid>UUID</uuid>
- <memory unit="GiB">${guest.memory}</memory>
- <vcpu>${guest.cpus}</vcpu>
- <os>
- <type arch="x86_64">hvm</type>
- </os>
- <devices>
- <emulator>/run/current-system/sw/bin/qemu-system-x86_64</emulator>
- <disk type="volume">
- <source pool="${guest.pool}" volume="guest-${name}" />
- <target dev="vda" bus="virtio"/>
- </disk>
- ${guest.extraDevicesXML or ""}
- <input type="keyboard" bus="usb"/>
- <graphics type="vnc" port="-1" autoport="yes"/>
- <interface type="network">
- <source network="${guest.network}" />
- </interface>
- </devices>
- <features>
- <acpi/>
- </features>
- </domain>
- '';
- in
- guest.preStart or "" + ''
- if ! ${pkgs.libvirt}/bin/virsh vol-key 'guest-${name}' --pool ${guest.pool} &> /dev/null; then
- ${pkgs.libvirt}/bin/virsh vol-create-as --pool ${guest.pool} --name 'guest-${name}' --capacity '${guest.diskSize}'
- volume_path=$(${pkgs.libvirt}/bin/virsh vol-path --pool ${guest.pool} --vol 'guest-${name}')
- ${pkgs.qemu}/bin/qemu-img convert /etc/libvirtd/base-images/nixos.qcow2 $volume_path
- fi
- uuid="$(${pkgs.libvirt}/bin/virsh domuuid '${name}' || true)"
- ${pkgs.libvirt}/bin/virsh define <(sed "s/UUID/$uuid/" '${xml}')
- ${pkgs.libvirt}/bin/virsh start '${name}'
- '';
- preStop = ''
- ${pkgs.libvirt}/bin/virsh shutdown '${name}'
- let "timeout = $(date +%s) + 10"
- while [ "$(${pkgs.libvirt}/bin/virsh list --name | grep --count '^${name}$')" -gt 0 ]; do
- if [ "$(date +%s)" -ge "$timeout" ]; then
- # Meh, we warned it...
- ${pkgs.libvirt}/bin/virsh destroy '${name}'
- else
- # The machine is still running, let's give it some time to shut down
- sleep 0.5
- fi
- done
- '' + lib.optionalString (guest.destroyVolumeOnExit or false) ''
- if ${pkgs.libvirt}/bin/virsh vol-key 'guest-${name}' --pool ${guest.pool} &> /dev/null; then
- ${pkgs.libvirt}/bin/virsh vol-wipe --pool ${guest.pool} --vol 'guest-${name}' || true
- ${pkgs.libvirt}/bin/virsh vol-delete --pool ${guest.pool} --vol 'guest-${name}'
- fi
- '';
- }) guests // (lib.mapAttrs' (name: network: lib.nameValuePair "libvirtd-network-${name}" {
- after = [ "libvirtd.service" ];
- requires = [ "libvirtd.service" ];
- wantedBy = [ "multi-user.target" ];
- serviceConfig = {
- Type = "oneshot";
- RemainAfterExit = "yes";
- };
- script = let
- xml = pkgs.writeText "libvirt-network-${name}.xml" ''
- <network>
- <name>${name}</name>
- <uuid>UUID</uuid>
- <forward mode='nat' />
- <bridge name='virbr${network.bridgeNumber}' />
- <domain name='${name}' localOnly='yes'/>
- <ip address='${network.ipRange}.1' netmask='255.255.255.0'>
- <dhcp>
- <range start='${network.ipRange}.2' end='${network.ipRange}.254'/>
- </dhcp>
- </ip>
- </network>
- '';
- in ''
- uuid="$(${pkgs.libvirt}/bin/virsh net-uuid '${name}' || true)"
- ${pkgs.libvirt}/bin/virsh net-define <(sed "s/UUID/$uuid/" '${xml}')
- ${pkgs.libvirt}/bin/virsh net-start '${name}'
- '';
- preStop = ''
- ${pkgs.libvirt}/bin/virsh net-destroy '${name}'
- '';
- }) networks) // (lib.mapAttrs' (name: pool: lib.nameValuePair "libvirtd-pool-${name}" {
- after = [ "libvirtd.service" ];
- requires = [ "libvirtd.service" ];
- wantedBy = [ "multi-user.target" ];
- serviceConfig = {
- Type = "oneshot";
- RemainAfterExit = "yes";
- };
- script = let
- xml = pkgs.writeText "libvirt-pool-${name}.xml" ''
- <pool type="${pool.type}">
- <name>${name}</name>
- <uuid>UUID</uuid>
- ${pool.xml or ""}
- ${if pool ? target then ''
- <target>
- <path>${pool.target}</path>
- </target>
- '' else ""}
- </pool>
- '';
- in pool.preStart or "" + ''
- uuid="$(${pkgs.libvirt}/bin/virsh pool-uuid '${name}' || true)"
- ${pkgs.libvirt}/bin/virsh pool-define <(sed "s/UUID/$uuid/" '${xml}')
- ${pkgs.libvirt}/bin/virsh pool-start '${name}' || true
- '';
- }) pools);
-}