]>
Commit | Line | Data |
---|---|---|
200690c9 IB |
1 | # inspired from https://nixos.wiki/wiki/Virtualization_in_NixOS |
2 | { config, pkgs, lib, ... }@args: | |
3 | let | |
4 | networks = { | |
5 | immae = { | |
6 | bridgeNumber = "1"; | |
7 | ipRange = "192.168.100"; | |
8 | }; | |
9 | }; | |
10 | guests = { | |
11 | caldance = { | |
12 | pool = "zfspool"; | |
13 | cpus = "1"; | |
14 | memory = "2"; | |
15 | network = "immae"; | |
16 | diskSize = "10GiB"; | |
17 | extraDevicesXML = '' | |
18 | <filesystem type="mount"> | |
19 | <source dir="/var/lib/caldance"/> | |
20 | <target dir="home"/> | |
21 | </filesystem> | |
22 | ''; | |
23 | }; | |
24 | buildbot = { | |
25 | pool = "zfspool"; | |
26 | cpus = "1"; | |
27 | memory = "3"; | |
28 | network = "immae"; | |
29 | diskSize = "10GiB"; | |
30 | destroyVolumeOnExit = true; | |
31 | preStart = '' | |
32 | if ! ${pkgs.libvirt}/bin/virsh pool-info --pool niximages &> /dev/null; then | |
33 | pool-create-as --name niximages --type dir --target /etc/libvirtd/base-images/ | |
34 | fi | |
35 | if ! ${pkgs.libvirt}/bin/virsh pool-info --pool buildbot-disks &> /dev/null; then | |
36 | mkdir -p /var/lib/libvirt/images/buildbot-disks | |
37 | pool-create-as --name buildbot-disks --type dir --target /var/lib/libvirt/images/buildbot-disks | |
38 | fi | |
39 | ''; | |
40 | }; | |
41 | }; | |
42 | toImage = f: "${import ./vms/base_image.nix f (args // { myEnv = config.myEnv; })}/nixos.qcow2"; | |
43 | in | |
44 | { | |
45 | environment.etc."libvirtd/base-images/nixos.qcow2".source = toImage ./vms/base_configuration.nix; | |
46 | environment.etc."libvirtd/base-images/buildbot.qcow2".source = toImage ./vms/buildbot_configuration.nix; | |
47 | systemd.services = lib.mapAttrs' (name: guest: lib.nameValuePair "libvirtd-guest-${name}" { | |
48 | after = [ "libvirtd.service" "libvirtd-network-${guest.network}.service" ]; | |
49 | requires = [ "libvirtd.service" "libvirtd-network-${guest.network}.service" ]; | |
50 | wantedBy = [ "multi-user.target" ]; | |
51 | serviceConfig = { | |
52 | Type = "oneshot"; | |
53 | RemainAfterExit = "yes"; | |
54 | }; | |
55 | script = | |
56 | let | |
57 | xml = pkgs.writeText "libvirt-guest-${name}.xml" | |
58 | '' | |
59 | <domain type="kvm"> | |
60 | <name>${name}</name> | |
61 | <uuid>UUID</uuid> | |
62 | <memory unit="GiB">${guest.memory}</memory> | |
63 | <vcpu>${guest.cpus}</vcpu> | |
64 | <os> | |
65 | <type arch="x86_64">hvm</type> | |
66 | </os> | |
67 | <devices> | |
68 | <emulator>/run/current-system/sw/bin/qemu-system-x86_64</emulator> | |
69 | <disk type="volume"> | |
70 | <source pool="${guest.pool}" volume="guest-${name}" /> | |
71 | <target dev="vda" bus="virtio"/> | |
72 | </disk> | |
73 | ${guest.extraDevicesXML or ""} | |
74 | <input type="keyboard" bus="usb"/> | |
75 | <graphics type="vnc" port="-1" autoport="yes"/> | |
76 | <interface type="network"> | |
77 | <source network="${guest.network}" /> | |
78 | </interface> | |
79 | </devices> | |
80 | <features> | |
81 | <acpi/> | |
82 | </features> | |
83 | </domain> | |
84 | ''; | |
85 | in | |
86 | guest.preStart or "" + '' | |
87 | if ! ${pkgs.libvirt}/bin/virsh vol-key 'guest-${name}' --pool ${guest.pool} &> /dev/null; then | |
88 | ${pkgs.libvirt}/bin/virsh vol-create-as --pool ${guest.pool} --name 'guest-${name}' --capacity '${guest.diskSize}' | |
89 | volume_path=$(${pkgs.libvirt}/bin/virsh vol-path --pool ${guest.pool} --vol 'guest-${name}') | |
90 | ${pkgs.qemu}/bin/qemu-img convert /etc/libvirtd/base-images/nixos.qcow2 $volume_path | |
91 | fi | |
92 | uuid="$(${pkgs.libvirt}/bin/virsh domuuid '${name}' || true)" | |
93 | ${pkgs.libvirt}/bin/virsh define <(sed "s/UUID/$uuid/" '${xml}') | |
94 | ${pkgs.libvirt}/bin/virsh start '${name}' | |
95 | ''; | |
96 | preStop = '' | |
97 | ${pkgs.libvirt}/bin/virsh shutdown '${name}' | |
98 | let "timeout = $(date +%s) + 10" | |
99 | while [ "$(${pkgs.libvirt}/bin/virsh list --name | grep --count '^${name}$')" -gt 0 ]; do | |
100 | if [ "$(date +%s)" -ge "$timeout" ]; then | |
101 | # Meh, we warned it... | |
102 | ${pkgs.libvirt}/bin/virsh destroy '${name}' | |
103 | else | |
104 | # The machine is still running, let's give it some time to shut down | |
105 | sleep 0.5 | |
106 | fi | |
107 | done | |
108 | '' + lib.optionalString (guest.destroyVolumeOnExit or false) '' | |
109 | if ${pkgs.libvirt}/bin/virsh vol-key 'guest-${name}' --pool ${guest.pool} &> /dev/null; then | |
110 | ${pkgs.libvirt}/bin/virsh vol-wipe --pool ${guest.pool} --vol 'guest-${name}' || true | |
111 | ${pkgs.libvirt}/bin/virsh vol-delete --pool ${guest.pool} --vol 'guest-${name}' | |
112 | fi | |
113 | ''; | |
114 | }) guests // (lib.mapAttrs' (name: network: lib.nameValuePair "libvirtd-network-${name}" { | |
115 | after = [ "libvirtd.service" ]; | |
116 | requires = [ "libvirtd.service" ]; | |
117 | wantedBy = [ "multi-user.target" ]; | |
118 | serviceConfig = { | |
119 | Type = "oneshot"; | |
120 | RemainAfterExit = "yes"; | |
121 | }; | |
122 | script = let | |
123 | xml = pkgs.writeText "libvirt-network-${name}.xml" '' | |
124 | <network> | |
125 | <name>${name}</name> | |
126 | <uuid>UUID</uuid> | |
127 | <forward mode='nat' /> | |
128 | <bridge name='virbr${network.bridgeNumber}' /> | |
129 | <domain name='${name}' localOnly='yes'/> | |
130 | <ip address='${network.ipRange}.1' netmask='255.255.255.0'> | |
131 | <dhcp> | |
132 | <range start='${network.ipRange}.2' end='${network.ipRange}.254'/> | |
133 | </dhcp> | |
134 | </ip> | |
135 | </network> | |
136 | ''; | |
137 | in '' | |
138 | uuid="$(${pkgs.libvirt}/bin/virsh net-uuid '${name}' || true)" | |
139 | ${pkgs.libvirt}/bin/virsh net-define <(sed "s/UUID/$uuid/" '${xml}') | |
140 | ${pkgs.libvirt}/bin/virsh net-start '${name}' | |
141 | ''; | |
142 | preStop = '' | |
143 | ${pkgs.libvirt}/bin/virsh net-destroy '${name}' | |
144 | ''; | |
145 | }) networks); | |
146 | } |