114 lines
3.8 KiB
Nix
114 lines
3.8 KiB
Nix
{ system, localSystem, crossSystem
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# Nixpkgs, for qemu, lib and more
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, pkgs, modulesPath
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# NixOS configuration to add to the VMs
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, extraConfigurations ? [ ] }:
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with pkgs.lib;
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with import ./qemu-flags.nix { inherit pkgs; };
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rec {
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inherit pkgs;
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qemu = pkgs.buildPackages.buildPackages.qemu_test;
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# Build a virtual network from an attribute set `{ machine1 =
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# config1; ... machineN = configN; }', where `machineX' is the
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# hostname and `configX' is a NixOS system configuration. Each
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# machine is given an arbitrary IP address in the virtual network.
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buildVirtualNetwork = nodes:
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let nodesOut = mapAttrs (n: buildVM nodesOut) (assignIPAddresses nodes);
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in nodesOut;
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buildVM = nodes: configurations:
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import "${modulesPath}/../lib/eval-config.nix" {
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inherit system;
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modules = configurations ++ extraConfigurations;
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baseModules = (import "${modulesPath}/module-list.nix") ++ [
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../../nixos-modules/genode-core.nix
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../../nixos-modules/genode-init.nix
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../../nixos-modules/qemu-vm.nix
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{
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key = "no-manual";
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documentation.nixos.enable = false;
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}
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{
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key = "qemu";
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system.build.qemu = qemu;
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}
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{
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key = "nodes";
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_module.args.nodes = nodes;
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}
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{
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system.build.qemu = qemu;
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nixpkgs = { inherit system crossSystem localSystem pkgs; };
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}
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];
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};
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# Given an attribute set { machine1 = config1; ... machineN =
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# configN; }, sequentially assign IP addresses in the 192.168.1.0/24
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# range to each machine, and set the hostname to the attribute name.
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assignIPAddresses = nodes:
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let
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machines = attrNames nodes;
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machinesNumbered = zipLists machines (range 1 254);
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nodes_ = forEach machinesNumbered (m:
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nameValuePair m.fst [
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({ config, nodes, ... }:
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let
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interfacesNumbered =
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zipLists config.virtualisation.vlans (range 1 255);
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interfaces = forEach interfacesNumbered ({ fst, snd }:
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nameValuePair "eth${toString snd}" {
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ipv4.addresses = [{
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address = "192.168.${toString fst}.${toString m.snd}";
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prefixLength = 24;
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}];
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genode.driver = "virtio";
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});
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in {
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key = "ip-address";
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config = {
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networking.hostName = mkDefault m.fst;
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networking.interfaces = {
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eth0.genode.driver = "virtio";
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} // listToAttrs interfaces;
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networking.primaryIPAddress = optionalString (interfaces != [ ])
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(head (head interfaces).value.ipv4.addresses).address;
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# Put the IP addresses of all VMs in this machine's
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# /etc/hosts file. If a machine has multiple
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# interfaces, use the IP address corresponding to
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# the first interface (i.e. the first network in its
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# virtualisation.vlans option).
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networking.extraHosts = flip concatMapStrings machines (m':
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let config = (getAttr m' nodes).config;
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in optionalString (config.networking.primaryIPAddress != "")
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("${config.networking.primaryIPAddress} "
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+ optionalString (config.networking.domain != null)
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"${config.networking.hostName}.${config.networking.domain} "
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+ ''
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${config.networking.hostName}
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''));
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virtualisation.qemu.options = forEach interfacesNumbered
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({ fst, snd }: qemuNICFlags snd fst m.snd);
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};
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})
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(getAttr m.fst nodes)
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]);
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in listToAttrs nodes_;
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}
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