{ system, minimal ? false }: let pkgs = import ./nixpkgs.nix { config = {}; inherit system; }; in with pkgs.lib; with import ../lib/qemu-flags.nix; rec { inherit pkgs; # Build a virtual network from an attribute set `{ machine1 = # config1; ... machineN = configN; }', where `machineX' is the # hostname and `configX' is a NixOS system configuration. Each # machine is given an arbitrary IP address in the virtual network. buildVirtualNetwork = nodes: let nodesOut = mapAttrs (n: buildVM nodesOut) (assignIPAddresses nodes); in nodesOut; buildVM = nodes: configurations: import ./eval-config.nix { inherit system; modules = configurations ++ [ ../modules/virtualisation/qemu-vm.nix ../modules/testing/test-instrumentation.nix # !!! should only get added for automated test runs { key = "no-manual"; services.nixosManual.enable = false; } ] ++ optional minimal ../modules/testing/minimal-kernel.nix; extraArgs = { inherit nodes; }; }; # Given an attribute set { machine1 = config1; ... machineN = # configN; }, sequentially assign IP addresses in the 192.168.1.0/24 # range to each machine, and set the hostname to the attribute name. assignIPAddresses = nodes: let machines = attrNames nodes; machinesNumbered = zipTwoLists machines (range 1 254); nodes_ = flip map machinesNumbered (m: nameValuePair m.first [ ( { config, pkgs, nodes, ... }: let interfacesNumbered = zipTwoLists config.virtualisation.vlans (range 1 255); interfaces = flip map interfacesNumbered ({ first, second }: nameValuePair "eth${toString second}" { ip4 = [ { address = "192.168.${toString first}.${toString m.second}"; prefixLength = 24; } ]; }); in { key = "ip-address"; config = { networking.hostName = m.first; networking.interfaces = listToAttrs interfaces; networking.primaryIPAddress = optionalString (interfaces != []) (head (head interfaces).value.ip4).address; # Put the IP addresses of all VMs in this machine's # /etc/hosts file. If a machine has multiple # interfaces, use the IP address corresponding to # the first interface (i.e. the first network in its # virtualisation.vlans option). networking.extraHosts = flip concatMapStrings machines (m': let config = (getAttr m' nodes).config; in optionalString (config.networking.primaryIPAddress != "") ("${config.networking.primaryIPAddress} " + "${config.networking.hostName}\n")); virtualisation.qemu.options = flip map interfacesNumbered ({ first, second }: qemuNICFlags second first m.second); }; } ) (getAttr m.first nodes) ] ); in listToAttrs nodes_; }