{ nixpkgs, system }: let pkgs = import nixpkgs { config = {}; inherit system; }; in with pkgs; 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 = lib.mapAttrs (n: buildVM nodesOut) (assignIPAddresses nodes); in nodesOut; buildVM = nodes: configurations: import ./eval-config.nix { inherit nixpkgs 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; } ]; 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 = lib.attrNames nodes; machinesNumbered = lib.zipTwoLists machines (lib.range 1 254); nodes_ = lib.flip map machinesNumbered (m: lib.nameValuePair m.first [ ( { config, pkgs, nodes, ... }: let interfacesNumbered = lib.zipTwoLists config.virtualisation.vlans (lib.range 1 255); interfaces = lib.flip map interfacesNumbered ({ first, second }: { name = "eth${toString second}"; ipAddress = "192.168.${toString first}.${toString m.second}"; subnetMask = "255.255.255.0"; } ); in { key = "ip-address"; config = { networking.hostName = m.first; networking.interfaces = interfaces; networking.primaryIPAddress = lib.optionalString (interfaces != []) (lib.head interfaces).ipAddress; # Put the IP addresses of all VMs in this machine's # /etc/hosts file. If a machine has multiple # interfaces, use the IP address corresponding to # the first interface (i.e. the first network in its # virtualisation.vlans option). networking.extraHosts = lib.flip lib.concatMapStrings machines (m: let config = (lib.getAttr m nodes).config; in lib.optionalString (config.networking.primaryIPAddress != "") ("${config.networking.primaryIPAddress} " + "${config.networking.hostName}\n")); virtualisation.qemu.options = lib.flip map interfacesNumbered ({ first, second }: qemuNICFlags second first m.second); }; } ) (lib.getAttr m.first nodes) ] ); in lib.listToAttrs nodes_; }