89 lines
3.2 KiB
Nix
89 lines
3.2 KiB
Nix
{ nixpkgs, system }:
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let pkgs = import nixpkgs { config = {}; inherit system; }; in
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with pkgs;
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with import ../lib/qemu-flags.nix;
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rec {
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inherit pkgs;
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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 =
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nodes: let nodesOut = lib.mapAttrs (n: buildVM nodesOut) (assignIPAddresses nodes); in nodesOut;
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buildVM =
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nodes: configurations:
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import ./eval-config.nix {
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inherit nixpkgs system;
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modules = configurations ++
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[ ../modules/virtualisation/qemu-vm.nix
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../modules/testing/test-instrumentation.nix # !!! should only get added for automated test runs
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{ key = "no-manual"; services.nixosManual.enable = false; }
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];
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extraArgs = { inherit nodes; };
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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 = lib.attrNames nodes;
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machinesNumbered = lib.zipTwoLists machines (lib.range 1 254);
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nodes_ = lib.flip map machinesNumbered (m: lib.nameValuePair m.first
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[ ( { config, pkgs, nodes, ... }:
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let
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interfacesNumbered = lib.zipTwoLists config.virtualisation.vlans (lib.range 1 255);
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interfaces =
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lib.flip map interfacesNumbered ({ first, second }:
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{ name = "eth${toString second}";
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ipAddress = "192.168.${toString first}.${toString m.second}";
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subnetMask = "255.255.255.0";
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}
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);
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in
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{ key = "ip-address";
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config =
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{ networking.hostName = m.first;
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networking.interfaces = interfaces;
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networking.primaryIPAddress =
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lib.optionalString (interfaces != []) (lib.head interfaces).ipAddress;
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# Put the IP addresses of all VMs in this machine's
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# /etc/hosts file. If a machine has multiple
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# interfaces, use the IP address corresponding to
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# the first interface (i.e. the first network in its
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# virtualisation.vlans option).
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networking.extraHosts = lib.flip lib.concatMapStrings machines
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(m: let config = (lib.getAttr m nodes).config; in
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lib.optionalString (config.networking.primaryIPAddress != "")
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("${config.networking.primaryIPAddress} " +
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"${config.networking.hostName}\n"));
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virtualisation.qemu.options =
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lib.flip lib.concatMapStrings interfacesNumbered
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({ first, second }: qemuNICFlags second first m.second);
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};
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}
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)
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(lib.getAttr m.first nodes)
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] );
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in lib.listToAttrs nodes_;
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}
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