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author | Katharina Fey <kookie@spacekookie.de> | 2019-10-05 12:43:18 +0000 |
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committer | Katharina Fey <kookie@spacekookie.de> | 2019-10-05 12:44:52 +0000 |
commit | cf85056ba64caf3267d43255ef4a1243e9c8ee3b (patch) | |
tree | 3051519e9c8275b870aac43f80af875715c9d124 /nixpkgs/nixos/lib/build-vms.nix | |
parent | 1148b1d122bc03e9a3665856c9b7bb96bd4e3994 (diff) | |
parent | 2436c27541b2f52deea3a4c1691216a02152e729 (diff) |
Add 'nixpkgs/' from commit '2436c27541b2f52deea3a4c1691216a02152e729'
git-subtree-dir: nixpkgs
git-subtree-mainline: 1148b1d122bc03e9a3665856c9b7bb96bd4e3994
git-subtree-split: 2436c27541b2f52deea3a4c1691216a02152e729
Diffstat (limited to 'nixpkgs/nixos/lib/build-vms.nix')
-rw-r--r-- | nixpkgs/nixos/lib/build-vms.nix | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/nixpkgs/nixos/lib/build-vms.nix b/nixpkgs/nixos/lib/build-vms.nix new file mode 100644 index 00000000000..1bad63b9194 --- /dev/null +++ b/nixpkgs/nixos/lib/build-vms.nix @@ -0,0 +1,101 @@ +{ system +, # Use a minimal kernel? + minimal ? false +, # Ignored + config ? null + # Nixpkgs, for qemu, lib and more +, pkgs +, # NixOS configuration to add to the VMs + extraConfigurations ? [] +}: + +with pkgs.lib; +with import ../lib/qemu-flags.nix { inherit pkgs; }; + +rec { + + inherit pkgs; + + qemu = pkgs.qemu_test; + + + # 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 ++ extraConfigurations; + baseModules = (import ../modules/module-list.nix) ++ + [ ../modules/virtualisation/qemu-vm.nix + ../modules/testing/test-instrumentation.nix # !!! should only get added for automated test runs + { key = "no-manual"; documentation.nixos.enable = false; } + { key = "qemu"; system.build.qemu = qemu; } + { key = "nodes"; _module.args.nodes = nodes; } + ] ++ optional minimal ../modules/testing/minimal-kernel.nix; + }; + + + # 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 = zipLists machines (range 1 254); + + nodes_ = forEach machinesNumbered (m: nameValuePair m.fst + [ ( { config, nodes, ... }: + let + interfacesNumbered = zipLists config.virtualisation.vlans (range 1 255); + interfaces = forEach interfacesNumbered ({ fst, snd }: + nameValuePair "eth${toString snd}" { ipv4.addresses = + [ { address = "192.168.${toString fst}.${toString m.snd}"; + prefixLength = 24; + } ]; + }); + in + { key = "ip-address"; + config = + { networking.hostName = mkDefault m.fst; + + networking.interfaces = listToAttrs interfaces; + + networking.primaryIPAddress = + optionalString (interfaces != []) (head (head interfaces).value.ipv4.addresses).address; + + # Put the IP addresses of all VMs in this machine's + # /etc/hosts file. If a machine has multiple + # interfaces, use the IP address corresponding to + # the first interface (i.e. the first network in its + # virtualisation.vlans option). + networking.extraHosts = flip concatMapStrings machines + (m': let config = (getAttr m' nodes).config; in + optionalString (config.networking.primaryIPAddress != "") + ("${config.networking.primaryIPAddress} " + + optionalString (config.networking.domain != null) + "${config.networking.hostName}.${config.networking.domain} " + + "${config.networking.hostName}\n")); + + virtualisation.qemu.options = + forEach interfacesNumbered + ({ fst, snd }: qemuNICFlags snd fst m.snd); + }; + } + ) + (getAttr m.fst nodes) + ] ); + + in listToAttrs nodes_; + +} |