301 lines
9 KiB
Nix
301 lines
9 KiB
Nix
{ system
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, pkgs ? import ../.. { inherit system config; }
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# Use a minimal kernel?
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, minimal ? false
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# Ignored
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, config ? { }
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# !!! See comment about args in lib/modules.nix
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, specialArgs ? { }
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# Modules to add to each VM
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, extraConfigurations ? [ ]
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}:
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with pkgs;
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rec {
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inherit pkgs;
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mkTestDriver =
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let
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testDriverScript = ./test-driver/test-driver.py;
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in
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qemu_pkg: stdenv.mkDerivation {
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name = "nixos-test-driver";
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nativeBuildInputs = [ makeWrapper ];
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buildInputs = [ (python3.withPackages (p: [ p.ptpython ])) ];
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checkInputs = with python3Packages; [ pylint black mypy ];
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dontUnpack = true;
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preferLocalBuild = true;
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doCheck = true;
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checkPhase = ''
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mypy --disallow-untyped-defs \
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--no-implicit-optional \
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--ignore-missing-imports ${testDriverScript}
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pylint --errors-only ${testDriverScript}
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black --check --diff ${testDriverScript}
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'';
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installPhase =
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''
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mkdir -p $out/bin
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cp ${testDriverScript} $out/bin/nixos-test-driver
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chmod u+x $out/bin/nixos-test-driver
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# TODO: copy user script part into this file (append)
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wrapProgram $out/bin/nixos-test-driver \
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--prefix PATH : "${lib.makeBinPath [ qemu_pkg vde2 netpbm coreutils ]}" \
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'';
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};
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# Run an automated test suite in the given virtual network.
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# `driver' is the script that runs the network.
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runTests = driver:
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stdenv.mkDerivation {
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name = "vm-test-run-${driver.testName}";
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requiredSystemFeatures = [ "kvm" "nixos-test" ];
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buildCommand =
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''
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mkdir -p $out
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LOGFILE=/dev/null tests='exec(os.environ["testScript"])' ${driver}/bin/nixos-test-driver
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'';
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passthru = driver.passthru;
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};
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makeTest =
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{ testScript
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, enableOCR ? false
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, name ? "unnamed"
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# Skip linting (mainly intended for faster dev cycles)
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, skipLint ? false
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, passthru ? {}
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, ...
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} @ t:
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let
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# A standard store path to the vm monitor is built like this:
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# /tmp/nix-build-vm-test-run-$name.drv-0/vm-state-machine/monitor
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# The max filename length of a unix domain socket is 108 bytes.
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# This means $name can at most be 50 bytes long.
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maxTestNameLen = 50;
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testNameLen = builtins.stringLength name;
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ocrProg = tesseract4.override { enableLanguages = [ "eng" ]; };
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imagemagick_tiff = imagemagick_light.override { inherit libtiff; };
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# Generate convenience wrappers for running the test driver
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# interactively with the specified network, and for starting the
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# VMs from the command line.
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mkDriver = qemu_pkg:
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let
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build-vms = import ./build-vms.nix {
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inherit system pkgs minimal specialArgs;
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extraConfigurations = extraConfigurations ++ (pkgs.lib.optional (qemu_pkg != null)
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{
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virtualisation.qemu.package = qemu_pkg;
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}
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);
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};
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# FIXME: get this pkg from the module system
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testDriver = mkTestDriver (if qemu_pkg == null then pkgs.qemu_test else qemu_pkg);
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nodes = build-vms.buildVirtualNetwork (
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t.nodes or (if t ? machine then { machine = t.machine; } else { })
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);
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vlans = map (m: m.config.virtualisation.vlans) (lib.attrValues nodes);
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vms = map (m: m.config.system.build.vm) (lib.attrValues nodes);
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testScript' =
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# Call the test script with the computed nodes.
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if lib.isFunction testScript
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then testScript { inherit nodes; }
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else testScript;
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testDriverName = with builtins;
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if testNameLen > maxTestNameLen then
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abort
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("The name of the test '${name}' must not be longer than ${toString maxTestNameLen} " +
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"it's currently ${toString testNameLen} characters long.")
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else
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"nixos-test-driver-${name}";
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warn = if skipLint then lib.warn "Linting is disabled!" else lib.id;
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in
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warn (runCommand testDriverName
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{
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buildInputs = [ makeWrapper ];
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testScript = testScript';
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preferLocalBuild = true;
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testName = name;
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passthru = passthru // {
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inherit nodes;
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};
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}
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''
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mkdir -p $out/bin
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echo -n "$testScript" > $out/test-script
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${lib.optionalString (!skipLint) ''
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${python3Packages.black}/bin/black --check --diff $out/test-script
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''}
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ln -s ${testDriver}/bin/nixos-test-driver $out/bin/
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vms=($(for i in ${toString vms}; do echo $i/bin/run-*-vm; done))
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wrapProgram $out/bin/nixos-test-driver \
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--add-flags "''${vms[*]}" \
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${lib.optionalString enableOCR
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"--prefix PATH : '${ocrProg}/bin:${imagemagick_tiff}/bin'"} \
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--run "export testScript=\"\$(${coreutils}/bin/cat $out/test-script)\"" \
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--set VLANS '${toString vlans}'
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ln -s ${testDriver}/bin/nixos-test-driver $out/bin/nixos-run-vms
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wrapProgram $out/bin/nixos-run-vms \
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--add-flags "''${vms[*]}" \
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${lib.optionalString enableOCR "--prefix PATH : '${ocrProg}/bin'"} \
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--set tests 'start_all(); join_all();' \
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--set VLANS '${toString vlans}' \
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${lib.optionalString (builtins.length vms == 1) "--set USE_SERIAL 1"}
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''); # "
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passMeta = drv: drv // lib.optionalAttrs (t ? meta) {
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meta = (drv.meta or { }) // t.meta;
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};
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driver = mkDriver null;
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driverInteractive = mkDriver pkgs.qemu;
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test = passMeta (runTests driver);
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nodeNames = builtins.attrNames driver.nodes;
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invalidNodeNames = lib.filter
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(node: builtins.match "^[A-z_]([A-z0-9_]+)?$" node == null)
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nodeNames;
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in
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if lib.length invalidNodeNames > 0 then
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throw ''
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Cannot create machines out of (${lib.concatStringsSep ", " invalidNodeNames})!
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All machines are referenced as python variables in the testing framework which will break the
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script when special characters are used.
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Please stick to alphanumeric chars and underscores as separation.
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''
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else
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test // {
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inherit test driver driverInteractive;
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inherit (driver) nodes;
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};
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runInMachine =
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{ drv
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, machine
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, preBuild ? ""
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, postBuild ? ""
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, qemu ? pkgs.qemu_test
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, ... # ???
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}:
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let
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build-vms = import ./build-vms.nix {
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inherit system pkgs minimal specialArgs extraConfigurations;
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};
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vm = build-vms.buildVM { }
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[
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machine
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{
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key = "run-in-machine";
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networking.hostName = "client";
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nix.readOnlyStore = false;
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virtualisation.writableStore = false;
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}
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];
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buildrunner = writeText "vm-build" ''
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source $1
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${coreutils}/bin/mkdir -p $TMPDIR
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cd $TMPDIR
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exec $origBuilder $origArgs
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'';
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testScript = ''
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start_all()
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client.wait_for_unit("multi-user.target")
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${preBuild}
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client.succeed("env -i ${bash}/bin/bash ${buildrunner} /tmp/xchg/saved-env >&2")
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${postBuild}
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client.succeed("sync") # flush all data before pulling the plug
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'';
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vmRunCommand = writeText "vm-run" ''
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xchg=vm-state-client/xchg
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${coreutils}/bin/mkdir $out
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${coreutils}/bin/mkdir -p $xchg
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for i in $passAsFile; do
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i2=''${i}Path
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_basename=$(${coreutils}/bin/basename ''${!i2})
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${coreutils}/bin/cp ''${!i2} $xchg/$_basename
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eval $i2=/tmp/xchg/$_basename
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${coreutils}/bin/ls -la $xchg
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done
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unset i i2 _basename
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export | ${gnugrep}/bin/grep -v '^xchg=' > $xchg/saved-env
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unset xchg
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export tests='${testScript}'
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${mkTestDriver qemu}/bin/nixos-test-driver --keep-vm-state ${vm.config.system.build.vm}/bin/run-*-vm
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''; # */
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in
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lib.overrideDerivation drv (attrs: {
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requiredSystemFeatures = [ "kvm" ];
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builder = "${bash}/bin/sh";
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args = [ "-e" vmRunCommand ];
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origArgs = attrs.args;
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origBuilder = attrs.builder;
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});
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runInMachineWithX = { require ? [ ], ... } @ args:
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let
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client =
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{ ... }:
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{
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inherit require;
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imports = [
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../tests/common/auto.nix
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];
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virtualisation.memorySize = 1024;
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services.xserver.enable = true;
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test-support.displayManager.auto.enable = true;
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services.xserver.displayManager.defaultSession = "none+icewm";
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services.xserver.windowManager.icewm.enable = true;
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};
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in
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runInMachine ({
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machine = client;
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preBuild =
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''
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client.wait_for_x()
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'';
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} // args);
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simpleTest = as: (makeTest as).test;
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}
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