329a4461a7
Make sure the all derivations referenced by the test script are available on the nodes. Accessing these derivations works just fine without this change when using 9p to mount the host's store, but when an image is built (virtualisation.buildRootImage), the dependencies need to be copied to the image. We don't want to copy the script itself, though, since that would trigger unnecessary image rebuilds.
286 lines
9.5 KiB
Nix
286 lines
9.5 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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# Reifies and correctly wraps the python test driver for
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# the respective qemu version and with or without ocr support
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pythonTestDriver = {
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qemu_pkg ? pkgs.qemu_test
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, enableOCR ? false
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}:
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let
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name = "nixos-test-driver";
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testDriverScript = ./test-driver/test-driver.py;
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ocrProg = tesseract4.override { enableLanguages = [ "eng" ]; };
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imagemagick_tiff = imagemagick_light.override { inherit libtiff; };
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in stdenv.mkDerivation {
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inherit name;
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nativeBuildInputs = [ makeWrapper ];
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buildInputs = [ (python3.withPackages (p: [ p.ptpython p.colorama ])) ];
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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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buildPhase = ''
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python <<EOF
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from pydoc import importfile
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with open('driver-symbols', 'w') as fp:
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t = importfile('${testDriverScript}')
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d = t.Driver([],[],"")
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test_symbols = d.test_symbols()
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fp.write(','.join(test_symbols.keys()))
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EOF
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'';
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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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--argv0 ${name} \
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--prefix PATH : "${lib.makeBinPath [ qemu_pkg vde2 netpbm coreutils socat ]}" \
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${lib.optionalString enableOCR
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"--prefix PATH : '${ocrProg}/bin:${imagemagick_tiff}/bin'"} \
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install -m 0644 -vD driver-symbols $out/nix-support/driver-symbols
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'';
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};
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# Run an automated test suite in the given virtual network.
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runTests = { driver, pos }:
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stdenv.mkDerivation {
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name = "vm-test-run-${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 $out
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# effectively mute the XMLLogger
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export LOGFILE=/dev/null
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${driver}/bin/nixos-test-driver
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'';
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passthru = driver.passthru // {
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inherit driver;
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};
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inherit pos; # for better debugging
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};
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# Generate convenience wrappers for running the test driver
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# has vlans, vms and test script defaulted through env variables
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# also instantiates test script with nodes, if it's a function (contract)
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setupDriverForTest = {
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testScript
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, testName
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, nodes
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, qemu_pkg ? pkgs.qemu_test
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, enableOCR ? false
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, skipLint ? false
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, passthru ? {}
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}:
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let
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# FIXME: get this pkg from the module system
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testDriver = pythonTestDriver { inherit qemu_pkg enableOCR;};
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testDriverName =
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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 $name can at most be 50 bytes long.
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maxTestNameLen = 50;
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testNameLen = builtins.stringLength testName;
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in with builtins;
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if testNameLen > maxTestNameLen then
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abort
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("The name of the test '${testName}' must not be longer than ${toString maxTestNameLen} " +
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"it's currently ${toString testNameLen} characters long.")
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else
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"nixos-test-driver-${testName}";
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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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nodeHostNames = map (c: c.config.system.name) (lib.attrValues nodes);
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# TODO: This is an implementation error and needs fixing
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# the testing famework cannot legitimately restrict hostnames further
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# beyond RFC1035
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invalidNodeNames = lib.filter
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(node: builtins.match "^[A-z_]([A-z0-9_]+)?$" node == null)
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nodeHostNames;
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testScript' =
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# Call the test script with the computed nodes.
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if lib.isFunction testScript
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then testScript { inherit nodes; }
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else testScript;
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in
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if lib.length invalidNodeNames > 0 then
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throw ''
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Cannot create machines out of (${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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This is an IMPLEMENTATION ERROR and needs to be fixed. Meanwhile,
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please stick to alphanumeric chars and underscores as separation.
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''
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else lib.warnIf skipLint "Linting is disabled" (runCommand testDriverName
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{
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inherit testName;
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nativeBuildInputs = [ makeWrapper ];
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testScript = testScript';
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preferLocalBuild = true;
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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 $out/bin
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vmStartScripts=($(for i in ${toString vms}; do echo $i/bin/run-*-vm; done))
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echo -n "$testScript" > $out/test-script
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ln -s ${testDriver}/bin/nixos-test-driver $out/bin/nixos-test-driver
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${lib.optionalString (!skipLint) ''
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PYFLAKES_BUILTINS="$(
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echo -n ${lib.escapeShellArg (lib.concatStringsSep "," nodeHostNames)},
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< ${lib.escapeShellArg "${testDriver}/nix-support/driver-symbols"}
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)" ${python3Packages.pyflakes}/bin/pyflakes $out/test-script
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''}
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# set defaults through environment
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# see: ./test-driver/test-driver.py argparse implementation
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wrapProgram $out/bin/nixos-test-driver \
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--set startScripts "''${vmStartScripts[*]}" \
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--set testScript "$out/test-script" \
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--set vlans '${toString vlans}'
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'');
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# Make a full-blown test
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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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, # For meta.position
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pos ? # position used in error messages and for meta.position
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(if t.meta.description or null != null
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then builtins.unsafeGetAttrPos "description" t.meta
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else builtins.unsafeGetAttrPos "testScript" t)
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, ...
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} @ t:
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let
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nodes = qemu_pkg:
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let
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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 { nodes = nodes qemu_pkg; }
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else testScript;
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build-vms = import ./build-vms.nix {
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inherit system lib pkgs minimal specialArgs;
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extraConfigurations = extraConfigurations ++ [(
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{
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virtualisation.qemu.package = qemu_pkg;
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# Make sure all derivations referenced by the test
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# script are available on the nodes. When the store is
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# accessed through 9p, this isn't important, since
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# everything in the store is available to the guest,
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# but when building a root image it is, as all paths
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# that should be available to the guest has to be
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# copied to the image.
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virtualisation.additionalPaths =
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lib.optional
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(builtins.hasContext testScript')
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(pkgs.writeStringReferencesToFile testScript');
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# Ensure we do not use aliases. Ideally this is only set
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# when the test framework is used by Nixpkgs NixOS tests.
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nixpkgs.config.allowAliases = false;
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}
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)];
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};
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in
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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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driver = setupDriverForTest {
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inherit testScript enableOCR skipLint passthru;
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testName = name;
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qemu_pkg = pkgs.qemu_test;
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nodes = nodes pkgs.qemu_test;
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};
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driverInteractive = setupDriverForTest {
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inherit testScript enableOCR skipLint passthru;
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testName = name;
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qemu_pkg = pkgs.qemu;
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nodes = nodes pkgs.qemu;
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};
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test =
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let
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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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in passMeta (runTests { inherit driver pos; });
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in
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test // {
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inherit test driver driverInteractive nodes;
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};
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abortForFunction = functionName: abort ''The ${functionName} function was
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removed because it is not an essential part of the NixOS testing
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infrastructure. It had no usage in NixOS or Nixpkgs and it had no designated
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maintainer. You are free to reintroduce it by documenting it in the manual
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and adding yourself as maintainer. It was removed in
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https://github.com/NixOS/nixpkgs/pull/137013
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'';
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runInMachine = abortForFunction "runInMachine";
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runInMachineWithX = abortForFunction "runInMachineWithX";
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simpleTest = as: (makeTest as).test;
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}
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