nixpkgs/nixos/lib/testing-python.nix
Andreas Rammhold 20893b3a70
nixos/tests: expose both the interactive and non-interactive driver
For a lot of the work the non-interactive drivers are enough and it is
probably a good idea to keep it accessible for debugging without
touching the Nix expression.
2020-10-19 17:39:48 +02:00

273 lines
8.1 KiB
Nix

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