225 lines
7.7 KiB
Nix
225 lines
7.7 KiB
Nix
# This module allows the test driver to connect to the virtual machine
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# via a root shell attached to port 514.
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{ options, config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.testing;
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qemu-common = import ../../lib/qemu-common.nix { inherit lib pkgs; };
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backdoorService = {
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requires = [ "dev-hvc0.device" "dev-${qemu-common.qemuSerialDevice}.device" ];
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after = [ "dev-hvc0.device" "dev-${qemu-common.qemuSerialDevice}.device" ];
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script =
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''
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export USER=root
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export HOME=/root
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export DISPLAY=:0.0
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if [[ -e /etc/profile ]]; then
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source /etc/profile
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fi
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# Don't use a pager when executing backdoor
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# actions. Because we use a tty, commands like systemctl
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# or nix-store get confused into thinking they're running
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# interactively.
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export PAGER=
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cd /tmp
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exec < /dev/hvc0 > /dev/hvc0
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while ! exec 2> /dev/${qemu-common.qemuSerialDevice}; do sleep 0.1; done
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echo "connecting to host..." >&2
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stty -F /dev/hvc0 raw -echo # prevent nl -> cr/nl conversion
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# The following line is essential since it signals to
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# the test driver that the shell is ready.
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# See: the connect method in the Machine class.
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echo "Spawning backdoor root shell..."
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# Passing the terminal device makes bash run non-interactively.
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# Otherwise we get errors on the terminal because bash tries to
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# setup things like job control.
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# Note: calling bash explicitly here instead of sh makes sure that
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# we can also run non-NixOS guests during tests.
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PS1= exec /usr/bin/env bash --norc /dev/hvc0
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'';
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serviceConfig.KillSignal = "SIGHUP";
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};
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in
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{
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options.testing = {
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initrdBackdoor = lib.mkEnableOption (lib.mdDoc ''
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enable backdoor.service in initrd. Requires
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boot.initrd.systemd.enable to be enabled. Boot will pause in
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stage 1 at initrd.target, and will listen for commands from the
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Machine python interface, just like stage 2 normally does. This
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enables commands to be sent to test and debug stage 1. Use
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machine.switch_root() to leave stage 1 and proceed to stage 2.
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'');
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};
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config = {
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assertions = [
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{
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assertion = cfg.initrdBackdoor -> config.boot.initrd.systemd.enable;
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message = ''
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testing.initrdBackdoor requires boot.initrd.systemd.enable to be enabled.
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'';
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}
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];
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systemd.services.backdoor = lib.mkMerge [
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backdoorService
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{
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wantedBy = [ "multi-user.target" ];
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}
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];
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boot.initrd.systemd = lib.mkMerge [
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{
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contents."/etc/systemd/journald.conf".text = ''
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[Journal]
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ForwardToConsole=yes
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MaxLevelConsole=debug
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'';
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extraConfig = config.systemd.extraConfig;
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}
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(lib.mkIf cfg.initrdBackdoor {
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# Implemented in machine.switch_root(). Suppress the unit by
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# making it a noop without removing it, which would break
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# initrd-parse-etc.service
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services.initrd-cleanup.serviceConfig.ExecStart = [
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# Reset
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""
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# noop
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"/bin/true"
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];
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services.backdoor = lib.mkMerge [
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backdoorService
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{
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# TODO: Both stage 1 and stage 2 should use these same
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# settings. But a lot of existing tests rely on
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# backdoor.service having default orderings,
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# e.g. systemd-boot.update relies on /boot being mounted
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# as soon as backdoor starts. But it can be useful for
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# backdoor to start even earlier.
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wantedBy = [ "sysinit.target" ];
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unitConfig.DefaultDependencies = false;
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conflicts = [ "shutdown.target" "initrd-switch-root.target" ];
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before = [ "shutdown.target" "initrd-switch-root.target" ];
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}
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];
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contents."/usr/bin/env".source = "${pkgs.coreutils}/bin/env";
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})
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];
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# Prevent agetty from being instantiated on the serial device, since it
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# interferes with the backdoor (writes to it will randomly fail
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# with EIO). Likewise for hvc0.
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systemd.services."serial-getty@${qemu-common.qemuSerialDevice}".enable = false;
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systemd.services."serial-getty@hvc0".enable = false;
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# Only set these settings when the options exist. Some tests (e.g. those
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# that do not specify any nodes, or an empty attr set as nodes) will not
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# have the QEMU module loaded and thuse these options can't and should not
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# be set.
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virtualisation = lib.optionalAttrs (options ? virtualisation.qemu) {
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qemu = {
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# Only use a serial console, no TTY.
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# NOTE: optionalAttrs
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# test-instrumentation.nix appears to be used without qemu-vm.nix, so
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# we avoid defining consoles if not possible.
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# TODO: refactor such that test-instrumentation can import qemu-vm
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# or declare virtualisation.qemu.console option in a module that's always imported
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consoles = [ qemu-common.qemuSerialDevice ];
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package = lib.mkDefault pkgs.qemu_test;
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};
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};
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boot.kernel.sysctl = {
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"kernel.hung_task_timeout_secs" = 600;
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# Panic on out-of-memory conditions rather than letting the
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# OOM killer randomly get rid of processes, since this leads
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# to failures that are hard to diagnose.
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"vm.panic_on_oom" = lib.mkDefault 2;
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};
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boot.kernelParams = [
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"console=${qemu-common.qemuSerialDevice}"
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# Panic if an error occurs in stage 1 (rather than waiting for
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# user intervention).
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"panic=1" "boot.panic_on_fail"
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# Using acpi_pm as a clock source causes the guest clock to
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# slow down under high host load. This is usually a bad
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# thing, but for VM tests it should provide a bit more
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# determinism (e.g. if the VM runs at lower speed, then
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# timeouts in the VM should also be delayed).
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"clock=acpi_pm"
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];
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# `xwininfo' is used by the test driver to query open windows.
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environment.systemPackages = [ pkgs.xorg.xwininfo ];
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# Log everything to the serial console.
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services.journald.extraConfig =
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''
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ForwardToConsole=yes
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MaxLevelConsole=debug
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'';
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systemd.extraConfig = ''
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# Don't clobber the console with duplicate systemd messages.
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ShowStatus=no
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# Allow very slow start
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DefaultTimeoutStartSec=300
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DefaultDeviceTimeoutSec=300
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'';
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systemd.user.extraConfig = ''
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# Allow very slow start
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DefaultTimeoutStartSec=300
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DefaultDeviceTimeoutSec=300
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'';
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boot.consoleLogLevel = 7;
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# Prevent tests from accessing the Internet.
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networking.defaultGateway = mkOverride 150 null;
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networking.nameservers = mkOverride 150 [ ];
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system.requiredKernelConfig = with config.lib.kernelConfig; [
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(isYes "SERIAL_8250_CONSOLE")
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(isYes "SERIAL_8250")
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(isEnabled "VIRTIO_CONSOLE")
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];
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networking.usePredictableInterfaceNames = false;
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# Make it easy to log in as root when running the test interactively.
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# This needs to be a file because of a quirk in systemd credentials,
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# where you cannot specify an empty string as a value. systemd-sysusers
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# uses credentials to set passwords on users.
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users.users.root.hashedPasswordFile = mkOverride 150 "${pkgs.writeText "hashed-password.root" ""}";
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services.xserver.displayManager.job.logToJournal = true;
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# Make sure we use the Guest Agent from the QEMU package for testing
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# to reduce the closure size required for the tests.
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services.qemuGuest.package = pkgs.qemu_test.ga;
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# Squelch warning about unset system.stateVersion
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system.stateVersion = lib.mkDefault lib.trivial.release;
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};
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}
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