mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-01 15:11:25 +00:00
129 lines
3.9 KiB
Nix
129 lines
3.9 KiB
Nix
# This module allows the test driver to connect to the virtual machine
|
|
# via a root shell attached to port 514.
|
|
|
|
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let kernel = config.boot.kernelPackages.kernel; in
|
|
|
|
{
|
|
|
|
config = {
|
|
|
|
systemd.services.backdoor =
|
|
{ wantedBy = [ "multi-user.target" ];
|
|
requires = [ "dev-hvc0.device" "dev-ttyS0.device" ];
|
|
after = [ "dev-hvc0.device" "dev-ttyS0.device" ];
|
|
script =
|
|
''
|
|
export USER=root
|
|
export HOME=/root
|
|
export DISPLAY=:0.0
|
|
|
|
source /etc/profile
|
|
|
|
# Don't use a pager when executing backdoor
|
|
# actions. Because we use a tty, commands like systemctl
|
|
# or nix-store get confused into thinking they're running
|
|
# interactively.
|
|
export PAGER=
|
|
|
|
cd /tmp
|
|
exec < /dev/hvc0 > /dev/hvc0
|
|
while ! exec 2> /dev/ttyS0; do sleep 0.1; done
|
|
echo "connecting to host..." >&2
|
|
stty -F /dev/hvc0 raw -echo # prevent nl -> cr/nl conversion
|
|
echo
|
|
PS1= exec /bin/sh
|
|
'';
|
|
serviceConfig.KillSignal = "SIGHUP";
|
|
};
|
|
|
|
# Prevent agetty from being instantiated on ttyS0, since it
|
|
# interferes with the backdoor (writes to ttyS0 will randomly fail
|
|
# with EIO). Likewise for hvc0.
|
|
systemd.services."serial-getty@ttyS0".enable = false;
|
|
systemd.services."serial-getty@hvc0".enable = false;
|
|
|
|
boot.initrd.preDeviceCommands =
|
|
''
|
|
echo 600 > /proc/sys/kernel/hung_task_timeout_secs
|
|
'';
|
|
|
|
boot.initrd.postDeviceCommands =
|
|
''
|
|
# Using acpi_pm as a clock source causes the guest clock to
|
|
# slow down under high host load. This is usually a bad
|
|
# thing, but for VM tests it should provide a bit more
|
|
# determinism (e.g. if the VM runs at lower speed, then
|
|
# timeouts in the VM should also be delayed).
|
|
echo acpi_pm > /sys/devices/system/clocksource/clocksource0/current_clocksource
|
|
'';
|
|
|
|
boot.postBootCommands =
|
|
''
|
|
# Panic on out-of-memory conditions rather than letting the
|
|
# OOM killer randomly get rid of processes, since this leads
|
|
# to failures that are hard to diagnose.
|
|
echo 2 > /proc/sys/vm/panic_on_oom
|
|
|
|
# Coverage data is written into /tmp/coverage-data.
|
|
mkdir -p /tmp/xchg/coverage-data
|
|
'';
|
|
|
|
# If the kernel has been built with coverage instrumentation, make
|
|
# it available under /proc/gcov.
|
|
boot.kernelModules = [ "gcov-proc" ];
|
|
|
|
# Panic if an error occurs in stage 1 (rather than waiting for
|
|
# user intervention).
|
|
boot.kernelParams =
|
|
[ "console=ttyS0" "panic=1" "boot.panic_on_fail" ];
|
|
|
|
# `xwininfo' is used by the test driver to query open windows.
|
|
environment.systemPackages = [ pkgs.xorg.xwininfo ];
|
|
|
|
# Log everything to the serial console.
|
|
services.journald.extraConfig =
|
|
''
|
|
ForwardToConsole=yes
|
|
MaxLevelConsole=debug
|
|
'';
|
|
|
|
# Don't clobber the console with duplicate systemd messages.
|
|
systemd.extraConfig = "ShowStatus=no";
|
|
|
|
boot.consoleLogLevel = 7;
|
|
|
|
# Prevent tests from accessing the Internet.
|
|
networking.defaultGateway = mkOverride 150 "";
|
|
networking.nameservers = mkOverride 150 [ ];
|
|
|
|
systemd.globalEnvironment.GCOV_PREFIX = "/tmp/xchg/coverage-data";
|
|
|
|
system.requiredKernelConfig = with config.lib.kernelConfig; [
|
|
(isYes "SERIAL_8250_CONSOLE")
|
|
(isYes "SERIAL_8250")
|
|
(isEnabled "VIRTIO_CONSOLE")
|
|
];
|
|
|
|
networking.usePredictableInterfaceNames = false;
|
|
|
|
# Make it easy to log in as root when running the test interactively.
|
|
users.extraUsers.root.initialHashedPassword = mkOverride 150 "";
|
|
|
|
services.xserver.displayManager.logToJournal = true;
|
|
|
|
# Bump kdm's X server start timeout to account for heavily loaded
|
|
# VM host systems.
|
|
services.xserver.displayManager.kdm.extraConfig =
|
|
''
|
|
[X-:*-Core]
|
|
ServerTimeout=240
|
|
'';
|
|
|
|
};
|
|
|
|
}
|