107 lines
3.2 KiB
Nix
107 lines
3.2 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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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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# Urgh, `socat' sets the SIGCHLD to ignore. This wreaks havoc with
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# some programs.
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rootShell = pkgs.writeScript "shell.pl"
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''
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#! ${pkgs.perl}/bin/perl
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$SIG{CHLD} = 'DEFAULT';
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print "\n";
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exec "/bin/sh";
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'';
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in
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{
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config =
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# Require a patch to the kernel to increase the 15s CIFS timeout.
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mkAssert (config.boot.kernelPackages.kernel.features ? cifsTimeout) "
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VM tests require that the kernel has the CIFS timeout patch.
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" {
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jobs.backdoor =
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{ startOn = "startup";
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stopOn = "never";
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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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source /etc/profile
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cd /tmp
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exec < /dev/hvc0 > /dev/hvc0 2> /dev/ttyS0
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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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${pkgs.socat}/bin/socat stdio exec:${rootShell}
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'';
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respawn = false;
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};
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boot.initrd.postDeviceCommands =
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''
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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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echo acpi_pm > /sys/devices/system/clocksource/clocksource0/current_clocksource
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'';
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boot.postBootCommands =
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''
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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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echo 2 > /proc/sys/vm/panic_on_oom
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# Coverage data is written into /tmp/coverage-data. Symlink
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# it to the host filesystem so that we don't need to copy it
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# on shutdown.
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( eval $(cat /proc/cmdline)
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mkdir -p /hostfs/$hostTmpDir/coverage-data
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ln -sfn /hostfs/$hostTmpDir/coverage-data /tmp/coverage-data
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)
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# Mount debugfs to gain access to the kernel coverage data (if
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# available).
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mount -t debugfs none /sys/kernel/debug || true
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'';
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# If the kernel has been built with coverage instrumentation, make
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# it available under /proc/gcov.
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boot.kernelModules = [ "gcov-proc" ];
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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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boot.kernelParams =
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[ "console=tty1" "console=ttyS0" "panic=1" "stage1panic=1" ];
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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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# Send all of /var/log/messages to the serial port.
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services.syslogd.extraConfig = "*.* /dev/ttyS0";
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# Don't run klogd. Kernel messages appear on the serial console anyway.
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jobs.klogd.startOn = mkOverride 50 "";
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# Prevent tests from accessing the Internet.
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networking.defaultGateway = mkOverride 150 "";
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networking.nameservers = mkOverride 150 [ ];
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system.upstartEnvironment.GCOV_PREFIX = "/tmp/coverage-data";
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};
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}
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