85 lines
2.4 KiB
Nix
85 lines
2.4 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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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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jobs.backdoor =
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{ startOn = "started network-interfaces";
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preStart =
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''
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echo "guest running" > /dev/ttyS0
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echo "===UP===" > dev/ttyS0
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'';
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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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export GCOV_PREFIX=/tmp/coverage-data
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source /etc/profile
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cd /tmp
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exec ${pkgs.socat}/bin/socat tcp-listen:514,fork exec:${rootShell} 2> /dev/ttyS0
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'';
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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 $(cat /proc/cmdline)
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mkdir /hostfs/$hostTmpDir/coverage-data
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ln -s /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" ];
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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 (except for
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# kernel messages through klogd, which already appear on the
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# serial port).
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services.syslogd.extraConfig = "*.*,kern.none /dev/ttyS0";
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};
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}
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