54 lines
1.5 KiB
Nix
54 lines
1.5 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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{
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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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exec = "${pkgs.socat}/bin/socat tcp-listen:514,fork exec:/bin/sh 2> /dev/ttyS0";
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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 = [ "stage1panic" ];
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};
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}
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