nixpkgs/modules/testing/test-instrumentation.nix

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# This module allows the test driver to connect to the virtual machine
# via a root shell attached to port 514.
{ config, pkgs, ... }:
with pkgs.lib;
{
config = {
jobs.backdoor =
{ startOn = "started network-interfaces";
preStart =
''
eval $(cat /proc/cmdline)
echo "guest running, will write in $hostTmpDir on host" > /dev/ttyS0
touch /hostfs/$hostTmpDir/running
'';
exec = "${pkgs.socat}/bin/socat tcp-listen:514,fork exec:/bin/sh,stderr";
};
boot.postBootCommands =
''
( eval $(cat /proc/cmdline)
mkdir /hostfs/$hostTmpDir/coverage-data
ln -s /hostfs/$hostTmpDir/coverage-data /tmp/coverage-data
)
'';
# If the kernel has been built with coverage instrumentation, make
# it available under /proc/gcov.
boot.kernelModules = [ "gcov-proc" ];
};
}