9aa0a336bc
now merged in the kernel, and the gcda files are exported through debugfs in /sys/kernel/debug/gcov. svn path=/nixos/trunk/; revision=19207
52 lines
1.4 KiB
Nix
52 lines
1.4 KiB
Nix
# 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 =
|
|
''
|
|
# 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. Symlink
|
|
# it to the host filesystem so that we don't need to copy it
|
|
# on shutdown.
|
|
( eval $(cat /proc/cmdline)
|
|
mkdir /hostfs/$hostTmpDir/coverage-data
|
|
ln -s /hostfs/$hostTmpDir/coverage-data /tmp/coverage-data
|
|
)
|
|
|
|
# Mount debugfs to gain access to the kernel coverage data (if
|
|
# available).
|
|
mount -t debugfs none /sys/kernel/debug || true
|
|
'';
|
|
|
|
# If the kernel has been built with coverage instrumentation, make
|
|
# it available under /proc/gcov.
|
|
boot.kernelModules = [ "gcov-proc" ];
|
|
|
|
};
|
|
|
|
}
|