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testing-instrumentation: Factor backdoor service out to variable

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This commit is contained in:
Will Fancher 2023-09-19 23:30:52 -04:00
parent cfbb29d769
commit f8ba8be54b
1 changed files with 39 additions and 36 deletions
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75
nixos/modules/testing/test-instrumentation.nix
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@ -7,48 +7,51 @@ with lib;
let
qemu-common = import ../../lib/qemu-common.nix { inherit lib pkgs; };
backdoorService = {
wantedBy = [ "multi-user.target" ];
requires = [ "dev-hvc0.device" "dev-${qemu-common.qemuSerialDevice}.device" ];
after = [ "dev-hvc0.device" "dev-${qemu-common.qemuSerialDevice}.device" ];
script =
''
export USER=root
export HOME=/root
export DISPLAY=:0.0
source /etc/profile
# Don't use a pager when executing backdoor
# actions. Because we use a tty, commands like systemctl
# or nix-store get confused into thinking they're running
# interactively.
export PAGER=
cd /tmp
exec < /dev/hvc0 > /dev/hvc0
while ! exec 2> /dev/${qemu-common.qemuSerialDevice}; do sleep 0.1; done
echo "connecting to host..." >&2
stty -F /dev/hvc0 raw -echo # prevent nl -> cr/nl conversion
# The following line is essential since it signals to
# the test driver that the shell is ready.
# See: the connect method in the Machine class.
echo "Spawning backdoor root shell..."
# Passing the terminal device makes bash run non-interactively.
# Otherwise we get errors on the terminal because bash tries to
# setup things like job control.
# Note: calling bash explicitly here instead of sh makes sure that
# we can also run non-NixOS guests during tests.
PS1= exec /usr/bin/env bash --norc /dev/hvc0
'';
serviceConfig.KillSignal = "SIGHUP";
};
in
{
config = {
systemd.services.backdoor =
{ wantedBy = [ "multi-user.target" ];
requires = [ "dev-hvc0.device" "dev-${qemu-common.qemuSerialDevice}.device" ];
after = [ "dev-hvc0.device" "dev-${qemu-common.qemuSerialDevice}.device" ];
script =
''
export USER=root
export HOME=/root
export DISPLAY=:0.0
source /etc/profile
# Don't use a pager when executing backdoor
# actions. Because we use a tty, commands like systemctl
# or nix-store get confused into thinking they're running
# interactively.
export PAGER=
cd /tmp
exec < /dev/hvc0 > /dev/hvc0
while ! exec 2> /dev/${qemu-common.qemuSerialDevice}; do sleep 0.1; done
echo "connecting to host..." >&2
stty -F /dev/hvc0 raw -echo # prevent nl -> cr/nl conversion
# The following line is essential since it signals to
# the test driver that the shell is ready.
# See: the connect method in the Machine class.
echo "Spawning backdoor root shell..."
# Passing the terminal device makes bash run non-interactively.
# Otherwise we get errors on the terminal because bash tries to
# setup things like job control.
# Note: calling bash explicitly here instead of sh makes sure that
# we can also run non-NixOS guests during tests.
PS1= exec /usr/bin/env bash --norc /dev/hvc0
'';
serviceConfig.KillSignal = "SIGHUP";
};
systemd.services.backdoor = backdoorService
# Prevent agetty from being instantiated on the serial device, since it
# interferes with the backdoor (writes to it will randomly fail