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tailscale/tstest/integration/vms/runner.nix

78 lines
2.3 KiB
Nix

# This is a NixOS module to allow a machine to act as an integration test
# runner. This is used for the end-to-end VM test suite.
{ lib, config, pkgs, ... }:
{
# The GitHub Actions self-hosted runner service.
services.github-runner = {
enable = true;
url = "https://github.com/tailscale/tailscale";
replace = true;
extraLabels = [ "vm_integration_test" ];
# Justifications for the packages:
extraPackages = with pkgs; [
# The test suite is written in Go.
go
# This contains genisoimage, which is needed to create cloud-init
# seeds.
cdrkit
# This package is the virtual machine hypervisor we use in tests.
qemu
# This package contains tools like `ssh-keygen`.
openssh
# The C complier so cgo builds work.
gcc
];
# Customize this to include your GitHub username so we can track
# who is running which node.
name = "YOUR-GITHUB-USERNAME-tstest-integration-vms";
# Replace this with the path to the GitHub Actions runner token on
# your disk.
tokenFile = "/run/decrypted/ts-oss-ghaction-token";
};
# A user account so there is a home directory and so they have kvm
# access. Please don't change this account name.
users.users.ghrunner = {
createHome = true;
isSystemUser = true;
extraGroups = [ "kvm" ];
};
# The default github-runner service sets a lot of isolation features
# that attempt to limit the damage that malicious code can use.
# Unfortunately we rely on some "dangerous" features to do these tests,
# so this shim will peel some of them away.
systemd.services.github-runner = {
serviceConfig = {
# We need access to /dev to poke /dev/kvm.
PrivateDevices = lib.mkForce false;
# /dev/kvm is how qemu creates a virtual machine with KVM.
DeviceAllow = lib.mkForce [ "/dev/kvm" ];
# Ensure the service has KVM permissions with the `kvm` group.
ExtraGroups = [ "kvm" ];
# The service runs as a dynamic user by default. This makes it hard
# to persistently store things in /var/lib/ghrunner. This line
# disables the dynamic user feature.
DynamicUser = lib.mkForce false;
# Run this service as our ghrunner user.
User = "ghrunner";
# We need access to /var/lib/ghrunner to store VM images.
ProtectSystem = lib.mkForce null;
};
};
}