nix-config/modules/services/drone/default.nix

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# A docker-based CI/CD system
#
# Inspired by [1]
# [1]: https://github.com/Mic92/dotfiles/blob/master/nixos/eve/modules/drone.nix
{ config, lib, pkgs, ... }:
let
cfg = config.my.services.drone;
hasRunner = (name: builtins.elem name cfg.runners);
execPkg = pkgs.drone-runner-exec;
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dockerPkg = pkgs.drone-runner-docker;
in
{
options.my.services.drone = with lib; {
enable = mkEnableOption "Drone CI";
runners = mkOption {
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type = with types; listOf (enum [ "exec" "docker" ]);
default = [ ];
example = [ "exec" "docker" ];
description = "Types of runners to enable";
};
admin = mkOption {
type = types.str;
default = "ambroisie";
example = "admin";
description = "Name of the admin user";
};
port = mkOption {
type = types.port;
default = 3030;
example = 8080;
description = "Internal port of the Drone UI";
};
secretFile = mkOption {
type = types.str;
example = "/run/secrets/drone-gitea.env";
description = "Secrets to inject into Drone server";
};
sharedSecretFile = mkOption {
type = types.str;
example = "/run/secrets/drone-rpc.env";
description = "Shared RPC secret to inject into server and runners";
};
};
config = lib.mkIf cfg.enable {
systemd.services.drone-server = {
wantedBy = [ "multi-user.target" ];
after = [ "postgresql.service" ];
serviceConfig = {
EnvironmentFile = [
cfg.secretFile
cfg.sharedSecretFile
];
Environment = [
"DRONE_DATABASE_DATASOURCE=postgres:///drone?host=/run/postgresql"
"DRONE_SERVER_HOST=drone.${config.networking.domain}"
"DRONE_SERVER_PROTO=https"
"DRONE_DATABASE_DRIVER=postgres"
"DRONE_SERVER_PORT=:${toString cfg.port}"
"DRONE_USER_CREATE=username:${cfg.admin},admin:true"
"DRONE_JSONNET_ENABLED=true"
"DRONE_STARLARK_ENABLED=true"
];
ExecStart = "${pkgs.drone}/bin/drone-server";
User = "drone";
Group = "drone";
};
};
users.users.drone = {
isSystemUser = true;
createHome = true;
group = "drone";
};
users.groups.drone = { };
services.postgresql = {
enable = true;
ensureDatabases = [ "drone" ];
ensureUsers = [{
name = "drone";
ensurePermissions = {
"DATABASE drone" = "ALL PRIVILEGES";
};
}];
};
my.services.nginx.virtualHosts = [
{
subdomain = "drone";
inherit (cfg) port;
}
];
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# Docker runner
systemd.services.drone-runner-docker = lib.mkIf (hasRunner "docker") {
wantedBy = [ "multi-user.target" ];
after = [ "docker.socket" ]; # Needs the socket to be available
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# might break deployment
restartIfChanged = false;
confinement.enable = true;
serviceConfig = {
Environment = [
"DRONE_SERVER_HOST=drone.${config.networking.domain}"
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"DRONE_SERVER_PROTO=https"
"DRONE_RUNNER_CAPACITY=10"
"CLIENT_DRONE_RPC_HOST=127.0.0.1:${toString cfg.port}"
];
BindPaths = [
"/var/run/docker.sock"
];
EnvironmentFile = [
cfg.sharedSecretFile
];
ExecStart = "${dockerPkg}/bin/drone-runner-docker";
User = "drone-runner-docker";
Group = "drone-runner-docker";
};
};
# Make sure it is activated in that case
virtualisation.docker.enable = lib.mkIf (hasRunner "docker") true;
users.users.drone-runner-docker = lib.mkIf (hasRunner "docker") {
isSystemUser = true;
group = "drone-runner-docker";
extraGroups = [ "docker" ]; # Give access to the daemon
};
users.groups.drone-runner-docker = lib.mkIf (hasRunner "docker") { };
# Exec runner
systemd.services.drone-runner-exec = lib.mkIf (hasRunner "exec") {
wantedBy = [ "multi-user.target" ];
# might break deployment
restartIfChanged = false;
confinement.enable = true;
confinement.packages = with pkgs; [
git
gnutar
bash
nixUnstable
gzip
];
path = with pkgs; [
git
gnutar
bash
nixUnstable
gzip
];
serviceConfig = {
Environment = [
"DRONE_SERVER_HOST=drone.${config.networking.domain}"
"DRONE_SERVER_PROTO=https"
"DRONE_RUNNER_CAPACITY=10"
"CLIENT_DRONE_RPC_HOST=127.0.0.1:${toString cfg.port}"
"NIX_REMOTE=daemon"
"PAGER=cat"
];
BindPaths = [
"/nix/var/nix/daemon-socket/socket"
"/run/nscd/socket"
];
BindReadOnlyPaths = [
"/etc/resolv.conf:/etc/resolv.conf"
"/etc/resolvconf.conf:/etc/resolvconf.conf"
"/etc/passwd:/etc/passwd"
"/etc/group:/etc/group"
"/nix/var/nix/profiles/system/etc/nix:/etc/nix"
"${config.environment.etc."ssl/certs/ca-certificates.crt".source}:/etc/ssl/certs/ca-certificates.crt"
"${config.environment.etc."ssh/ssh_known_hosts".source}:/etc/ssh/ssh_known_hosts"
"/etc/machine-id"
# channels are dynamic paths in the nix store, therefore we need to bind mount the whole thing
"/nix/"
];
EnvironmentFile = [
cfg.sharedSecretFile
];
ExecStart = "${execPkg}/bin/drone-runner-exec";
User = "drone-runner-exec";
Group = "drone-runner-exec";
};
};
users.users.drone-runner-exec = lib.mkIf (hasRunner "exec") {
isSystemUser = true;
group = "drone-runner-exec";
};
users.groups.drone-runner-exec = lib.mkIf (hasRunner "exec") { };
};
}