2f05e2db28
Seven host oneshots fetch a secret from the swarm secret store into a file their consumer loads at start: swarm-bao-grafana-oidc, swarm-bao-otel-oidc, swarm-bao-matrix-oidc, swarm-bao-ci-runner, swarm-bao-forge-oidc, swarm-bao-hive-otel-oidc and swarm-bao-forwarder-oidc. Each was RemainAfterExit with no timer, so it ran at boot or deploy and never again: a secret re-minted in the store reached its consumer only through an operator restarting the fetch. lib/store-refresh-timer.nix gives each one a timer (OnUnitInactiveSec 10min, RandomizedDelaySec 1min, the agent's own store re-read interval), and each drops RemainAfterExit so a timer start is not a no-op. Each script already writes the file only when secret_differs, and refresh_consumer/refresh_unit restart the consumer only when the file is newer than its last start, so a run reading an unchanged value restarts nothing. Two docs said these units do not run on a timer; credentials.md's ci-runner row said the runner token is not re-pulled. Part of #5017 (slice T).
520 lines
22 KiB
Nix
520 lines
22 KiB
Nix
# The swarm's Forgejo Actions runner, in a `swarm-ci-runner` container on the
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# host that sets `deploy.ci-runner.enable`. It reaches the forge by name and
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# reads its registration token from the secret store under a certificate of
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# its own, so nothing here asks whether this host runs the forge or a hive.
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#
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# ⚠️ Two properties here are load-bearing and neither is visible from the
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# config that implements it:
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#
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# - The container gets its OWN network namespace, not the host's, so a PR's
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# nix build cannot reach host-loopback services. That is a
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# prompt-injection boundary; moving this to host netns for convenience
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# removes it. `docs/networking/network.md::Container isolation`.
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# - The forge ADMIN token never enters this container. swarm-controller holds
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# it and publishes only the registration token, which the runner's own store
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# identity reads. `docs/scheduler/ci.md::Registration`.
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#
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# Non-ephemeral on purpose: the runner writes its registered credentials
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# (`.runner`) to its state dir and reuses them, so an ephemeral container
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# would register a new runner on every restart.
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{
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pkgs,
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lib,
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config,
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...
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}:
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let
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cfg = config.services.hyperhive.deploy.ci-runner;
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forgeCfg = config.services.hyperhive.swarm.forge;
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baoCfg = config.services.hyperhive.swarm.bao;
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baoDeploy = config.services.hyperhive.deploy.bao;
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gatewayCfg = config.services.hyperhive.gateway;
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networkCfg = config.services.hyperhive.network;
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tlsCfg = config.services.hyperhive.deploy.hive-controller.tls;
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machine = "swarm-ci-runner";
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# The upstream module names its unit `gitea-runner-<instance>`.
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instance = "swarm";
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runnerUnit = "gitea-runner-${instance}";
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# Holds the registration token and registers; see its definition.
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registerUnit = "swarm-ci-runner-register";
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# What the runner registers against and records in `.runner`. The precond
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# below compares the two, so both come from here.
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forgeUrl = "https://${forgeCfg.domain}";
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# The forge's gateway serves a leaf from the store's `pki` mount in
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# self-signed mode.
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# The runner daemon is Go, whose `SSL_CERT_FILE` replaces the system store,
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# so it gets the assembled bundle; the Node actions it runs get
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# `NODE_EXTRA_CA_CERTS`, which is additive, further down.
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caTrust = import ./lib/hive-ca-trust.nix { inherit lib tlsCfg gatewayCfg; };
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caBundleModule = caTrust.trustBundle {
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inherit pkgs;
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name = machine;
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consumers = [
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runnerUnit
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registerUnit
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];
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};
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# The upstream unit is `DynamicUser`, so its state dir is
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# `/var/lib/private/gitea-runner`; `/var/lib/gitea-runner` is a symlink to
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# it, which is the spelling a step run as root (`+`) can follow.
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runnerFile = "/var/lib/gitea-runner/${instance}/.runner";
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# Inside the container, root-only. The token file holds the bare token and
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# is a `LoadCredential=` of the register unit alone; the host unit below
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# writes it through the container's root, at `hostTokenFile`.
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stateDir = "/var/lib/swarm-ci-runner";
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tokenFile = "${stateDir}/registration-token";
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tokenCredential = "registration-token";
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hostTokenFile = "/var/lib/nixos-containers/${machine}${tokenFile}";
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# The epoch second the daemon last started. The precond reads the daemon's
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# journal from there.
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daemonStartedFile = "${stateDir}/daemon-started";
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# The nix half of `swarm_secret_client::ci::registration_token_path`, in the
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# form `bao kv get` takes (no KV v2 `data/`).
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storePath = "secret/swarm/services/ci-runner/registration-token";
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# What Forgejo answers a runner it has no record of — deleted in the admin
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# panel, or a forge whose database was replaced — on every call but
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# `Register` (`routers/api/actions/runner/interceptor.go`). The daemon logs
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# it and exits 1 when its startup `Declare` gets it. ⚠️ Nothing this module
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# prints may contain it: the precond would read its own line as a rejection.
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rejectedMessage = "unregistered runner";
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haveClientIdentity =
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baoDeploy.ciRunnerClientCertFile != null && baoDeploy.ciRunnerClientKeyFile != null;
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atomicWriteSecret = import ./lib/atomic-write-secret.nix { };
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refreshConsumer = import ./lib/refresh-consumer.nix { };
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storeRetry = import ./lib/store-retry.nix { };
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storeRefreshTimer = import ./lib/store-refresh-timer.nix { };
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privateNetwork = true;
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in
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{
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options.services.hyperhive.deploy.ci-runner = {
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# `enable` is in ./deploy.nix.
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name = lib.mkOption {
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type = lib.types.str;
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default = "swarm-ci-runner";
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description = ''
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Runner name as shown in the Forgejo admin panel.
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'';
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};
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concurrency = lib.mkOption {
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type = lib.types.ints.positive;
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default = 1;
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example = 4;
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description = ''
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Maximum number of workflow jobs the runner executes in parallel.
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Each job gets its own temporary working directory; parallel jobs
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share the host's nix store and the container's cargo registry
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cache. Higher values trade memory and CPU headroom for throughput.
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'';
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};
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labels = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = [ "hive-ci:host" ];
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example = [
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"hive-ci:host"
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"nix:host"
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];
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description = ''
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Runner labels in `<name>:<scheme>` format. The `host` scheme runs
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commands directly in the container (no docker/podman). This repo's
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workflows target the default with `runs-on: hive-ci`.
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'';
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};
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package = lib.mkOption {
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type = lib.types.package;
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default = pkgs.gitea-actions-runner;
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defaultText = lib.literalExpression "pkgs.gitea-actions-runner";
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description = "gitea-actions-runner package.";
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};
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jobTimeout = lib.mkOption {
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type = lib.types.str;
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default = "1h";
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example = "3h";
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description = ''
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Per-job wall-clock timeout the runner enforces (act_runner's
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`runner.timeout`). A job that exceeds it is killed, so a hung build
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does not hold a runner slot indefinitely. Accepts a Go duration
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string (`30m`, `1h`, `2h30m`). Enforced by the runner process, so
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it only fires while that process is healthy.
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'';
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};
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};
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config = lib.mkIf cfg.enable {
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assertions = [
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{
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assertion = haveClientIdentity;
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message = ''
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services.hyperhive.deploy.ci-runner.enable requires the runner's
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swarm-secret-store client identity: set both
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services.hyperhive.deploy.bao.ciRunnerClientCertFile
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services.hyperhive.deploy.bao.ciRunnerClientKeyFile
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swarm-bao-ci-runner.service reads the forge's runner registration
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token with it, and the runner cannot register without that token.
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Both default to the pair glue-bao-tls.nix mints when
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services.hyperhive.deploy.bao.enable is true (the host that runs
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the store). Otherwise copy ci-runner.pem and ci-runner-key.pem from
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the store host's /var/lib/swarm-bao-pki/ and name them in those two
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options.
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'';
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}
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];
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# The container hangs off the bridge, takes its address from the
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# gateway's DHCP and resolves through its dnsmasq. The gateway also runs
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# `hive-tls-ca`, which writes the trust bundle bound in below.
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services.hyperhive.network.enable = lib.mkDefault true;
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services.hyperhive.gateway.enable = lib.mkDefault true;
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services.hyperhive.gateway.dns.enable = lib.mkDefault true;
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# Shaped after ./swarm-grafana.nix's `swarm-bao-grafana-oidc`, except that
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# a missing token fails too: swarm-controller publishes it at its start and
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# every five minutes, so a retry is what turns "no value there" into one.
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systemd.services.swarm-bao-ci-runner = {
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description = "fetch the CI runner's registration token from the swarm secret store";
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after = lib.optionals baoDeploy.enable [
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"swarm-bao-pki.service"
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"container@${baoCfg.machine}.service"
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];
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wants = lib.optionals baoDeploy.enable [ "container@${baoCfg.machine}.service" ];
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requires = lib.optionals baoDeploy.enable [ "swarm-bao-pki.service" ];
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before = [ "container@${machine}.service" ];
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wantedBy = [
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"multi-user.target"
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"container@${machine}.service"
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];
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path = [
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baoDeploy.package
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pkgs.coreutils
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pkgs.systemd
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];
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inherit (storeRetry) startLimitBurst startLimitIntervalSec;
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serviceConfig = storeRetry.serviceConfig // {
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# No `RemainAfterExit`: the timer below starts this again, and
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# starting an active unit is a no-op.
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Type = "oneshot";
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SyslogIdentifier = "swarm-bao-ci-runner";
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TimeoutStartSec = 30;
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};
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environment = {
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BAO_ADDR = "https://${baoCfg.domain}:${toString baoCfg.port}";
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BAO_CLIENT_CERT = baoDeploy.ciRunnerClientCertFile;
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BAO_CLIENT_KEY = baoDeploy.ciRunnerClientKeyFile;
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}
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// lib.optionalAttrs (baoDeploy.serverCaFile != null) {
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BAO_CACERT = baoDeploy.serverCaFile;
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};
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script = ''
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set -euo pipefail
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${atomicWriteSecret}
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${refreshConsumer}
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err="$(mktemp)"
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trap 'rm -f "$err"' EXIT
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# `-token-only` answers on stdout and needs no token helper.
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if ! BAO_TOKEN="$(bao login -method=cert -token-only 2>"$err")"; then
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echo "could not log in to swarm-bao with the CI runner's certificate; leaving its registration token as it is." >&2
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if [ -s "$err" ]; then
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cat "$err" >&2
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else
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echo "bao failed without writing a diagnostic." >&2
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fi
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exit 1
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fi
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export BAO_TOKEN
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if ! token="$(bao kv get -field=value ${lib.escapeShellArg storePath} 2>"$err")"; then
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echo "swarm-bao did not return ${storePath}; retrying until swarm-controller publishes it." >&2
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if [ -s "$err" ]; then
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cat "$err" >&2
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else
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echo "bao failed without writing a diagnostic." >&2
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fi
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exit 1
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fi
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if [ -z "$token" ]; then
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echo "swarm-bao returned an empty ${storePath}; retrying." >&2
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exit 1
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fi
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# Root-owned: systemd reads a `LoadCredential=` source as root, before
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# the runner drops to its dynamic user.
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install -d -m 0700 ${lib.escapeShellArg (builtins.dirOf hostTokenFile)}
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if secret_differs ${lib.escapeShellArg hostTokenFile} "$token"; then
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atomic_write_secret 0600 "" ${lib.escapeShellArg hostTokenFile} "$token"
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fi
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# `LoadCredential=` copies the file at start, so a runner still waiting
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# to register sees a new token only once it restarts.
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refresh_consumer ${lib.escapeShellArg machine} ${runnerUnit}.service ${lib.escapeShellArg hostTokenFile}
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'';
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};
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systemd.timers.swarm-bao-ci-runner = storeRefreshTimer "re-read the CI runner's registration token from the swarm secret store";
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systemd.services."container@${machine}" = caTrust.containerOrdering;
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containers.${machine} = {
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autoStart = true;
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ephemeral = false;
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# Journal files on the host, not inside the container: nixpkgs hardcodes
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# --link-journal=try-guest, and EXTRA_NSPAWN_FLAGS expands after it.
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extraFlags = [ "--link-journal=host" ];
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inherit privateNetwork;
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hostBridge = networkCfg.bridgeName;
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bindMounts = {
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# Builds go through the HOST nix-daemon, so they inherit its
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# buildMachines and max-jobs. The directory rather than the socket
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# file, so the mount survives a daemon restart replacing the inode.
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"/nix/var/nix/daemon-socket" = {
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hostPath = "/nix/var/nix/daemon-socket";
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isReadOnly = false;
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};
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}
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// caTrust.bindMount;
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config =
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{
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pkgs,
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lib,
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config,
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...
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}:
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let
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runnerCfg = config.services.gitea-actions-runner;
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instanceCfg = runnerCfg.instances.${instance};
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# The same file upstream generates and hands the daemon.
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runnerConfigFile = (pkgs.formats.yaml { }).generate "config.yaml" instanceCfg.settings;
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# In the form the daemon rewrites `.runner`'s labels to on start
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# (act_runner's `labels.Parse` then `ToStrings`): `<name>:<scheme>`
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# with `host` for a missing scheme, then `:<arg>` if there is one.
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normaliseLabel =
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label:
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let
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parts = lib.splitString ":" label;
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scheme = if lib.length parts >= 2 then lib.elemAt parts 1 else "host";
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arg = lib.concatStringsSep ":" (lib.drop 2 parts);
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in
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"${lib.head parts}:${scheme}" + lib.optionalString (arg != "") ":${arg}";
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registeredLabels = lib.concatStringsSep "," (
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lib.sort lib.lessThan (map normaliseLabel instanceCfg.labels)
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);
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in
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{
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imports = [
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../container-modules/swarm-container.nix
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caBundleModule
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];
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# Its own netns, so it keeps its own firewall; resolvconf stays on
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# and serves `networking.nameservers` below.
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services.hyperhive.swarmContainer = {
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inherit privateNetwork;
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writesOwnResolvConf = false;
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};
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# The gateway's dnsmasq on the bridge answers the forge's name with
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# the bridge IP where this host runs the forge, and forwards it
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# upstream everywhere else.
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networking.nameservers = [ networkCfg.bridgeIp ];
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networking.interfaces.eth0.useDHCP = true;
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# nspawn containers can't create user namespaces, so nix sandboxing
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# fails; see docs/process/gotchas.md. `fallback` is a client-side
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# option sent per daemon connection, so the host's value does not
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# reach builds started here.
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nix.settings.sandbox-fallback = lib.mkForce true;
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nix.settings.fallback = true;
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nix.settings.experimental-features = [
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"nix-command"
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"flakes"
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];
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# Both the service and its socket are off: the socket unit owns
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# `/nix/var/nix/daemon-socket/socket` and would race the bind mount.
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systemd.globalEnvironment.NIX_REMOTE = "daemon";
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systemd.services.nix-daemon.enable = false;
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systemd.sockets.nix-daemon.enable = false;
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systemd.tmpfiles.rules = [
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"d ${stateDir} 0700 root root -"
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# `LoadCredential=` fails the unit when the file is missing; an
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# empty one lets the register unit report the missing token.
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"f ${tokenFile} 0600 root root -"
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# Unused: nothing in this module writes or reads them. The first
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# holds a token; the others are upstream's re-registration markers.
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"r ${stateDir}/registration-token.env"
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"r /var/lib/private/gitea-runner/${instance}/.token-hash"
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"r /var/lib/private/gitea-runner/${instance}/.labels"
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];
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services.gitea-actions-runner.package = cfg.package;
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services.gitea-actions-runner.instances.${instance} = {
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enable = true;
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inherit (cfg) name labels;
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url = forgeUrl;
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# Upstream refuses an instance without a token source, and turns
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# this one into the `EnvironmentFile=` the daemon unit drops.
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inherit tokenFile;
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settings = {
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runner.capacity = cfg.concurrency;
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runner.timeout = cfg.jobTimeout;
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};
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};
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environment.systemPackages = [
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pkgs.git
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pkgs.nix
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];
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# The only unit that can read the registration token: systemd hands
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# a credential to every process of the unit that loads it, and the
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# daemon's processes include every host job. Leaves a usable
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# `.runner` behind or fails.
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#
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# The daemon's dynamic user and state dir: units naming the same
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# `DynamicUser` share its uid, so `.runner` is the daemon's own.
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systemd.services.${registerUnit} = {
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description = "register the CI runner with the forge when it has no .runner";
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wants = [ "network-online.target" ];
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after = [ "network-online.target" ];
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environment = {
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HOME = "/var/lib/gitea-runner/${instance}";
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# In the form the daemon rewrites `.runner`'s labels to.
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SWARM_CI_RUNNER_LABELS = registeredLabels;
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};
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serviceConfig = {
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Type = "oneshot";
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DynamicUser = true;
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User = "gitea-runner";
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StateDirectory = "gitea-runner";
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LoadCredential = [ "${tokenCredential}:${tokenFile}" ];
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# `register` retries an unreachable forge without end; under the
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# daemon's own start timeout, so the failure is this unit's.
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TimeoutStartSec = 60;
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# Removes `.runner` in the cases where reusing it would fail, so
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# the register step registers again.
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#
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# `+`: root, because the system journal is out of the dynamic
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# user's reach.
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ExecStartPre = "+${pkgs.writeShellScript "swarm-ci-runner-precond" ''
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set -eu
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runner=${runnerFile}
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started=${daemonStartedFile}
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# The forge refused the registration the daemon last started
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# with. Read on the next start rather than when the daemon
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# exits, so journald has its last lines by then.
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if [ -f "$started" ]; then
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since="$(< "$started")"
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${pkgs.coreutils}/bin/rm -f "$started"
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if ${pkgs.systemd}/bin/journalctl -u ${runnerUnit}.service --since "@$since" -o cat --no-pager \
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| ${pkgs.gnugrep}/bin/grep -qF ${lib.escapeShellArg rejectedMessage}; then
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echo "the forge has no record of this runner's registration; registering again" >&2
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${pkgs.coreutils}/bin/rm -f "$runner"
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fi
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fi
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# `.runner` records the address it registered at, and the
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# daemon dials that one, not the configured one.
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if [ -f "$runner" ] \
|
|
&& [ "$(${pkgs.jq}/bin/jq -r .address "$runner")" != ${lib.escapeShellArg forgeUrl} ]; then
|
|
echo "$runner names another forge address; registering again at ${forgeUrl}" >&2
|
|
${pkgs.coreutils}/bin/rm -f "$runner"
|
|
fi
|
|
|
|
# The daemon declares the labels `.runner` records, not the
|
|
# configured ones.
|
|
if [ -f "$runner" ] \
|
|
&& [ "$(${pkgs.jq}/bin/jq -r '.labels | sort | join(",")' "$runner")" != "$SWARM_CI_RUNNER_LABELS" ]; then
|
|
echo "$runner names other labels; registering again with $SWARM_CI_RUNNER_LABELS" >&2
|
|
${pkgs.coreutils}/bin/rm -f "$runner"
|
|
fi
|
|
''}";
|
|
};
|
|
script = ''
|
|
set -u
|
|
dir="$STATE_DIRECTORY/${instance}"
|
|
mkdir -p "$dir"
|
|
cd "$dir"
|
|
if [ -e .runner ]; then
|
|
exit 0
|
|
fi
|
|
|
|
token="$(< "$CREDENTIALS_DIRECTORY/${tokenCredential}")"
|
|
if [ -z "$token" ]; then
|
|
echo "no registration token yet; swarm-bao-ci-runner on the host delivers it" >&2
|
|
exit 1
|
|
fi
|
|
exec ${lib.getExe runnerCfg.package} register --no-interactive \
|
|
--instance ${lib.escapeShellArg instanceCfg.url} \
|
|
--token "$token" \
|
|
--name ${lib.escapeShellArg instanceCfg.name} \
|
|
--labels ${lib.escapeShellArg (lib.concatStringsSep "," instanceCfg.labels)} \
|
|
--config ${runnerConfigFile}
|
|
'';
|
|
};
|
|
|
|
systemd.services.${runnerUnit} = {
|
|
# `path` adds to the PATH the upstream module builds instead of
|
|
# replacing it.
|
|
path = [ pkgs.nix ];
|
|
# The upstream unit is `DynamicUser`, whose state dir systemd mounts
|
|
# `noexec`, so a job could not execute what it builds in its
|
|
# workspace. `ExecPaths=` resolves against the host root, where
|
|
# `/var/lib/gitea-runner` is a symlink into `private/`; `-` makes
|
|
# whichever spelling is absent a no-op.
|
|
serviceConfig.ExecPaths = [
|
|
"-/var/lib/gitea-runner"
|
|
"-/var/lib/private/gitea-runner"
|
|
];
|
|
environment = lib.mkIf caTrust.useSelfSigned {
|
|
NODE_EXTRA_CA_CERTS = caTrust.caContainerPath;
|
|
};
|
|
# A host job inherits the daemon's whole environment and can read
|
|
# its credentials, so the daemon carries the token in neither.
|
|
serviceConfig.EnvironmentFile = lib.mkForce [ ];
|
|
# Replaces upstream's pre-start step, which registers from
|
|
# `$TOKEN`, so the register unit is the one registration path.
|
|
#
|
|
# Started from here rather than through `Requires=`: a failed
|
|
# requirement fails the start job, which `Restart=` does not retry,
|
|
# while a failed pre-start step does.
|
|
serviceConfig.ExecStartPre = lib.mkForce [
|
|
"+${pkgs.systemd}/bin/systemctl start ${registerUnit}.service"
|
|
"+${pkgs.writeShellScript "swarm-ci-runner-mark-start" ''
|
|
${pkgs.coreutils}/bin/date +%s > ${daemonStartedFile}
|
|
''}"
|
|
];
|
|
# Restarted until the token arrives, however long the store and
|
|
# the controller take. `mkForce`: upstream sets both.
|
|
serviceConfig.Restart = lib.mkForce "on-failure";
|
|
serviceConfig.RestartSec = lib.mkForce 15;
|
|
startLimitIntervalSec = 0;
|
|
};
|
|
};
|
|
};
|
|
};
|
|
}
|