280 lines
12 KiB
Nix
280 lines
12 KiB
Nix
# The swarm builder, in a `swarm-builder` container on the host that sets
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# `deploy.builder.enable`, which `deploy.allSwarmServices` defaults on where the
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# host has the builder's store identity (./swarm-required-services.nix). It runs
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# unreviewed config PRs through the host's nix daemon. It builds agent configs
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# for swarm-controller: the controller sends a config PR's head over the
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# queue, and the daemon builds that config on this host's agent base and
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# replies.
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# docs/swarm/builder.md has the design.
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#
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# ⚠️ Its own network namespace on the bridge, as ./swarm-ci-runner.nix has: a
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# config PR is unreviewed input to a nix evaluation, so the container reaches
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# the swarm services by name and nothing on the host's loopback.
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#
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# Builds go through the HOST nix-daemon, as the CI runner's do. The daemon
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# runs as a dynamic user, an untrusted daemon client: a config can set no
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# daemon option, and its builds run in the host's sandbox.
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#
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# The container holds one credential, its own store leaf, which nspawn hands in
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# as a system credential with no copy on disk. The daemon reads everything else
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# from the store with it: its queue client secret at start and its forge token
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# on every build.
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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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hyperhiveCfg = config.services.hyperhive;
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cfg = hyperhiveCfg.deploy.builder;
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baoCfg = hyperhiveCfg.swarm.bao;
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baoDeploy = hyperhiveCfg.deploy.bao;
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natsCfg = hyperhiveCfg.swarm.nats;
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autheliaCfg = hyperhiveCfg.swarm.authelia;
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forgeCfg = hyperhiveCfg.swarm.forge;
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gatewayCfg = hyperhiveCfg.gateway;
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networkCfg = hyperhiveCfg.network;
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tlsCfg = hyperhiveCfg.deploy.hive-controller.tls;
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machine = "swarm-builder";
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unit = "swarm-builder";
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clientId = hyperhiveCfg.swarm.builder.clientId;
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# The container's journal forwarder pushes to its own receiver on the swarm
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# collector, the route `serviceProducers.swarm-builder` in
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# ./swarm-otel-service.nix declares, by the collector's gateway name. The
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# port suffix is elided on 443, as in ./swarm-bao.nix.
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swarmOtelCfg = hyperhiveCfg.swarm.otel;
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gatewayPortSuffix = lib.optionalString (
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gatewayCfg.httpsPort != 443
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) ":${toString gatewayCfg.httpsPort}";
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forwarderEndpoint = "https://${swarmOtelCfg.domain}${gatewayPortSuffix}/${machine}";
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forwarderUnit = "swarm-journal-forwarder-oidc";
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# Loopback in the container's own netns, and distinct from the other service
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# containers' forwarders all the same.
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forwarderTelemetryPort = 8892;
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# The daemon reaches authelia, the store and the queue by name over TLS, and
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# `git` reaches the forge; in self-signed mode their leaves chain to the hive
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# CA.
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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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unit
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# Go: `SSL_CERT_FILE` replaces its trust store, for the swarm
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# collector's and authelia's names.
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"opentelemetry-collector"
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];
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};
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haveClientIdentity =
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baoDeploy.builderClientCertFile != null && baoDeploy.builderClientKeyFile != null;
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# Credential id → host source, as ./swarm-review-classifier.nix hands its
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# leaf in.
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storeFiles = lib.filterAttrs (_: source: source != null) {
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builder-bao-cert = baoDeploy.builderClientCertFile;
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builder-bao-key = baoDeploy.builderClientKeyFile;
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builder-bao-server-ca = baoDeploy.serverCaFile;
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};
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# nixos-container expands `extraFlags` unquoted, so a source path must be
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# one word.
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oneWord = path: builtins.match ".*[[:space:]].*" path == null;
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credential = id: "/run/credentials/${unit}.service/${id}";
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forwarderCredential = id: "/run/credentials/${forwarderUnit}.service/${id}";
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# The `nix` the host daemon runs, so client and daemon speak one protocol.
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nix = config.nix.package;
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# Strings, not paths: both are already store paths.
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hyperhiveFlake = hyperhiveCfg.c0re.hyperhiveFlake;
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nixpkgsFlake = hyperhiveCfg.c0re.nixpkgsFlake;
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privateNetwork = true;
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in
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{
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options.services.hyperhive.swarm.builder.clientId = lib.mkOption {
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type = lib.types.str;
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readOnly = true;
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default = "swarm-builder";
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description = ''
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The OAuth2 client id the swarm builder presents to the swarm queue.
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Read-only: the host running authelia registers it, the queue's
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auth-callout responder grants it the build subject, and the secret
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publisher carries its secret to the store, all from this one value.
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'';
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};
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options.services.hyperhive.deploy.builder.package = lib.mkOption {
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type = lib.types.package;
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defaultText = lib.literalExpression "hyperhive.packages.\${system}.swarm-builder";
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description = "The swarm builder daemon package.";
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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.builder.enable requires the builder's
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swarm-secret-store client identity: set both
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services.hyperhive.deploy.bao.builderClientCertFile
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services.hyperhive.deploy.bao.builderClientKeyFile
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The builder reads its queue client secret and its forge token with it.
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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 the
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store). Otherwise copy builder.pem and builder-key.pem from the store
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host's /var/lib/swarm-bao-pki/ and name them in those two options.
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'';
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}
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{
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assertion = lib.all oneWord (lib.attrValues storeFiles);
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message = ''
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The swarm builder's store identity paths must not contain whitespace:
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nspawn's --load-credential receives them through nixos-container's
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unquoted extra flags.
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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 gateway's
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# DHCP and resolves through its dnsmasq.
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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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# nspawn fails to start the container when a credential source is
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# missing, so where this host mints the leaf the container pulls the
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# minting unit in and waits for it. Ordering alone is not enough: the
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# container starts from `machines.target`, outside the transaction that
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# runs the minting unit from `multi-user.target`. Ignored elsewhere, where
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# the unit does not exist.
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systemd.services."container@${machine}" = lib.mkMerge [
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caTrust.containerOrdering
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{
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after = [ "swarm-bao-pki.service" ];
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wants = [ "swarm-bao-pki.service" ];
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}
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];
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containers.${machine} = {
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autoStart = true;
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# The daemon keeps nothing but `git`'s fetch cache, which a restart may
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# drop.
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ephemeral = false;
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# No `--link-journal=host`: the journal stays in the guest, where the
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# container's own forwarder reads it (../container-modules/swarm-journal-forwarder.nix).
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extraFlags = lib.mapAttrsToList (id: source: "--load-credential=${id}:${source}") storeFiles;
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inherit privateNetwork;
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hostBridge = networkCfg.bridgeName;
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bindMounts = {
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# The directory rather than the socket file, so the mount survives a
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# 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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{ lib, ... }:
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{
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imports = [
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../container-modules/swarm-container.nix
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../container-modules/swarm-journal-forwarder.nix
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caBundleModule
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];
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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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networking.nameservers = [ networkCfg.bridgeIp ];
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networking.interfaces.eth0.useDHCP = true;
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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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# Authenticated as the daemon's own OIDC client, whose secret its
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# store identity already reads: one identity for the whole container.
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# That identity is a system credential, so the fetch unit loads it
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# too; the daemon's `LoadCredential` below is that unit's alone.
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services.hyperhive.swarmJournalForwarder = {
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enable = true;
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serviceName = "builder";
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endpoint = forwarderEndpoint;
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inherit clientId;
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tokenUrl = "${autheliaCfg.url}/api/oidc/token";
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telemetryPort = forwarderTelemetryPort;
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store = {
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package = baoDeploy.package;
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addr = "https://${baoCfg.domain}:${toString baoCfg.port}";
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secretPath = "secret/swarm/services/${clientId}/oidc/client";
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clientCertFile = forwarderCredential "builder-bao-cert";
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clientKeyFile = forwarderCredential "builder-bao-key";
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caFile =
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if storeFiles ? builder-bao-server-ca then forwarderCredential "builder-bao-server-ca" else null;
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};
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};
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systemd.services.${forwarderUnit}.serviceConfig.LoadCredential = lib.attrNames storeFiles;
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systemd.services.${unit} = {
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description = "build agent configs for swarm-controller";
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wantedBy = [ "multi-user.target" ];
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wants = [ "network-online.target" ];
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after = [ "network-online.target" ];
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# nix fetches the config repo with `git`.
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path = [ pkgs.git ];
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environment = {
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BAO_ADDR = "https://${baoCfg.domain}:${toString baoCfg.port}";
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BAO_CLIENT_CERT = credential "builder-bao-cert";
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BAO_CLIENT_KEY = credential "builder-bao-key";
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NIX_CONFIG = "experimental-features = nix-command flakes";
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# nix's fetch cache, under `CacheDirectory`; the dynamic user has
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# no home of its own.
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HOME = "/var/cache/${unit}";
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XDG_CACHE_HOME = "/var/cache/${unit}";
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SWARM_BUILDER_NATS_URL = "tls://${natsCfg.domain}:${toString natsCfg.port}";
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SWARM_BUILDER_OIDC_TOKEN_ENDPOINT = "${autheliaCfg.url}/api/oidc/token";
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SWARM_BUILDER_OIDC_CLIENT_ID = clientId;
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SWARM_BUILDER_NIX = "${nix}/bin/nix";
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SWARM_BUILDER_CHECK_FLAKE = "${../builder/check-flake}";
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SWARM_BUILDER_HYPERHIVE_FLAKE = hyperhiveFlake;
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SWARM_BUILDER_NIXPKGS_FLAKE = nixpkgsFlake;
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SWARM_BUILDER_FORGE_URL = "https://${forgeCfg.domain}";
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SWARM_BUILDER_CONFIG_ORG = "agent-configs";
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}
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// lib.optionalAttrs (storeFiles ? builder-bao-server-ca) {
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BAO_CACERT = credential "builder-bao-server-ca";
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}
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// lib.optionalAttrs caTrust.useSelfSigned {
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SWARM_BUILDER_OIDC_CA_FILE = caTrust.bundlePathFor machine;
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# `git`'s trust store, which the bundle's system CAs keep whole.
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GIT_SSL_CAINFO = caTrust.bundlePathFor machine;
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};
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serviceConfig = {
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ExecStart = "${cfg.package}/bin/swarm-builder";
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DynamicUser = true;
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CacheDirectory = unit;
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# Bare ids: the system credentials nspawn handed in.
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LoadCredential = lib.attrNames storeFiles;
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Restart = "on-failure";
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RestartSec = "10s";
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SyslogIdentifier = unit;
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};
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};
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};
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};
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};
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}
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