nix: gate hive-c0re on deploy.hive-controller.enable, drop hyperhive.enable

`services.hyperhive.enable` and `services.hyperhive.c0re.enable` are gone.
One switch, `services.hyperhive.deploy.hive-controller.enable` (default
false, as the old toggle was), now gates hive-c0re and hive-priv. Both old
paths are `mkRenamedOptionModule` shims in deploy.nix, so a host config
that still sets either evaluates as before and gets a rename warning.

Every other read of the old toggle is resolved, including the 29 made
through the `hyperhiveCfg`/`hiveCfg` aliases:

- Dropped: each swarm service and its glue keeps only its own deploy
  toggle (authelia, bao and its PKI glue, grafana, victorialogs,
  victoriametrics, the secret publisher, swarm-ca, the OIDC client rows,
  the controller/nats/matrix-ctl/publisher/services-issuer identities),
  the forge, and the `domain` deprecation warning.
- To deploy.hive-controller.enable: the queue-agent credential reader and
  its assertion, which feed hive-c0re and write under its state dir, plus
  their policy-order entry; the network identity assertions; hive-tls's
  two writes into hive-c0re's environment.
- hive-tls runs where the gateway runs self-signed
  (`gateway.enable && useSelfSigned`), not on every host.
- The matrix appservice-token reader and its assertion stay on
  `deploy.matrix.enable` plus their client-identity checks. They read
  deploy.matrix's token file and registration script; their deploy.bao
  inputs are the client-half options a hive sets to read a store it does
  not run, so gating on deploy.bao.enable would drop the tested
  remote-reader case.
- The `hiveName` assertion moves from hive-network.nix to hyperhive.nix
  and fires wherever the hive, the store or the homeserver runs: each
  turns the name into an identifier with no fallback.

On a host with `deploy.allSwarmServices` and no hive, the documented
services-host recipe, authelia, bao, grafana, victorialogs,
victoriametrics, the OIDC client rows and the hive CA now render; before,
the old toggle being off left them out.

Refs #4500

README.md

@@ -77,7 +77,7 @@ Minimal `flake.nix` for a host that runs hive-c0re:
       modules = [
         hyperhive.nixosModules.default  # hive-c0re + hive-forge + hive-gateway in one import
         ({ ... }: {
-          services.hyperhive.enable = true;
+          services.hyperhive.deploy.hive-controller.enable = true;
           # services.hyperhive.c0re.operatorPronouns = "they/them";  # default: "she/her"
 
           # ... rest of your host config

docs/networking/network.md

@@ -90,7 +90,7 @@ listener on `bridgeIp` is on the host's bridge interface.
 ```nix
 {
   services.hyperhive = {
-    enable = true;
+    deploy.hive-controller.enable = true;
     hiveName = "pr1ma";
     swarm.domain = "darkest.space";
     swarm.hives.pr1ma = { };          # -> domain = pr1ma.darkest.space

docs/networking/snapshot-store.md

@@ -38,7 +38,7 @@ The store host is a swarm member like any other: it gets an entry in
 [swarm/](../swarm/README.md) for the mesh itself.
 
 Note that `deploy.wireguard.enable` gates the mesh, **not**
-`c0re.enable` --- a store host runs no hive and would otherwise get no
+`deploy.hive-controller.enable` --- a store host runs no hive and would otherwise get no
 `wg-hive` interface at all.
 
 ## Pointing a hive at it

docs/swarm/README.md

@@ -299,9 +299,9 @@ migrating agent keeps one unbroken incremental chain. See
 
 `services.hyperhive.deploy.swarm-controller.enable` runs the `swarm-controller`
 daemon on this host. **Off by default and deliberately not derived from
-`services.hyperhive.enable`**: a swarm has one controller, so enabling it
+`services.hyperhive.deploy.hive-controller.enable`**: a swarm has one
-is a statement about swarm topology, not about whether the operator has
+controller, so enabling it states a fact about swarm topology, not about
-installed hyperhive. Every hive runs `hive-c0re` (the agents on that host); one
+whether this host runs a hive. Every hive runs `hive-c0re` (the agents on that host); one
 hive additionally runs this (what's true across hives).
 
 What it serves, why it's a unix socket rather than a port, and the

flake.nix

@@ -119,7 +119,7 @@
           # an operator override still wins. Intended usage:
           #
           #   imports = [ hyperhive.nixosModules.default ];
-          #   services.hyperhive.enable = true;
+          #   services.hyperhive.deploy.hive-controller.enable = true;
           #
           default =
             { lib, pkgs, ... }:

nix/docs/default.nix

@@ -54,7 +54,7 @@ let
           };
           boot.loader.grub.enable = false;
           system.stateVersion = "25.11";
-          services.hyperhive.enable = lib.mkForce false;
+          services.hyperhive.deploy.hive-controller.enable = lib.mkForce false;
           services.hyperhive.deploy.matrix.enable = lib.mkForce false;
         }
       )

nix/host-modules/default.nix

@@ -1,7 +1,8 @@
 # The full hyperhive host stack, pulled together in one place — this
 # is what the flake exports as `nixosModules.default` (wrapped with
 # the package/source wiring; see flake.nix). One import covers
-# everything; `services.hyperhive.enable = true` turns the stack on.
+# everything; `services.hyperhive.deploy.hive-controller.enable = true`
+# runs a hive on this host.
 #
 # Every swarm needs the forge — hive-c0re mirrors every agent's applied
 # config repo into it and it's the canonical store for the meta flake
@@ -9,7 +10,7 @@
 # runs it (derived from `deploy.allSwarmServices`, see
 # ./swarm-required-services.nix). hive-matrix is opt-in (off by default). All
 # subsystems rely on `services.hyperhive.domain`, which is required
-# (asserted in hive-network.nix) whenever hyperhive is enabled.
+# (asserted in hive-network.nix) wherever this host runs a hive.
 {
   imports = [
     ./hyperhive.nix

nix/host-modules/deploy.nix

@@ -119,6 +119,15 @@ in
       [ "services" "hyperhive" "swarm" "statusPublish" "clientSecretFile" ]
       [ "services" "hyperhive" "deploy" "hive-controller" "statusPublish" "clientSecretFile" ]
     )
+    # Both old spellings of "run a hive here" forward to the one switch.
+    (lib.mkRenamedOptionModule
+      [ "services" "hyperhive" "enable" ]
+      [ "services" "hyperhive" "deploy" "hive-controller" "enable" ]
+    )
+    (lib.mkRenamedOptionModule
+      [ "services" "hyperhive" "c0re" "enable" ]
+      [ "services" "hyperhive" "deploy" "hive-controller" "enable" ]
+    )
     (lib.mkRenamedOptionModule
       [ "services" "hyperhive" "swarm" "otel" "enable" ]
       [ "services" "hyperhive" "deploy" "swarm-otel" "enable" ]
@@ -452,9 +461,9 @@ in
         Run the swarm's metrics UI on this host.
 
         Off by default and not derived from
-        {option}`services.hyperhive.enable`: a swarm has one Grafana, so
+        {option}`services.hyperhive.deploy.hive-controller.enable`: a swarm
-        running it is a decision about this host rather than about
+        has one Grafana, so running it is a decision about this host rather
-        whether hyperhive is installed.
+        than about whether it runs a hive.
       '';
     };
 
@@ -570,6 +579,21 @@ in
       '';
     };
 
+    hive-controller.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = ''
+        Run a hive on this host: the `hive-c0re` coordinator that owns every
+        agent container here, its `hive-priv` helper, and the bridge,
+        resolver and gateway the agents hang off.
+
+        Every hive turns this on. A host that only runs the swarm's shared
+        services ({option}`services.hyperhive.deploy.allSwarmServices`)
+        leaves it off.
+      '';
+    };
+
     swarm-controller.enable = lib.mkOption {
       type = lib.types.bool;
       default = false;
@@ -577,9 +601,9 @@ in
         Run the swarm-controller daemon on this host.
 
         Off by default and deliberately not derived from
-        {option}`services.hyperhive.enable`: a swarm has one controller,
+        {option}`services.hyperhive.deploy.hive-controller.enable`: a swarm
-        so running it is a decision about this host rather than about
+        has one controller, so running it is a decision about this host
-        whether hyperhive is installed.
+        rather than about whether it runs a hive.
       '';
     };
 

nix/host-modules/glue-bao-readers-policy-order.nix

@@ -31,22 +31,21 @@ let
   readersHere = {
     # ./glue-matrix-bao-token.nix
     swarm-bao-matrix-token =
-      hyperhiveCfg.enable
+      havePair baoDeploy.matrixTokenClientCertFile baoDeploy.matrixTokenClientKeyFile
-      && havePair baoDeploy.matrixTokenClientCertFile baoDeploy.matrixTokenClientKeyFile
       && deployCfg.matrix.enable;
     # ./glue-queue-agent-credential.nix
     swarm-bao-queue-agent =
-      hyperhiveCfg.enable
+      deployCfg.hive-controller.enable
       && havePair baoDeploy.queueAgentClientCertFile baoDeploy.queueAgentClientKeyFile;
     # ./swarm-grafana.nix
-    swarm-bao-grafana-oidc = hyperhiveCfg.enable && deployCfg.grafana.enable;
+    swarm-bao-grafana-oidc = deployCfg.grafana.enable;
     # ./swarm-otel.nix
     swarm-bao-otel-oidc =
       deployCfg.swarm-otel.enable
       && havePair baoDeploy.otelOidcClientCertFile baoDeploy.otelOidcClientKeyFile;
     # ./swarm-bao.nix: its block is gated on the store, which `orderAfterPolicy`
     # already checks.
-    swarm-bao-forwarder-oidc = hyperhiveCfg.enable;
+    swarm-bao-forwarder-oidc = true;
     # ./swarm-nats.nix: the queue's TLS leaf, not a secret, but the same wait.
     swarm-bao-nats-tls = deployCfg.nats.enable;
   };

nix/host-modules/glue-bao-tls.nix

@@ -43,9 +43,10 @@ let
 
   # What a reader calls itself to the store. The hive's name, because a bao
   # cert-auth role matches on the CN — this is an interface, not a label.
-  # No fallback: `hiveName` is asserted set for every hyperhive host, which is
+  # No fallback: `hiveName` is asserted set wherever `deploy.bao.enable` is
-  # the same condition this file's `config` is gated on. A fallback here reads
+  # (./hyperhive.nix), the same condition this file's `config` is gated on. A
-  # as a second supported spelling and there is no such thing.
+  # fallback here reads as a second supported spelling and there is no such
+  # thing.
   clientCn = hyperhiveCfg.hiveName;
 
   # $1 dir  $2 basename  $3 CN  $4 SAN or ""  $5 EKU
@@ -71,7 +72,7 @@ let
   '';
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.bao.enable) {
+  config = lib.mkIf deployCfg.bao.enable {
     services.hyperhive.deploy.bao = {
       serverCertFile = lib.mkDefault "${pkiDir}/server.pem";
       serverKeyFile = lib.mkDefault "${pkiDir}/server-key.pem";

nix/host-modules/glue-controller-bao-identity.nix

@@ -32,7 +32,7 @@ let
   pkiDir = if haveMintedPki then builtins.dirOf baoDeploy.clientCertFile else null;
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.swarm-controller.enable && haveMintedPki) {
+  config = lib.mkIf (deployCfg.swarm-controller.enable && haveMintedPki) {
     services.hyperhive.deploy.swarm-controller = {
       baoClientCertFile = lib.mkDefault "${pkiDir}/controller.pem";
       baoClientKeyFile = lib.mkDefault "${pkiDir}/controller-key.pem";

nix/host-modules/glue-forge-oidc-client.nix

@@ -24,7 +24,7 @@ let
   forgeCfg = hyperhiveCfg.swarm.forge;
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.authelia.enable) {
+  config = lib.mkIf deployCfg.authelia.enable {
     # One declaration, two readers. The forge knows its own callback URL;
     # making the operator restate it in authelia's client list would be a
     # second source of truth for a string whose mismatch is a silent

nix/host-modules/glue-grafana-oidc-client.nix

@@ -32,7 +32,7 @@ let
   grafanaCfg = hyperhiveCfg.swarm.grafana;
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.authelia.enable) {
+  config = lib.mkIf deployCfg.authelia.enable {
     # One declaration, two readers. Grafana's callback URL is format-locked to
     # its own root URL, and the read-only option it is taken from is where that
     # format is spelled — restating it here would be a second source of truth

nix/host-modules/glue-matrix-bao-token.nix

@@ -69,7 +69,8 @@ let
   # pieces; this literal is the nix half of that one agreement.
   #
   # `hiveName` has no fallback here for the reason ./glue-bao-tls.nix gives at
-  # its own use of it: it is asserted set for every hyperhive host.
+  # its own use of it: it is asserted set on every host that runs the
+  # homeserver.
   tokenPath = "secret/swarm/hives/${hyperhiveCfg.hiveName}/matrix/appservice-token";
 
   # A literal, not an option — ./hive-matrix.nix names its container
@@ -94,7 +95,7 @@ in
     # is a hive that has no store, which is supported. So this one additionally
     # requires `hiveReaderIdentity`: the host demonstrably reads the store, and
     # named every option but this pair.
-    (lib.mkIf (hyperhiveCfg.enable && deployCfg.matrix.enable && hiveReaderIdentity) {
+    (lib.mkIf (deployCfg.matrix.enable && hiveReaderIdentity) {
       assertions = [
         {
           assertion = haveClientIdentity;
@@ -124,7 +125,7 @@ in
       ];
     })
 
-    (lib.mkIf (hyperhiveCfg.enable && haveClientIdentity && deployCfg.matrix.enable) {
+    (lib.mkIf (haveClientIdentity && deployCfg.matrix.enable) {
       # Same rule as the unit's own gate: this reader exists on a host that has a
       # client identity and a homeserver, which is not every host that runs the
       # store, so the store's module cannot name it.

nix/host-modules/glue-matrix-ctl-bao-identity.nix

@@ -31,7 +31,7 @@ let
   pkiDir = if haveMintedPki then builtins.dirOf baoDeploy.clientCertFile else null;
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.matrix.enable && haveMintedPki) {
+  config = lib.mkIf (deployCfg.matrix.enable && haveMintedPki) {
     services.hyperhive.deploy.matrix = {
       ctlBaoClientCertFile = lib.mkDefault "${pkiDir}/matrix-ctl.pem";
       ctlBaoClientKeyFile = lib.mkDefault "${pkiDir}/matrix-ctl-key.pem";

nix/host-modules/glue-nats-bao-identity.nix

@@ -31,7 +31,7 @@ let
   pkiDir = if haveMintedPki then builtins.dirOf baoDeploy.clientCertFile else null;
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.nats.enable && haveMintedPki) {
+  config = lib.mkIf (deployCfg.nats.enable && haveMintedPki) {
     services.hyperhive.deploy.nats = {
       baoClientCertFile = lib.mkDefault "${pkiDir}/nats.pem";
       baoClientKeyFile = lib.mkDefault "${pkiDir}/nats-key.pem";

nix/host-modules/glue-queue-agent-credential.nix

@@ -20,10 +20,10 @@
 # into one that is refused, which reaches the agent as a timeout.
 #
 # 📌 This runs wherever a client identity is configured, NOT only where the
-# store is — the rule ./glue-matrix-bao-token.nix states in full. There is no
+# store is — the rule ./glue-matrix-bao-token.nix states in full — and
-# "this hive runs agents" condition to gate it on as well: agent containers
+# wherever this host runs a hive (`deploy.hive-controller.enable`): the
-# are created at runtime by hive-c0re, so every hyperhive host is a host that
+# credential is for the agents hive-c0re creates here at runtime, and the unit
-# may run one.
+# writes under hive-c0re's own state directory.
 {
   pkgs,
   lib,
@@ -74,7 +74,8 @@ let
   # one agreement.
   #
   # `hiveName` has no fallback here for the reason ./glue-bao-tls.nix gives at
-  # its own use of it: it is asserted set for every hyperhive host.
+  # its own use of it: it is asserted set wherever
+  # `deploy.hive-controller.enable` is.
   credentialPath = "secret/swarm/hives/${hyperhiveCfg.hiveName}/queue/agent";
 in
 {
@@ -110,11 +111,11 @@ in
     #
     # Shaped after ./swarm-grafana.nix's `haveClientIdentity` assertion — the
     # same refusal, named to this principal's own pair. Where Grafana's gate
-    # is `deploy.grafana.enable`, this reader has no toggle of its own to
+    # is `deploy.grafana.enable`, this reader's is the hive's own: every hive
-    # check: every hive runs one for its own agents, so reading the store at
+    # runs one for its own agents, so on a hive, reading the store at all is
-    # all is what asks for it. Hence `hiveReaderIdentity` alone — a host
+    # what asks for it. Hence `hiveReaderIdentity` — a host holding no hive
-    # holding no hive leaf has no store to read and nothing is missing.
+    # leaf has no store to read and nothing is missing.
-    (lib.mkIf (hyperhiveCfg.enable && hiveReaderIdentity) {
+    (lib.mkIf (deployCfg.hive-controller.enable && hiveReaderIdentity) {
       assertions = [
         {
           assertion = haveClientIdentity;
@@ -149,7 +150,7 @@ in
       ];
     })
 
-    (lib.mkIf (hyperhiveCfg.enable && haveClientIdentity) {
+    (lib.mkIf (deployCfg.hive-controller.enable && haveClientIdentity) {
       # Same rule as the unit's own gate: this reader exists on any host holding
       # a client identity, which is not every host that runs the store, so the
       # store's module cannot name it.

nix/host-modules/glue-secret-publisher-bao-identity.nix

@@ -31,12 +31,10 @@ let
   pkiDir = if haveMintedPki then builtins.dirOf baoDeploy.clientCertFile else null;
 in
 {
-  config =
+  config = lib.mkIf (deployCfg.swarm-secret-publisher.enable && haveMintedPki) {
-    lib.mkIf (hyperhiveCfg.enable && deployCfg.swarm-secret-publisher.enable && haveMintedPki)
+    services.hyperhive.deploy.swarm-secret-publisher = {
-      {
+      baoClientCertFile = lib.mkDefault "${pkiDir}/secret-publisher.pem";
-        services.hyperhive.deploy.swarm-secret-publisher = {
+      baoClientKeyFile = lib.mkDefault "${pkiDir}/secret-publisher-key.pem";
-          baoClientCertFile = lib.mkDefault "${pkiDir}/secret-publisher.pem";
+    };
-          baoClientKeyFile = lib.mkDefault "${pkiDir}/secret-publisher-key.pem";
+  };
-        };
-      };
 }

nix/host-modules/glue-services-issuer-bao-identity.nix

@@ -34,7 +34,7 @@ let
   pkiDir = if haveMintedPki then builtins.dirOf baoDeploy.clientCertFile else null;
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && haveMintedPki) {
+  config = lib.mkIf haveMintedPki {
     services.hyperhive.deploy.hive-controller.tls = {
       baoClientCertFile = lib.mkDefault "${pkiDir}/services-issuer.pem";
       baoClientKeyFile = lib.mkDefault "${pkiDir}/services-issuer-key.pem";

nix/host-modules/glue-swarm-bao-otel-oidc-client.nix

@@ -29,7 +29,7 @@ let
   baoCfg = hyperhiveCfg.swarm.bao;
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.authelia.enable) {
+  config = lib.mkIf deployCfg.authelia.enable {
     # One declaration, two readers: `clientId` is a read-only option
     # ./swarm-bao.nix owns, and ./swarm-otel.nix builds this principal's
     # authenticator audience from the same option.

nix/host-modules/glue-swarm-otel-oidc-client.nix

@@ -32,7 +32,7 @@ let
   otelCfg = hyperhiveCfg.swarm.otel;
 in
 {
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.authelia.enable) {
+  config = lib.mkIf deployCfg.authelia.enable {
     # One declaration, two readers: `clientId` and `audience` are read-only
     # options ./swarm-otel.nix derives from the scrape/push targets it owns,
     # so this file states neither formula a second time.

nix/host-modules/hive-c0re/default.nix

@@ -153,11 +153,11 @@ in
       name = "hive-c0re";
       consumers = [ "hive-c0re" ];
       hostUnit = true;
-      enable = cfg.enable;
+      enable = config.services.hyperhive.deploy.hive-controller.enable;
     })
   ];
 
-  config = lib.mkIf cfg.enable {
+  config = lib.mkIf config.services.hyperhive.deploy.hive-controller.enable {
     # This module is the host's only knowledge that agent containers
     # exist: they hang off the bridge, resolve through dnsmasq, and their
     # UIs — plus the operator dashboard — are served by the gateway.

nix/host-modules/hive-c0re/options.nix

@@ -7,17 +7,10 @@
 {
   pkgs,
   lib,
-  config,
   ...
 }:
 {
   options.services.hyperhive.c0re = {
-    enable = lib.mkOption {
-      type = lib.types.bool;
-      default = config.services.hyperhive.enable;
-      defaultText = lib.literalExpression "config.services.hyperhive.enable";
-      description = "Enable hive-c0re coordinator daemon (auto-enabled by services.hyperhive.enable).";
-    };
     package = lib.mkOption {
       type = lib.types.package;
       defaultText = lib.literalExpression "hyperhive.packages.\${system}.default";

nix/host-modules/hive-forge/default.nix

@@ -459,7 +459,7 @@ in
     };
   };
 
-  config = lib.mkIf (config.services.hyperhive.enable && deployCfg.forgejo.enable) {
+  config = lib.mkIf deployCfg.forgejo.enable {
     # Same principle as the vhost below — this service's own surface lives
     # with the service. The SSO source is named alongside forgejo because
     # its failure mode is a login that silently falls back, not an error.

nix/host-modules/hive-matrix.nix

@@ -86,7 +86,8 @@ let
   # saying so, as the token path below.
   #
   # `hiveName` has no fallback here for the reason ./glue-matrix-bao-token.nix
-  # gives at its own use of it: it is asserted set for every hyperhive host.
+  # gives at its own use of it: it is asserted set on every host that runs the
+  # homeserver.
   hiveLocalpart = "hive-${toString config.services.hyperhive.hiveName}";
 
   # The `as_token`, and the `hs_token` the spec requires alongside it. Both

nix/host-modules/hive-network.nix

@@ -35,7 +35,7 @@ in
   imports = [
     (lib.mkRemovedOptionModule [ "services" "hyperhive" "network" "isolateContainers" ] ''
       Network isolation is the only mode and is always on whenever
-      hyperhive is enabled; the shared-netns path was removed. Remove
+      the hive runs; the shared-netns path was removed. Remove
       the setting.
     '')
     (lib.mkRemovedOptionModule [ "services" "hyperhive" "network" "upstreamDns" ] ''
@@ -148,11 +148,12 @@ in
   };
 
   config = lib.mkMerge [
-    # Identity checks belong to hyperhive being on, not to the bridge
+    # Identity checks belong to the hive being on, not to the bridge
     # being up: a hive with no domain is misconfigured either way, and
     # moving them under the bridge gate would hide them on exactly the
-    # hosts that are hardest to debug.
+    # hosts that are hardest to debug. `hiveName` is asserted in
-    (lib.mkIf config.services.hyperhive.enable {
+    # ./hyperhive.nix, where more than the hive depends on it.
+    (lib.mkIf config.services.hyperhive.deploy.hive-controller.enable {
       # This message is only useful if an operator can actually reach
       # it, and an assertion competes with every eager default that
       # reads the value it guards: option defaults that interpolate the
@@ -196,16 +197,6 @@ in
             `services.hyperhive.domain` for you.
           '';
         }
-        {
-          assertion = config.services.hyperhive.hiveName != null;
-          message = ''
-            hyperhive requires services.hyperhive.hiveName to be set —
-            it is this hive's label within the swarm, and the leftmost
-            part of the domain it is addressed by
-            (`<hiveName>.<swarm.domain>`), not only a display name.
-            Set it (`services.hyperhive.hiveName = "pr1ma";`).
-          '';
-        }
       ];
     })
 

nix/host-modules/hive-priv.nix

@@ -19,7 +19,7 @@ let
   '';
 in
 {
-  config = lib.mkIf cfg.enable {
+  config = lib.mkIf config.services.hyperhive.deploy.hive-controller.enable {
     # Socket unit for hive-priv — the narrow root helper that executes
     # privileged operations on behalf of hive-c0re. Systemd creates and
     # holds `/run/hive/priv.sock` before the first connection arrives.

nix/host-modules/hive-tls.nix

@@ -37,12 +37,11 @@ let
 
   # The host-managed hive CA is the trust anchor for self-signed mode.
   # It is only stood up when the gateway actually serves a self-signed
-  # cert: the gateway must be in self-signed mode. `domain` is required
+  # cert: the gateway must run here and be in self-signed mode. The
-  # (asserted in hive-network.nix), so the leaf SANs always have a
+  # self-signed condition is the gateway module's single source of truth
-  # domain to derive from. The self-signed condition is the gateway
+  # (`gateway.useSelfSigned`): true when neither an operator cert
-  # module's single source of truth (`gateway.useSelfSigned`): true when
+  # (`tls.certDir`) nor ACME is set.
-  # neither an operator cert (`tls.certDir`) nor ACME is set.
+  active = gatewayCfg.enable && gatewayCfg.useSelfSigned;
-  active = hyperhiveCfg.enable && gatewayCfg.useSelfSigned;
 
   # How this hive's CA comes into existence when it is missing — and it
   # is one of exactly two things, chosen by config rather than by what
@@ -1022,7 +1021,14 @@ in
     # bundle. It is the ANCHOR bundle rather than `ca.pem` for the reason
     # spelled out where the bundle is written above; no key path is ever
     # exposed (an agent that could read one could mint trusted certs).
-    systemd.services.hive-c0re.environment.HIVE_TLS_CA_PATH = "${cfg.stateDir}/trust-bundle.pem";
+    #
+    # ⚠️ Every line here that names another daemon's unit is gated on that
+    # daemon's own enable: the gateway also runs on hosts with no hive and no
+    # controller, and defining an environment key on a unit that does not
+    # exist CREATES a unit fragment for it — inert (no `ExecStart`, empty
+    # `wantedBy`, never activated), and it evaluates and builds clean.
+    systemd.services.hive-c0re.environment.HIVE_TLS_CA_PATH =
+      lib.mkIf hyperhiveCfg.deploy.hive-controller.enable "${cfg.stateDir}/trust-bundle.pem";
 
     # The same anchor, named for the swarm-queue clients that need it when
     # they mint a token from authelia over TLS. Declared HERE, beside the
@@ -1038,18 +1044,11 @@ in
     # variable name. The anchor was never missing; nothing pointed the queue
     # client at it.
     #
-    # Set unconditionally within this module's `active` guard, exactly like
+    # Where there is no hive CA this module contributes nothing at all, and
-    # the line above: where there is no hive CA this module contributes
+    # the clients then fall back to the platform roots — which is correct for
-    # nothing at all, and the clients then fall back to the platform roots —
+    # a swarm fronted by a public certificate.
-    # which is correct for a swarm fronted by a public certificate.
+    systemd.services.hive-c0re.environment.HIVE_C0RE_OIDC_CA_FILE =
-    systemd.services.hive-c0re.environment.HIVE_C0RE_OIDC_CA_FILE = "${cfg.stateDir}/trust-bundle.pem";
+      lib.mkIf hyperhiveCfg.deploy.hive-controller.enable "${cfg.stateDir}/trust-bundle.pem";
-    # ⚠️ Gated, where the hive-c0re line above is not, and the asymmetry is
-    # the point: hive-c0re runs on every hive, the controller runs on one.
-    # Defining an environment key on a unit that does not exist CREATES a
-    # unit fragment for it — inert (no `ExecStart`, empty `wantedBy`, never
-    # activated) but present on every non-controller hive with a CA. Caught
-    # in review on this PR; it evaluates and builds clean either way, which
-    # is exactly why it needed a reviewer rather than a check.
     systemd.services.swarm-controller.environment.SWARM_CONTROLLER_OIDC_CA_FILE =
       lib.mkIf hyperhiveCfg.deploy.swarm-controller.enable "${cfg.stateDir}/trust-bundle.pem";
   };

nix/host-modules/hyperhive.nix

@@ -1,7 +1,6 @@
-# Top-level, cross-cutting hyperhive options: the master enable
+# Top-level, cross-cutting hyperhive options: the hive's identity
-# switch, the hive's identity (domain + display names), and hive-wide
+# (domain + display names) and hive-wide feature toggles read by several
-# feature toggles read by several subsystem modules. Imported by the
+# subsystem modules. Imported by the ./default.nix aggregator.
-# ./default.nix aggregator.
 {
   lib,
   config,
@@ -22,13 +21,9 @@ in
     )
   ];
 
-  # Top-level hyperhive enable flag. When true, automatically enables
-  # hive-c0re and the on-by-default hyperhive subsystems.
-  options.services.hyperhive.enable = lib.mkEnableOption "hyperhive — the agent swarm coordinator";
-
   # Canonical hive DNS domain shared by every subsystem that needs a
   # stable hostname. Typed nullOr (default null) so the option always
-  # exists, but it's REQUIRED whenever hyperhive is enabled — an
+  # exists, but it's REQUIRED wherever this host runs a hive — an
   # assertion in hive-network.nix fails eval when it's unset, since
   # matrix bakes it in on first boot and the gateway/forge/agent URLs all
   # derive from it (no safe default). Full identity-surface
@@ -61,7 +56,8 @@ in
       stable name (currently: `services.hyperhive.swarm.matrix.serverName`
       derives from this, defaulting to
       `matrix.''${services.hyperhive.domain}` when `serverName` is
-      null). **Required** when `services.hyperhive.enable` — eval fails
+      null). **Required** when
+      `services.hyperhive.deploy.hive-controller.enable` — eval fails
       with a helpful message if it's unset (it's baked into matrix on
       first boot and drives the gateway/forge/agent URLs, with no safe
       default; changing it later is destructive). Exposed to agents as
@@ -88,24 +84,22 @@ in
   # nothing — measured, after this warning fired on the conventional
   # case. `mkOptionDefault` is priority 1500, so anything lower is a
   # definition someone actually wrote (100 plain, 1000 mkDefault).
-  config.warnings =
+  config.warnings = lib.optional (options.services.hyperhive.domain.highestPrio < 1500) ''
-    lib.optional (hiveCfg.enable && options.services.hyperhive.domain.highestPrio < 1500)
+    services.hyperhive.domain is set explicitly and is deprecated. This
-      ''
+    hive's address belongs in the swarm directory, which every hive in
-        services.hyperhive.domain is set explicitly and is deprecated. This
+    the swarm shares a copy of:
-        hive's address belongs in the swarm directory, which every hive in
-        the swarm shares a copy of:
 
-          services.hyperhive.swarm.hives."${toString hiveCfg.hiveName}".domain = "${toString hiveCfg.domain}";
+      services.hyperhive.swarm.hives."${toString hiveCfg.hiveName}".domain = "${toString hiveCfg.domain}";
 
-        (Or drop the value entirely if it is the conventional
+    (Or drop the value entirely if it is the conventional
-        `<hiveName>.<swarm.domain>` — that is the directory entry's own
+    `<hiveName>.<swarm.domain>` — that is the directory entry's own
-        default.)
+    default.)
 
-        Setting it here still wins, so nothing is broken right now. What it
+    Setting it here still wins, so nothing is broken right now. What it
-        does not do is tell the other hives: they read this hive's address
+    does not do is tell the other hives: they read this hive's address
-        out of their copy of the directory, so a value written only here
+    out of their copy of the directory, so a value written only here
-        leaves them pointing somewhere else with nothing detecting it.
+    leaves them pointing somewhere else with nothing detecting it.
-      '';
+  '';
 
   # Where the swarm lives. Declared beside the hive's own identity
   # because it is what that identity is derived FROM — every hive in a
@@ -123,7 +117,8 @@ in
       `services.hyperhive.hiveName`, list the hives by name, and no
       hive in the swarm states an address at all.
 
-      **Required** when `services.hyperhive.enable`, and deliberately
+      **Required** when
+      `services.hyperhive.deploy.hive-controller.enable`, and deliberately
       not defaulted: there is no fallback worth having. A guessed
       swarm domain is a wrong hostname that evaluates cleanly and
       deploys, which is worse than an eval failure telling an
@@ -144,7 +139,10 @@ in
     example = "pr1ma";
     description = ''
       Human-readable name of this single-host hive instance.
-      **Required** when `services.hyperhive.enable`. Distinct from
+      **Required** when this host runs a hive, the swarm's secret store
+      or its homeserver
+      (`services.hyperhive.deploy.hive-controller.enable`,
+      `deploy.bao.enable`, `deploy.matrix.enable`). Distinct from
       `services.hyperhive.domain` (the machine-addressable DNS name)
       but no longer merely cosmetic: a hive occupies
       `<hiveName>.<swarm.domain>`, so this is the label the hive is
@@ -154,6 +152,28 @@ in
     '';
   };
 
+  # Each of these deployments turns `hiveName` into an identifier with no
+  # fallback: hive-c0re's OIDC client and matrix localpart, the CN of the
+  # store's `client.pem` (./glue-bao-tls.nix), and the `hives/<name>` path
+  # the matrix token and queue credential readers fetch. A null there renders
+  # as an empty string that evaluates and deploys.
+  config.assertions = [
+    {
+      assertion =
+        !(
+          hiveCfg.deploy.hive-controller.enable || hiveCfg.deploy.bao.enable || hiveCfg.deploy.matrix.enable
+        )
+        || hiveCfg.hiveName != null;
+      message = ''
+        hyperhive requires services.hyperhive.hiveName to be set on a host
+        that runs a hive, the swarm's secret store or its homeserver — it is
+        this hive's label within the swarm, and the leftmost part of the
+        domain it is addressed by (`<hiveName>.<swarm.domain>`), not only a
+        display name. Set it (`services.hyperhive.hiveName = "pr1ma";`).
+      '';
+    }
+  ];
+
   # The one hive-level option that describes something ABOVE the hive,
   # which is why it sits under `swarm` with the swarm-global services
   # rather than beside `hiveName`.

nix/host-modules/swarm-authelia.nix

@@ -919,7 +919,7 @@ in
     };
   };
 
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.authelia.enable) {
+  config = lib.mkIf deployCfg.authelia.enable {
     # The derived half of the client list, declared the same way an
     # operator declares one. Everything downstream then reads a single
     # uniformly-typed `cfg.oidc.clients` and cannot tell the parts apart —

nix/host-modules/swarm-bao.nix

@@ -1573,7 +1573,7 @@ in
     # they still fire when the cert paths are unset — the arm below is not
     # evaluated in that case, and an assertion that disappears exactly when
     # its subject is broken would be worse than none.
-    (lib.mkIf (hyperhiveCfg.enable && deployCfg.bao.enable) {
+    (lib.mkIf deployCfg.bao.enable {
       assertions = [
         {
           assertion = lib.versionOlder baoDeploy.package.version "2.7.0";
@@ -1655,7 +1655,7 @@ in
       services.hyperhive.network.enable = lib.mkDefault true;
     })
 
-    (lib.mkIf (hyperhiveCfg.enable && deployCfg.bao.enable) {
+    (lib.mkIf deployCfg.bao.enable {
       # The wrapper alone, never `baoDeploy.package`: openbao's own module
       # installs the CLI *inside* the container, and this host had none at all,
       # so an operator either hopped into the container or re-typed the
@@ -1845,7 +1845,7 @@ in
       };
     })
 
-    (lib.mkIf (hyperhiveCfg.enable && deployCfg.bao.enable && haveServerTls) {
+    (lib.mkIf (deployCfg.bao.enable && haveServerTls) {
       # Provisions the TPM-backed token the seal above names. One-shot and
       # idempotent on ABSENCE, never on content: regenerating a PIN would
       # orphan an already-sealed store, so a rebuild must not rotate it.

nix/host-modules/swarm-ca.nix

@@ -106,7 +106,7 @@ in
     };
   };
 
-  config = lib.mkIf (hyperhiveCfg.enable && cfg.autoConfigure) {
+  config = lib.mkIf cfg.autoConfigure {
     # A CA that fails to issue is invisible until something makes a TLS call
     # hours later, so this oneshot is worth more than most services.
     services.hyperhive.swarm.otel.journaldUnits = [ "swarm-ca" ];

nix/host-modules/swarm-controller.nix

@@ -349,7 +349,7 @@ in
     # `enable` moved to `services.hyperhive.deploy.swarm-controller.enable` — see
     # ./deploy.nix. `services.hyperhive.deploy.singleHostSwarm` still
     # asserts it, and that was never an exception to "not derived from
-    # services.hyperhive.enable": that mode says "this box is the whole
+    # deploy.hive-controller.enable": that mode says "this box is the whole
     # deployment", which answers the topology question outright, where
     # `enable` alone never can. Both packages moved to that same
     # `deploy.swarm-controller` block. What stays here is what the daemon IS.

nix/host-modules/swarm-grafana.nix

@@ -405,7 +405,7 @@ in
     };
   };
 
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.grafana.enable) {
+  config = lib.mkIf deployCfg.grafana.enable {
     # The gateway name and the quick-link, both inside `deploy.grafana` — that
     # guard is the load-bearing part. Every hive in a swarm may know this UI
     # exists, but only the host that RUNS it may claim the name; a client

nix/host-modules/swarm-secret-publisher.nix

@@ -47,7 +47,7 @@ let
 
   # Both halves have to be here: the mint (authelia, for the plaintext) and an
   # identity (for the store). Neither implies the other.
-  active = hyperhiveCfg.enable && cfg.enable && deployCfg.authelia.enable && haveClientIdentity;
+  active = cfg.enable && deployCfg.authelia.enable && haveClientIdentity;
 
   hiveNames = lib.attrNames hyperhiveCfg.swarm.hives;
 

nix/host-modules/swarm-victorialogs.nix

@@ -134,7 +134,7 @@ in
     '';
   };
 
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.victorialogs.enable) {
+  config = lib.mkIf deployCfg.victorialogs.enable {
     # This store publishes its own health as prometheus metrics on the same
     # listener it serves queries on, so the swarm's collector scrapes it with
     # no exporter and no extra port — same arrangement as the metrics store.

nix/host-modules/swarm-victoriametrics.nix

@@ -95,7 +95,7 @@ in
     '';
   };
 
-  config = lib.mkIf (hyperhiveCfg.enable && deployCfg.victoriametrics.enable) {
+  config = lib.mkIf deployCfg.victoriametrics.enable {
     # The gateway name and the quick-link, both inside `deployCfg.victoriametrics.enable` — that
     # guard is the load-bearing part. Every hive in a swarm may know this
     # store exists, but only the host that RUNS it may claim the name; a

nix/host-modules/swarm-wireguard.nix

@@ -84,13 +84,11 @@
     };
   };
 
-  # Gated on the mesh itself, NOT on the c0re daemon. The mesh is host
+  # Gated on the mesh itself, NOT on `deploy.hive-controller.enable`. The
-  # networking, not a c0re feature: a swarm host that runs no hive —
+  # mesh is host networking, not a c0re feature: a swarm host that runs no
-  # the snapshot store, for one — still has to join the mesh, and under
+  # hive — the snapshot store, for one — still has to join the mesh.
-  # the old `c0re.enable` gate it silently got no `wg-hive` interface
+  # Nothing below is c0re-specific; the peer data c0re consumes
-  # at all. Nothing below is c0re-specific; the peer data c0re consumes
+  # (HIVE_PEER_CA_PATHS) is rendered in ./hive-c0re and stays gated there.
-  # (HIVE_PEER_CA_PATHS) is rendered in ./hive-c0re and stays gated
-  # there.
   config = lib.mkIf config.services.hyperhive.deploy.wireguard.enable {
     assertions = [
       {

nix/module-eval/bao-matrix-reader.nix

@@ -70,7 +70,8 @@ let
 
   # The same omission on a hive that does NOT run a homeserver. Separates the
   # matrix refusal's `deploy.matrix.enable` clause from the queue refusal, which
-  # has no toggle to check — an arm below reads exactly one refusal off it.
+  # checks only the hive's own toggle — an arm below reads exactly one refusal
+  # off it.
   remoteReaderNoMatrixMissingLeaves = hive {
     deploy.bao.clientCertFile = "/etc/pki/bao-client.pem";
     deploy.bao.clientKeyFile = "/etc/pki/bao-client-key.pem";

nix/module-eval/core-toggle.nix

@@ -30,17 +30,17 @@ let
 
   bare = hive { };
 
-  # The same stub with the central toggle off. Paired with `bare` below to pin
+  # The same stub with the central toggle (`deploy.hive-controller.enable`)
-  # the defaults that used to read `services.hyperhive.enable` and no longer
+  # off. Paired with `bare` below to pin the defaults that do not read it:
-  # do: each is asserted to hold the SAME literal in both, so a future edit
+  # each is asserted to hold the SAME literal in both, so a future edit
-  # that quietly re-introduces the dependency — or that changes what the
+  # that quietly introduces the dependency — or that changes what the
   # default renders for a hive with the toggle on — fails here. Reading an
   # option off this fixture forces that option only, not the config, so the
   # toggle being off costs nothing. Also the "installs the modules and turns
   # nothing on" host the swarm-service absences below read: none of the
   # per-service deployment toggles derives from the hive being on, so it
   # renders the same absences `bare` does.
-  centralToggleOff = hive { enable = false; };
+  centralToggleOff = hive { deploy.hive-controller.enable = false; };
 
   # Every hive defaults the agents' queue address to the queue's name, so the
   # only hive without one is a hive told to have none.
@@ -104,7 +104,7 @@ let
       name = "the swarm controller's forgeTokenFile default does not consult the central toggle";
       ok =
         (hive {
-          enable = false;
+          deploy.hive-controller.enable = false;
           deploy.forgejo.enable = true;
         }).services.hyperhive.deploy.swarm-controller.forgeTokenFile
         == "/var/lib/hyperhive-forge/swarm-controller.token";
@@ -453,6 +453,55 @@ let
         && bare.services.dnsmasq.enable
         && bare.networking.bridges ? hive-br0;
     }
+    {
+      # A host config written against either old spelling still runs its hive.
+      # The builder's own `true` is lowered to `mkDefault false`, so only the
+      # forwarded definition can turn it on.
+      name = "the old hive toggles forward to deploy.hive-controller.enable and warn";
+      ok =
+        let
+          renamedFrom =
+            old: m:
+            lib.any (
+              w: lib.hasInfix old w && lib.hasInfix "services.hyperhive.deploy.hive-controller.enable" w
+            ) m.warnings;
+          viaOld =
+            extra:
+            hive (
+              extra
+              // {
+                deploy.hive-controller.enable = lib.mkDefault false;
+              }
+            );
+          oldEnable = viaOld { enable = true; };
+          oldC0re = viaOld { c0re.enable = true; };
+        in
+        oldEnable.services.hyperhive.deploy.hive-controller.enable
+        && oldEnable.systemd.services ? hive-c0re
+        && renamedFrom "services.hyperhive.enable" oldEnable
+        && oldC0re.services.hyperhive.deploy.hive-controller.enable
+        && oldC0re.systemd.services ? hive-c0re
+        && renamedFrom "services.hyperhive.c0re.enable" oldC0re;
+    }
+    {
+      # Refused wherever something turns the name into an identifier, and only
+      # there. The store host is the control that the refusal is not the hive's
+      # alone; the host running neither is the control that it is gated at all.
+      name = "a missing hiveName is refused on a hive and on a store host, not elsewhere";
+      ok =
+        let
+          refusedHiveName =
+            extra:
+            lib.any (a: !a.assertion && lib.hasInfix "services.hyperhive.hiveName to be set" a.message)
+              (hive ({ hiveName = null; } // extra)).assertions;
+        in
+        refusedHiveName { }
+        && refusedHiveName {
+          deploy.hive-controller.enable = false;
+          deploy.bao.enable = true;
+        }
+        && !(refusedHiveName { deploy.hive-controller.enable = false; });
+    }
   ];
 in
 runGroup "core-toggle" cases

nix/module-eval/lib.nix

@@ -59,7 +59,7 @@ let
           # just one level down. `recursiveUpdate` merges nested attrsets
           # all the way down instead.
           services.hyperhive = lib.recursiveUpdate {
-            enable = true;
+            deploy.hive-controller.enable = true;
             hiveName = "h1";
             swarm.domain = "t.local";
             swarm.hives.h1.domain = "h1.t.local";

nix/module-eval/swarm-services-switch.nix

@@ -23,20 +23,37 @@ let
     swarmServiceEnables
     ;
 
-  # The swarm-services toggle with the central one off, so the only thing
+  # A dedicated services host with hives elsewhere: the swarm-services
-  # that can enable the gateway/resolver/bridge here is that toggle's own
+  # toggle and no hive, the recipe docs/swarm/services.md gives.
-  # module — every other module that asserts them is behind `enable`.
   swarmServicesOnly = hive {
-    enable = false;
+    deploy.hive-controller.enable = false;
     deploy.allSwarmServices = true;
   };
 
+  # The same switch with every service it owns placed elsewhere, so the only
+  # thing that can enable the gateway/resolver/bridge here is that toggle's
+  # own module — each service module asserts them from its own `enable`.
+  swarmServicesSwitchAlone = hive {
+    deploy.hive-controller.enable = false;
+    deploy.allSwarmServices = true;
+    deploy.matrix.enable = false;
+    otel.enable = false;
+    deploy.authelia.enable = false;
+    deploy.nats.enable = false;
+    deploy.swarm-otel.enable = false;
+    deploy.victoriametrics.enable = false;
+    deploy.grafana.enable = false;
+    deploy.victorialogs.enable = false;
+    deploy.bao.enable = false;
+    deploy.forgejo.enable = false;
+  };
+
   # Ports asked for on such a host. The request is the whole condition: the
   # firewall hole exists because an operator named a port, not because the
   # hive is running, and an agent reaching a host service is a claim about
   # the host's own listeners either way.
   exposedPortsNoHive = hive {
-    enable = false;
+    deploy.hive-controller.enable = false;
     network.exposeHostPorts = [ 5432 ];
   };
 
@@ -129,9 +146,44 @@ let
       # module rather than from any of their defaults.
       name = "the swarm-services toggle turns on the gateway, resolver and bridge by itself";
       ok =
-        swarmServicesOnly.services.hyperhive.gateway.enable
+        swarmServicesSwitchAlone.services.hyperhive.gateway.enable
-        && swarmServicesOnly.services.hyperhive.gateway.dns.enable
+        && swarmServicesSwitchAlone.services.hyperhive.gateway.dns.enable
-        && swarmServicesOnly.services.hyperhive.network.enable;
+        && swarmServicesSwitchAlone.services.hyperhive.network.enable;
+    }
+    {
+      # Each service is gated on its own deployment toggle alone, so a host
+      # that runs no hive still runs every shared service the switch turns
+      # on, plus the plumbing and the self-signed CA they are served through.
+      # Nothing starts the hive's own daemons. `hive-c0re` is checked by what
+      # starts it rather than by key: ../host-modules/hive-network.nix's bridge
+      # block writes to its environment wherever the bridge is up.
+      name = "a services-only host runs the swarm's shared services and no hive";
+      ok =
+        let
+          c = swarmServicesOnly.containers;
+          s = swarmServicesOnly.systemd.services;
+          h = swarmServicesOnly.services.hyperhive;
+        in
+        lib.all (m: c ? ${m}) [
+          "swarm-authelia"
+          "swarm-bao"
+          "swarm-grafana"
+          "swarm-victorialogs"
+          "swarm-victoriametrics"
+          "swarm-otel"
+          "swarm-nats"
+          "hive-matrix"
+          "hive-forge"
+        ]
+        && h.gateway.enable
+        && h.gateway.dns.enable
+        && h.network.enable
+        && s ? hive-tls-ca
+        && s ? swarm-bao-pki
+        && (s.hive-c0re.wantedBy or [ ]) == [ ]
+        && !(swarmServicesOnly.systemd.sockets ? hive-c0re)
+        && !(swarmServicesOnly.systemd.sockets ? hive-priv)
+        && !(s ? swarm-bao-queue-agent);
     }
     {
       # An operator's explicit `false` beats every `mkDefault` assertion,

swarm-controller/README.md

@@ -5,8 +5,9 @@ owns what is true _across_ hives — so a swarm runs one of them and most hives
 leave it off.
 
 Opt-in per host via `services.hyperhive.deploy.swarm-controller.enable`, which is
-deliberately **not** derived from `services.hyperhive.enable`: turning it on is
+deliberately **not** derived from
-a statement about swarm topology, not about whether hyperhive is installed.
+`services.hyperhive.deploy.hive-controller.enable`: turning it on is a statement
+about swarm topology, not about whether this host runs a hive.
 
 ## What it does today