influxdb: place its directories, hand secrets over as files, name its UI

The manifest named /services/influxdb and /var/lib/influxdb-module — one
machine's paths — and passed the admin password and token through the
environment. ace is moving its 2022 instance onto the mesh, so the module
has to be what it is on any machine.

- data, config and state are placed directories; the data keeps 1000:1000,
  the image's influxdb user, which is who owns ace's data today.
- the init secrets reach the image through its own
  DOCKER_INFLUXDB_INIT_{PASSWORD,ADMIN_TOKEN}_FILE; the vault's files are
  mounted read-only. secrets-in-environment is gone.
- the sidecar reads its token from the same file (MESH_INFLUXDB_TOKEN_FILE,
  added to client.ts) and reaches the server at its assigned machine port
  (${port:8086}) instead of assuming 8086. The unused config-dir mount,
  which held the CLI's copy of the admin token, is dropped.
- the api endpoint contributes a route: the web UI is how people use it,
  and reach is the assignment's to say.

Verified: catalogue tests pass with MESH_CATALOGUE pointed at this tree.
The pinned 2.9.1 image, run on a scratch copy of ace's 2.4.0 data, opens
it, runs its metadata migrations (backing up the pre-upgrade bolt/sqlite)
and hashes the two stored tokens; /health passes. A fresh setup through
the _FILE variables, with dummy secrets as root-owned 0600 files, accepts
the token (200 on /api/v2/buckets) and the password (204 on /signin).
client.ts typechecks strict and reads the token file, tolerating the
endpoints key in its config.

modules/influxdb/client.ts

@@ -24,6 +24,13 @@ function meshConfig(file?: string): Record<string, string> {
   catch { return {}; }
 }
 
+/** A secret delivered as a file, trimmed; undefined when there is none, so the caller can fall back. */
+function tokenFromFile(file?: string): string | undefined {
+  if (!file) return undefined;
+  try { return readFileSync(file, "utf8").trim() || undefined; }
+  catch { return undefined; }
+}
+
 export class InfluxDBClient {
   readonly baseUrl: string;
 
@@ -43,8 +50,10 @@ export class InfluxDBClient {
   static fromEnv(env: NodeJS.ProcessEnv = process.env): InfluxDBClient {
     const cfg = meshConfig(env.MESH_INFLUXDB_CONFIG_FILE);
     const url = cfg.url ?? env.MESH_INFLUXDB_URL ?? `http://127.0.0.1:${env.INFLUXDB_PORT ?? "8086"}`;
-    const token = cfg.token ?? env.MESH_INFLUXDB_TOKEN;
-    if (!token) throw new Error("no InfluxDB token — set MESH_INFLUXDB_TOKEN");
+    // The token reaches the process as a file (novox/hq ADR 0086); the environment variable stays
+    // only for a workstation running the tools by hand.
+    const token = cfg.token ?? tokenFromFile(env.MESH_INFLUXDB_TOKEN_FILE) ?? env.MESH_INFLUXDB_TOKEN;
+    if (!token) throw new Error("no InfluxDB token — set MESH_INFLUXDB_TOKEN_FILE");
     const org = cfg.org ?? env.MESH_INFLUXDB_ORG ?? "mesh";
     return new InfluxDBClient(url, token, org);
   }

modules/influxdb/module.json

@@ -13,7 +13,7 @@
       "port": 8086,
       "protocol": "tcp",
       "from": "mesh",
-      "why": "queries and writes, over http"
+      "why": "queries, writes and the web UI, over http; a name is a route grant"
     }
   ],
   "resources": [
@@ -26,46 +26,45 @@
     {
       "id": "state",
       "type": "directory",
-      "path": "/var/lib/influxdb-module",
-      "mode": "0700"
-    },
-    {
-      "id": "server-env",
-      "type": "file",
-      "path": "/var/lib/influxdb-module/server.env",
-      "mode": "0600",
-      "content": "DOCKER_INFLUXDB_INIT_MODE=setup\nDOCKER_INFLUXDB_INIT_USERNAME=admin\nDOCKER_INFLUXDB_INIT_PASSWORD=${secret:admin}\nDOCKER_INFLUXDB_INIT_ADMIN_TOKEN=${secret:admin-token}\nDOCKER_INFLUXDB_INIT_ORG=mesh\nDOCKER_INFLUXDB_INIT_BUCKET=default\n"
+      "mode": "0700",
+      "place": "."
     },
     {
       "id": "data",
       "type": "directory",
-      "path": "/services/influxdb/data",
       "mode": "0700",
       "owner": "1000:1000"
     },
     {
       "id": "config",
       "type": "directory",
-      "path": "/services/influxdb/config",
       "mode": "0700",
       "owner": "1000:1000"
     },
+    {
+      "id": "server-env",
+      "type": "file",
+      "path": "${dir:state}/server.env",
+      "mode": "0600",
+      "content": "DOCKER_INFLUXDB_INIT_MODE=setup\nDOCKER_INFLUXDB_INIT_USERNAME=admin\nDOCKER_INFLUXDB_INIT_PASSWORD_FILE=/run/secrets/admin\nDOCKER_INFLUXDB_INIT_ADMIN_TOKEN_FILE=/run/secrets/admin-token\nDOCKER_INFLUXDB_INIT_ORG=mesh\nDOCKER_INFLUXDB_INIT_BUCKET=default\n"
+    },
     {
       "id": "server",
       "type": "container",
       "name": "influxdb",
       "image": "influxdb@sha256:f75e48af0598e8aec7986e991a848d19a119101a7d563a2e5db1dfaac9c45daa",
       "env-file": [
-        "/var/lib/influxdb-module/server.env"
+        "${dir:state}/server.env"
       ],
       "ports": [
         "8086"
       ],
       "volumes": [
-        "/services/influxdb/data:/var/lib/influxdb2",
-        "/services/influxdb/config:/etc/influxdb2"
-      ],
-      "secrets-in-environment": "the image honours DOCKER_INFLUXDB_INIT_PASSWORD_FILE and _ADMIN_TOKEN_FILE; convertible, awaiting a bed that proves it"
+        "${dir:data}:/var/lib/influxdb2",
+        "${dir:config}:/etc/influxdb2",
+        "${dir:state}/admin.secret:/run/secrets/admin:ro",
+        "${dir:state}/admin-token.secret:/run/secrets/admin-token:ro"
+      ]
     },
     {
       "id": "runtime-config",
@@ -83,13 +82,13 @@
       "volumes": [
         "/var/lib/mesh/influxdb/broker:/run/secrets/broker:ro",
         "/var/lib/mesh/influxdb/config.json:/run/config/config.json:ro",
-        "/services/influxdb/config:/var/lib/influxdb/config:ro"
+        "${dir:state}/admin-token.secret:/run/secrets/admin-token:ro"
       ],
       "env": {
         "MESH_BROKER_FILE": "/run/secrets/broker",
-        "MESH_INFLUXDB_URL": "http://127.0.0.1:8086",
+        "MESH_INFLUXDB_URL": "http://127.0.0.1:${port:8086}",
         "MESH_INFLUXDB_CONFIG_FILE": "/run/config/config.json",
-        "MESH_INFLUXDB_CONFIG_DIR": "/var/lib/influxdb/config"
+        "MESH_INFLUXDB_TOKEN_FILE": "/run/secrets/admin-token"
       },
       "restart-on": [
         "runtime-config"
@@ -97,6 +96,22 @@
       "artifact": "runtime"
     }
   ],
+  "requires": [
+    "route",
+    "secret"
+  ],
+  "contributes": {
+    "route": {
+      "label": "influxdb",
+      "endpoint": "api"
+    }
+  },
+  "secrets": {
+    "secret": {
+      "admin": "${dir:state}/admin.secret",
+      "admin-token": "${dir:state}/admin-token.secret"
+    }
+  },
   "build": {
     "on": [
       {
@@ -117,14 +132,5 @@
         "from": "Dockerfile"
       }
     ]
-  },
-  "requires": [
-    "secret"
-  ],
-  "secrets": {
-    "secret": {
-      "admin": "/var/lib/influxdb-module/admin.secret",
-      "admin-token": "/var/lib/influxdb-module/admin-token.secret"
-    }
   }
 }