archy/docs/app-manifest-spec.md

App Manifest Specification

Accurate as of 2026-07-08. The canonical schema is the Rust parser in core/container/src/manifest.rs (AppManifest → AppDefinition); if this document and the code disagree, the code wins. See app-developer-guide.md for the authoring workflow.

Every app is a directory apps/<id>/ containing a manifest.yml with a single top-level app: block. Apps are declarative — the orchestrator owns the entire lifecycle; there is no per-app installer code.

One honest caveat: seven first-party apps still get Rust-side pre-start work through a hardcoded match app_id in ProdOrchestrator::run_pre_start_hooks — bitcoin-ui, filebrowser, lnd, archy-nbxplorer, btcpay-server, fedimint-clientd and grafana render or repair a config before start. That is orchestrator code rather than a per-app installer, but it is not manifest-declared, and the direction of travel is to replace each case with a reusable manifest primitive.

Top-level fields (app:)

Field	Type	Required	Notes
id	string	✅	Lowercase ASCII letters, digits and single hyphens only — no underscores, no leading/trailing -, no -- (is_valid_app_id). Should match the directory name, though nothing enforces that: the loader keys off app.id, so a mismatch silently registers the app under the id in the file rather than the folder.
name	string	✅	Display name.
version	string	✅	App version shown in the UI.
description	string	—	One-line description.
container	ContainerConfig	—	Image/build source + runtime shape (below).
dependencies	list	—	- storage: "10GB", - { app_id: bitcoin, version: … }, or a bare string.
resources	ResourceLimits	—	cpu_limit (int), memory_limit (e.g. "512m"), disk_limit.
security	SecurityPolicy	—	See Security.
ports	list of PortMapping	—	- { host: 8080, container: 80, protocol: tcp }.
volumes	list of Volume	—	See Volumes.
files	list of GeneratedFile	—	Config files written before create: { path, content, overwrite }. path must sit under a declared bind mount.
environment	list of string	—	- KEY=value pairs (static).
health_check	HealthCheck	—	{ type, endpoint/path, interval, timeout, retries }. type is free-form today; http is what the monitor exercises.
devices	list of string	—	Host device paths; must start with /dev/.
interfaces	map	—	Launch surfaces, keyed by name (main): { name, description, type, port, protocol, path }.
hooks	LifecycleHooks	—	Allow-listed lifecycle hooks. See Hooks.
anything else	—	—	Unknown keys are absorbed into an extensions map (serde flatten) and treated as transitional metadata — e.g. container_name, metadata, category, bitcoin_integration, lightning_integration. These are not typed schema; do not rely on them being validated.

container: (ContainerConfig)

Exactly one of image or build must be present (image XOR build).

Field	Type	Notes
image	string	Registry reference. Pull source.
image_signature	string	Optional signature reference for image verification.
pull_policy	string	Default if-not-present.
build	BuildConfig	Local build: { context, dockerfile (default "Dockerfile"), tag, build_args }.
network	string	Literal podman --network value (archy-net, host, a stack network, …). Omitted = rootless default isolated network.
network_aliases	list of string	Extra DNS names on network (podman --network-alias) — lets stack members answer to short baked-in hostnames (api, minio, relay).
entrypoint	list of string	Entrypoint override.
custom_args	list of string	Extra positional args appended after the image.
derived_env	list	- { key, template } — template rendered against host facts at apply time. The allow-list is exactly {{HOST_IP}}, {{HOST_MDNS}}, {{DISK_GB}}, {{BITCOIN_HOST}} (DERIVED_PLACEHOLDERS); an unknown name or unbalanced {{ fails validation. {{BITCOIN_HOST}} resolves to whichever Bitcoin app is running (bitcoin-knots or bitcoin-core, defaulting to knots). Never hard-code host specifics.
secret_env	list	- { key, secret_file } — value read from /var/lib/archipelago/secrets/<secret_file> and injected as a podman secret, so it never appears in podman inspect or unit files. secret_file must be a bare filename (no /, no ..).
generated_secrets	list	- { name, kind } — orchestrator materialises the secret on first use (0600, rootless service user, idempotent + self-healing). `kind ∈ hex16
generated_certs	list	- { crt, key, common_name?, sans? } — self-signed TLS materialised before create; CN/SANs rendered against host facts.
data_uid	string	"UID:GID" applied to the app's bind-mounted data dir before create (rootless subuid mapping, e.g. Postgres).

Security

security:
  readonly_root: true        # default true
  no_new_privileges: true    # default true
  capabilities: [CHOWN]      # default [] (cap-drop ALL, add back only these)
  network_policy: isolated   # isolated | bridge | host (default isolated)
  apparmor_profile: null     # optional profile name

Validation (enforced at AppManifest::validate()):

• Capabilities must come from the reviewed allow-list (CHOWN, DAC_OVERRIDE, FOWNER, NET_ADMIN, NET_BIND_SERVICE, NET_RAW, SETGID, SETUID, SYS_ADMIN).
• network_policy must be exactly isolated, bridge, or host.
• No container:/ns: network modes; devices must be /dev/*.
• Bind-mount sources are confined to /var/lib/archipelago (reviewed exceptions: the rootless podman socket and dbus).
• derived_env templates may only use the placeholder allow-list; secret_env/generated_secrets names must be bare filenames.
• Hook steps are validated against the hook allow-list (below).

Volumes

volumes:
  - type: bind               # bind | volume | tmpfs
    source: /var/lib/archipelago/myapp/data
    target: /data
    options: [rw]            # allow-list: rw, ro, z, Z, shared, …
  - type: tmpfs
    target: /tmp
    tmpfs_options: "rw,noexec,nosuid,size=256m"

Hooks

Declarative, allow-listed operations that run against the app's own container — never the host (design: manifest-hooks-design.md).

hooks:
  post_install:              # runs once after install, container running
    - copy_from_host:        # src relative to an allow-listed root (data dir / web-ui);
        src: web-ui/nostr-provider.js   # no absolute paths, no '..'
        dest: /usr/share/nginx/html/nostr-provider.js
    - exec: ["sh", "-c", "nginx -s reload"]   # podman exec inside the container
  pre_start: []              # reserved in the schema; executor not yet wired

Installation semantics

The orchestrator compiles the manifest into a rootless Podman container that survives backend restarts and reboots, and a level-triggered reconciler converges drift every 30 seconds (BootReconciler::DEFAULT_INTERVAL). Multi-container apps are sets of per-member manifests installed together via the stack orchestrator (api/rpc/package/stacks.rs) on an app-local network.

Quadlet is not the default path. config.use_quadlet_backends defaults to false, so ordinary apps still take the legacy podman create + start path; the Quadlet-unit-under-user.slice backend is opt-in per node (config key or ARCHIPELAGO_USE_QUADLET_BACKENDS) and stays behind the flag until the lifecycle harness has gone green against it. Companion UI containers are the exception that do use Quadlet today.

Distribution

Manifests ship two ways:

1. Signed catalog (primary): releases/app-catalog.json embeds the full manifest per app and carries an Ed25519 detached signature verified against the pinned release-root anchor. Nodes overlay catalog manifests over disk files — catalog wins for image-only apps; apps/<id>/manifest.yml on disk remains the fallback and is still required for build-source apps.
2. Decentralized marketplace: Nostr NIP-78 discovery with DID-signed manifests (marketplace-protocol.md). Note the marketplace uses its own flatter manifest schema, not this one.

Minimal example

app:
  id: myapp
  name: My App
  version: 1.0.0
  description: Does something useful
  container:
    image: docker.io/vendor/myapp:1.0.0
    generated_secrets:
      - { name: myapp-admin-password, kind: hex16 }
    secret_env:
      - { key: ADMIN_PASSWORD, secret_file: myapp-admin-password }
  ports:
    - { host: 8090, container: 8080 }
  volumes:
    - { type: bind, source: /var/lib/archipelago/myapp, target: /data, options: [rw] }
  health_check:
    type: http
    path: /health
  interfaces:
    main:
      type: ui
      port: 8090

Validate with scripts/validate-app-manifest.sh and regenerate the catalog with scripts/generate-app-catalog.py (drift-checked in CI by scripts/check-app-catalog-drift.py).