sdk/fidl/fuchsia.sys2/decls/capability_decl.fidl

// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library fuchsia.sys2;

using fuchsia.component;
using fuchsia.io2;

/// Declares a capability defined by this component.
flexible union CapabilityDecl {
    1: ServiceDecl service;
    2: ProtocolDecl protocol;
    3: DirectoryDecl directory;
    4: StorageDecl storage;
    5: RunnerDecl runner;
    6: ResolverDecl resolver;
};

/// Declares a service capability backed by this component.
///
/// To learn more about services, see:
/// https://fuchsia.dev/fuchsia-src/glossary#service
table ServiceDecl {
    /// The name of this service.
    1: fuchsia.component.name name;

    /// The path to the service in the component's outgoing directory.
    2: string:fuchsia.component.MAX_PATH_LENGTH source_path;
};

/// Declares a protocol capability backed by this component.
///
/// To learn more about protocols, see:
/// https://fuchsia.dev/fuchsia-src/glossary#protocol
table ProtocolDecl {
    /// The name of this protocol.
    1: fuchsia.component.name name;

    /// The path to the protocol in the component's outgoing directory.
    2: string:fuchsia.component.MAX_PATH_LENGTH source_path;
};

/// Declares a directory capability backed by this component.
///
/// To learn more about directories, see:
/// https://fuchsia.dev/fuchsia-src/glossary#directory
table DirectoryDecl {
    /// The name of this directory.
    1: fuchsia.component.name name;

    /// The path to the directory in the component's outgoing directory.
    2: string:fuchsia.component.MAX_PATH_LENGTH source_path;

    /// The maximum rights that can be set by a component using this directory.
    3: fuchsia.io2.Rights rights;
};

/// Declares a storage capability backed by a directory from which data, cache,
/// or meta storage can be offered.
table StorageDecl {
    /// The name of this storage
    1: fuchsia.component.name name;

    /// The provider of the backing directory capability relative to the
    /// component itself. Must be `parent`, `self`, or `child`.
    2: Ref source;

    /// The name of the directory capability from `source` that backs the
    /// storage.
    3: fuchsia.component.name backing_dir;

    /// The subdirectory of the source directory that will back the storage
    4: string:fuchsia.component.MAX_PATH_LENGTH subdir;
};

/// Declares a runner capability backed by a service.
table RunnerDecl {
    /// The name of this runner.
    1: fuchsia.component.name name;

    /// The provider of the underlying service relative to the component itself.
    /// Must be `parent`, `self`, or `child`.
    2: Ref source;

    /// The path of the capability within the specified source.
    3: string:fuchsia.component.MAX_PATH_LENGTH source_path;
};

/// Declares a resolver which is responsible for resolving component URLs to actual components.
/// See `fuchsia.sys2.ComponentResolver` for the protocol resolvers are expected to implement.
table ResolverDecl {
    /// The name of this resolver.
    /// Must be non-empty, unique among resolvers declared in the same `ComponentDecl`, and
    /// contain only the following characters: [a-z0-9-_.].
    1: fuchsia.component.name name;

    /// The path of the capability in the declaring component's namespace.
    2: string:fuchsia.component.MAX_PATH_LENGTH source_path;
};