wehub-resource-sync
95 lines
4.5 KiB
Swift
95 lines
4.5 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//===----------------------------------------------------------------------===//
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import ContainerizationError
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import ContainerizationOCI
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import Foundation
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/// A multi-arch kernel image represented by an OCI image.
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public struct KernelImage: Sendable {
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/// The media type for a kernel image.
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public static let mediaType = "application/vnd.apple.containerization.kernel"
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/// The name or reference of the image.
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public var name: String { image.reference }
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let image: Image
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public init(image: Image) {
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self.image = image
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}
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}
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extension KernelImage {
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/// Return the kernel from a multi arch image for a specific system platform.
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public func kernel(for platform: SystemPlatform) async throws -> Kernel {
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let manifest = try await image.manifest(for: platform.ociPlatform())
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guard let descriptor = manifest.layers.first, descriptor.mediaType == Self.mediaType else {
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throw ContainerizationError(.notFound, message: "kernel descriptor for \(platform) not found")
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}
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let content = try await image.getContent(digest: descriptor.digest)
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return Kernel(
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path: content.path,
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platform: platform
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)
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}
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/// Create a new kernel image with the reference as the name.
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/// This will create a multi arch image containing kernel's for each provided architecture.
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public static func create(reference: String, binaries: [Kernel], labels: [String: String] = [:], imageStore: ImageStore, contentStore: ContentStore) async throws -> KernelImage
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{
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let indexDescriptorStore = AsyncStore<Descriptor>()
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try await contentStore.ingest { ingestPath in
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var descriptors = [Descriptor]()
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let writer = try ContentWriter(for: ingestPath)
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for kernel in binaries {
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var result = try writer.create(from: kernel.path)
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let platform = kernel.platform.ociPlatform()
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let layerDescriptor = Descriptor(
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mediaType: mediaType,
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digest: result.digest.digestString,
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size: result.size,
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platform: platform)
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let rootfsConfig = ContainerizationOCI.Rootfs(type: "layers", diffIDs: [result.digest.digestString])
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let runtimeConfig = ContainerizationOCI.ImageConfig(labels: labels)
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let imageConfig = ContainerizationOCI.Image(architecture: platform.architecture, os: platform.os, config: runtimeConfig, rootfs: rootfsConfig)
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result = try writer.create(from: imageConfig)
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let configDescriptor = Descriptor(mediaType: ContainerizationOCI.MediaTypes.imageConfig, digest: result.digest.digestString, size: result.size)
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let manifest = Manifest(config: configDescriptor, layers: [layerDescriptor])
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result = try writer.create(from: manifest)
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let manifestDescriptor = Descriptor(
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mediaType: ContainerizationOCI.MediaTypes.imageManifest, digest: result.digest.digestString, size: result.size, platform: platform)
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descriptors.append(manifestDescriptor)
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}
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let index = ContainerizationOCI.Index(manifests: descriptors)
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let result = try writer.create(from: index)
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let indexDescriptor = Descriptor(mediaType: ContainerizationOCI.MediaTypes.index, digest: result.digest.digestString, size: result.size)
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await indexDescriptorStore.set(indexDescriptor)
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}
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guard let indexDescriptor = await indexDescriptorStore.get() else {
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throw ContainerizationError(.notFound, message: "image for \(reference) not found")
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}
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let description = Image.Description(reference: reference, descriptor: indexDescriptor)
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let image = try await imageStore.create(description: description)
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return KernelImage(image: image)
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}
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}
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