wehub-resource-sync
86 lines
4.2 KiB
Swift
86 lines
4.2 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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/// Data representing the image to use as the root filesystem for a virtual machine.
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/// Typically this image would contain the guest agent used to facilitate container
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/// workloads, as well as any extras that may be useful to have in the guest.
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public struct InitImage: Sendable {
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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 InitImage {
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/// Unpack the initial filesystem for the desired platform at a given path.
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public func initBlock(at: URL, for platform: SystemPlatform) async throws -> Mount {
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let unpacker = EXT4Unpacker(blockSizeInBytes: 512.mib())
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var fs = try await unpacker.unpack(self.image, for: platform.ociPlatform(), at: at)
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fs.options = ["ro"]
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return fs
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}
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/// Create a new InitImage with the reference as the name.
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/// The `rootfs` parameter must be a tar.gz file whose contents make up the filesystem for the image.
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public static func create(
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reference: String, rootfs: URL, platform: Platform,
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labels: [String: String] = [:], imageStore: ImageStore, contentStore: ContentStore
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) async throws -> InitImage {
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let indexDescriptorStore = AsyncStore<Descriptor>()
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try await contentStore.ingest { dir in
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let writer = try ContentWriter(for: dir)
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var result = try writer.create(from: rootfs)
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let layerDescriptor = Descriptor(mediaType: ContainerizationOCI.MediaTypes.imageLayerGzip, digest: result.digest.digestString, size: result.size)
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// TODO: compute and fill in the correct diffID for the above layer
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// We currently put in the sha of the fully compressed layer, this needs to be replaced with
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// the sha of the uncompressed layer.
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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(mediaType: ContainerizationOCI.MediaTypes.imageManifest, digest: result.digest.digestString, size: result.size, platform: platform)
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let index = ContainerizationOCI.Index(manifests: [manifestDescriptor])
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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 InitImage(image: image)
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}
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}
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