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https://github.com/apple/container.git
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Kathryn Baldauf
16f2630126
We're working on making a pure swift container image build system that leverages containerization. This PR represents our initial design and initial work towards this goal. The native builder is still in active development and most of the implementation has not been started or completed. We will be opening a series of issues that represent various (but not necessarily all) pieces of work that need to be done here. There are docs included in this PR that describe the overall design of each component and outline some of our goals. The easiest way to view the docs by themselves (since this is a massive PR) is to look at the docs commit in the `Commits` tab. We'd love any feedback! @wlan0 --------- Signed-off-by: Kathryn Baldauf <k_baldauf@apple.com>
73 lines
2.6 KiB
Swift
73 lines
2.6 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2025 Apple Inc. and the container project authors. All rights reserved.
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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 ContainerBuildIR
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import ContainerBuildSnapshotter
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import Foundation
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/// A protocol for computing differences between filesystem snapshots.
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public protocol Differ: Sendable {
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/// Compute the difference between two snapshots.
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///
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/// - Parameters:
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/// - from: The base snapshot
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/// - to: The target snapshot
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/// - Returns: The filesystem changes needed to transform `from` into `to`
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func diff(from: Snapshot?, to: Snapshot) async throws -> FilesystemChanges
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/// Compute a digest representing the state of a filesystem path.
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///
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/// - Parameter path: The filesystem path to digest
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/// - Returns: A digest representing the current state
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func digest(path: String) async throws -> Digest
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}
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/// A basic in-memory differ implementation.
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public struct MemoryDiffer: Differ {
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public init() {}
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public func diff(from base: Snapshot?, to target: Snapshot) async throws -> FilesystemChanges {
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// Stub implementation
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// In a real implementation, this would:
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// 1. Mount or access both snapshots
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// 2. Walk the filesystem trees
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// 3. Compare files, directories, and metadata
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// 4. Return the differences
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FilesystemChanges(
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added: Set<String>(),
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modified: Set<String>(),
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deleted: Set<String>(),
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sizeChange: 0
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)
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}
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public func digest(path: String) async throws -> Digest {
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// Stub implementation
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// In a real implementation, this would compute a merkle tree
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// digest of the filesystem at the given path
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var digestBytes = Data(count: 32)
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digestBytes.withUnsafeMutableBytes { bytes in
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if let baseAddress = bytes.baseAddress {
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memset(baseAddress, 0, 32)
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}
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}
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return try Digest(algorithm: .sha256, bytes: digestBytes)
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}
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}
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