mirror of
https://github.com/apple/container.git
synced 2026-08-31 12:55:45 +00:00
Saehej Kang
da8bec6223
- When container is not running, the runtime helper traverses the container's root fs and writes it to the specified tar archive or stdout. - When the container is running, the helper performs the same operation but wraps it in freeze/thaw to ensure data integrity for the resulting archive.
79 lines
3.1 KiB
Swift
79 lines
3.1 KiB
Swift
//===----------------------------------------------------------------------===//
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// Copyright © 2026 Apple Inc. and the container 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 ArgumentParser
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import ContainerAPIClient
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import ContainerizationError
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import Foundation
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import TerminalProgress
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extension Application {
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public struct ContainerExport: AsyncLoggableCommand {
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public init() {}
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public static var configuration: CommandConfiguration {
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CommandConfiguration(
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commandName: "export",
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abstract: "Export a container's filesystem as a tar archive",
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)
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}
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@OptionGroup
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public var logOptions: Flags.Logging
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@Option(
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name: .shortAndLong, help: "Pathname for the saved container filesystem (defaults to stdout)", completion: .file(),
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transform: { str in
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URL(fileURLWithPath: str, relativeTo: .currentDirectory()).absoluteURL.path(percentEncoded: false)
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})
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var output: String?
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@Argument(help: "container ID")
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var id: String
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public func run() async throws {
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let client = ContainerClient()
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let tempDir = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
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try FileManager.default.createDirectory(at: tempDir, withIntermediateDirectories: true)
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defer {
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try? FileManager.default.removeItem(at: tempDir)
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}
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let archive = tempDir.appendingPathComponent("archive.tar")
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try await client.export(id: id, archive: archive)
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if output == nil {
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guard let fileHandle = try? FileHandle(forReadingFrom: archive) else {
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throw ContainerizationError(.internalError, message: "unable to open archive for reading")
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}
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let bufferSize = 4096
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while true {
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let chunk = fileHandle.readData(ofLength: bufferSize)
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if chunk.isEmpty { break }
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FileHandle.standardOutput.write(chunk)
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}
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try fileHandle.close()
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} else {
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let outputURL = URL(fileURLWithPath: output!)
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if FileManager.default.fileExists(atPath: outputURL.path(percentEncoded: false)) {
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try FileManager.default.removeItem(at: outputURL)
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}
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try FileManager.default.moveItem(at: archive, to: outputURL)
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}
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}
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}
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}
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