这是indexloc提供的服务，不要输入任何密码
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Don't download IPSWs into memory #262

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Merged
merged 1 commit into from
Oct 6, 2022
Merged

Don't download IPSWs into memory #262

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45 changes: 23 additions & 22 deletions Sources/tart/VM.swift
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import Foundation
import Virtualization
import AsyncAlgorithms

struct UnsupportedRestoreImageError: Error {
}
Expand Down Expand Up @@ -62,12 +63,9 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {

static func retrieveIPSW(remoteURL: URL) async throws -> URL {
// Check if we already have this IPSW in cache
var request = URLRequest(url: remoteURL)
request.httpMethod = "HEAD"
let (_, response) = try await URLSession.shared.data(for: request)
let httpURLResponse = response as! HTTPURLResponse
let (bytes, response) = try await URLSession.shared.bytes(from: remoteURL)

if let hash = httpURLResponse.value(forHTTPHeaderField: "x-amz-meta-digest-sha256") {
if let hash = (response as! HTTPURLResponse).value(forHTTPHeaderField: "x-amz-meta-digest-sha256") {
let ipswLocation = try IPSWCache().locationFor(fileName: "sha256:\(hash).ipsw")

if FileManager.default.fileExists(atPath: ipswLocation.path) {
Expand All @@ -81,26 +79,29 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
// Download the IPSW
defaultLogger.appendNewLine("Fetching \(remoteURL.lastPathComponent)...")

let data: Data = try await withCheckedThrowingContinuation { continuation in
let downloadedTask = URLSession.shared.dataTask(with: remoteURL) { data, response, error in
if error != nil {
continuation.resume(throwing: error!)
return
}
if (data == nil) {
continuation.resume(throwing: DownloadFailed())
return
}
continuation.resume(returning: data!)
}
ProgressObserver(downloadedTask.progress).log(defaultLogger)
downloadedTask.resume()
let progress = Progress(totalUnitCount: response.expectedContentLength)
ProgressObserver(progress).log(defaultLogger)

let temporaryLocation = try Config().tartTmpDir.appendingPathComponent(UUID().uuidString + ".ipsw")
FileManager.default.createFile(atPath: temporaryLocation.path, contents: nil)
let lock = try FileLock(lockURL: temporaryLocation)
try lock.lock()

let fileHandle = try FileHandle(forWritingTo: temporaryLocation)
let digest = Digest()

for try await chunk in bytes.chunks(ofCount: chunkSizeBytes) {
let chunkAsData = Data(chunk)
fileHandle.write(chunkAsData)
digest.update(chunkAsData)
progress.completedUnitCount += Int64(chunk.count)
}

let ipswLocation = try IPSWCache().locationFor(fileName: Digest.hash(data) + ".ipsw")
try data.write(to: ipswLocation, options: [.atomic])
try fileHandle.close()

let finalLocation = try IPSWCache().locationFor(fileName: digest.finalize() + ".ipsw")

return ipswLocation
return try FileManager.default.replaceItemAt(finalLocation, withItemAt: temporaryLocation)!
}

static func latestIPSWURL() async throws -> URL {
Expand Down