[ArgsResolver] Create specified temporary directory, if necessary

Resolves rdar://157302464

Author: artemcm

Sources/SwiftDriver/Execution/ArgsResolver.swift

@@ -45,6 +45,10 @@ public final class ArgsResolver {
 
  if let temporaryDirectory = temporaryDirectory {
  self.temporaryDirectory = temporaryDirectory
+ let temporaryDirExists = try fileSystem.exists(self.temporaryDirectory)
+ if !temporaryDirExists, let temporaryDirAbsPath = self.temporaryDirectory.absolutePath {
+ try fileSystem.createDirectory(temporaryDirAbsPath, recursive: true)
+ }
  } else {
  // FIXME: withTemporaryDirectory uses FileManager.default, need to create a FileSystem.temporaryDirectory api.
  let tmpDir: AbsolutePath = try withTemporaryDirectory(removeTreeOnDeinit: false) { path in

Tests/SwiftDriverTests/SwiftDriverTests.swift

@@ -1783,6 +1783,29 @@ final class SwiftDriverTests: XCTestCase {
  XCTAssertTrue(contents.hasPrefix("-interpret\n\(source.nativePathString(escaped: false))"))
  }
 
+ // Forced response file in a non-existing temporary directory
+ do {
+ try withTemporaryDirectory { tempPath in
+ let resolverTempDirPath = tempPath.appending(components: "resolverStuff")
+ let source = try AbsolutePath(validating: "/foo.swift")
+ var driver = try Driver(args: ["swift"] + [source.nativePathString(escaped: false)])
+ let jobs = try driver.planBuild()
+ XCTAssertEqual(jobs.count, 1)
+ XCTAssertEqual(jobs[0].kind, .interpret)
+ let interpretJob = jobs[0]
+ let resolver = try ArgsResolver(fileSystem: localFileSystem,
+ temporaryDirectory: .absolute(resolverTempDirPath))
+ let resolvedArgs: [String] = try resolver.resolveArgumentList(for: interpretJob, useResponseFiles: .forced)
+ XCTAssertEqual(resolvedArgs.count, 3)
+ XCTAssertEqual(resolvedArgs[1], "-frontend")
+ XCTAssertEqual(resolvedArgs[2].first, "@")
+ let responseFilePath = try AbsolutePath(validating: String(resolvedArgs[2].dropFirst()))
+ XCTAssertEqual(responseFilePath.parentDirectory.basename, "resolverStuff")
+ let contents = try localFileSystem.readFileContents(responseFilePath).description
+ XCTAssertTrue(contents.hasPrefix("-interpret\n\(source.nativePathString(escaped: false))"))
+ }
+ }
+
  // No response file
  do {
  var driver = try Driver(args: ["swift"] + ["foo.swift"])