debugging swiftpm plugin + subprocess hangs

Author: ktoso

Package.swift

@@ -187,11 +187,11 @@ let package = Package(
         .swiftLanguageMode(.v5),
         .unsafeFlags(["-I\(javaIncludePath)", "-I\(javaPlatformIncludePath)"]),
       ]
-//      // FIXME: when the tool is run from plugin it hangs even if sandbox is disabled
-//      ,
-//      plugins: [
-//        "SwiftJavaBootstrapJavaPlugin",
-//      ]
+      // FIXME: when the tool is run from plugin it hangs even if sandbox is disabled
+      ,
+      plugins: [
+        "SwiftJavaBootstrapJavaPlugin",
+      ]
     ),
 
     .target(

Samples/JavaDependencySampleApp/ci-validate.sh

@@ -3,10 +3,4 @@
 set -e
 set -x
 
-# TODO: this is a workaround for build plugins getting stuck running the bootstrap plugin
-cd ../../
-swift build --product SwiftJavaBootstrapJavaTool
-.build/debug/SwiftJavaBootstrapJavaTool --fetch Sources/JavaKitDependencyResolver/swift-java.config --module-name JavaKitDependencyResolver --output-directory .build/plugins/outputs/swift-java/JavaKitDependencyResolver/destination/SwiftJavaBootstrapJavaPlugin
-
-cd -
 swift run --disable-sandbox

Sources/SwiftJavaBootstrapJavaTool/SwiftJavaBootstrapJavaTool.swift

@@ -17,6 +17,7 @@ import Synchronization
 import JavaKitConfigurationShared
 import Dispatch
 import _Subprocess
+import System
 
 @available(macOS 15.0, *)
 @main
@@ -67,45 +68,48 @@ final class SwiftJavaBootstrapJavaTool {
         "--rerun-tasks",
   //      "--debug",
   //      "\(localGradleProjectDependencyName):jar",
-        "\(localGradleProjectDependencyName):\(printRuntimeClasspathTaskName)"
-      ]
+        "\(localGradleProjectDependencyName):\(printRuntimeClasspathTaskName)",
+      ],
+      output: .writeTo(.open("/tmp/out.txt", .writeOnly), closeAfterSpawningProcess: true),
+      error: .writeTo(.open("/tmp/err.txt", .writeOnly), closeAfterSpawningProcess: true)
     )
 
-    let outString = String(
-        data: process.standardOutput,
-        encoding: .utf8
-    )
-    let errString = String(
-      data: process.standardError,
-        encoding: .utf8
-    )
-    
-    print("OUT ==== \(outString?.count) ::: \(outString ?? "")")
-    print("ERR ==== \(errString?.count) ::: \(errString ?? "")")
-    
-    let classpathOutput: String
-    if let found = outString?.split(separator: "\n").first(where: { $0.hasPrefix(self.SwiftJavaClasspathPrefix) }) {
-      classpathOutput = String(found)
-    } else if let found = errString?.split(separator: "\n").first(where: { $0.hasPrefix(self.SwiftJavaClasspathPrefix) }) {
-      classpathOutput = String(found)
-    } else {
-      let suggestDisablingSandbox = "It may be that the Sandbox has prevented dependency fetching, please re-run with '--disable-sandbox'."
-      fatalError("Gradle output had no SWIFT_JAVA_CLASSPATH! \(suggestDisablingSandbox). \n" +
-                 "Output was:<<<\(outString ?? "<empty>")>>>; Err was:<<<\(errString ?? "<empty>")>>>")
-    }
-    
-    let classpathString = String(classpathOutput.dropFirst(self.SwiftJavaClasspathPrefix.count))
-
-    _ = try? FileManager.default.createDirectory(
-      at: URL(fileURLWithPath: outputDirectoryPath),
-      withIntermediateDirectories: true,
-      attributes: nil
-    )
-
+//    let outString = String(
+//        data: process.standardOutput,
+//        encoding: .utf8
+//    )
+//    let errString = String(
+//      data: process.standardError,
+//        encoding: .utf8
+//    )
+//    
+//    print("OUT ==== \(outString?.count) ::: \(outString ?? "")")
+//    print("ERR ==== \(errString?.count) ::: \(errString ?? "")")
+//    
+//    let classpathOutput: String
+//    if let found = outString?.split(separator: "\n").first(where: { $0.hasPrefix(self.SwiftJavaClasspathPrefix) }) {
+//      classpathOutput = String(found)
+//    } else if let found = errString?.split(separator: "\n").first(where: { $0.hasPrefix(self.SwiftJavaClasspathPrefix) }) {
+//      classpathOutput = String(found)
+//    } else {
+//      let suggestDisablingSandbox = "It may be that the Sandbox has prevented dependency fetching, please re-run with '--disable-sandbox'."
+//      fatalError("Gradle output had no SWIFT_JAVA_CLASSPATH! \(suggestDisablingSandbox). \n" +
+//                 "Output was:<<<\(outString ?? "<empty>")>>>; Err was:<<<\(errString ?? "<empty>")>>>")
+//    }
+//    
+//    let classpathString = String(classpathOutput.dropFirst(self.SwiftJavaClasspathPrefix.count))
+//
+//    _ = try? FileManager.default.createDirectory(
+//      at: URL(fileURLWithPath: outputDirectoryPath),
+//      withIntermediateDirectories: true,
+//      attributes: nil
+//    )
+//
     let classpathOutputURL =
       URL(fileURLWithPath: outputDirectoryPath)
         .appendingPathComponent("\(moduleName).swift-java.classpath", isDirectory: false)
 
+    let classpathString = "MOCK"
     try! classpathString.write(to: classpathOutputURL, atomically: true, encoding: .utf8)
 
     print("[swift-java-bootstrap] Done, written classpath to: \(classpathOutputURL)")