Incorrect stdout formatting: FileOutputStream object printed instead of compose output file

When running integration tests using the gradle-docker-compose-plugin, the plugin fails with an unhelpful error message. Specifically, the stdout field in the exception references a java.io.FileOutputStream object rather than the actual path or contents of the compose output file. This makes debugging significantly harder, as the output file location or contents are not accessible from the console.

Environment

Gradle version: 8.13 Plugin version: 0.17.16 Java version: 21 OS: linux

Error Output

FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':integration-tests:composeUp'.
> Exit-code 1 when calling docker-compose, stdout: java.io.FileOutputStream@61051e6f

* Try:
> Run with --scan to get full insights.
> Get more help at https://help.gradle.org.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':integration-tests:composeUp'.
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:130)
  at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:293)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:128)
  at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:116)
  at org.gradle.api.internal.tasks.execution.ProblemsTaskPathTrackingTaskExecuter.execute(ProblemsTaskPathTrackingTaskExecuter.java:41)
  at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
  at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
  at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
  at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:74)
  at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
  at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:210)
  at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:205)
  at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:67)
  at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:60)
  at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:167)
  at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:60)
  at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:54)
  at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
  at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:42)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:331)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:318)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.lambda$execute$0(DefaultTaskExecutionGraph.java:314)
  at org.gradle.internal.operations.CurrentBuildOperationRef.with(CurrentBuildOperationRef.java:85)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:314)
  at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:303)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:459)
  at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:376)
  at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
  at org.gradle.internal.concurrent.AbstractManagedExecutor$1.run(AbstractManagedExecutor.java:48)
Caused by: java.lang.RuntimeException: Exit-code 1 when calling docker-compose, stdout: java.io.FileOutputStream@61051e6f
  at org.gradle.internal.instrumentation.api.groovybytecode.MethodHandleInvocation.callNext(MethodHandleInvocation.java:64)
  at org.gradle.internal.classpath.intercept.DefaultCallSiteDecorator$1.intercept(DefaultCallSiteDecorator.java:88)
  at org.gradle.internal.instrumentation.api.groovybytecode.AbstractCallInterceptor.interceptMethodHandle(AbstractCallInterceptor.java:61)
  at com.avast.gradle.dockercompose.ComposeExecutor.executeWithCustomOutput(ComposeExecutor.groovy:114)
  at com.avast.gradle.dockercompose.ComposeExecutor.executeWithCustomOutputWithExitValue(ComposeExecutor.groovy:71)
  at com.avast.gradle.dockercompose.tasks.ComposeUp.up(ComposeUp.groovy:145)

Expected Behavior

The plugin should print the actual path to the compose output file

Actual Behavior

Instead of a usable path or content, the plugin prints the toString() representation of the FileOutputStream object, which is not actionable.

Suggested Fix

Ensure that the plugin extracts and prints the file path or contents from the FileOutputStream rather than its object reference.