Revert "Fix configuration cache for focus task and add a test for it"

This reverts commit 23a8b15.

focus-gradle-plugin/src/main/kotlin/com/dropbox/focus/CreateFocusSettingsTask.kt

@@ -1,47 +1,29 @@
 package com.dropbox.focus
 
-import java.io.Serializable
 import org.gradle.api.DefaultTask
 import org.gradle.api.Project
 import org.gradle.api.artifacts.ProjectDependency
 import org.gradle.api.file.RegularFileProperty
-import org.gradle.api.provider.Property
-import org.gradle.api.provider.SetProperty
-import org.gradle.api.tasks.Input
 import org.gradle.api.tasks.OutputFile
 import org.gradle.api.tasks.TaskAction
 import org.gradle.work.DisableCachingByDefault
 
 @DisableCachingByDefault(because = "Not worth caching")
 public abstract class CreateFocusSettingsTask : DefaultTask() {
 
-  @get:Input
-  protected abstract val projectDeps: SetProperty<DependentProjectInfo>
-
-  @get:Input
-  protected abstract val projectPath: Property<String>
-
   @get:OutputFile
   public abstract val settingsFile: RegularFileProperty
 
   @get:OutputFile
   public abstract val modulesToDirMapFile: RegularFileProperty
 
-  /**
-   * Project info required for focus.settings.gradle generation.
-   */
-  protected data class DependentProjectInfo(
-    public val path: String,
-    public val projectDir: String,
-  ): Serializable
-
   init {
     outputs.upToDateWhen { false }
   }
 
   @TaskAction
   public fun createFocusSettings() {
-    val dependencies = projectDeps.get().sortedBy { it.path }
+    val dependencies = project.collectDependencies().sortedBy { it.path }
 
     // generate CSV mapping from module name to its absolute path
     modulesToDirMapFile.get().asFile.writer().use { writer ->
@@ -55,7 +37,7 @@ public abstract class CreateFocusSettingsTask : DefaultTask() {
     }
 
     settingsFile.get().asFile.writer().use { writer ->
-      writer.write("// ${projectPath.get()} specific settings\n")
+      writer.write("// ${project.path} specific settings\n")
       writer.appendLine("//")
       writer.appendLine("// This file is autogenerated by the focus task. Changes will be overwritten.")
       writer.appendLine()
@@ -78,12 +60,11 @@ public abstract class CreateFocusSettingsTask : DefaultTask() {
     }
   }
 
-  private fun Project.collectDependencies(): Set<DependentProjectInfo> {
-    val result = mutableSetOf<DependentProjectInfo>()
+  private fun Project.collectDependencies(): Set<Project> {
+    val result = mutableSetOf<Project>()
     fun addDependent(project: Project) {
       val configuredProject = this.evaluationDependsOn(project.path)
-      val dep = DependentProjectInfo(project.path, project.projectDir.absolutePath)
-      if (result.add(dep)) {
+      if (result.add(configuredProject)) {
         configuredProject.configurations.forEach { config ->
           config.dependencies
             .filterIsInstance<ProjectDependency>()
@@ -102,10 +83,7 @@ public abstract class CreateFocusSettingsTask : DefaultTask() {
       group = FOCUS_TASK_GROUP
       settingsFile.set(subExtension.focusSettingsFile)
       modulesToDirMapFile.set(subExtension.moduleToDirMapFile)
-      projectPath.set(project.path)
-      // Collecting dependencies info in the configuration phase.
-      // Gradle disallows accessing project in execution phase.
-      projectDeps.set(project.collectDependencies())
+      notCompatibleWithConfigurationCache("This reads configurations from the project at action-time.")
     }
   }
 }

focus-gradle-plugin/src/test/kotlin/com/dropbox/focus/FocusPluginTest.kt

@@ -22,24 +22,7 @@ class FocusPluginTest {
   }
 
   @Test
-  fun configurationCache_focus() {
-    val fixtureRoot = File("src/test/projects/configuration-cache-compatible")
-
-    gradleRunner
-      .withArguments("--configuration-cache", "focus")
-      .withProjectDir(fixtureRoot)
-      .build()
-
-    val result = gradleRunner
-      .withArguments("--configuration-cache", "focus")
-      .withProjectDir(fixtureRoot)
-      .build()
-
-    assertThat(result.output).contains("Reusing configuration cache.")
-  }
-
-  @Test
-  fun configurationCache_clear() {
+  fun configurationCache() {
     val fixtureRoot = File("src/test/projects/configuration-cache-compatible")
 
     gradleRunner