Disallow unsafe reads of KPM PluginData from Compile Task

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KpmCompilerPluginIT.kt

@@ -10,6 +10,12 @@ import kotlin.test.assertTrue
 
 class KpmCompilerPluginIT : BaseGradleIT() {
 
+    /**
+     * Gradle implementation of KPM uses features of 6.4+ version
+     */
+    override val defaultGradleVersion: GradleVersionRequired
+        get() = GradleVersionRequired.AtLeast("6.4")
+
     @Test
     fun testTransientPluginOptions() {
         val project = transformProjectWithPluginsDsl("kpmTransientPluginOptions")

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/mpp/KpmCompilerPluginTest.kt

@@ -118,6 +118,26 @@ class KpmCompilerPluginTest {
         assertEquals(1, pluginDataObtainCount)
     }
 
+    @Test
+    fun `it should not be possible to read plugin data during configuration phase`() {
+        val project = buildProjectWithKPM {
+            plugins.apply(TestPluginWithListeners::class.java)
+
+            projectModel {
+                main {
+                    jvm
+                }
+            }
+
+            // Getting task shouldn't fail due to laziness
+            val task = tasks.getByName("compileKotlinJvm") as AbstractKotlinCompile<*>
+            // But trying to get pluginData during "configuration" should fail
+            assertFailsWith<IllegalStateException> { task.kotlinPluginData!!.get() }
+        }
+
+        project.evaluate()
+    }
+
     private fun Project.pluginDataOfTask(taskName: String) = this
         .tasks
         .getByName(taskName)

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/pm20/GradleKpmCompilerPlugin.kt

@@ -42,7 +42,7 @@ private fun Project.compilerPluginDataProvider(
         val builder = CompilerPluginOptionsBuilder(project, configurationName)
         builder += pluginDataList()
         builder.build()
-    }.apply { finalizeValueOnRead() }
+    }.apply { disallowUnsafeRead() }
 }
 
 internal class CompilerPluginOptionsBuilder(