Revert "[K/N][build] Cleanup obsolete build tasks"

This reverts commit a9cae3fe87.

kotlin-native/tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/experimental/internal/KotlinNativePlatform.kt

@@ -1,6 +1,17 @@
 /*
- * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
- * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ * Copyright 2010-2018 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package org.jetbrains.kotlin.gradle.plugin.experimental.internal

kotlin-native/tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/konan/KonanPlugin.kt

@@ -355,6 +355,7 @@ class KonanPlugin @Inject constructor(private val registry: ToolingModelBuilderR
         project.plugins.apply("base")
         project.plugins.apply("java")
         // Create necessary tasks and extensions.
+        project.tasks.create(KONAN_DOWNLOAD_TASK_NAME, KonanCompilerDownloadTask::class.java)
         project.extensions.create(KONAN_EXTENSION_NAME, KonanExtension::class.java)
         val container = project.extensions.create(
                 KonanArtifactContainer::class.java,

kotlin-native/tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/konan/tasks/KonanCompilerDownloadTask.kt

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2010-2017 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.gradle.plugin.tasks
+
+import org.gradle.api.DefaultTask
+import org.gradle.api.GradleScriptException
+import org.gradle.api.tasks.Internal
+import org.gradle.api.tasks.TaskAction
+import org.jetbrains.kotlin.gradle.plugin.konan.*
+import org.jetbrains.kotlin.konan.MetaVersion
+import org.jetbrains.kotlin.konan.util.DependencyProcessor
+import org.jetbrains.kotlin.konan.util.DependencySource
+import java.io.IOException
+import org.jetbrains.kotlin.*
+
+open class KonanCompilerDownloadTask : DefaultTask() {
+
+    internal companion object {
+        internal const val BASE_DOWNLOAD_URL = "https://download.jetbrains.com/kotlin/native/builds"
+    }
+
+    /**
+     * If true the task will also download dependencies for targets specified by the konan.targets project extension.
+     */
+    @Internal
+    var downloadDependencies: Boolean = false
+
+    @TaskAction
+    fun downloadAndExtract() {
+        if (!project.hasProperty(KonanPlugin.ProjectProperty.DOWNLOAD_COMPILER)) {
+            val konanHome = project.kotlinNativeDist
+            logger.info("Use a user-defined compiler path: $konanHome")
+        } else {
+            try {
+                val downloadUrlDirectory = buildString {
+                    append("$BASE_DOWNLOAD_URL/")
+                    val version = project.konanVersion
+                    if (version.contains("-dev-")) append("dev/") else append("releases/")
+                    append("$version/")
+                    append(project.simpleOsName)
+                }
+                val konanCompiler = project.konanCompilerName()
+                val parentDir = DependencyProcessor.localKonanDir
+                logger.info("Downloading Kotlin/Native compiler from $downloadUrlDirectory/$konanCompiler into $parentDir")
+                DependencyProcessor(
+                        parentDir,
+                        downloadUrlDirectory,
+                        mapOf(konanCompiler to listOf(DependencySource.Remote.Public))
+                ).run()
+            } catch (e: IOException) {
+                throw GradleScriptException("Cannot download Kotlin/Native compiler", e)
+            }
+        }
+
+        // Download dependencies if a user said so.
+        if (downloadDependencies) {
+            val runner = KonanCliCompilerRunner(project, project.konanExtension.jvmArgs)
+            project.konanTargets.forEach {
+                runner.run("-Xcheck_dependencies", "-target", it.visibleName)
+            }
+        }
+    }
+}