dependencies: Move dependency downloader into shared project

backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -33,28 +33,9 @@ import org.jetbrains.kotlin.config.addKotlinSourceRoots
 import org.jetbrains.kotlin.konan.target.CompilerOutputKind
 import org.jetbrains.kotlin.konan.target.TargetManager
 import org.jetbrains.kotlin.utils.KotlinPaths
+import java.io.File
 import kotlin.reflect.KFunction
 
-// TODO: Don't use reflection?
-private fun maybeExecuteHelper(targetName: String) {
-    try {
-        val kClass = Class.forName("org.jetbrains.kotlin.konan.Helper0").kotlin
-        @Suppress("UNCHECKED_CAST")
-        val ctor = kClass.constructors.single() as KFunction<Runnable>
-        val distribution = Distribution(TargetManager(targetName))
-        val result = ctor.call(
-                distribution.dependenciesDir,
-                distribution.properties,
-                distribution.dependencies
-        )
-        result.run()
-    } catch (notFound: ClassNotFoundException) {
-        // Just ignore, no helper.
-    } catch (e: Throwable) {
-        throw IllegalStateException("Cannot download dependencies.", e)
-    }
-}
-
 class K2Native : CLICompiler<K2NativeCompilerArguments>() {
 
     override fun doExecute(@NotNull arguments: K2NativeCompilerArguments, @NotNull configuration: CompilerConfiguration, @NotNull rootDisposable: Disposable, @Nullable paths: KotlinPaths?): ExitCode {
@@ -85,7 +66,6 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
         return this?.asList<String>() ?: listOf<String>()
     }
 
-
     // It is executed before doExecute().
     override fun setupPlatformSpecificArgumentsAndServices(
             configuration: CompilerConfiguration,
@@ -152,8 +132,6 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
                 put(ENABLE_ASSERTIONS, arguments.enableAssertions)
             }
         }
-
-        maybeExecuteHelper(arguments.target ?: "host")
     }
 
     override fun createArguments(): K2NativeCompilerArguments {

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/Helper0.kt

@@ -18,11 +18,11 @@
 // Example startup helper for Kotlin N compiler. Compile to JAR and add it to
 // Kotlin N classpath - it will get loaded and executed automatically.
 //
-package org.jetbrains.kotlin.konan
+package org.jetbrains.kotlin.konan.util
 
 import java.util.*
 
-// Name it CompilerHelper0 so that it get loaded.
+// Name it Helper0 so that it get loaded.
 class Helper0Disabled(val dependenciesDir: String,
                       val properties: Properties,
                       val dependencies: List<String>) : Runnable {

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanConfig.kt

@@ -33,6 +33,7 @@ import org.jetbrains.kotlin.konan.file.File
 import org.jetbrains.kotlin.konan.target.*
 import org.jetbrains.kotlin.konan.target.TargetManager.*
 import org.jetbrains.kotlin.konan.target.CompilerOutputKind.*
+import org.jetbrains.kotlin.konan.util.DependencyProcessor
 
 class KonanConfig(val project: Project, val configuration: CompilerConfiguration) {
 
@@ -47,9 +48,16 @@ class KonanConfig(val project: Project, val configuration: CompilerConfiguration
             error("Target $target is not available on the ${TargetManager.host} host")
         }
     }
+
+    private fun Distribution.prepareDependencies() {
+        DependencyProcessor(java.io.File(dependenciesDir), targetProperties).run()
+    }
+
     internal val distribution = Distribution(targetManager, 
-        configuration.get(KonanConfigKeys.PROPERTY_FILE), 
-        configuration.get(KonanConfigKeys.RUNTIME_FILE))
+        configuration.get(KonanConfigKeys.PROPERTY_FILE),
+        configuration.get(KonanConfigKeys.RUNTIME_FILE)).apply {
+        prepareDependencies()
+    }
 
     private val produce = configuration.get(KonanConfigKeys.PRODUCE)!!
     private val suffix = produce.suffix(targetManager.target)

backend.native/konan.properties

@@ -22,7 +22,8 @@ dependenciesUrl = http://download.jetbrains.com/kotlin/native
 airplaneMode = false
 
 downloadingAttempts = 10
-downloadingAttemptPauseMs = 3000
+downloadingAttemptIntervalMs = 3000
+homeDependencyCache = .konan/cache
 
 llvmDebugOptFlags = -O0