fix GlobalLock behavior when lock file's directory does not exist

launch/Locks.scala

@@ -9,7 +9,12 @@ object Locks extends xsbti.GlobalLock
 {
 	private[this] val locks = new Cache[File, GlobalLock](new GlobalLock(_))
 	def apply[T](file: File, action: Callable[T]): T =
-		synchronized { locks(file.getCanonicalFile).withLock(action) }
+		synchronized
+		{
+			file.getParentFile.mkdirs()
+			file.createNewFile()
+			locks(file.getCanonicalFile).withLock(action)
+		}
 
 	private[this] class GlobalLock(file: File)
 	{

launch/src/test/scala/LocksTest.scala

@@ -0,0 +1,14 @@
+package xsbt.boot
+
+import org.scalacheck._
+import Prop._
+import java.io.File
+
+object LocksTest extends Properties("Locks")
+{
+	property("Lock in nonexisting directory") = 
+		FileUtilities.withTemporaryDirectory { dir =>
+			val lockFile = new File(dir, "doesntexist/lock")
+			Locks(lockFile, new java.util.concurrent.Callable[Boolean] { def call = true })
+		}
+}