Stop the silly deleteDir call.
diff --git a/vars/functions.groovy b/vars/functions.groovy
index cd60d55..6e02edc 100644
--- a/vars/functions.groovy
+++ b/vars/functions.groovy
@@ -95,8 +95,6 @@
             dir(sourcePath) {
                 stage('Init') {
                     container('debian') {
-                        sh 'echo ==================== directory contents; ls'
-                        deleteDir()
                         initSourceTree(boardName, needsNative)
                     }
                 }