Explicitly verify that source exists

1 files changed, 3 insertions, 1 deletions

diff --git a/vespajlib/src/main/java/com/yahoo/io/IOUtils.java b/vespajlib/src/main/java/com/yahoo/io/IOUtils.java
index df432e4f787..54cdf5c7b40 100644
--- a/vespajlib/src/main/java/com/yahoo/io/IOUtils.java
+++ b/vespajlib/src/main/java/com/yahoo/io/IOUtils.java
@@ -227,7 +227,9 @@ public abstract class IOUtils {
      * @throws IOException if copying any file fails. This will typically result in some files being copied and
      *         others not, i.e this method is not exception safe
      */
-    public static void copyDirectory(File sourceLocation , File targetLocation, int maxRecurseLevel, FilenameFilter filter) throws IOException {
+    public static void copyDirectory(File sourceLocation, File targetLocation, int maxRecurseLevel, FilenameFilter filter) throws IOException {
+        if ( ! sourceLocation.exists()) throw new IllegalArgumentException(sourceLocation.getAbsolutePath() + " does not exist");
+
         if ( ! sourceLocation.isDirectory()) { // copy file
             InputStream in=null;
             OutputStream out=null;