improved error message

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@24899 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/FilePath.java

@@ -669,7 +669,7 @@ public final class FilePath implements Serializable {
                 throw e;    // pass through so that the caller can catch it as AbortException
             } catch (IOException e) {
                 // wrap it into a new IOException so that we get the caller's stack trace as well.
-                throw new IOException2("remote file operation failed",e);
+                throw new IOException2("remote file operation failed: "+remote+" at "+channel,e);
             }
         } else {
             // the file is on the local machine.