Include 'cause' in re-thrown exceptions

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1002698 13f79535-47bb-0310-9956-ffa450edef68

Author: Niall Pemberton

src/java/org/apache/commons/io/FileSystemUtils.java

@@ -448,9 +448,9 @@ long parseBytes(String freeSpace, String path) throws IOException {
             return bytes;
 
         } catch (NumberFormatException ex) {
-            throw new IOException(
+            throw new IOExceptionWithCause(
                     "Command line '" + DF + "' did not return numeric data as expected " +
-                    "for path '" + path + "'- check path is valid");
+                    "for path '" + path + "'- check path is valid", ex);
         }
     }
 
@@ -515,9 +515,9 @@ List<String> performCommand(String[] cmdAttribs, int max, long timeout) throws I
             return lines;
 
         } catch (InterruptedException ex) {
-            throw new IOException(
-                    "Command line threw an InterruptedException '" + ex.getMessage() +
-                    "' for command " + Arrays.asList(cmdAttribs));
+            throw new IOExceptionWithCause(
+                    "Command line threw an InterruptedException " +
+                    "for command " + Arrays.asList(cmdAttribs) + " timeout=" + timeout, ex);
         } finally {
             IOUtils.closeQuietly(in);
             IOUtils.closeQuietly(out);