tree b173d09dc75a9daae4b636d3b234a8b3a20d7abc
parent 9363e7d69eff78c66dd80ff2590916c96898573a
author Alex Deymo <deymo@google.com> 1481254981 -0800
committer Alex Deymo <deymo@google.com> 1481255628 -0800

Make FileWriter errors verbose.

Print the errno message whenever there's a failure in the underlying
write function.

Bug: 32943635
Test: delta_generator --payload /path/to/nonexistent/place
Change-Id: Iba2961b7b7cd523ed5e651f6025f1d8e5f5e00a2