Change FileExists to return tensorflow::Status.

Also done separately by @llhe at github.com/tensorflow/tensorflow/pull/5370. We needed to do this change internally to fix all callers.

Motivation: The existing FileExists interface doesn't allow callers to distinguish between file not found vs. filesystem errors.

Semantics changes:
- gfile.Exists in Python now throws an exception for filesystem errors. It continues to return true/false if it can accurately determine whether a file exists.
- RecursivelyCreateDir now returns errors for filesystem errors when calling FileExists.
Change: 138224013

1 files changed, 1 insertions, 1 deletions

diff --git a/tensorflow/core/util/reporter.cc b/tensorflow/core/util/reporter.cc
index a7e4b48175..c4896fe2ac 100644
--- a/tensorflow/core/util/reporter.cc
+++ b/tensorflow/core/util/reporter.cc
@@ -54,7 +54,7 @@ Status TestReporter::Initialize() {
   string mangled_fname = strings::StrCat(
       fname_, str_util::Join(str_util::Split(test_name_, '/'), "__"));
   Env* env = Env::Default();
-  if (env->FileExists(mangled_fname)) {
+  if (env->FileExists(mangled_fname).ok()) {
     return errors::InvalidArgument("Cannot create TestReporter, file exists: ",
                                    mangled_fname);
   }