[fsp] Do not allow write operations on read only file systems.

chrome/browser/chromeos/file_system_provider/operations/create_file_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/file_system_provider/operations/create_file.h"
 
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
@@ skipping 83 matching lines @@
                          file_system_info_,
                          base::FilePath::FromUTF8Unsafe(kFilePath),
                          base::Bind(&util::LogStatusCallback, &callback_log));
   create_file.SetDispatchEventImplForTesting(
       base::Bind(&util::LoggingDispatchEventImpl::OnDispatchEventImpl,
                  base::Unretained(&dispatcher)));
 
   EXPECT_FALSE(create_file.Execute(kRequestId));
 }
 
+TEST_F(FileSystemProviderOperationsCreateFileTest, Execute_ReadOnly) {
+  util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
+  util::StatusCallbackLog callback_log;
+
+  const ProvidedFileSystemInfo read_only_file_system_info(
+      kExtensionId,
+      kFileSystemId,
+      "" /* file_system_name */,
+      false /* writable */,
+      base::FilePath() /* mount_path */);
+
+  CreateFile create_file(NULL,
+                         read_only_file_system_info,
+                         base::FilePath::FromUTF8Unsafe(kFilePath),
+                         base::Bind(&util::LogStatusCallback, &callback_log));
+  create_file.SetDispatchEventImplForTesting(
+      base::Bind(&util::LoggingDispatchEventImpl::OnDispatchEventImpl,
+                 base::Unretained(&dispatcher)));
+
+  EXPECT_FALSE(create_file.Execute(kRequestId));
+}
+
 TEST_F(FileSystemProviderOperationsCreateFileTest, OnSuccess) {
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   util::StatusCallbackLog callback_log;
 
   CreateFile create_file(NULL,
                          file_system_info_,
                          base::FilePath::FromUTF8Unsafe(kFilePath),
                          base::Bind(&util::LogStatusCallback, &callback_log));
   create_file.SetDispatchEventImplForTesting(
       base::Bind(&util::LoggingDispatchEventImpl::OnDispatchEventImpl,
@@ skipping 25 matching lines @@
   create_file.OnError(kRequestId,
                       scoped_ptr<RequestValue>(new RequestValue()),
                       base::File::FILE_ERROR_TOO_MANY_OPENED);
   ASSERT_EQ(1u, callback_log.size());
   EXPECT_EQ(base::File::FILE_ERROR_TOO_MANY_OPENED, callback_log[0]);
 }
 
 }  // namespace operations
 }  // namespace file_system_provider
 }  // namespace chromeos