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

chrome/browser/chromeos/file_system_provider/operations/create_directory_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_directory.h"
 
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
@@ skipping 97 matching lines @@
       false /* exclusive */,
       true /* recursive */,
       base::Bind(&util::LogStatusCallback, &callback_log));
   create_directory.SetDispatchEventImplForTesting(
       base::Bind(&util::LoggingDispatchEventImpl::OnDispatchEventImpl,
                  base::Unretained(&dispatcher)));
 
   EXPECT_FALSE(create_directory.Execute(kRequestId));
 }
 
+TEST_F(FileSystemProviderOperationsCreateDirectoryTest, 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 */);
+
+  CreateDirectory create_directory(
+      NULL,
+      read_only_file_system_info,
+      base::FilePath::FromUTF8Unsafe(kDirectoryPath),
+      false /* exclusive */,
+      true /* recursive */,
+      base::Bind(&util::LogStatusCallback, &callback_log));
+  create_directory.SetDispatchEventImplForTesting(
+      base::Bind(&util::LoggingDispatchEventImpl::OnDispatchEventImpl,
+                 base::Unretained(&dispatcher)));
+
+  EXPECT_FALSE(create_directory.Execute(kRequestId));
+}
+
 TEST_F(FileSystemProviderOperationsCreateDirectoryTest, OnSuccess) {
   util::LoggingDispatchEventImpl dispatcher(true /* dispatch_reply */);
   util::StatusCallbackLog callback_log;
 
   CreateDirectory create_directory(
       NULL,
       file_system_info_,
       base::FilePath::FromUTF8Unsafe(kDirectoryPath),
       false /* exclusive */,
       true /* recursive */,
@@ skipping 31 matching lines @@
   create_directory.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