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diff --git a/src/disk_interface.h b/src/disk_interface.h
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+// Copyright 2011 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef NINJA_DISK_INTERFACE_H_
+#define NINJA_DISK_INTERFACE_H_
+
+#include <string>
+
+/// Interface for accessing the disk.
+///
+/// Abstract so it can be mocked out for tests.  The real implementation
+/// is RealDiskInterface.
+struct DiskInterface {
+  virtual ~DiskInterface() {}
+
+  /// stat() a file, returning the mtime, or 0 if missing and -1 on
+  /// other errors.
+  virtual int Stat(const std::string& path) = 0;
+
+  /// Create a directory, returning false on failure.
+  virtual bool MakeDir(const std::string& path) = 0;
+
+  /// Read a file to a string.  Fill in |err| on error.
+  virtual std::string ReadFile(const std::string& path, std::string* err) = 0;
+
+  /// Remove the file named @a path. It behaves like 'rm -f path' so no errors
+  /// are reported if it does not exists.
+  /// @returns 0 if the file has been removed,
+  ///          1 if the file does not exist, and
+  ///          -1 if an error occurs.
+  virtual int RemoveFile(const std::string& path) = 0;
+
+  /// Create all the parent directories for path; like mkdir -p
+  /// `basename path`.
+  bool MakeDirs(const std::string& path);
+};
+
+#endif  // NINJA_DISK_INTERFACE_H_