diff --git a/src/main/cpp/workspace_layout.h b/src/main/cpp/workspace_layout.h
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+// Copyright 2016 The Bazel Authors. 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 BAZEL_SRC_MAIN_CPP_WORKSPACE_LAYOUT_H_
+#define BAZEL_SRC_MAIN_CPP_WORKSPACE_LAYOUT_H_
+
+#include <string>
+#include <vector>
+
+namespace blaze {
+
+using std::string;
+
+// Provides methods to compute paths related to the workspace.
+//
+// All methods in this class ought to be static because we reference them as
+// if they were global, and we do so from very early startup stages.
+//
+// The reason this is a class and not a namespace is because of historical
+// reasons, as this was split out from the BlazeStartupOptions class.
+// TODO(bazel-team): Reconsider dropping the class in favor of free functions.
+class WorkspaceLayout {
+ public:
+  WorkspaceLayout() = delete;
+
+  // Given the working directory, returns the nearest enclosing directory with a
+  // WORKSPACE file in it.  If there is no such enclosing directory, returns "".
+  //
+  // E.g., if there was a WORKSPACE file in foo/bar/build_root:
+  // GetWorkspace('foo/bar') --> ''
+  // GetWorkspace('foo/bar/build_root') --> 'foo/bar/build_root'
+  // GetWorkspace('foo/bar/build_root/biz') --> 'foo/bar/build_root'
+  //
+  // The returned path is relative or absolute depending on whether cwd was
+  // relative or absolute.
+  static string GetWorkspace(const string &cwd);
+
+  // Returns if workspace is a valid build workspace.
+  static bool InWorkspace(const string &workspace);
+
+  // Returns the basename for the rc file.
+  static string RcBasename();
+
+  // Returns the candidate pathnames for the RC files.
+  static void FindCandidateBlazercPaths(const string& workspace,
+                                        const string& cwd,
+                                        const std::vector<string>& args,
+                                        std::vector<string>* result);
+
+  // Returns the candidate pathnames for the RC file in the workspace,
+  // the first readable one of which will be chosen.
+  // It is ok if no usable candidate exists.
+  static void WorkspaceRcFileSearchPath(std::vector<string>* candidates);
+
+  // Turn a %workspace%-relative import into its true name in the filesystem.
+  // path_fragment is modified in place.
+  // Unlike WorkspaceRcFileSearchPath, it is an error if no import file exists.
+  static bool WorkspaceRelativizeRcFilePath(const string &workspace,
+                                            string *path_fragment);
+
+  static constexpr char WorkspacePrefix[] = "%workspace%/";
+  static const int WorkspacePrefixLength = sizeof WorkspacePrefix - 1;
+};
+
+}  // namespace blaze
+
+#endif  // BAZEL_SRC_MAIN_CPP_WORKSPACE_LAYOUT_H_