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diff --git a/utils/fs/directory.hpp b/utils/fs/directory.hpp
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+// Copyright 2015 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file utils/fs/directory.hpp
+/// Provides the utils::fs::directory class.
+
+#if !defined(UTILS_FS_DIRECTORY_HPP)
+#define UTILS_FS_DIRECTORY_HPP
+
+#include "utils/fs/directory_fwd.hpp"
+
+#include <memory>
+#include <ostream>
+#include <string>
+
+#include "utils/fs/path_fwd.hpp"
+
+namespace utils {
+namespace fs {
+
+
+/// Representation of a single directory entry.
+struct directory_entry {
+    /// Name of the directory entry.
+    std::string name;
+
+    explicit directory_entry(const std::string&);
+
+    bool operator==(const directory_entry&) const;
+    bool operator!=(const directory_entry&) const;
+    bool operator<(const directory_entry&) const;
+};
+
+
+std::ostream& operator<<(std::ostream&, const directory_entry&);
+
+
+namespace detail {
+
+
+/// Forward directory iterator.
+class directory_iterator {
+    struct impl;
+
+    /// Internal implementation details.
+    std::shared_ptr< impl > _pimpl;
+
+    directory_iterator(std::shared_ptr< impl >);
+
+    friend class fs::directory;
+    static directory_iterator new_begin(const path&);
+    static directory_iterator new_end(void);
+
+public:
+    ~directory_iterator();
+
+    bool operator==(const directory_iterator&) const;
+    bool operator!=(const directory_iterator&) const;
+    directory_iterator& operator++(void);
+
+    const directory_entry& operator*(void) const;
+    const directory_entry* operator->(void) const;
+};
+
+
+}  // namespace detail
+
+
+/// Representation of a local filesystem directory.
+///
+/// This class is pretty much stateless.  All the directory manipulation
+/// operations happen within the iterator.
+class directory {
+public:
+    /// Public type for a constant forward directory iterator.
+    typedef detail::directory_iterator const_iterator;
+
+private:
+    struct impl;
+
+    /// Internal implementation details.
+    std::shared_ptr< impl > _pimpl;
+
+public:
+    explicit directory(const path&);
+
+    const_iterator begin(void) const;
+    const_iterator end(void) const;
+};
+
+
+}  // namespace fs
+}  // namespace utils
+
+#endif  // !defined(UTILS_FS_DIRECTORY_HPP)