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diff --git a/utils/fs/exceptions.hpp b/utils/fs/exceptions.hpp
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+// Copyright 2010 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/exceptions.hpp
+/// Exception types raised by the fs module.
+
+#if !defined(UTILS_FS_EXCEPTIONS_HPP)
+#define UTILS_FS_EXCEPTIONS_HPP
+
+#include <stdexcept>
+#include <string>
+
+namespace utils {
+namespace fs {
+
+
+/// Base exception for fs errors.
+class error : public std::runtime_error {
+public:
+    explicit error(const std::string&);
+    virtual ~error(void) throw();
+};
+
+
+/// Error denoting an invalid path while constructing a fs::path object.
+class invalid_path_error : public error {
+    /// Raw value of the invalid path.
+    std::string _textual_path;
+
+public:
+    explicit invalid_path_error(const std::string&, const std::string&);
+    virtual ~invalid_path_error(void) throw();
+
+    const std::string& invalid_path(void) const;
+};
+
+
+/// Paths cannot be joined.
+class join_error : public error {
+    /// Raw value of the first path in the join operation.
+    std::string _textual_path1;
+
+    /// Raw value of the second path in the join operation.
+    std::string _textual_path2;
+
+public:
+    explicit join_error(const std::string&, const std::string&,
+                        const std::string&);
+    virtual ~join_error(void) throw();
+
+    const std::string& textual_path1(void) const;
+    const std::string& textual_path2(void) const;
+};
+
+
+/// Exceptions for errno-based errors.
+///
+/// TODO(jmmv): This code is duplicated in, at least, utils::process.  Figure
+/// out a way to reuse this exception while maintaining the correct inheritance
+/// (i.e. be able to keep it as a child of fs::error).
+class system_error : public error {
+    /// Error number describing this libc error condition.
+    int _original_errno;
+
+public:
+    explicit system_error(const std::string&, const int);
+    ~system_error(void) throw();
+
+    int original_errno(void) const throw();
+};
+
+
+/// Exception to denote an unsupported operation.
+class unsupported_operation_error : public error {
+public:
+    explicit unsupported_operation_error(const std::string&);
+    virtual ~unsupported_operation_error(void) throw();
+};
+
+
+}  // namespace fs
+}  // namespace utils
+
+
+#endif  // !defined(UTILS_FS_EXCEPTIONS_HPP)