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diff --git a/bootstrap/plain_helpers.cpp b/bootstrap/plain_helpers.cpp
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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.
+
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+
+#include "utils/defs.hpp"
+#include "utils/test_utils.ipp"
+
+
+namespace {
+
+
+/// Prints a fake but valid test case list and then aborts.
+///
+/// \param argv The original arguments of the program.
+///
+/// \return Nothing because this dies before returning.
+static int
+helper_abort_test_cases_list(int /* argc */, char** argv)
+{
+    for (const char* const* arg = argv; *arg != NULL; arg++) {
+        if (std::strcmp(*arg, "-l") == 0) {
+            std::cout << "Content-Type: application/X-atf-tp; "
+                "version=\"1\"\n\n";
+            std::cout << "ident: foo\n";
+        }
+    }
+    utils::abort_without_coredump();
+}
+
+
+/// Just returns without printing anything as the test case list.
+///
+/// \return Always 0, as required for test programs.
+static int
+helper_empty_test_cases_list(int /* argc */, char** /* argv */)
+{
+    return EXIT_SUCCESS;
+}
+
+
+/// Prints a correctly-formatted test case list but empty.
+///
+/// \param argv The original arguments of the program.
+///
+/// \return Always 0, as required for test programs.
+static int
+helper_zero_test_cases(int /* argc */, char** argv)
+{
+    for (const char* const* arg = argv; *arg != NULL; arg++) {
+        if (std::strcmp(*arg, "-l") == 0)
+            std::cout << "Content-Type: application/X-atf-tp; "
+                "version=\"1\"\n\n";
+    }
+    return EXIT_SUCCESS;
+}
+
+
+/// Mapping of the name of a helper to its implementation.
+struct helper {
+    /// The name of the helper, as will be provided by the user on the CLI.
+    const char* name;
+
+    /// A pointer to the function implementing the helper.
+    int (*hook)(int, char**);
+};
+
+
+/// NULL-terminated table mapping helper names to their implementations.
+static const helper helpers[] = {
+    { "abort_test_cases_list", helper_abort_test_cases_list, },
+    { "empty_test_cases_list", helper_empty_test_cases_list, },
+    { "zero_test_cases", helper_zero_test_cases, },
+    { NULL, NULL, },
+};
+
+
+}  // anonymous namespace
+
+
+/// Entry point to the ATF-less helpers.
+///
+/// The caller must select a helper to execute by defining the HELPER
+/// environment variable to the name of the desired helper.  Think of this main
+/// method as a subprogram dispatcher, to avoid having many individual helper
+/// binaries.
+///
+/// \todo Maybe we should really have individual helper binaries.  It would
+/// avoid a significant amount of complexity here and in the tests, at the
+/// expense of some extra files and extra build logic.
+///
+/// \param argc The user argument count; delegated to the helper.
+/// \param argv The user arguments; delegated to the helper.
+///
+/// \return The exit code of the helper, which depends on the requested helper.
+int
+main(int argc, char** argv)
+{
+    const char* command = std::getenv("HELPER");
+    if (command == NULL) {
+        std::cerr << "Usage error: HELPER must be set to a helper name\n";
+        std::exit(EXIT_FAILURE);
+    }
+
+    const struct helper* iter = helpers;
+    for (; iter->name != NULL && std::strcmp(iter->name, command) != 0; iter++)
+        ;
+    if (iter->name == NULL) {
+        std::cerr << "Usage error: unknown command " << command << "\n";
+        std::exit(EXIT_FAILURE);
+    }
+
+    return iter->hook(argc, argv);
+}