chore: add simple mkdwarfs fuzzer (wip)

CMakeLists.txt

@@ -597,7 +597,7 @@ endif()
 
 add_custom_target(symlinks ALL DEPENDS ${SYMLINKS})
 
-if(WITH_TESTS OR WITH_BENCHMARKS)
+if(WITH_TESTS OR WITH_BENCHMARKS OR WITH_FUZZ)
   add_library(test_helpers test/test_helpers.cpp test/test_iolayer.cpp
                            test/test_strings.cpp test/loremipsum.cpp
                            test/test_dirtree.cpp test/filter_test_data.cpp)
@@ -674,6 +674,10 @@ if(WITH_FUZZ)
   add_executable(fuzz_categorizers test/fuzz_categorizers.cpp)
   target_link_libraries(fuzz_categorizers "$<LINK_LIBRARY:WHOLE_ARCHIVE,dwarfs_categorizer>")
   list(APPEND BINARY_TARGETS fuzz_categorizers)
+
+  add_executable(fuzz_mkdwarfs test/fuzz_mkdwarfs.cpp)
+  target_link_libraries(fuzz_mkdwarfs mkdwarfs_main test_helpers)
+  list(APPEND BINARY_TARGETS fuzz_mkdwarfs)
 endif()
 
 if(WITH_MAN_PAGES)

test/fuzz_mkdwarfs.cpp

@@ -0,0 +1,63 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/**
+ * \author     Marcus Holland-Moritz (github@mhxnet.de)
+ * \copyright  Copyright (c) Marcus Holland-Moritz
+ *
+ * This file is part of dwarfs.
+ *
+ * dwarfs is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * dwarfs is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with dwarfs.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <filesystem>
+
+#include <folly/FileUtil.h>
+
+#include "dwarfs_tool_main.h"
+#include "test_helpers.h"
+
+using namespace dwarfs;
+
+int main(int argc, char** argv) {
+  if (argc < 2) {
+    return 1;
+  }
+
+  std::shared_ptr<test::os_access_mock> os{
+      test::os_access_mock::create_test_instance()};
+
+#ifdef __AFL_LOOP
+  while (__AFL_LOOP(10000))
+#endif
+  {
+    std::string cmdline;
+    if (!folly::readFile(argv[1], cmdline)) {
+      std::terminate();
+    }
+
+    std::shared_ptr<test::test_file_access> fa{
+        std::make_shared<test::test_file_access>()};
+    std::unique_ptr<test::test_iolayer> iol{
+        std::make_unique<test::test_iolayer>(os, fa)};
+
+    auto args = test::parse_args(cmdline);
+    args.insert(args.begin(), "mkdwarfs");
+
+    try {
+      mkdwarfs_main(args, iol->get());
+    } catch (const std::exception&) {
+    }
+  }
+
+  return 0;
+}