Add --version and --help to ldb and sst_dump (#6951)

Summary:
as title
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6951

Test Plan: tests included + manual

Reviewed By: ajkr

Differential Revision: D21918540

Pulled By: pdillinger

fbshipit-source-id: 79d4991f2a831214fc7e477a839ec19dbbace6c5

include/rocksdb/sst_dump_tool.h

@@ -11,7 +11,7 @@ namespace ROCKSDB_NAMESPACE {
 
 class SSTDumpTool {
  public:
-  int Run(int argc, char** argv, Options options = Options());
+  int Run(int argc, char const* const* argv, Options options = Options());
 };
 
 }  // namespace ROCKSDB_NAMESPACE

include/rocksdb/utilities/ldb_cmd.h

@@ -78,7 +78,7 @@ class LDBCommand {
           SelectCommand);
 
   static LDBCommand* InitFromCmdLineArgs(
-      int argc, char** argv, const Options& options,
+      int argc, char const* const* argv, const Options& options,
       const LDBOptions& ldb_options,
       const std::vector<ColumnFamilyDescriptor>* column_families);
 
@@ -269,11 +269,13 @@ class LDBCommand {
 
 class LDBCommandRunner {
  public:
-  static void PrintHelp(const LDBOptions& ldb_options, const char* exec_name);
+  static void PrintHelp(const LDBOptions& ldb_options, const char* exec_name,
+                        bool to_stderr = true);
 
   // Returns the status code to return. 0 is no error.
   static int RunCommand(
-      int argc, char** argv, Options options, const LDBOptions& ldb_options,
+      int argc, char const* const* argv, Options options,
+      const LDBOptions& ldb_options,
       const std::vector<ColumnFamilyDescriptor>* column_families);
 };
 

tools/ldb_cmd.cc

@@ -97,7 +97,7 @@ void DumpSstFile(Options options, std::string filename, bool output_hex,
 };
 
 LDBCommand* LDBCommand::InitFromCmdLineArgs(
-    int argc, char** argv, const Options& options,
+    int argc, char const* const* argv, const Options& options,
     const LDBOptions& ldb_options,
     const std::vector<ColumnFamilyDescriptor>* column_families) {
   std::vector<std::string> args;

tools/ldb_cmd_test.cc

@@ -41,6 +41,18 @@ class LdbCmdTest : public testing::Test {
   std::shared_ptr<Env> env_guard_;
 };
 
+TEST_F(LdbCmdTest, HelpAndVersion) {
+  Options o;
+  o.env = TryLoadCustomOrDefaultEnv();
+  LDBOptions lo;
+  static const char* help[] = {"./ldb", "--help"};
+  ASSERT_EQ(0, LDBCommandRunner::RunCommand(2, help, o, lo, nullptr));
+  static const char* version[] = {"./ldb", "--version"};
+  ASSERT_EQ(0, LDBCommandRunner::RunCommand(2, version, o, lo, nullptr));
+  static const char* bad[] = {"./ldb", "--not_an_option"};
+  ASSERT_NE(0, LDBCommandRunner::RunCommand(2, bad, o, lo, nullptr));
+}
+
 TEST_F(LdbCmdTest, HexToString) {
   // map input to expected outputs.
   // odd number of "hex" half bytes doesn't make sense

tools/ldb_tool.cc

@@ -13,7 +13,7 @@ namespace ROCKSDB_NAMESPACE {
 LDBOptions::LDBOptions() {}
 
 void LDBCommandRunner::PrintHelp(const LDBOptions& ldb_options,
-                                 const char* /*exec_name*/) {
+                                 const char* /*exec_name*/, bool to_stderr) {
   std::string ret;
 
   ret.append(ldb_options.print_help_header);
@@ -99,22 +99,32 @@ void LDBCommandRunner::PrintHelp(const LDBOptions& ldb_options,
   WriteExternalSstFilesCommand::Help(ret);
   IngestExternalSstFilesCommand::Help(ret);
 
-  fprintf(stderr, "%s\n", ret.c_str());
+  fprintf(to_stderr ? stderr : stdout, "%s\n", ret.c_str());
 }
 
 int LDBCommandRunner::RunCommand(
-    int argc, char** argv, Options options, const LDBOptions& ldb_options,
+    int argc, char const* const* argv, Options options,
+    const LDBOptions& ldb_options,
     const std::vector<ColumnFamilyDescriptor>* column_families) {
   if (argc <= 2) {
-    PrintHelp(ldb_options, argv[0]);
+    if (std::string(argv[1]) == "--version") {
+      printf("ldb from RocksDB %d.%d.%d\n", ROCKSDB_MAJOR, ROCKSDB_MINOR,
+             ROCKSDB_PATCH);
+      return 0;
+    } else if (std::string(argv[1]) == "--help") {
+      PrintHelp(ldb_options, argv[0], /*to_stderr*/ false);
+      return 0;
+    } else {
+      PrintHelp(ldb_options, argv[0], /*to_stderr*/ true);
       return 1;
     }
+  }
 
   LDBCommand* cmdObj = LDBCommand::InitFromCmdLineArgs(
       argc, argv, options, ldb_options, column_families);
   if (cmdObj == nullptr) {
     fprintf(stderr, "Unknown command\n");
-    PrintHelp(ldb_options, argv[0]);
+    PrintHelp(ldb_options, argv[0], /*to_stderr*/ true);
     return 1;
   }
 

tools/sst_dump_test.cc

@@ -129,6 +129,20 @@ class SSTDumpToolTest : public testing::Test {
   }
 };
 
+TEST_F(SSTDumpToolTest, HelpAndVersion) {
+  Options opts;
+  opts.env = env();
+
+  ROCKSDB_NAMESPACE::SSTDumpTool tool;
+
+  static const char* help[] = {"./sst_dump", "--help"};
+  ASSERT_TRUE(!tool.Run(2, help, opts));
+  static const char* version[] = {"./sst_dump", "--version"};
+  ASSERT_TRUE(!tool.Run(2, version, opts));
+  static const char* bad[] = {"./sst_dump", "--not_an_option"};
+  ASSERT_TRUE(tool.Run(2, bad, opts));
+}
+
 TEST_F(SSTDumpToolTest, EmptyFilter) {
   Options opts;
   opts.env = env();

tools/sst_dump_tool.cc

@@ -481,9 +481,9 @@ Status SstFileDumper::ReadTableProperties(
 
 namespace {
 
-void print_help() {
+void print_help(bool to_stderr) {
   fprintf(
-      stderr,
+      to_stderr ? stderr : stdout,
       R"(sst_dump --file=<data_dir_OR_sst_file> [--command=check|scan|raw|recompress|identify]
     --file=<data_dir_OR_sst_file>
       Path to SST file or directory containing SST files
@@ -572,7 +572,7 @@ bool ParseIntArg(const char* arg, const std::string arg_name,
 }
 }  // namespace
 
-int SSTDumpTool::Run(int argc, char** argv, Options options) {
+int SSTDumpTool::Run(int argc, char const* const* argv, Options options) {
   const char* env_uri = nullptr;
   const char* dir_or_file = nullptr;
   uint64_t read_num = std::numeric_limits<uint64_t>::max();
@@ -696,10 +696,17 @@ int SSTDumpTool::Run(int argc, char** argv, Options options) {
                            "compression_level_to must be numeric", &tmp_val)) {
       has_compression_level_to = true;
       compress_level_to = static_cast<int>(tmp_val);
+    } else if (strcmp(argv[i], "--help") == 0) {
+      print_help(/*to_stderr*/ false);
+      return 0;
+    } else if (strcmp(argv[i], "--version") == 0) {
+      printf("sst_dump from RocksDB %d.%d.%d\n", ROCKSDB_MAJOR, ROCKSDB_MINOR,
+             ROCKSDB_PATCH);
+      return 0;
     } else {
       fprintf(stderr, "Unrecognized argument '%s'\n\n", argv[i]);
-      print_help();
+      print_help(/*to_stderr*/ true);
-      exit(1);
+      return 1;
     }
   }
 
@@ -730,7 +737,7 @@ int SSTDumpTool::Run(int argc, char** argv, Options options) {
 
   if (dir_or_file == nullptr) {
     fprintf(stderr, "file or directory must be specified.\n\n");
-    print_help();
+    print_help(/*to_stderr*/ true);
     exit(1);
   }