fix: ensure common options (like --log-level) are consistent

include/dwarfs/logger.h

@@ -73,6 +73,8 @@ class logger {
 
   static level_type parse_level(std::string_view level);
 
+  static std::string all_level_names();
+
  private:
   std::string policy_name_; // TODO: const?
 };

include/dwarfs/tool.h

@@ -24,9 +24,14 @@
 #include <string>
 #include <string_view>
 
+#include <boost/program_options.hpp>
+
 namespace dwarfs {
 
 std::string
 tool_header(std::string_view tool_name, std::string_view extra_info = "");
 
+void add_common_options(boost::program_options::options_description& opts,
+                        std::string& log_level_str);
+
 } // namespace dwarfs

src/dwarfs/logger.cpp

@@ -65,6 +65,10 @@ logger::level_type logger::parse_level(std::string_view level) {
   DWARFS_THROW(runtime_error, fmt::format("invalid logger level: {}", level));
 }
 
+std::string logger::all_level_names() {
+  return "error, warn, info, verbose, debug, trace";
+}
+
 stream_logger::stream_logger(std::ostream& os, level_type threshold,
                              bool with_context)
     : os_(os)

src/dwarfs/tool.cpp

@@ -21,6 +21,7 @@
 
 #include <fmt/format.h>
 
+#include "dwarfs/logger.h"
 #include "dwarfs/tool.h"
 #include "dwarfs/version.h"
 
@@ -39,4 +40,19 @@ tool_header(std::string_view tool_name, std::string_view extra_info) {
       tool_name, PRJ_GIT_ID, extra_info, PRJ_BUILD_ID);
 }
 
+void add_common_options(boost::program_options::options_description& opts,
+                        std::string& log_level_str) {
+  auto log_level_desc = "log level (" + logger::all_level_names() + ")";
+
+  // clang-format off
+  opts.add_options()
+    ("log-level",
+        boost::program_options::value<std::string>(&log_level_str)
+            ->default_value("info"),
+        log_level_desc.c_str())
+    ("help,h",
+        "output help message and exit");
+  // clang-format on
+}
+
 } // namespace dwarfs

src/dwarfs_main.cpp

@@ -969,7 +969,7 @@ void usage(std::filesystem::path const& progname) {
       << "    -o readonly            show read-only file system\n"
       << "    -o (no_)cache_image    (don't) keep image in kernel cache\n"
       << "    -o (no_)cache_files    (don't) keep files in kernel cache\n"
-      << "    -o debuglevel=NAME     error, warn, info, debug, trace\n"
+      << "    -o debuglevel=NAME     " << logger::all_level_names() << "\n"
       << "    -o tidy_strategy=NAME  (none)|time|swap\n"
       << "    -o tidy_interval=TIME  interval for cache tidying (5m)\n"
       << "    -o tidy_max_age=TIME   tidy blocks after this time (10m)\n"

src/dwarfsck_main.cpp

@@ -83,11 +83,8 @@ int dwarfsck_main(int argc, sys_char** argv) {
     ("export-metadata",
         po::value<std::string>(&export_metadata),
         "export raw metadata as JSON to file")
-    ("log-level",
-        po::value<std::string>(&log_level)->default_value("info"),
-        "log level (error, warn, info, debug, trace)")
-    ("help,h",
-        "output help message and exit");
+      ;
+  add_common_options(opts, log_level);
   // clang-format on
 
   po::positional_options_description pos;

src/dwarfsextract_main.cpp

@@ -83,16 +83,13 @@ int dwarfsextract_main(int argc, sys_char** argv) {
     ("cache-size,s",
         po::value<std::string>(&cache_size_str)->default_value("512m"),
         "block cache size")
-    ("log-level,l",
-        po::value<std::string>(&log_level)->default_value("warn"),
-        "log level (error, warn, info, debug, trace)")
 #if DWARFS_PERFMON_ENABLED
     ("perfmon",
         po::value<std::string>(&perfmon_str),
         "enable performance monitor")
 #endif
-    ("help,h",
-        "output help message and exit");
+    ;
+  add_common_options(opts, log_level);
   // clang-format on
 
   po::variables_map vm;

src/mkdwarfs_main.cpp

@@ -333,11 +333,9 @@ int mkdwarfs_main(int argc, sys_char** argv) {
     ("compress-level,l",
         po::value<unsigned>(&level)->default_value(default_level),
         "compression level (0=fast, 9=best, please see man page for details)")
-    ("log-level",
-        po::value<std::string>(&log_level_str)->default_value("info"),
-        "log level (error, warn, info, verbose, debug, trace)")
-    ("help,h",
-        "output help message and exit")
+    ;
+  add_common_options(basic_opts, log_level_str);
+  basic_opts.add_options()
     ("long-help,H",
         "output full help message and exit")
     ;