support dumping whole subdir from gh pages

src/ebusd/main.cpp

@@ -263,7 +263,7 @@ int main(int argc, char* argv[], char* envp[]) {
   if (configPath.find("://") == string::npos) {
     configLocalPrefix = s_opt.configPath;
   } else {
-    if (!s_opt.scanConfig) {
+    if (!s_opt.scanConfig && s_opt.dumpConfig == OF_NONE) {
       logWrite(lf_main, ll_error, "invalid configpath without scanconfig");  // force logging on exit
       return EINVAL;
     }

src/ebusd/main_args.cpp

@@ -148,7 +148,7 @@ static const argDef argDefs[] = {
   {"configpath",     'c',      "PATH",     0, "Read CSV config files from PATH (local folder or HTTPS URL) ["
       CONFIG_PATH "]"},
   {"scanconfig",     's',      "ADDR", af_optional, "Pick CSV config files matching initial scan ADDR: "
-      "empty for broadcast ident message (default when configpath is not given), "
+      "empty for broadcast ident message (default when neither configpath nor dumpconfig is not given), "
       "\"none\" for no initial scan message, "
       "\"full\" for full scan, "
       "a single hex address to scan, or "
@@ -667,7 +667,7 @@ int parse_main_args(int argc, char* argv[], char* envp[], options_t *opt) {
     return ret;
   }
 
-  if (!opt->readOnly && !opt->scanConfigOrPathSet) {
+  if (!opt->readOnly && !opt->scanConfigOrPathSet && opt->dumpConfig == OF_NONE) {
     opt->scanConfig = true;
     opt->initialScan = BROADCAST;
   }

src/ebusd/scan.cpp

@@ -102,6 +102,13 @@ result_t ScanHelper::collectConfigFiles(const string& relPath, const string& pre
         }
         continue;
       }
+      if (name.back() == '/') {
+        // directory
+        if (dirs != nullptr) {
+          dirs->push_back(relPathWithSlash + name.substr(0, name.length() - 1));
+        }
+        continue;
+      }
       if (prefix.length() == 0 ? (!ignoreAddressPrefix || name.length() < 3 || name.find_first_of('.') != 2)
       : (name.length() >= prefix.length() && name.substr(0, prefix.length()) == prefix)) {
         files->push_back(relPathWithSlash + name);