Merge pull request #11864 from taosdata/feature/ZhiqiangWang/fix-15126-add-taosd---help-feature

feature(shell): add taosd --help feature.

source/dnode/mgmt/exe/dmMain.c

@@ -17,11 +17,21 @@
 #include "dmImp.h"
 #include "tconfig.h"
 
+#define DM_APOLLO_URL    "The apollo string to use when configuring the server, such as: -a 'jsonFile:./tests/cfg.json', cfg.json text can be '{\"fqdn\":\"td1\"}'."
+#define DM_CFG_DIR       "Configuration directory."
+#define DM_DMP_CFG       "Dump configuration."
+#define DM_ENV_CMD       "The env cmd variable string to use when configuring the server, such as: -e 'TAOS_FQDN=td1'."
+#define DM_ENV_FILE      "The env variable file path to use when configuring the server, default is './.env', .env text can be 'TAOS_FQDN=td1'."
+#define DM_NODE_TYPE     "Startup type of the node, default is 0."
+#define DM_MACHINE_CODE  "Get machine code."
+#define DM_VERSION       "Print program version."
+#define DM_EMAIL         "<support@taosdata.com>"
 static struct {
   bool         dumpConfig;
   bool         generateGrant;
   bool         printAuth;
   bool         printVersion;
+  bool         printHelp;
   char         envFile[PATH_MAX];
   char         apolloUrl[PATH_MAX];
   const char **envCmd;
@@ -91,6 +101,8 @@ static int32_t dmParseArgs(int32_t argc, char const *argv[]) {
     } else if (strcmp(argv[i], "-e") == 0) {
       global.envCmd[cmdEnvIndex] = argv[++i];
       cmdEnvIndex++;
+    } else if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0 || strcmp(argv[i], "--usage") == 0 || strcmp(argv[i], "-?")) {
+      global.printHelp = true;
     } else {
     }
   }
@@ -111,6 +123,21 @@ static void dmPrintVersion() {
   printf("buildInfo: %s\n", buildinfo);
 }
 
+static void dmPrintHelp() {
+  char indent[] = "  ";
+  printf("Usage: taosd [OPTION...] \n\n");
+  printf("%s%s%s%s\n", indent, "-a,", indent, DM_APOLLO_URL);
+  printf("%s%s%s%s\n", indent, "-c,", indent, DM_CFG_DIR);
+  printf("%s%s%s%s\n", indent, "-C,", indent, DM_DMP_CFG);
+  printf("%s%s%s%s\n", indent, "-e,", indent, DM_ENV_CMD);
+  printf("%s%s%s%s\n", indent, "-E,", indent, DM_ENV_FILE);
+  printf("%s%s%s%s\n", indent, "-n,", indent, DM_NODE_TYPE);
+  printf("%s%s%s%s\n", indent, "-k,", indent, DM_MACHINE_CODE);
+  printf("%s%s%s%s\n", indent, "-V,", indent, DM_VERSION);
+
+  printf("\n\nReport bugs to %s.\n", DM_EMAIL);
+}
+
 static void dmDumpCfg() {
   SConfig *pCfg = taosGetCfg();
   cfgDumpCfg(pCfg, 0, true);
@@ -197,6 +224,12 @@ int main(int argc, char const *argv[]) {
     return 0;
   }
 
+  if (global.printHelp) {
+    dmPrintHelp();
+    taosCleanupArgs();
+    return 0;
+  }
+
   if (global.printVersion) {
     dmPrintVersion();
     taosCleanupArgs();