Add placeholder functions for "repmgr $command --help"

There are now too many options to sensibly fit into general --help
output; we'll add separate output for each repmgr command, e.g.
"repmgr node --help".

repmgr-action-bdr.c

@@ -414,3 +414,12 @@ do_bdr_unregister(void)
 
 	return;
 }
+
+
+void
+do_bdr_help(void)
+{
+	print_help_header();
+
+
+}

repmgr-action-bdr.h

@@ -9,5 +9,7 @@
 extern void do_bdr_register(void);
 extern void do_bdr_unregister(void);
 
+extern void do_bdr_help(void);
+
 
 #endif /* _REPMGR_ACTION_BDR_H_ */

repmgr-action-cluster.c

@@ -1083,3 +1083,12 @@ cube_set_node_status(t_node_status_cube **cube, int n, int execute_node_id, int
 		}
 	}
 }
+
+
+void
+do_cluster_help(void)
+{
+	print_help_header();
+
+
+}

repmgr-action-cluster.h

@@ -35,5 +35,6 @@ extern void do_cluster_event(void);
 extern void do_cluster_crosscheck(void);
 extern void do_cluster_matrix(void);
 
+extern void do_cluster_help(void);
 
 #endif

repmgr-action-node.c

@@ -1249,11 +1249,7 @@ do_node_check_downstream(PGconn *conn, OutputMode mode, CheckStatusList *list_ou
 	return status;
 }
 
-// --action=...
-// --check
-// --list -> list what would be executed for each action, filter to --action
 
-// --checkpoint must be run as superuser - check connection
 void
 do_node_service(void)
 {
@@ -1967,3 +1963,12 @@ copy_file(const char *src_file, const char *dest_file)
 
 	return true;
 }
+
+
+void
+do_node_help(void)
+{
+	print_help_header();
+
+
+}

repmgr-action-node.h

@@ -13,6 +13,6 @@ extern void do_node_check(void);
 extern void do_node_rejoin(void);
 extern void do_node_service(void);
 
-
+extern void do_node_help(void);
 
 #endif /* _REPMGR_ACTION_NODE_H_ */

repmgr-action-primary.c

@@ -489,3 +489,13 @@ do_primary_unregister(void)
 	PQfinish(primary_conn);
 	return;
 }
+
+
+
+void
+do_primary_help(void)
+{
+	print_help_header();
+
+
+}

repmgr-action-primary.h

@@ -9,4 +9,5 @@
 extern void do_primary_register(void);
 extern void do_primary_unregister(void);
 
+extern void do_primary_help(void);
 #endif

repmgr-action-standby.c

@@ -4065,3 +4065,12 @@ parse_node_check_replication_lag(const char *node_check_output, int *seconds, in
 
 	return status;
 }
+
+
+void
+do_standby_help(void)
+{
+	print_help_header();
+
+
+}

repmgr-action-standby.h

@@ -13,6 +13,8 @@ extern void do_standby_promote(void);
 extern void do_standby_follow(void);
 extern void do_standby_switchover(void);
 
+extern void do_standby_help(void);
+
 extern bool do_standby_follow_internal(PGconn *primary_conn, t_node_info *primary_node_record, PQExpBufferData *output);
 
 

repmgr-client-global.h

@@ -197,6 +197,7 @@ extern void get_superuser_connection(PGconn **conn, PGconn **superuser_conn, PGc
 extern bool remote_command(const char *host, const char *user, const char *command, PQExpBufferData *outputbuf);
 
 extern void make_remote_repmgr_path(PQExpBufferData *outputbuf, t_node_info *remote_node_record);
+extern void print_help_header(void);
 
 /* server control functions */
 extern void get_server_action(t_server_action action, char *script, char *data_dir);

repmgr-client.c

@@ -84,12 +84,14 @@ main(int argc, char **argv)
 	int			optindex;
 	int			c;
 
-	char	   *repmgr_node_type = NULL;
+	char	   *repmgr_command = NULL;
 	char	   *repmgr_action = NULL;
-	bool		valid_repmgr_node_type_found = true;
+	bool		valid_repmgr_command_found = true;
 	int			action = NO_ACTION;
 	char	   *dummy_action = "";
 
+	bool	    help_option = false;
+
 	set_progname(argv[0]);
 
 	/*
@@ -173,8 +175,10 @@ main(int argc, char **argv)
 			 * these are the only ones which can be executed as root user
 			 */
 			case OPT_HELP: /* --help */
-				do_help();
-				exit(SUCCESS);
+				help_option = true;
+				break;
+				//do_help();
+				//exit(SUCCESS);
 			case '?':
 				/* Actual help option given */
 				if (strcmp(argv[optind - 1], "-?") == 0)
@@ -646,7 +650,7 @@ main(int argc, char **argv)
 	 * We check this here to give the root user a chance to execute --help/--version
 	 * options.
 	 */
-	if (geteuid() == 0)
+	if (geteuid() == 0 && help_option == false)
 	{
 		fprintf(stderr,
 				_("%s: cannot be run as root\n"
@@ -679,7 +683,7 @@ main(int argc, char **argv)
 	 */
 	if (optind < argc)
 	{
-		repmgr_node_type = argv[optind++];
+		repmgr_command = argv[optind++];
 	}
 
 	if (optind < argc)
@@ -691,11 +695,17 @@ main(int argc, char **argv)
 		repmgr_action = dummy_action;
 	}
 
-	if (repmgr_node_type != NULL)
+	if (repmgr_command != NULL)
 	{
 #ifndef BDR_ONLY
-		if (strcasecmp(repmgr_node_type, "PRIMARY") == 0 || strcasecmp(repmgr_node_type, "MASTER") == 0 )
+		if (strcasecmp(repmgr_command, "PRIMARY") == 0 || strcasecmp(repmgr_command, "MASTER") == 0 )
 		{
+			if (help_option == true)
+			{
+				do_primary_help();
+				exit(SUCCESS);
+			}
+
 			if (strcasecmp(repmgr_action, "REGISTER") == 0)
 				action = PRIMARY_REGISTER;
 			else if (strcasecmp(repmgr_action, "UNREGISTER") == 0)
@@ -706,8 +716,14 @@ main(int argc, char **argv)
 				action = NODE_STATUS;
 		}
 
-		else if (strcasecmp(repmgr_node_type, "STANDBY") == 0)
+		else if (strcasecmp(repmgr_command, "STANDBY") == 0)
 		{
+			if (help_option == true)
+			{
+				do_standby_help();
+				exit(SUCCESS);
+			}
+
 			if (strcasecmp(repmgr_action, "CLONE") == 0)
 				action = STANDBY_CLONE;
 			else if (strcasecmp(repmgr_action, "REGISTER") == 0)
@@ -725,11 +741,17 @@ main(int argc, char **argv)
 			else if (strcasecmp(repmgr_action, "STATUS") == 0)
 				action = NODE_STATUS;
 		}
-		else if (strcasecmp(repmgr_node_type, "BDR") == 0)
+		else if (strcasecmp(repmgr_command, "BDR") == 0)
 #else
-		if (strcasecmp(repmgr_node_type, "BDR") == 0)
+		if (strcasecmp(repmgr_command, "BDR") == 0)
 #endif
 		{
+			if (help_option == true)
+			{
+				do_bdr_help();
+				exit(SUCCESS);
+			}
+
 			if (strcasecmp(repmgr_action, "REGISTER") == 0)
 				action = BDR_REGISTER;
 			else if (strcasecmp(repmgr_action, "UNREGISTER") == 0)
@@ -740,8 +762,14 @@ main(int argc, char **argv)
 				action = NODE_STATUS;
 		}
 
-		else if (strcasecmp(repmgr_node_type, "NODE") == 0)
+		else if (strcasecmp(repmgr_command, "NODE") == 0)
 		{
+			if (help_option == true)
+			{
+				do_node_help();
+				exit(SUCCESS);
+			}
+
 		    if (strcasecmp(repmgr_action, "CHECK") == 0)
 				action = NODE_CHECK;
 			else if (strcasecmp(repmgr_action, "STATUS") == 0)
@@ -752,8 +780,13 @@ main(int argc, char **argv)
 				action = NODE_SERVICE;
 		}
 
-		else if (strcasecmp(repmgr_node_type, "CLUSTER") == 0)
+		else if (strcasecmp(repmgr_command, "CLUSTER") == 0)
 		{
+			if (help_option == true)
+			{
+				do_cluster_help();
+				exit(SUCCESS);
+			}
 
 			if (strcasecmp(repmgr_action, "SHOW") == 0)
 				action = CLUSTER_SHOW;
@@ -769,37 +802,43 @@ main(int argc, char **argv)
 		}
 		else
 		{
-			valid_repmgr_node_type_found = false;
+			valid_repmgr_command_found = false;
 		}
 	}
 
+	if (help_option == true)
+	{
+		do_help();
+		exit(SUCCESS);
+	}
+
 	if (action == NO_ACTION)
 	{
 		PQExpBufferData command_error;
 		initPQExpBuffer(&command_error);
 
-		if (repmgr_node_type == NULL)
+		if (repmgr_command == NULL)
 		{
 			appendPQExpBuffer(&command_error,
 							  _("no repmgr command provided"));
 		}
-		else if (valid_repmgr_node_type_found == false && repmgr_action[0] == '\0')
+		else if (valid_repmgr_command_found == false && repmgr_action[0] == '\0')
 		{
 			appendPQExpBuffer(&command_error,
-							  _("unknown repmgr node type '%s'"),
-							  repmgr_node_type);
+							  _("unknown repmgr command '%s'"),
+							  repmgr_command);
 		}
 		else if (repmgr_action[0] == '\0')
 		{
 		   appendPQExpBuffer(&command_error,
-							 _("no action provided for node type '%s'"),
-							 repmgr_node_type);
+							 _("no action provided for command '%s'"),
+							 repmgr_command);
 		}
 		else
 		{
 			appendPQExpBuffer(&command_error,
 							  _("unknown repmgr action '%s %s'"),
-							  repmgr_node_type,
+							  repmgr_command,
 							  repmgr_action);
 		}
 
@@ -1565,8 +1604,8 @@ print_error_list(ItemList *error_list, int log_level)
 }
 
 
-static void
-do_help(void)
+void
+print_help_header(void)
 {
 	printf(_("%s: replication management tool for PostgreSQL\n"), progname());
 	puts("");
@@ -1579,6 +1618,12 @@ do_help(void)
 		printf(_("	**************************************************\n"));
 		puts("");
 	}
+}
+
+static void
+do_help(void)
+{
+	print_help_header();
 
 	printf(_("Usage:\n"));
 #ifndef BDR_ONLY
@@ -1591,6 +1636,10 @@ do_help(void)
 
 	puts("");
 
+	printf(_("  Execute \"%s {primary|standby|bdr|node|cluster} --help\" to see command-specific options\n"), progname());
+
+	puts("");
+
 	printf(_("General options:\n"));
 	printf(_("  -?, --help                          show this help, then exit\n"));
 	printf(_("  -V, --version                       output version information, then exit\n"));