[PBCKP-1238] Warning when using the community Version of pg_pro backup 2 for ENT

- Call check_version in add_instance subcmd to get correct error

src/backup.c

@@ -66,7 +66,6 @@ static bool pgpro_support(PGconn *conn);
 static bool pg_is_checksum_enabled(PGconn *conn);
 static bool pg_is_in_recovery(PGconn *conn);
 static bool pg_is_superuser(PGconn *conn);
-static void check_server_version(PGconn *conn, PGNodeInfo *nodeInfo);
 static void confirm_block_size(PGconn *conn, const char *name, int blcksz);
 static void rewind_and_mark_cfs_datafiles(parray *files, const char *root, char *relative, size_t i);
 static bool remove_excluded_files_criterion(void *value, void *exclude_args);
@@ -947,7 +946,7 @@ do_backup(InstanceState *instanceState, pgSetBackupParams *set_backup_params,
 /*
  * Confirm that this server version is supported
  */
-static void
+void
 check_server_version(PGconn *conn, PGNodeInfo *nodeInfo)
 {
 	PGresult   *res = NULL;

src/pg_probackup.c

@@ -980,7 +980,13 @@ main(int argc, char *argv[])
 						   wal_file_path, wal_file_name, batch_size, !no_validate_wal);
 			break;
 		case ADD_INSTANCE_CMD:
-			return do_add_instance(instanceState, &instance_config);
+			{
+				PGNodeInfo nodeInfo;
+				pgNodeInit(&nodeInfo);
+				instanceState->conn = pgut_connect(dbhost, dbport, dbname, dbuser);
+				check_server_version(instanceState->conn, &nodeInfo);
+				return do_add_instance(instanceState, &instance_config);
+			}
 		case DELETE_INSTANCE_CMD:
 			return do_delete_instance(instanceState);
 		case INIT_CMD:

src/pg_probackup.h

@@ -1225,6 +1225,7 @@ extern const char *base36enc_to(long unsigned int value, char buf[ARG_SIZE_HINT
 extern long unsigned int base36dec(const char *text);
 extern uint32 parse_server_version(const char *server_version_str);
 extern uint32 parse_program_version(const char *program_version);
+void check_server_version(PGconn *conn, PGNodeInfo *nodeInfo);
 extern bool   parse_page(Page page, XLogRecPtr *lsn);
 extern int32  do_compress(void* dst, size_t dst_size, void const* src, size_t src_size,
 						  CompressAlg alg, int level, const char **errormsg);