Fixed bug #31077.

mysqldump adds the "-- Dump completed on YYYY-MM-DD hh:mm:ss" string
to the end of output if the --comments switch is on.
The only way to suppress this line is to use --skip-comments/--compact
switch.

New switch has been added to the mysqldump client command line:
--dump-date.

For the compatibility with previous releases, by default the --dump-date
is on.
The --dump-date switch forces mysqldump to add date to the
"-- Dump completed on ..." string at the end of output.
The --skip-dump-date switch supresses the output of date string
and uses short form of that commentary: "-- Dump completed".
--skip-comments or --compact switches disable the whole commentary
as usual.

client/client_priv.h

@@ -51,5 +51,5 @@ enum options_client
   OPT_TRIGGERS,
   OPT_IGNORE_TABLE,OPT_INSERT_IGNORE,OPT_SHOW_WARNINGS,OPT_DROP_DATABASE,
   OPT_TZ_UTC, OPT_AUTO_CLOSE, OPT_SSL_VERIFY_SERVER_CERT,
-  OPT_DEBUG_INFO, OPT_ERROR_LOG_FILE
+  OPT_DEBUG_INFO, OPT_ERROR_LOG_FILE, OPT_DUMP_DATE
 };

client/mysqldump.c

@@ -89,7 +89,7 @@ static my_bool  verbose= 0, opt_no_create_info= 0, opt_no_data= 0,
                 opt_drop=1,opt_keywords=0,opt_lock=1,opt_compress=0,
                 opt_delayed=0,create_options=1,opt_quoted=0,opt_databases=0,
                 opt_alldbs=0,opt_create_db=0,opt_lock_all_tables=0,
-                opt_set_charset=0,
+                opt_set_charset=0, opt_dump_date=1,
                 opt_autocommit=0,opt_disable_keys=1,opt_xml=0,
                 opt_delete_master_logs=0, tty_password=0,
                 opt_single_transaction=0, opt_comments= 0, opt_compact= 0,
@@ -402,6 +402,9 @@ static struct my_option my_long_options[] =
    "automatically turns off --lock-tables.",
    (gptr*) &opt_single_transaction, (gptr*) &opt_single_transaction, 0,
    GET_BOOL, NO_ARG,  0, 0, 0, 0, 0, 0},
+  {"dump-date", OPT_DUMP_DATE, "Put a dump date to the end of the output.",
+   (gptr*) &opt_dump_date, (gptr*) &opt_dump_date, 0,
+   GET_BOOL, NO_ARG, 1, 0, 0, 0, 0, 0},
   {"skip-opt", OPT_SKIP_OPTIMIZATION,
    "Disable --opt. Disables --add-drop-table, --add-locks, --create-options, --quick, --extended-insert, --lock-tables, --set-charset, and --disable-keys.",
    0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
@@ -622,12 +625,17 @@ static void write_footer(FILE *sql_file)
             "/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;\n");
     fputs("\n", sql_file);
     if (opt_comments)
+    {
+      if (opt_dump_date)
       {
         char time_str[20];
         get_date(time_str, GETDATE_DATE_TIME, 0);
         fprintf(sql_file, "-- Dump completed on %s\n",
                 time_str);
       }
+      else
+        fprintf(sql_file, "-- Dump completed");
+    }
     check_io(sql_file);
   }
 } /* write_footer */

mysql-test/r/mysqldump.result

@@ -3544,5 +3544,15 @@ c1
 2
 DROP TABLE t1,t2;
 #
+# Bug#29815: new option for suppressing last line of mysqldump:
+#            "Dump completed on"
+#
+# --skip-dump-date:
+-- Dump completed
+# --dump-date:
+-- Dump completed on -- ::
+# --dump-date (default):
+-- Dump completed on -- ::
+#
 # End of 5.0 tests
 #

mysql-test/t/mysqldump.test

@@ -1576,6 +1576,20 @@ SELECT * FROM t2;
 
 DROP TABLE t1,t2;
 
+--echo #
+--echo # Bug#29815: new option for suppressing last line of mysqldump:
+--echo #            "Dump completed on"
+--echo #
+
+--echo # --skip-dump-date:
+--exec $MYSQL_DUMP --skip-dump-date test | grep 'Dump completed'
+
+--echo # --dump-date:
+--exec $MYSQL_DUMP --dump-date test | grep 'Dump completed' | tr -d '[0-9]'
+
+--echo # --dump-date (default):
+--exec $MYSQL_DUMP test | grep 'Dump completed' | tr -d '[0-9]'
+
 --echo #
 --echo # End of 5.0 tests
 --echo #