* removed universal suppression of everything "Event Schedule" everywhere
* added suppressions in tests as needed
* moved events test to the events suite
* renamed -master.opt -> .opt
* added standard test header
* verified in the test that the error, indeed, was written into the log
* removed useless suppressions
* removed ER_EVENTS_NO_ACL, replaced with ER_OPTION_PREVENTS_STATEMENT
* fixed error message to say exactly what option disabled event scheduler
instead of "this or that or that, you figure it out"
* also fixed old message for SET event_scheduler=
(it was also non-translatable)
* changed to use sql_print_error() when an error is not sent to the user
* removed duplicate hard-coded error message
When the server is started with `--event-scheduler=ON` and with
`--skip-grant-tables` (or built as embedded server which has no grant
tables at all), the event scheduler *appears* to be enabled (`SELECT
@@global.event_scheduler` returns `'ON'`), but attempting to
manipulate it in any way returns a misleading error message:
"Cannot proceed, because event scheduler is disabled"
Possible solutions:
1. Fast-fail: fail immediately on startup if `EVENT_SCHEDULER` is set to
any value other than `DISABLED` when starting up without grant
tables, then prevent `SET GLOBAL event_scheduler` while running.
Problem: there are existing setup scripts and code which start with
this combination and assume it will not fail.
2. Warn and change value: if `EVENT_SCHEDULER` is set to any value
other than `DISABLED` when starting, print a warning and change it
immediately to `DISABLED`.
Advantage: The value of the `EVENT_SCHEDULER` system variable after
startup will be consistent with its functional unavailability.
3. Display a clear error: if `EVENT_SCHEDULER` is enabled, but grant
tables are not enabled, then ensure error messages clearly explain
the fact that the combination is not supported.
Advantage: The error message encountered by the end user when
attempting to manipulate the event scheduler (such as `CREATE
EVENT`) is clear and explicit.
This commit implements the combination of solutions (2) and (3): it
will set `EVENT_SCHEDULER=DISABLED` on startup (reflecting the
functional reality) and it will print a startup warning, *and* it will
print a *distinct* error message each time that an end user attempts to
manipulate the event scheduler, so that the end user will clearly understand
the problem even if the startup messages are not visible at that point.
It also adds an MTR test `main.events_skip_grant_tables` to verify the
expected behavior, and the unmodified `main.events_restart` test
continues to demonstrate no change in the error message when the event
scheduler is non-functional for *different* reasons.
All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the BSD-new
license. I am contributing on behalf of my employer Amazon Web Services
Make two existing command line options "allow-suspicious-udfs" and
"skip-grant-tables" visible as global system variables.
Both options have security implications, but users were not able to check
their states in the server prior to this change. This was a security
issue, as the user may not be aware if the options are enabled. By adding
them into system variables, it increases users’ visibility into their
security configurations.
Create new MTR tests to verify that the system variables align with the
command line options. Minor adjustments to the existing MTR due to the new
members in system variables.
Before:
mysql> SHOW VARIABLES WHERE
Variable_Name LIKE 'allow_suspicious_udfs' OR
Variable_Name LIKE 'skip_grant_tables';
Empty set (0.000 sec)
After:
mysql> SHOW VARIABLES WHERE
Variable_Name LIKE 'allow_suspicious_udfs' OR
Variable_Name LIKE 'skip_grant_tables';
+-----------------------+-------+
| Variable_name | Value |
+-----------------------+-------+
| allow_suspicious_udfs | OFF |
| skip_grant_tables | OFF |
+-----------------------+-------+
All new code of the whole pull request, including one or several files
that are either new files or modified ones, are contributed under the
BSD-new license. I am contributing on behalf of my employer Amazon Web
Services, Inc.
After FLUSH PRIVILEGES remember if the connection started under
--skip-grant-tables and keep it all-powerful, not a lowly anonymous.
One could use this connection to reset passwords as needed.
Also fix a crash in SHOW CREATE USER
