The problem with MySQL 5.7+ client libraries was that there was no way
to disable SSL usage from the sysbench command line, because the client
library defaults to MYSQL_OPT_SSL_MODE = SSL_MODE_REQUIRED, even if
--mysql-ssl is not used. So the only way to disable it was disabling SSL
on the server.
Now --mysql-ssl behaves like the --ssl-mode option in MySQL client
utilities. It accepts the following values (with "disabled" being the
default):
disabled, preferred, required, verify_ca, verify_identity.
When sysbench is built With pre-5.6 MySQL client libraries or MariaDB
client libraries, where support for SSL modes is not available,
--mysql-ssl behavior is not affected by this change, i.e. it remains a
boolean variable accepting the on/off values, with "off" being the
default.
Replace hard-coded values for client SSL path names with driver options,
at the same time making it possible to skip those options even when
--mysql-ssl is used.
Add '40001' (serialization_failure) to the list of ignored SQL states in
drv_pgsql.c. The error appears to be specific to CockroachDB, but
restarting the current transaction is the only reasonable way to handle
it.
The type of MYSQL_BIND::is_null has been changed from my_bool* to bool*
in MySQL 8.0. Since the size bool is not defined by the standard, we
either need to change the DB and Lua APIs to ensure is_null points to a
large enough buffer for MySQL API to store a bool, or do conversions
between sysbench and MySQL data structures. For now, just assert that
sizeof(bool) == 1, which is likely the case on all supported platforms.
