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mariadb/mysql-test/suite/sys_vars/t/log_error_func2.test
Guilhem Bichot 7bb4e5b459 Fix for BUG#51215 "log-error partially works with version 5.5": WL 4738 (reengineering of server variables)
had broken the 5.1 behaviour of --log-error: --log-error without argument sent to stderr instead of writing
to a file with an autogenerated name.

mysql-test/suite/sys_vars/t/log_error_func.test:
  test that error log is created and shown in SHOW VARIABLES.
  Interestingly the error log's path is apparently relative if --log-error=argument is used, but
  may be absolute or relative if --log-error(no argument) is used (because then the path is derived from
  that of pidfile_name, which can be absolute or relative, depending on if autogenerated or not).
mysql-test/suite/sys_vars/t/log_error_func2.test:
  test that error log is created and shown in SHOW VARIABLES
mysql-test/suite/sys_vars/t/log_error_func3.test:
  test that error log is empty in SHOW VARIABLES
sql/mysql_priv.h:
  id for option --log-error
sql/mysqld.cc:
  No --log-error means "write errors to stderr", whereas --log-error
  without argument means "write errors to a file". So we cannot use the default logic
  of class sys_var_charptr, which treats "option not used" the same as "option used
  without argument" and uses the same default for both. We need to catch "option used",
  in mysqld_get_one_option(), and then "without argument". Setting to "" makes sure
  that init_server_components() will create the log, with an autogenerated name.
sql/sys_vars.cc:
  need to give the option a numeric id so that we can catch it in mysqld_get_one_option()
2010-03-05 14:08:21 +01:00

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# Test for BUG#51215 "log-error partially works with version 5.5"
# when --log-error is used without argument
# check displayed value. We can check only the suffix, because
# the rest depends on paths, symbolic links, --vardir, etc...
select (@err_log:=variable_value)*0 from information_schema.global_variables where variable_name="log_error";
select instr(@err_log, ".err")>0;
# Check file's existence. The displayed value may be relative or not.
let $err_log=`select @err_log`;
let $err_log_relative=`select instr(@err_log, ".")=1`;
if ($err_log_relative)
{
let $MYSQLD_DATADIR= `SELECT @@datadir`;
file_exists $MYSQLD_DATADIR/$err_log;
}
if (!$err_log_relative)
{
file_exists $err_log;
}