When I created foo.cnf, I set the permissions to 777. Apparently world-writable config files are ignored:
~/Workspace/project_time/mysql () $ mysql --print-defaults -uroot -p<secret> new_database;
mysql: [Warning] World-writable config file '/Users/myself/Workspace/project_time/mysql/foo.cnf' is ignored.
mysql would have been started with the following arguments:
--i_am_a_dummy -uroot -p<secret> new_database
When I reset the permissions for foo.cnf to 755 and re-run the command, I get the following:
~/Workspace/project_time/mysql () $ chmod 755 foo.cnf
~/Workspace/project_time/mysql () $ mysql --print-defaults -uroot -p<secret> new_database;
mysql would have been started with the following arguments:
--skip_column_names --i_am_a_dummy -uroot -p<secret> new_database
And when I invoke the aforementioned SELECT statement in the CLI, it appears as expected:
mysql> select * from t1;
+------+------+------+
| 2001 | 1 | 1 |
| 2001 | 1 | 20 |
| 2001 | 1 | 30 |
| 2001 | 2 | 2 |
| 2001 | 2 | 23 |
| 2001 | 2 | 23 |
+------+------+------+
6 rows in set (0.00 sec)
EDIT: The warning is actually printed out even when not passing the --print-defaults flag, I just didn't notice it among the other output in the CLI. Since --print-defaults results in much less output on start-up, the warning was easier to notice.