I have found at least two instances where the change to restrict mysqld from writing to dirs outside /var/tmp/mysql breaks automated build tests that spawn a mysqld instance to run tests.
Given that, we can either
a) Modify build tests to copy /usr/sbin/mysqld to the local build dir to run the tests
or
b) relax this requirement to allow /tmp access again
I have found at least two instances where the change to restrict mysqld from writing to dirs outside /var/tmp/mysql breaks automated build tests that spawn a mysqld instance to run tests.
Given that, we can either
a) Modify build tests to copy /usr/sbin/mysqld to the local build dir to run the tests
or
b) relax this requirement to allow /tmp access again