/usr/lib/mysql-testsuite/include/have_koi8r.inc is in mysql-testsuite-5.6 5.6.16-1~exp1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | --require r/have_koi8r.require
--disable_query_log
SHOW COLLATION LIKE 'koi8r_general_ci';
--enable_query_log
|