
mysql already has its socket path hardcoded to to /run/mysqld/mysqld.sock. There's not much value in making the pidDir configurable, which also points to /run/mysqld by default. We only seem to use `services.mysql.pidDir` in the wordpress startup script, to wait for mysql to boot up, but we can also simply wait on the (hardcoded) socket location too. A much nicer way to accomplish that would be to properly describe a dependency on mysqld.service. This however is not easily doable, due to how the apache-httpd module was designed.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.