The pool_passwd option [1] is specified relative to config file. But for greater flexibility absolute path should be accepted as well.
If pool_passwd option starts with /, let's treat it as absolute path. Otherwise, it is treated as relative path. Patch attached. Original author - Derek Kulinski [2]. In NixOS, configuration files often end up in world readable store, which is not the best place for storing password files. [1] http://www.pgpool.net/docs/latest/en/html/runtime-config-connection.html#GUC-POOL-PASSWD [2] https://github.com/NixOS/nixpkgs/pull/66224
