http://kotaku.com/popular-f...visible-c-1791536075

Цитаты из мана lauchctl

Due to bugs in the previous implementation and long-standing client expectations around those bugs, the load and unload subcommands will only return a non-zero exit code due to improper usage.

DEPRECATED AND REMOVED FUNCTIONALITY
While it was documented that $HOME/.launchd.conf would be consulted prior to setting up a user's session, this functionality was never implemented.

Наступил на прикольные грабли.

preinstall скрипт проверяет запущенность демона через

ps ax | grep -v grep | grep food

при этом сам preinstall запускается как

sh /tmp/.../com.bar.food.42/preinstall ...