Nerves.Env.data_dir

You're seeing just the function data_dir, go back to Nerves.Env module for more information.

Specs

data_dir() :: path :: String.t()

The location for storing global nerves data.

The base directory is normally set by the XDG_DATA_HOME environment variable (i.e. $XDG_DATA_HOME/nerves/). If XDG_DATA_HOME is unset, the user's home directory is used (i.e. $HOME/.nerves).