Processing reltool.config

Rebar processes the project's reltool.config, filling in important pieces of information if specified:

• the version {sys, ...}

  The version is processed as specified in Processing versions in configuration files

• overlay_vars

  If the configuration specifies an overlay_vars file, it will be loaded and the values defined there replace the ones in reltool.config. The overlay_vars file is loaded with file:consult/1 and should list the different values as separate expressions separated by full stops.

  A use-case where this is useful would be nice here.

• overlay

  ?