Erlang reltool utility functionality application

erlang, erlang-releases



Erlang reltool utility functionality application

ex2erl is an escript that converts Elixir source code to Erlang source code which is useful when relying only on Erlang compilation with Erlang source code that would like to include Elixir source code.

release is an escript which provides the same basic functionality as rebar generate, with additional error reporting coming from the reltool OTP source code which rebar suppresses.

scope is an escript which moves your Erlang application dependencies into their own "scope", so in Erlang, this means that it adds a prefix to the application name and all the modules used by the application. The general sequence of operations you would want to use with the scope script are:

  1. use the -r replace mode to modify internal source code,
  2. modify the internal source code manually, if necessary,
  3. run the scope script normally before compilation,
  4. if it is necessary to return the source back to the original state, use the -u undo mode to remove the scoped source code and replace it with the original source code. The scope script is meant to be part of a build process so the dependency modifications are automatic.

For the sequence above to work properly all dependencies must have a unique prefix in their file names (both erl and hrl files). If a file name is not unique (like log.hrl or protocol.hrl), unrelated source code may be modified to cause bugs.

Example arguments for normal operation are: -s cloudi_x_ -p cloudi -b _original -d directory1 -d directory2. Dependencies that use include_lib require that the dependency directory name is changed to have the scope, but the script can still add/remove the scope to the application and module names normally.

The reltool_util source code provides a simple way to start an Erlang application manually, outside of a release (which is useful when regression testing requires that an application be started, especially if the tests are part of a build process like rebar eunit or rebar ct).


Michael Truog (mjtruog at protonmail dot com)


  • Hans Bolinder (ex2erl utf8 encoding)


MIT License