#Modifying modules

A very common thing to do is modify an existing piece of code to do a new task or implement a new theory. For example, you might make add modified gravity or some other piece of new physics to a calculation module.

Steps

1. Create a new repository for your project using using the command

   #!bash
   ./cosmosis/tools/create-repository.py NAME_OF_PROJECT
   

Follow the instructions that appear

2. Copy the existing module into a subdirectory your new repository:

   #!bash
   cp -r cosmosis-standard-library/EXISTING_MODULE  modules/NAME_OF_PROJECT/NAME_OF_MODULE
   

3. Add the copied files to the repository:

   #!bash
   cd modules/NAME_OF_PROJECT/NAME_OF_MODULE
   make clean  # unless module is in python
   git add .
   git commit -m 'Initial commit of files for NAME_OF_PROJECT'
   

4. Make any modifications you want to the code. Then save the results:

   #!bash
   #  ... lots of work here ...
   git commit -am 'Made my changes'
   git push
   

You can now use your modified module by changing the path in the ini file to point to it.