Git: How to ignore a file from one repo and add it to another?

Question

I have a Ruby on Rails application that I am trying to host on Heroku. I would also like to use a GitHub public (free) repository to track changes. I need to check-in a file con

Answer 1

What you could do is to add to the GitHub repo a smudge script (filter driver) which will:

• test for the existing of a private branch
• checkout the the password file from that branch

Since that private branch would only exist on the Heroku repo, the smudge script wouldn't do anything on the GitHub repo side.
But once pushed to the Heroku side, if a hook is checkouting a working directory on he Heroku server, then that same filter driver will kicks in and generate the sensitive file.

That being said, it is best for such a sensitive file to never be versioned in any Git repo, but rather being stored elsewhere.
The smudge script, rather than testing some Git repo content (like a private branch) would then test for an external repo (a ssh ftp, a Nexus repo, any other data referential out there where you choosed to stored those private informations), extract the right content and generate the file.