How to make private fork of public repository

Github prohibits making a private repository from a forked repository. This article explains how to create a private repository that can incorporate updates from a public repository, mimicking the behavior of a forked repository.

Bare Clone and Mirror Push

Duplicate public to private repository

1. Create empty private repo
2. Bare clone a public repo, and mirror push it to the private repo.

   $ git clone --bare https://github.com/exampleuser/public_repo.git
   $ cd public_repo.git
   $ git push --mirror https://github.com/yourname/private_repo.git
   $ cd ..
   $ rm -rf public-repo.git
   

Register remote repository with public repository

$ git clone https://github.com/yourname/private_repo.git
$ cd private_repo
$ git remote add public https://github.com/exampleuser/public_repo.git

Fetching from public repo

$ git pull public master 
$ git push origin master

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References

1. 0xjac/private_fork.md
2. https://stackoverflow.com/questions/10065526/github-how-to-make-a-fork-of-public-repository-private