Useful links about Git:

If you see this error message:

Permission denied (publickey)
fatal : Could not read from remote repository

Please make sure you have the correct access rights
and the repository exists

You are probably trying to download/clone/pull from a repository using an address that looks like<username>/<repo>.git. If you just want the read-only access to the repo (not committing any changes back), you can simply change the address to<username>/<repo>.git. And you are done. :relaxed:

However, if you want to be a collaborator and get the read & write access to the repo, you have to use the<username>/<repo>.git address. (Certain CMSSW tools might force you to use it even if you don’t need the read & write access). In this case, you have to follow the instructions here:

In particular, make sure you register in github your ssh key. It means that you must do the following:

  1. Create a GitHub account.
  2. Generate a SSH key.
    • Typically it’s saved as ~/.ssh/id_rsa
  3. Associate the SSH key to your GitHub account.
  4. Activate the SSH key every time you connect to GitHub.
    • On Linux, call eval "$(ssh-agent -s)" followed by ssh-add ~/.ssh/id_rsa