How to use GitPython to perform "git push" when using SSH Keys?

I am trying to write a Python Controller, which would help me automate Git -usage. I've gotten all other commands to work - but I am having difficulties with git push equivalent, when using GitPython Library.

This is where I am right now. This should be working without the SSH Key identification, but I have to squeeze that in.

""" Execute Git Push with GitPython Library.
Hardcoded values: 'branch' environment.
TODO: This is not working. """
def push(self, repo_path, branch, commit_message, user):
    repo = Repo(repo_path)
    repo.git.add('--all')
    repo.git.commit('-m', commit_message)
    origin = repo.remote(name=branch)
    origin.push()

This is what I have on my Initialization. (Cleared some values due to privacy.)

    load_dotenv()
    self.BRANCH = "TBD" # Hardcoded Value
    self.REPO_PATH = os.getenv('REPO_PATH')
    self.REPO = Repo(self.REPO_PATH)
    self.COMMIT_MESSAGE = '"Commit from Controller."'

    # TODO: These should be changed, when deployed.
    self.GIT_SSH_KEY = os.path.expanduser('/home/user/.ssh/id_rsa')
    self.GIT_SSH_CMD = "ssh -i %s" % self.GIT_SSH_KEY
    self.GIT_USER = "user" # This needs to be changed.

From my understanding from this (GitPython and SSH Keys?) the tactic here is to use GIT_SSH environment variable to provide executable, which will call the ssh - but since I am a beginner, I am having trouble understanding what exactly that environment variable should contain, and how to wrap that with the push function.

Thank you in advance!

Solution

First, setting values on self isn't going to accomplish anything by itself, unless there are parts of your code you're not showing us. If you need to set the GIT_SSH environment variable, then you would need to set os.environ['GIT_SSH'].

In general, you shouldn't need to set GIT_SSH unless you require a non-default ssh commandline. That is, if I have:

$ git remote -v
origin  ssh://git@github.com/larsks/gnu-hello (fetch)
origin  ssh://git@github.com/larsks/gnu-hello (push)

Then I can write:

>>> import git
>>> repo = git.Repo('.')
>>> origin = repo.remote('origin')
>>> res = origin.push()
>>> res[0].summary
'[up to date]\n'

I didn't have to set anything special here; the defaults were entirely appropriate. Under the hood, GitPython just calls the git command line, so anything that works with the cli should work fine without special configuration.