a simple script to simplify git hosting for personal usage.

git-shell.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-
import os
import re
import shlex
import sys
import subprocess



def main():
    command_line = os.environ.get('SSH_ORIGINAL_COMMAND')

    try:
        shell(command_line)
    except Exception as e:
        print('', file=sys.stderr)
        print(e, file=sys.stderr)
        print('', file=sys.stderr)

def shell(command_line):
    if not command_line:
        raise ValueError('No command line provided')

    args = shlex.split(command_line)
    command = args[0]

    repos_root = '/opt/git/repos'

    print(args, file=sys.stderr)

    if command in {'git-receive-pack', 'git-upload-pack', 'git-upload-archive'}:
        args[1] = re.sub(r'\/+', '/', '{}/{}.git'.format(repos_root, args[1].replace('.git', '')))

        print(args, file=sys.stderr)

        if not os.path.isdir(args[1]):
            init_git_repo(args[1])

        print(args, file=sys.stderr)

        os.execvp(command, args)

def init_git_repo(repo_dir):
    os.makedirs(repo_dir)
    p = subprocess.Popen('git init --bare', stdout=subprocess.PIPE,
                         stderr=subprocess.PIPE, cwd=repo_dir, shell=True)
    stdout, stderr = p.communicate()

if __name__ == '__main__':
    sys.exit(main())

add ssh public key to authorized_keys file, and make sure /path/to/git-shell.py is accessible to ssh user.

command="/usr/bin/python3 /path/to/git-shell.py",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty KEY_TYPE PUB_KEY