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April 21, 2023 16:46
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Example using argparse to build CLI resembling Docker
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| # docker ps | |
| # docker ps -a | |
| # docker ps --all | |
| # docker volume ls | |
| # docker volume ls -f dangling=true | |
| # docker volume ls -q | |
| import argparse | |
| parser = argparse.ArgumentParser() | |
| sub_parsers = parser.add_subparsers(dest='command') | |
| # docker start server | |
| # docker start server -i | |
| cmd_start = sub_parsers.add_parser('start') | |
| cmd_start.add_argument('-a', '--attach', action='store_true', help='Attach STDOUT/STDERR and forward signals') | |
| cmd_start.add_argument('--detach-keys', type=str, help='Override the key sequence for detaching a container') | |
| cmd_start.add_argument('-i', '--interactive', action='store_true', help='Attach container\'s STDIN') | |
| cmd_start.add_argument('container') | |
| # docker stop server | |
| # docker stop server -t 10 | |
| cmd_stop = sub_parsers.add_parser('stop') | |
| cmd_stop.add_argument('-t', '--time', type=int, help='Seconds to wait for stop before killing it (default 10)') | |
| cmd_stop.add_argument('container') | |
| # docker container ls | |
| # docker container ls -a | |
| cmd_container = sub_parsers.add_parser('container') | |
| cmd_container_sub_parser = cmd_container.add_subparsers(dest='sub_command') | |
| cmd_container__ls = cmd_container_sub_parser.add_parser('ls') | |
| cmd_container__ls.add_argument('-a', '--all', action='store_true', help='Show all containers (default shows just running)') | |
| cmd_container__ls.add_argument('-f', '--filter', help='Filter output based on conditions provided') | |
| # docker container logs | |
| # docker container logs -f | |
| cmd_container__logs = cmd_container_sub_parser.add_parser('logs') | |
| cmd_container__logs.add_argument('--details', help='Show extra details provided to logs') | |
| cmd_container__logs.add_argument('-f', '--follow', help='Follow log output') | |
| # Example: Consuming rest of the arguments | |
| # docker container exec server -- bash -c 'venv3/bin/python manage.py shell' | |
| # Namespace(command='container', sub_command='exec', container='server', args=['bash', '-c', 'ps']) | |
| cmd_container__exec = cmd_container_sub_parser.add_parser('exec') | |
| cmd_container__exec.add_argument('container') | |
| cmd_container__exec.add_argument('args', nargs='*') | |
| args = parser.parse_args() | |
| print(args) | |
| # python3 docker.py --help |
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