Comparison

Pros

• Gooey!

Cons

• no proper nesting of commands by designs
• deficiencies when it comes to POSIX compliant argument handling (Do we need this? Just added it to cover our bases)

Commands

arglib.py is the tool with only CLI functionality, arglib_gui.py runs the Gooey interface. The only difference between the two files is the @Gooey line before main.

CLI

The following commands are available

Pull an image from docker hub

python3 arglib.py pull <image>

Run an alpine hello world container

python3 arglib.py run hello

Run an alpine hello world container detached

python3 arglib.py run -d hello

Gooey

python3 arglib_gui.py

Setting up Environment

Virtual Environment

Create the environment in python 3

python3 -m venv env

Start the environment

source env/bin/activate

Docker SDK

pip install docker

Avoid having to use sudo with docker

Note: We will have to figure out how to easily add a user of the tool to the docker group. What if they don't have sudo access?

In your command line

Create the docker group

sudo groupadd docker

Add your user to docker group

sudo usermod -aG docker $USER

Quick reference on making a subparser for a subparser

Let's say you want to have the CLI have subcommands similar to docker image pull alpine. You can achieve that by creating a subparser of your subparser. I do not know the preferred way to do this but this was how I figured out how to make it. I'll use the image below as the standard.

So first you need to create your parent and regular subparser (the image and container)

parser = argparse.ArgumentParser()
subparser = parser.add_subparsers(dest='command')

image = subparser.add_parser('image')
container = subparser.add_parser('container')

Now if you want to add the pull option to the image command you can create an image subparser.

image_subparser = image.add_subparsers(dest='img_command')

pull = image_subparser.add_parser('pull')

You could then add an argument for pull by adding

pull.add_argument('image_name', type=str, required=True)

To call this, you would put presto image pull <image-name>

References

• https://realpython.com/command-line-interfaces-python-argparse/
• https://towardsdatascience.com/a-simple-guide-to-command-line-arguments-with-argparse-6824c30ab1c3
• https://docs.python.org/3/library/argparse.html
• https://docs.docker.com/engine/api/sdk/examples/
• https://docs.docker.com/engine/api/v1.41/
• https://docker-py.readthedocs.io/en/stable/