To know a Docker image exists with REST API

 Most of the time when it comes to docker, we play with using the CLI with 'docker' command. If we want to pull an image, tag an image, push an image we do all that with CLI only. However, apart from CLI, the docker repository supports varieties of REST API to do plenty of things and here I am planning to cover a few things like below

Manifest resource

The manifest rest resource can be used in a way how we want, for eg: if we want to know whether the image exists with a given tag then we can use the GET method of it

def checkAlreadyPresent(imageName, tag, bearerToken):
    auth_header = {'Authorization': ''}
    auth_header['Authorization'] = 'Bearer ' + bearerToken
    res = requests.get(
            url="https://docker.io/v2/" + imageName + "/manifests/" + tag,
            headers=auth_header)
    return res.status_code

You can also refer to

https://github.com/venkatesh-mohanram/continuous-learning/blob/master/docker/httpapiv2.md