Check if image:tag combination already exists on docker hub

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Update: Docker-Free solution see below

Using Docker

This is the solution I use with gitlab using the docker:stable image.

Login

docker login -u $USER -p $PASSWORD $REGISTRY

Check whether it’s there:

docker manifest inspect $IMGNAME:$IMGTAG > /dev/null ; echo $?

docker will return 0 on success or 1 on failure.

If you get a warning: Update Docker or enable experimental client-features:

Set the environment variable DOCKER_CLI_EXPERIMENTAL to enabled (See Matěj’s answer below)

Alternatively adjust the config (original answer):

echo '{"experimental": "enabled"}' > ~/.docker/config.json

This will also overwrite your config. If that is not an option you need to do that manually or use jq, sed or whatever you have available.

Testing without Docker

If you don’t have access to a docker-daemon you can give Skopeo or crane a try.

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