Tag exists?

tag-exists.sh

#! /usr/bin/env bash

# USAGE:
# Replace your dockerhub credentials on DOCKER_HUB_USERNAME and DOCKER_HUB_PASSWORD
# Invoke from the directory you want to check against
#
# e.g. [/home/skycatch/core]$ ../tools/tag-exists.sh
#    > Tag exists: core/8d5b62
#
# Requires `jq` to be installed (brew install jq)

DOCKER_HUB_USERNAME=mydockerhub@user.com
DOCKER_HUB_PASSWORD=xxxxxpasswordxxxxx
DOCKER_TAG=$(git rev-parse --short HEAD)
DOCKER_REPO=$(basename $(pwd))
TOKEN=$( curl -sSLd "username=${DOCKER_HUB_USERNAME}&password=${DOCKER_HUB_PASSWORD}" https://hub.docker.com/v2/users/login | jq -r ".token" )
if (curl -sH "Authorization: JWT $TOKEN" "https://hub.docker.com/v2/repositories/skycatch/${DOCKER_REPO}/tags/?page_size=100" | jq -r '.results|.[]|.name' | grep ${DOCKER_TAG} )
then
    echo "Tag exists: ${DOCKER_REPO}/${DOCKER_TAG}"
else
    echo "Tag DOES NOT exist: ${DOCKER_REPO}/${DOCKER_TAG}"
fi