Get JWT token to access private repositories on hub.docker.com

docker-login.sh

function echoerr {
  echo "$@" 1>&2;
}

docker_username=${DOCKER_USER:-}
docker_password=${DOCKER_PASSWORD:-}

if [ -z "$docker_username" ]; then
  if command -v docker-credential-osxkeychain > /dev/null 2>&1; then
    readonly registry_url="https://index.docker.io/v1/"

    set +e
    credentials=$(echo $registry_url |docker-credential-osxkeychain get 2>/dev/null)
    ret_val=$?
    set -e

    if [ $ret_val -eq 0 ]; then
      docker_username=$(echo $credentials |jq -r ".Username")
      docker_password=$(echo $credentials |jq -r ".Secret")
    fi
  fi
fi

# This time if it's not set, we have to exit
if [ -z "$docker_username" ]; then
  echoerr "ERROR: Could not find valid docker credentials. Possible solutions:\n"
  echoerr "- If you're on Mac OS X, go to Docker -> Preferences and select 'Securely store Docker logins in macOS keychain'. Might need to run docker login again."
  echoerr "- Export \$DOCKER_USER and \$DOCKER_PASSWORD in your .bash_profile, .zshrc"
  exit 1
fi

readonly docker_token=$(curl -s -H "Content-Type: application/json" -XPOST -d '{"username": "'${docker_username}'", "password": "'${docker_password}'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)

This function lets you get JWT token to access private repositories on hub.docker.com. It expects that either:

• DOCKER_USER and DOCKER_PASSWORD are set; or
• On Mac, that docker uses osxkeychain credentials store

Dependencies:

• jq
• curl