Naive script to check how many anonymous pulls from Docker hub remain / allowed from current IP

docker_pull_remains.sh

#!/usr/bin/env sh

for dep in curl jq grep awk; do
  if ! which ${dep} >&/dev/null; then
    echo >&2 "ERROR: required ${dep} binary is not found, exiting.."
    exit 1
  fi
done

TOKEN=$(
  curl \
    -sS \
    "https://auth.docker.io/token?service=registry.docker.io&scope=repository:ratelimitpreview/test:pull" \
      | jq -r .token
)

curl \
  --head \
  -H "Authorization: Bearer $TOKEN" \
  "https://registry-1.docker.io/v2/ratelimitpreview/test/manifests/latest" 2>&1 \
    | grep "^ratelimit-remaining" \
    | awk -F':| |;' '{print $3}'