Basic jq w/ dynamic keys example with kubectl

_.sh

# want to decode the output of the `kubectl get secret secname` command
# and specifically the `auth` value
# when we maybe don't know the value of the key corresponding to a container registry
# {
#  "auths": {
#    "https://index.docker.io/v1/": {
#      "username": "smittywerbenjagermanjensen",
#      "password": "sup3rs3cr3t",
#      "email": "swjmjensen12345@example.com",
#      "auth": "c21pdHR5d2VyYmVuamFnZXJtYW5qZW5zZW46c3VwM3JzM2NyM3QK"
#    }
#  }
# }

kubectl get secret regcred \
--output="jsonpath={.data.\.dockerconfigjson}" \
| base64 --decode \
| jq '.auths \
| to_entries[] \
| select( .key | contains("http")).value.auth' \
| sed 's/"//g' \
| base64 --decode

# > smittywerbenjagermanjensen:sup3rs3cr3t