jq-examples

jq-key-map.sh

#!/usr/bin/env bash
#
# Adapted as a fix for https://github.com/spotify/backstage/blob/master/docker/run.sh
#
# Call with 

local key_map='{ "BACKEND_BASEURL": "backend_baseUrl" }'

config="$(jq --arg keyMap "$key_map" -n 'env |
  def swap_key($k): $keyMap | fromjson | if has($k) then with_entries(select(.key == $k)) | .[] else $k end;
  with_entries(select(.key | startswith("APP_CONFIG_")) | .key |= sub("APP_CONFIG_"; "")) |
  to_entries |
  reduce .[] as $item (
    {}; setpath(swap_key($item.key) | split("_"); $item.value | try fromjson catch $item.value)
  )')"

>&2 echo "Runtime app config: $config"