gistfile1.clj

(ns cloud-monkey.env
  (:require [environ.core :as environ]))



(defonce env environ/env)

(defn merge-with-env! [a-map]
  (alter-var-root #'env (fn [x] (merge x a-map))))

... then in core.clj

(defn -main
  "Monkey run cloud, from Clojure"
  [& args]
  ;always use original config first
  ;try to load from OS config
  (let [config-original (try (slurp "/etc/cloud-monkey/config-original.clj")
                             (catch Exception e e))
        ;if not available, try to load from resources
        config-original (if (instance? Exception config-original)
                          (slurp (jio/resource "etc/cloudmonkey/config-original.clj"))
                          config-original)]
    (env/merge-with-env! (read-string config-original))))