Check existence of known_hosts file

[ysono]

If the machine doing the compilation does not have a file at $HOME/.ssh/known_hosts, the compilation (repl or jar or uberjar) fails.

Right now I'm getting around the issue with below hack.

(defn touch [path]
  (with-open [writer (io/writer (io/file path)
                                :append true)]
    (spit writer "")))

(when-not (contains? (loaded-libs) 'clj-ssh.cli)
  (touch (str (System/getProperty "user.home") "/.ssh/known_hosts"))
  (load "/clj_ssh/cli")
  (alias 'my-alias 'clj-ssh.cli))

in lieu of (:require [clj-ssh.cli :as my-alias]).

No tests added, but I'm not sure how to add one without making it complicated with alter-root-var and proxy tricks.