Running counsel-ag while automatically ignoring git submoules

ivy-ag.el

(defun jsm/projectile-counsel-ag ()
  "Run counsel-ag within projectile root while ignoring git submodule paths."
  (interactive)
  (let ((default-directory (projectile-project-root))
        (agignore-cmd "git config --file .gitmodules --get-regexp path | awk '{ print $2 }' > .agignore"))
    (shell-command agignore-cmd nil nil)
    (counsel-ag (thing-at-point 'symbol) (projectile-project-root))))

(define-key projectile-command-map (kbd "s s") 'jsm/projectile-counsel-ag)