;; Store the Git revision of your Emacs configuration at the moment
;; Emacs started.

(defconst my/has-git-p (if (executable-find "git") t nil)
  "Indicates if git is in your PATH.")

(defun my/configuration-revision ()
  "Retrieve the current Git revision of the Emacs configuration."
  (when my/has-git-p
    (with-temp-buffer
      (cd user-emacs-directory)
      (when (eql 0 (call-process "git" nil (current-buffer) nil
                                 "describe" "--all" "--long" "--dirty"))
        (string-trim (buffer-string))))))

(defconst my/configuration-revision
  (my/configuration-revision)
  "Contains the Git revision of the configuration at the moment Emacs started.")