getify

/*
  NOTE: This code assumes a bare git repo in ./bare-git/,
  which should have at least one text file in its root,
  named "greetings.txt".
  
  This code updates the contents of a "greetings.txt"
  file, and creates a new file called "greetings-XXX.txt"
  (with XXX being a random number). It then creates a new
  commit for these changes. Finally, it reads and dumps
  the new current contents of the repo, file by file.