Bug Report: git add

(Apologies if there is a proper place to report bugs; but I could not find one.)

PROBLEM: "git add" adds sub-directories without checking to see if there
is already a git repository already there.

WHY BAD: This causes files to be in two repositories (leading to a mess if you don't notice for a while...)

ONE SOLUTION: When adding files from a directory (except root of the repository, of course) look for a .git subdirectory, and complain if found. Allow --force to override this.

MORE SOPHISTICATED:
 1. Offer to merge in all that history, followed by removing that old
.git subdirectory.

 2. Look inside the .git subdirectory to see if the file being added is
actually under control there. If not, no need to complain.

EXAMPLE OF PROBLEM

The problem can arise when people are just dipping their toe into git, and decide to try it on just one directory, then later expand its use to the whole project.

  mkdir test
  cd test

  mkdir settings
  cd settings
  git init
  touch x
  git add x
  git commit -m "xx"

  (time passes)

  cd ..
  git init
  git add settings/
   (should complain)

Thanks for taking the time to read this,

Darren