Git pre-commit hook. Verify this repository has a clean work tree.

pre-commit

#!/bin/sh

# see also ...
# https://github.com/git/git/blob/master/git-sh-setup.sh#L168

# Verify this repository has a clean work tree.
# Return false (= 0), if there are any unstaged/ uncommitted changes.
# Return true (= 1), if there are no changes in the repository. 
has_clean_work_tree () {
  git rev-parse --quiet --verify HEAD &> /dev/null || return 0 # false
  git update-index --quiet --ignore-submodules --refresh

  if ! git diff-files --quiet --ignore-submodules
  then
    return 0 # false
  fi

  if ! git diff-index --cached --quiet --ignore-submodules HEAD --
  then
    return 0 # false
  fi

  return 1 # true
}


has_clean_work_tree
if [ "$?" == 0 ]; then
  # no clean work tree ...
  
fi