Pre-commit hook for git

pre-commit.sh

if git rev-parse --verify HEAD
then
  export against=HEAD
else
  # Initial commit: diff against an empty tree object
  export against=$(git hash-object -t tree /dev/null)
fi

files=$(git diff --name-only --diff-filter=ACTM $against)
for f in $files; do
  #check if file is a TF file
  if [ "grep -i \.tf '$f'" ]
  then
    #capture exit code from check 
    ret=`terraform fmt -check $f`
    if [ $ret ]
    then
      echo "Formatting Error:"
      exec terraform fmt -diff $f
    fi
  fi
done

                                                                  

Switched condition involving file extension check from a bash-specific test to something that isn't