#!/bin/bash
#
# check whether current directory is inside a git repository
#

is_git_repo() {
  git rev-parse --show-toplevel > /dev/null 2>&1
  result=$?
  if test $result != 0; then
    >&2 echo 'Not a git repo!'
    exit $result
  fi
}

is_git_repo

filename=$1
test -z $filename && echo "filename required." 1>&2 && exit 1
git update-index --skip-worktree $filename
