fetch remote branch and rebase it. If working directory is dirty than stash them first and apply stash after update

git-update-from-remote.sh

# stashq is an alias to prevend auto-sign stashes (prompt for password):
# git config --global alias.stashq '-c commit.gpgsign=false stash'
function update-from-remote() {
  remote=${1:-"origin"}
  branch=${2:-"master"}

  if ! git remote | grep "${remote}" > /dev/null; then
    echo "There is no remote like ${remote}"
    return 1
  fi

  if ! git branch -r | grep "${remote}/${branch}$" > /dev/null; then
    echo "There is no remote branch like ${remote}/${branch}"
    return 1
  fi

  dirty=0

  [[ $(git diff-index HEAD 2> /dev/null | tail -n1) != "" ]] && dirty=1

  if [[ $dirty -eq 1 ]]; then git stashq; fi
  git fetch "${remote}" ${branch} && git rebase "${remote}/${branch}"
  if [[ $dirty -eq 1 ]]; then git stashq apply; fi
}