Checks if staging area for git directories given through stdin is empty

git-check-empty-staging-area.sh

#!/bin/bash

# This script checks if the staging area for git directories in $1 is empty
while read line; do
    dir=$line
    curdir=$PWD
    cd $dir
    gitroot=`git rev-parse --show-toplevel`
    cd $gitroot
    # echo "Currently in git root $PWD"
    if [[ -z "$gitroot" ]]
    then
        echo "No git directory @ $dir!"
        cd $curdir
        exit 1
    fi
    # check if gitroot is empty here...
    changed=`git status -s | grep -v "^??"`
    if [[ -z "$changed" ]]
    then
        cd $curdir
    else
        cd $curdir
        printf "There are changed files in $dir:\n$changed"
        exit 1
    fi
done < "${1:-/dev/stdin}"