Git reset status for file marked as changed but with no content modification (mostly due to file permission change)

reset.sh

#!/usr/bin/env bash
set -e

git status --porcelain | (
    unset action
    while read line; do
        case "${line//[[:space:]]/}" in
        'UU'*) action='check' ;;
        'M'*) action='check' ;;
        'D'*) action='ignore' ;;
        '??'*) action='ignore' ;;
        'A'*) action='ignore' ;;
        'C'*) action='ignore' ;;
        'R'*) action='ignore' ;;
        esac

        if [ "${action}" == "ignore" ]; then
            echo " >> Ignoring : ${line}"
        else
            path=${line:2}
            PATH_NO_WHITESPACE="$(echo -e "${path}" | tr -d '[:space:]')"

            if git diff $PATH_NO_WHITESPACE | grep -B 2 @@ -q; then
                echo " >> Ignoring file     : $PATH_NO_WHITESPACE"
            else
                echo " << Checking out file : $PATH_NO_WHITESPACE"
                git checkout $path
            fi
        fi
    done
)