shell_pull_release

tag_release=$(curl -s https://{user}:{key}@api.github.com/repos/{org}/{repo}/releases/latest | grep -Po '"tag_name":.*?[^\\]",' | perl -pe 's/"tag_name"://; s/"//; s/",$//' | xargs)


have_an_update() {

    if [ ! -f "$version_file" ]
        then
            return 0
    fi

    if [ "$(<${version_file})" != "${tag_release}" ]
        then
            return 0
    fi

    return 1
}

mark_update()
{
    echo $tag_release > ${version_file}
}


# If don't have an update, exit
if ! have_an_update
    then
        echo 'No updates to be applied'
        exit
fi


// download_code, do some other stuff, switch symlinks or rsync or whatever

mark_update