updater.sh

#!/bin/sh

function _current_epoch() {
    echo $(($(date +%s) / 60 / 60 / 24))
}

function _update_osx_update() {
    echo 'LAST_EPOCH=$(_current_epoch)' > ~/.osx-bootstrap/.osx-update
}

function _upgrade_osx() {
    ~/.osx-bootstrap/.osx-bootstrap
}

epoch_target=$UPDATE_OSX_DAYS
if [[ -z $epoch_target ]]; then
    # Default to old behavior
    epoch_target=13
fi

if [ -f ~/.osx-bootstrap/.osx-update ]
then
    . ~/.osx-bootstrap/.osx-update

    if [[ -z $LAST_EPOCH ]]; then
        _update_osx_update && return 0;
    fi

    epoch_diff=$(($(_current_epoch) - $LAST_EPOCH))
    if [ $epoch_diff -gt $epoch_target ]
    then
        if [[ $DISABLE_UPDATE_PROMPT = 'true' ]]
        then
            _upgrade_osx
        else
            echo ''
            echo '##### OSX Bootstrap would like to check for updates?'
            echo 'Type Y/N to update:'
            read line
            if [ $line = Y ] || [ $line = y ]; then
                _upgrade_osx
            else
                _update_osx_update
            fi
        fi
    fi
else
    # create the update file
    _update_osx_update
fi