installpkg.sh LN# 151-179 Is there enough room in /tmp/

if [ "$PUPMODE" = "2" ]; then # from BK's quirky6.1 # LN# 151-179 of /usr/local/petget/installpkg.sh (tahpup) - http://www.pearltrees.com/s243a/installpkg-sh-usr-local-petget/id20402080/item224091068
    #131220  131229 detect if not enough room in /tmp...
    DIRECTSAVEPATH="/tmp/petget/directsavepath"
    SIZEB=`stat --format=%s "${DLPKG_PATH}"/${DLPKG_BASE}`
    SIZEK=`expr $SIZEB \/ 1024`
    EXPK=`expr $SIZEK \* 5` #estimated worst-case expanded size.
    NEEDK=$EXPK
    TMPK=`df -k /tmp | grep '^tmpfs' | tr -s ' ' | cut -f 4 -d ' '` #free space in /tmp
    if [ $EXPK -ge $TMPK ];then
      DIRECTSAVEPATH="/audit/directsavepath"
      NEEDK=`expr $NEEDK \* 2`
    fi
    if [ "$DIRECTSAVEPATH" ];then
     rm -rf $DIRECTSAVEPATH
     mkdir -p $DIRECTSAVEPATH
    fi
    # check enough space to install pkg...
    #as the pkg gets expanded to an intermediate dir, maybe in main f.s...
    PARTK=`df -k / | grep '/$' | tr -s ' ' | cut -f 4 -d ' '` #free space in partition.
    if [ $NEEDK -gt $PARTK ];then
     LANG=$LANG_USER
     if [ $DISPLAY ];then
      /usr/lib/gtkdialog/box_ok "$(gettext 'Puppy package manager')" error "$(gettext 'Not enough free space in the partition to install this package'):" "<i>${DLPKG_BASE}</i>"
     else
      echo -e "$(gettext 'Not enough free space in the partition to install this package'):\n${DLPKG_BASE}"
     fi
     [ "$DLPKG_PATH" != "" ] && rm -f "${DLPKG_PATH}"/${DLPKG_BASE}
     exit 1
    fi